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clang-format

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This commit is contained in:
Simon Gardling
2024-09-10 13:03:02 -04:00
parent 53c617d779
commit d66450e427
381 changed files with 28864 additions and 34170 deletions
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3
kern/arch/mips/include/current.h
View File

@@ -30,7 +30,6 @@
#ifndef _MIPS_CURRENT_H_
#define _MIPS_CURRENT_H_
/*
* Macro for current thread, or current cpu.
*
@@ -60,7 +59,7 @@
*/
#ifdef __GNUC__
register struct thread *curthread __asm("$23"); /* s7 register */
register struct thread *curthread __asm("$23"); /* s7 register */
#else
#error "Don't know how to declare curthread in this compiler"
#endif

30
kern/arch/mips/include/elf.h
View File

@@ -34,25 +34,23 @@
* MIPS machine-dependent definitions for the ELF binary format.
*/
/* The ELF executable type. */
#define EM_MACHINE EM_MIPS
#define EM_MACHINE EM_MIPS
/* Linker relocation codes. SIZE DESCRIPTION */
#define R_MIPS_NONE 0 /* --- nop */
#define R_MIPS_16 1 /* u16 value */
#define R_MIPS_32 2 /* u32 value */
#define R_MIPS_REL32 3 /* u32 value relative to patched address */
#define R_MIPS_26 4 /* u26 j/jal instruction address field */
#define R_MIPS_HI16 5 /* u16 %hi(sym) as below */
#define R_MIPS_LO16 6 /* s16 %lo(sym) as below */
#define R_MIPS_GPREL16 7 /* s16 offset from GP register */
#define R_MIPS_LITERAL 8 /* s16 GPREL16 for file-local symbols (?) */
#define R_MIPS_GOT16 9 /* u16 offset into global offset table */
#define R_MIPS_PC16 10 /* s16 PC-relative reference */
#define R_MIPS_CALL16 11 /* u16 call through global offset table */
#define R_MIPS_GPREL32 12 /* s32 offset from GP register */
#define R_MIPS_NONE 0 /* --- nop */
#define R_MIPS_16 1 /* u16 value */
#define R_MIPS_32 2 /* u32 value */
#define R_MIPS_REL32 3 /* u32 value relative to patched address */
#define R_MIPS_26 4 /* u26 j/jal instruction address field */
#define R_MIPS_HI16 5 /* u16 %hi(sym) as below */
#define R_MIPS_LO16 6 /* s16 %lo(sym) as below */
#define R_MIPS_GPREL16 7 /* s16 offset from GP register */
#define R_MIPS_LITERAL 8 /* s16 GPREL16 for file-local symbols (?) */
#define R_MIPS_GOT16 9 /* u16 offset into global offset table */
#define R_MIPS_PC16 10 /* s16 PC-relative reference */
#define R_MIPS_CALL16 11 /* u16 call through global offset table */
#define R_MIPS_GPREL32 12 /* s32 offset from GP register */
/* %hi/%lo are defined so %hi(sym) << 16 + %lo(sym) = sym */
#endif /* _MIPS_ELF_H_ */

66
kern/arch/mips/include/kern/regdefs.h
View File

@@ -36,39 +36,37 @@
#ifndef _KERN_MIPS_REGDEFS_H_
#define _KERN_MIPS_REGDEFS_H_
#define z0 $0 /* always zero register */
#define AT $1 /* assembler temp register */
#define v0 $2 /* value 0 */
#define v1 $3 /* value 1 */
#define a0 $4 /* argument 0 */
#define a1 $5 /* argument 1 */
#define a2 $6 /* argument 2 */
#define a3 $7 /* argument 3 */
#define t0 $8 /* temporary (caller-save) 0 */
#define t1 $9 /* temporary (caller-save) 1 */
#define t2 $10 /* temporary (caller-save) 2 */
#define t3 $11 /* temporary (caller-save) 3 */
#define t4 $12 /* temporary (caller-save) 4 */
#define t5 $13 /* temporary (caller-save) 5 */
#define t6 $14 /* temporary (caller-save) 6 */
#define t7 $15 /* temporary (caller-save) 7 */
#define s0 $16 /* saved (callee-save) 0 */
#define s1 $17 /* saved (callee-save) 1 */
#define s2 $18 /* saved (callee-save) 2 */
#define s3 $19 /* saved (callee-save) 3 */
#define s4 $20 /* saved (callee-save) 4 */
#define s5 $21 /* saved (callee-save) 5 */
#define s6 $22 /* saved (callee-save) 6 */
#define s7 $23 /* saved (callee-save) 7 */
#define t8 $24 /* temporary (caller-save) 8 */
#define t9 $25 /* temporary (caller-save) 9 */
#define k0 $26 /* kernel temporary 0 */
#define k1 $27 /* kernel temporary 1 */
#define gp $28 /* global pointer */
#define sp $29 /* stack pointer */
#define s8 $30 /* saved (callee-save) 8 = frame pointer */
#define ra $31 /* return address */
#define z0 $0 /* always zero register */
#define AT $1 /* assembler temp register */
#define v0 $2 /* value 0 */
#define v1 $3 /* value 1 */
#define a0 $4 /* argument 0 */
#define a1 $5 /* argument 1 */
#define a2 $6 /* argument 2 */
#define a3 $7 /* argument 3 */
#define t0 $8 /* temporary (caller-save) 0 */
#define t1 $9 /* temporary (caller-save) 1 */
#define t2 $10 /* temporary (caller-save) 2 */
#define t3 $11 /* temporary (caller-save) 3 */
#define t4 $12 /* temporary (caller-save) 4 */
#define t5 $13 /* temporary (caller-save) 5 */
#define t6 $14 /* temporary (caller-save) 6 */
#define t7 $15 /* temporary (caller-save) 7 */
#define s0 $16 /* saved (callee-save) 0 */
#define s1 $17 /* saved (callee-save) 1 */
#define s2 $18 /* saved (callee-save) 2 */
#define s3 $19 /* saved (callee-save) 3 */
#define s4 $20 /* saved (callee-save) 4 */
#define s5 $21 /* saved (callee-save) 5 */
#define s6 $22 /* saved (callee-save) 6 */
#define s7 $23 /* saved (callee-save) 7 */
#define t8 $24 /* temporary (caller-save) 8 */
#define t9 $25 /* temporary (caller-save) 9 */
#define k0 $26 /* kernel temporary 0 */
#define k1 $27 /* kernel temporary 1 */
#define gp $28 /* global pointer */
#define sp $29 /* stack pointer */
#define s8 $30 /* saved (callee-save) 8 = frame pointer */
#define ra $31 /* return address */
#endif /* _KERN_MIPS_REGDEFS_H_ */

3
kern/arch/mips/include/kern/setjmp.h
View File

@@ -38,10 +38,9 @@
* Must save: s0-s8, sp, ra (11 registers)
* Don't change __JB_REGS without adjusting mips_setjmp.S accordingly.
*/
#define __JB_REGS 11
#define __JB_REGS 11
/* A jmp_buf is an array of __JB_REGS registers */
typedef uint32_t jmp_buf[__JB_REGS];
#endif /* _MIPS_SETJMP_H_ */

3
kern/arch/mips/include/kern/signal.h
View File

@@ -27,7 +27,6 @@
* SUCH DAMAGE.
*/
#ifndef _KERN_MIPS_SIGNAL_H_
#define _KERN_MIPS_SIGNAL_H_
@@ -39,7 +38,7 @@
* probably won't.)
*/
struct sigcontext {
/* Dummy. */
/* Dummy. */
};
#endif /* _KERN_MIPS_SIGNAL_H_ */

36
kern/arch/mips/include/kern/types.h
View File

@@ -38,21 +38,20 @@
* See kern/types.h for an explanation of the underscores.
*/
/* Sized integer types, with convenient short names */
typedef char __i8; /* 8-bit signed integer */
typedef short __i16; /* 16-bit signed integer */
typedef int __i32; /* 32-bit signed integer */
typedef long long __i64; /* 64-bit signed integer */
typedef char __i8; /* 8-bit signed integer */
typedef short __i16; /* 16-bit signed integer */
typedef int __i32; /* 32-bit signed integer */
typedef long long __i64; /* 64-bit signed integer */
typedef unsigned char __u8; /* 8-bit unsigned integer */
typedef unsigned short __u16; /* 16-bit unsigned integer */
typedef unsigned int __u32; /* 32-bit unsigned integer */
typedef unsigned long long __u64; /* 64-bit unsigned integer */
typedef unsigned char __u8; /* 8-bit unsigned integer */
typedef unsigned short __u16; /* 16-bit unsigned integer */
typedef unsigned int __u32; /* 32-bit unsigned integer */
typedef unsigned long long __u64; /* 64-bit unsigned integer */
/* Further standard C types */
typedef long __intptr_t; /* Signed pointer-sized integer */
typedef unsigned long __uintptr_t; /* Unsigned pointer-sized integer */
typedef long __intptr_t; /* Signed pointer-sized integer */
typedef unsigned long __uintptr_t; /* Unsigned pointer-sized integer */
/*
* Since we're a 32-bit platform, size_t, ssize_t, and ptrdiff_t can
@@ -62,17 +61,16 @@ typedef unsigned long __uintptr_t; /* Unsigned pointer-sized integer */
* errors involving size_t, try changing this.
*/
#if 1
typedef unsigned __size_t; /* Size of a memory region */
typedef int __ssize_t; /* Signed type of same size */
typedef int __ptrdiff_t; /* Difference of two pointers */
typedef unsigned __size_t; /* Size of a memory region */
typedef int __ssize_t; /* Signed type of same size */
typedef int __ptrdiff_t; /* Difference of two pointers */
#else
typedef unsigned long __size_t; /* Size of a memory region */
typedef long __ssize_t; /* Signed type of same size */
typedef long __ptrdiff_t; /* Difference of two pointers */
typedef unsigned long __size_t; /* Size of a memory region */
typedef long __ssize_t; /* Signed type of same size */
typedef long __ptrdiff_t; /* Difference of two pointers */
#endif
/* Number of bits per byte. */
#define __CHAR_BIT 8
#define __CHAR_BIT 8
#endif /* _KERN_MIPS_TYPES_H_ */

20
kern/arch/mips/include/membar.h
View File

@@ -41,17 +41,14 @@
*/
MEMBAR_INLINE
void
membar_any_any(void)
{
__asm volatile(
".set push;" /* save assembler mode */
".set mips32;" /* allow MIPS32 instructions */
"sync;" /* do it */
".set pop" /* restore assembler mode */
: /* no outputs */
: /* no inputs */
: "memory"); /* "changes" memory */
void membar_any_any(void) {
__asm volatile(".set push;" /* save assembler mode */
".set mips32;" /* allow MIPS32 instructions */
"sync;" /* do it */
".set pop" /* restore assembler mode */
: /* no outputs */
: /* no inputs */
: "memory"); /* "changes" memory */
}
MEMBAR_INLINE void membar_load_load(void) { membar_any_any(); }
@@ -59,5 +56,4 @@ MEMBAR_INLINE void membar_store_store(void) { membar_any_any(); }
MEMBAR_INLINE void membar_store_any(void) { membar_any_any(); }
MEMBAR_INLINE void membar_any_store(void) { membar_any_any(); }
#endif /* _MIPS_MEMBAR_H_ */

86
kern/arch/mips/include/specialreg.h
View File

@@ -30,62 +30,61 @@
#ifndef _MIPS_SPECIALREG_H_
#define _MIPS_SPECIALREG_H_
/*
* Coprocessor 0 (system processor) register numbers
*/
#define c0_index $0 /* TLB entry index register */
#define c0_random $1 /* TLB random slot register */
#define c0_entrylo $2 /* TLB entry contents (low-order half) */
/* c0_entrylo0 $2 */ /* MIPS-II and up only */
/* c0_entrylo1 $3 */ /* MIPS-II and up only */
#define c0_context $4 /* some precomputed pagetable stuff */
/* c0_pagemask $5 */ /* MIPS-II and up only */
/* c0_wired $6 */ /* MIPS-II and up only */
#define c0_vaddr $8 /* virtual addr of failing memory access */
#define c0_count $9 /* cycle counter (MIPS-II and up) */
#define c0_entryhi $10 /* TLB entry contents (high-order half) */
#define c0_compare $11 /* on-chip timer control (MIPS-II and up) */
#define c0_status $12 /* processor status register */
#define c0_cause $13 /* exception cause register */
#define c0_epc $14 /* exception PC register */
#define c0_prid $15 /* processor ID register */
/* c0_config $16 */ /* MIPS-II and up only */
/* c0_lladdr $17 */ /* MIPS-II and up only */
/* c0_watchlo $18 */ /* MIPS-II and up only */
/* c0_watchhi $19 */ /* MIPS-II and up only */
#define c0_index $0 /* TLB entry index register */
#define c0_random $1 /* TLB random slot register */
#define c0_entrylo $2 /* TLB entry contents (low-order half) */
/* c0_entrylo0 $2 */ /* MIPS-II and up only */
/* c0_entrylo1 $3 */ /* MIPS-II and up only */
#define c0_context $4 /* some precomputed pagetable stuff */
/* c0_pagemask $5 */ /* MIPS-II and up only */
/* c0_wired $6 */ /* MIPS-II and up only */
#define c0_vaddr $8 /* virtual addr of failing memory access */
#define c0_count $9 /* cycle counter (MIPS-II and up) */
#define c0_entryhi $10 /* TLB entry contents (high-order half) */
#define c0_compare $11 /* on-chip timer control (MIPS-II and up) */
#define c0_status $12 /* processor status register */
#define c0_cause $13 /* exception cause register */
#define c0_epc $14 /* exception PC register */
#define c0_prid $15 /* processor ID register */
/* c0_config $16 */ /* MIPS-II and up only */
/* c0_lladdr $17 */ /* MIPS-II and up only */
/* c0_watchlo $18 */ /* MIPS-II and up only */
/* c0_watchhi $19 */ /* MIPS-II and up only */
/*
* Mode bits in c0_status
*/
#define CST_IEc 0x00000001 /* current: interrupt enable */
#define CST_KUc 0x00000002 /* current: user mode */
#define CST_IEp 0x00000004 /* previous: interrupt enable */
#define CST_KUp 0x00000008 /* previous: user mode */
#define CST_IEo 0x00000010 /* old: interrupt enable */
#define CST_KUo 0x00000020 /* old: user mode */
#define CST_IEc 0x00000001 /* current: interrupt enable */
#define CST_KUc 0x00000002 /* current: user mode */
#define CST_IEp 0x00000004 /* previous: interrupt enable */
#define CST_KUp 0x00000008 /* previous: user mode */
#define CST_IEo 0x00000010 /* old: interrupt enable */
#define CST_KUo 0x00000020 /* old: user mode */
#define CST_MODEMASK 0x0000003f /* mask for the above */
#define CST_IRQMASK 0x0000ff00 /* mask for the individual irq enable bits */
#define CST_BEV 0x00400000 /* bootstrap exception vectors flag */
#define CST_IRQMASK 0x0000ff00 /* mask for the individual irq enable bits */
#define CST_BEV 0x00400000 /* bootstrap exception vectors flag */
/*
* Fields of the c0_cause register
*/
#define CCA_UTLB 0x00000001 /* true if UTLB exception (set by our asm) */
#define CCA_CODE 0x0000003c /* EX_foo in trapframe.h */
#define CCA_IRQS 0x0000ff00 /* Currently pending interrupts */
#define CCA_COPN 0x30000000 /* Coprocessor number for EX_CPU */
#define CCA_JD 0x80000000 /* True if exception happened in jump delay */
#define CCA_UTLB 0x00000001 /* true if UTLB exception (set by our asm) */
#define CCA_CODE 0x0000003c /* EX_foo in trapframe.h */
#define CCA_IRQS 0x0000ff00 /* Currently pending interrupts */
#define CCA_COPN 0x30000000 /* Coprocessor number for EX_CPU */
#define CCA_JD 0x80000000 /* True if exception happened in jump delay */
#define CCA_CODESHIFT 2 /* shift for CCA_CODE field */
#define CCA_CODESHIFT 2 /* shift for CCA_CODE field */
/*
* Fields of the c0_index register
*/
#define CIN_P 0x80000000 /* nonzero -> TLB probe found nothing */
#define CIN_INDEX 0x00003f00 /* 6-bit index into TLB */
#define CIN_P 0x80000000 /* nonzero -> TLB probe found nothing */
#define CIN_INDEX 0x00003f00 /* 6-bit index into TLB */
#define CIN_INDEXSHIFT 8 /* shift for CIN_INDEX field */
#define CIN_INDEXSHIFT 8 /* shift for CIN_INDEX field */
/*
* Fields of the c0_context register
@@ -102,16 +101,15 @@
* there's no other good place in the chip to put it. See discussions
* elsewhere.
*/
#define CTX_VSHIFT 0x001ffffc /* shifted/masked copy of c0_vaddr */
#define CTX_PTBASE 0xffe00000 /* page table base address */
#define CTX_VSHIFT 0x001ffffc /* shifted/masked copy of c0_vaddr */
#define CTX_PTBASE 0xffe00000 /* page table base address */
#define CTX_PTBASESHIFT 21 /* shift for CTX_PBASE field */
#define CTX_PTBASESHIFT 21 /* shift for CTX_PBASE field */
/*
* Hardwired exception handler addresses.
*/
#define EXADDR_UTLB 0x80000000
#define EXADDR_GENERAL 0x80000080
#define EXADDR_UTLB 0x80000000
#define EXADDR_GENERAL 0x80000080
#endif /* _MIPS_SPECIALREG_H_ */

70
kern/arch/mips/include/spinlock.h
View File

@@ -32,12 +32,11 @@
#include <cdefs.h>
/* Type of value needed to actually spin on */
typedef unsigned spinlock_data_t;
/* Initializer for use by SPINLOCK_INITIALIZER */
#define SPINLOCK_DATA_INITIALIZER 0
#define SPINLOCK_DATA_INITIALIZER 0
/* Atomic operations on spinlock_data_t */
SPINLOCK_INLINE
@@ -55,10 +54,8 @@ spinlock_data_t spinlock_data_testandset(volatile spinlock_data_t *sd);
* memory.
*/
SPINLOCK_INLINE
void
spinlock_data_set(volatile spinlock_data_t *sd, unsigned val)
{
*sd = val;
void spinlock_data_set(volatile spinlock_data_t *sd, unsigned val) {
*sd = val;
}
/*
@@ -66,11 +63,7 @@ spinlock_data_set(volatile spinlock_data_t *sd, unsigned val)
* instruction, and instructions are atomic with respect to memory.
*/
SPINLOCK_INLINE
spinlock_data_t
spinlock_data_get(volatile spinlock_data_t *sd)
{
return *sd;
}
spinlock_data_t spinlock_data_get(volatile spinlock_data_t *sd) { return *sd; }
/*
* Test-and-set a spinlock_data_t. Use the LL/SC instructions to
@@ -86,37 +79,34 @@ spinlock_data_get(volatile spinlock_data_t *sd)
* to atomically update one machine word.
*/
SPINLOCK_INLINE
spinlock_data_t
spinlock_data_testandset(volatile spinlock_data_t *sd)
{
spinlock_data_t x;
spinlock_data_t y;
spinlock_data_t spinlock_data_testandset(volatile spinlock_data_t *sd) {
spinlock_data_t x;
spinlock_data_t y;
/*
* Test-and-set using LL/SC.
*
* Load the existing value into X, and use Y to store 1.
* After the SC, Y contains 1 if the store succeeded,
* 0 if it failed.
*
* On failure, return 1 to pretend that the spinlock
* was already held.
*/
/*
* Test-and-set using LL/SC.
*
* Load the existing value into X, and use Y to store 1.
* After the SC, Y contains 1 if the store succeeded,
* 0 if it failed.
*
* On failure, return 1 to pretend that the spinlock
* was already held.
*/
y = 1;
__asm volatile(
".set push;" /* save assembler mode */
".set mips32;" /* allow MIPS32 instructions */
".set volatile;" /* avoid unwanted optimization */
"ll %0, 0(%2);" /* x = *sd */
"sc %1, 0(%2);" /* *sd = y; y = success? */
".set pop" /* restore assembler mode */
: "=&r" (x), "+r" (y) : "r" (sd));
if (y == 0) {
return 1;
}
return x;
y = 1;
__asm volatile(".set push;" /* save assembler mode */
".set mips32;" /* allow MIPS32 instructions */
".set volatile;" /* avoid unwanted optimization */
"ll %0, 0(%2);" /* x = *sd */
"sc %1, 0(%2);" /* *sd = y; y = success? */
".set pop" /* restore assembler mode */
: "=&r"(x), "+r"(y)
: "r"(sd));
if (y == 0) {
return 1;
}
return x;
}
#endif /* _MIPS_SPINLOCK_H_ */

6
kern/arch/mips/include/thread.h
View File

@@ -30,7 +30,6 @@
#ifndef _MIPS_THREAD_H_
#define _MIPS_THREAD_H_
/*
* Machine-dependent thread bits.
*/
@@ -40,9 +39,8 @@
typedef void (*badfaultfunc_t)(void);
struct thread_machdep {
badfaultfunc_t tm_badfaultfunc; /* fault hook used by copyin/out */
jmp_buf tm_copyjmp; /* longjmp area used by copyin/out */
badfaultfunc_t tm_badfaultfunc; /* fault hook used by copyin/out */
jmp_buf tm_copyjmp; /* longjmp area used by copyin/out */
};
#endif /* _MIPS_THREAD_H_ */

15
kern/arch/mips/include/tlb.h
View File

@@ -77,14 +77,14 @@ int tlb_probe(uint32_t entryhi, uint32_t entrylo);
*/
/* Fields in the high-order word */
#define TLBHI_VPAGE 0xfffff000
#define TLBHI_VPAGE 0xfffff000
/* TLBHI_PID 0x00000fc0 */
/* Fields in the low-order word */
#define TLBLO_PPAGE 0xfffff000
#define TLBLO_PPAGE 0xfffff000
#define TLBLO_NOCACHE 0x00000800
#define TLBLO_DIRTY 0x00000400
#define TLBLO_VALID 0x00000200
#define TLBLO_DIRTY 0x00000400
#define TLBLO_VALID 0x00000200
/* TLBLO_GLOBAL 0x00000100 */
/*
@@ -92,14 +92,13 @@ int tlb_probe(uint32_t entryhi, uint32_t entrylo);
* be passed to TLBHI_INVALID; this prevents loading the same invalid
* entry into multiple TLB slots.
*/
#define TLBHI_INVALID(entryno) ((0x80000+(entryno))<<12)
#define TLBLO_INVALID() (0)
#define TLBHI_INVALID(entryno) ((0x80000 + (entryno)) << 12)
#define TLBLO_INVALID() (0)
/*
* Number of TLB entries in the processor.
*/
#define NUM_TLB 64
#define NUM_TLB 64
#endif /* _MIPS_TLB_H_ */

97
kern/arch/mips/include/trapframe.h
View File

@@ -38,59 +38,59 @@
*/
struct trapframe {
uint32_t tf_vaddr; /* coprocessor 0 vaddr register */
uint32_t tf_status; /* coprocessor 0 status register */
uint32_t tf_cause; /* coprocessor 0 cause register */
uint32_t tf_lo;
uint32_t tf_hi;
uint32_t tf_ra; /* Saved register 31 */
uint32_t tf_at; /* Saved register 1 (AT) */
uint32_t tf_v0; /* Saved register 2 (v0) */
uint32_t tf_v1; /* etc. */
uint32_t tf_a0;
uint32_t tf_a1;
uint32_t tf_a2;
uint32_t tf_a3;
uint32_t tf_t0;
uint32_t tf_t1;
uint32_t tf_t2;
uint32_t tf_t3;
uint32_t tf_t4;
uint32_t tf_t5;
uint32_t tf_t6;
uint32_t tf_t7;
uint32_t tf_s0;
uint32_t tf_s1;
uint32_t tf_s2;
uint32_t tf_s3;
uint32_t tf_s4;
uint32_t tf_s5;
uint32_t tf_s6;
uint32_t tf_s7;
uint32_t tf_t8;
uint32_t tf_t9;
uint32_t tf_gp;
uint32_t tf_sp;
uint32_t tf_s8;
uint32_t tf_epc; /* coprocessor 0 epc register */
uint32_t tf_vaddr; /* coprocessor 0 vaddr register */
uint32_t tf_status; /* coprocessor 0 status register */
uint32_t tf_cause; /* coprocessor 0 cause register */
uint32_t tf_lo;
uint32_t tf_hi;
uint32_t tf_ra; /* Saved register 31 */
uint32_t tf_at; /* Saved register 1 (AT) */
uint32_t tf_v0; /* Saved register 2 (v0) */
uint32_t tf_v1; /* etc. */
uint32_t tf_a0;
uint32_t tf_a1;
uint32_t tf_a2;
uint32_t tf_a3;
uint32_t tf_t0;
uint32_t tf_t1;
uint32_t tf_t2;
uint32_t tf_t3;
uint32_t tf_t4;
uint32_t tf_t5;
uint32_t tf_t6;
uint32_t tf_t7;
uint32_t tf_s0;
uint32_t tf_s1;
uint32_t tf_s2;
uint32_t tf_s3;
uint32_t tf_s4;
uint32_t tf_s5;
uint32_t tf_s6;
uint32_t tf_s7;
uint32_t tf_t8;
uint32_t tf_t9;
uint32_t tf_gp;
uint32_t tf_sp;
uint32_t tf_s8;
uint32_t tf_epc; /* coprocessor 0 epc register */
};
/*
* MIPS exception codes.
*/
#define EX_IRQ 0 /* Interrupt */
#define EX_MOD 1 /* TLB Modify (write to read-only page) */
#define EX_TLBL 2 /* TLB miss on load */
#define EX_TLBS 3 /* TLB miss on store */
#define EX_ADEL 4 /* Address error on load */
#define EX_ADES 5 /* Address error on store */
#define EX_IBE 6 /* Bus error on instruction fetch */
#define EX_DBE 7 /* Bus error on data load *or* store */
#define EX_SYS 8 /* Syscall */
#define EX_BP 9 /* Breakpoint */
#define EX_RI 10 /* Reserved (illegal) instruction */
#define EX_CPU 11 /* Coprocessor unusable */
#define EX_OVF 12 /* Arithmetic overflow */
#define EX_IRQ 0 /* Interrupt */
#define EX_MOD 1 /* TLB Modify (write to read-only page) */
#define EX_TLBL 2 /* TLB miss on load */
#define EX_TLBS 3 /* TLB miss on store */
#define EX_ADEL 4 /* Address error on load */
#define EX_ADES 5 /* Address error on store */
#define EX_IBE 6 /* Bus error on instruction fetch */
#define EX_DBE 7 /* Bus error on data load *or* store */
#define EX_SYS 8 /* Syscall */
#define EX_BP 9 /* Breakpoint */
#define EX_RI 10 /* Reserved (illegal) instruction */
#define EX_CPU 11 /* Coprocessor unusable */
#define EX_OVF 12 /* Arithmetic overflow */
/*
* Function to enter user mode. Does not return. The trapframe must
@@ -104,5 +104,4 @@ __DEAD void mips_usermode(struct trapframe *tf);
extern vaddr_t cpustacks[];
extern vaddr_t cputhreads[];
#endif /* _MIPS_TRAPFRAME_H_ */

28
kern/arch/mips/include/vm.h
View File

@@ -30,13 +30,12 @@
#ifndef _MIPS_VM_H_
#define _MIPS_VM_H_
/*
* Machine-dependent VM system definitions.
*/
#define PAGE_SIZE 4096 /* size of VM page */
#define PAGE_FRAME 0xfffff000 /* mask for getting page number from addr */
#define PAGE_SIZE 4096 /* size of VM page */
#define PAGE_FRAME 0xfffff000 /* mask for getting page number from addr */
/*
* MIPS-I hardwired memory layout:
@@ -48,10 +47,10 @@
* (mips32 is a little different)
*/
#define MIPS_KUSEG 0x00000000
#define MIPS_KSEG0 0x80000000
#define MIPS_KSEG1 0xa0000000
#define MIPS_KSEG2 0xc0000000
#define MIPS_KUSEG 0x00000000
#define MIPS_KSEG0 0x80000000
#define MIPS_KSEG1 0xa0000000
#define MIPS_KSEG2 0xc0000000
/*
* The first 512 megs of physical space can be addressed in both kseg0 and
@@ -65,13 +64,13 @@
* exception handler code) when converted to a vaddr it's *not* NULL, *is*
* a valid address, and will make a *huge* mess if you scribble on it.
*/
#define PADDR_TO_KVADDR(paddr) ((paddr)+MIPS_KSEG0)
#define PADDR_TO_KVADDR(paddr) ((paddr) + MIPS_KSEG0)
/*
* The top of user space. (Actually, the address immediately above the
* last valid user address.)
*/
#define USERSPACETOP MIPS_KSEG0
#define USERSPACETOP MIPS_KSEG0
/*
* The starting value for the stack pointer at user level. Because
@@ -81,7 +80,7 @@
* We put the stack at the very top of user virtual memory because it
* grows downwards.
*/
#define USERSTACK USERSPACETOP
#define USERSTACK USERSPACETOP
/*
* Interface to the low-level module that looks after the amount of
@@ -117,13 +116,12 @@ paddr_t ram_getfirstfree(void);
*/
struct tlbshootdown {
/*
* Change this to what you need for your VM design.
*/
int ts_placeholder;
/*
* Change this to what you need for your VM design.
*/
int ts_placeholder;
};
#define TLBSHOOTDOWN_MAX 16
#endif /* _MIPS_VM_H_ */

577
kern/arch/mips/locore/trap.c
View File

@@ -40,81 +40,68 @@
#include <mainbus.h>
#include <syscall.h>
/* in exception-*.S */
extern __DEAD void asm_usermode(struct trapframe *tf);
/* called only from assembler, so not declared in a header */
void mips_trap(struct trapframe *tf);
/* Names for trap codes */
#define NTRAPCODES 13
static const char *const trapcodenames[NTRAPCODES] = {
"Interrupt",
"TLB modify trap",
"TLB miss on load",
"TLB miss on store",
"Address error on load",
"Address error on store",
"Bus error on code",
"Bus error on data",
"System call",
"Break instruction",
"Illegal instruction",
"Coprocessor unusable",
"Arithmetic overflow",
"Interrupt", "TLB modify trap", "TLB miss on load",
"TLB miss on store", "Address error on load", "Address error on store",
"Bus error on code", "Bus error on data", "System call",
"Break instruction", "Illegal instruction", "Coprocessor unusable",
"Arithmetic overflow",
};
/*
* Function called when user-level code hits a fatal fault.
*/
static
void
kill_curthread(vaddr_t epc, unsigned code, vaddr_t vaddr)
{
int sig = 0;
static void kill_curthread(vaddr_t epc, unsigned code, vaddr_t vaddr) {
int sig = 0;
KASSERT(code < NTRAPCODES);
switch (code) {
case EX_IRQ:
case EX_IBE:
case EX_DBE:
case EX_SYS:
/* should not be seen */
KASSERT(0);
sig = SIGABRT;
break;
case EX_MOD:
case EX_TLBL:
case EX_TLBS:
sig = SIGSEGV;
break;
case EX_ADEL:
case EX_ADES:
sig = SIGBUS;
break;
case EX_BP:
sig = SIGTRAP;
break;
case EX_RI:
sig = SIGILL;
break;
case EX_CPU:
sig = SIGSEGV;
break;
case EX_OVF:
sig = SIGFPE;
break;
}
KASSERT(code < NTRAPCODES);
switch (code) {
case EX_IRQ:
case EX_IBE:
case EX_DBE:
case EX_SYS:
/* should not be seen */
KASSERT(0);
sig = SIGABRT;
break;
case EX_MOD:
case EX_TLBL:
case EX_TLBS:
sig = SIGSEGV;
break;
case EX_ADEL:
case EX_ADES:
sig = SIGBUS;
break;
case EX_BP:
sig = SIGTRAP;
break;
case EX_RI:
sig = SIGILL;
break;
case EX_CPU:
sig = SIGSEGV;
break;
case EX_OVF:
sig = SIGFPE;
break;
}
/*
* You will probably want to change this.
*/
/*
* You will probably want to change this.
*/
kprintf("Fatal user mode trap %u sig %d (%s, epc 0x%x, vaddr 0x%x)\n",
code, sig, trapcodenames[code], epc, vaddr);
panic("I don't know how to handle this\n");
kprintf("Fatal user mode trap %u sig %d (%s, epc 0x%x, vaddr 0x%x)\n", code,
sig, trapcodenames[code], epc, vaddr);
panic("I don't know how to handle this\n");
}
/*
@@ -122,229 +109,223 @@ kill_curthread(vaddr_t epc, unsigned code, vaddr_t vaddr)
* This is called by the assembly-language exception handler once
* the trapframe has been set up.
*/
void
mips_trap(struct trapframe *tf)
{
uint32_t code;
/*bool isutlb; -- not used */
bool iskern;
int spl;
void mips_trap(struct trapframe *tf) {
uint32_t code;
/*bool isutlb; -- not used */
bool iskern;
int spl;
/* The trap frame is supposed to be 35 registers long. */
KASSERT(sizeof(struct trapframe)==(35*4));
/* The trap frame is supposed to be 35 registers long. */
KASSERT(sizeof(struct trapframe) == (35 * 4));
/*
* Extract the exception code info from the register fields.
*/
code = (tf->tf_cause & CCA_CODE) >> CCA_CODESHIFT;
/*isutlb = (tf->tf_cause & CCA_UTLB) != 0;*/
iskern = (tf->tf_status & CST_KUp) == 0;
/*
* Extract the exception code info from the register fields.
*/
code = (tf->tf_cause & CCA_CODE) >> CCA_CODESHIFT;
/*isutlb = (tf->tf_cause & CCA_UTLB) != 0;*/
iskern = (tf->tf_status & CST_KUp) == 0;
KASSERT(code < NTRAPCODES);
KASSERT(code < NTRAPCODES);
/* Make sure we haven't run off our stack */
if (curthread != NULL && curthread->t_stack != NULL) {
KASSERT((vaddr_t)tf > (vaddr_t)curthread->t_stack);
KASSERT((vaddr_t)tf < (vaddr_t)(curthread->t_stack
+ STACK_SIZE));
}
/* Make sure we haven't run off our stack */
if (curthread != NULL && curthread->t_stack != NULL) {
KASSERT((vaddr_t)tf > (vaddr_t)curthread->t_stack);
KASSERT((vaddr_t)tf < (vaddr_t)(curthread->t_stack + STACK_SIZE));
}
/* Interrupt? Call the interrupt handler and return. */
if (code == EX_IRQ) {
int old_in;
bool doadjust;
/* Interrupt? Call the interrupt handler and return. */
if (code == EX_IRQ) {
int old_in;
bool doadjust;
old_in = curthread->t_in_interrupt;
curthread->t_in_interrupt = 1;
old_in = curthread->t_in_interrupt;
curthread->t_in_interrupt = 1;
/*
* The processor has turned interrupts off; if the
* currently recorded interrupt state is interrupts on
* (spl of 0), adjust the recorded state to match, and
* restore after processing the interrupt.
*
* How can we get an interrupt if the recorded state
* is interrupts off? Well, as things currently stand
* when the CPU finishes idling it flips interrupts on
* and off to allow things to happen, but leaves
* curspl high while doing so.
*
* While we're here, assert that the interrupt
* handling code hasn't leaked a spinlock or an
* splhigh().
*/
/*
* The processor has turned interrupts off; if the
* currently recorded interrupt state is interrupts on
* (spl of 0), adjust the recorded state to match, and
* restore after processing the interrupt.
*
* How can we get an interrupt if the recorded state
* is interrupts off? Well, as things currently stand
* when the CPU finishes idling it flips interrupts on
* and off to allow things to happen, but leaves
* curspl high while doing so.
*
* While we're here, assert that the interrupt
* handling code hasn't leaked a spinlock or an
* splhigh().
*/
if (curthread->t_curspl == 0) {
KASSERT(curthread->t_curspl == 0);
KASSERT(curthread->t_iplhigh_count == 0);
curthread->t_curspl = IPL_HIGH;
curthread->t_iplhigh_count++;
doadjust = true;
}
else {
doadjust = false;
}
if (curthread->t_curspl == 0) {
KASSERT(curthread->t_curspl == 0);
KASSERT(curthread->t_iplhigh_count == 0);
curthread->t_curspl = IPL_HIGH;
curthread->t_iplhigh_count++;
doadjust = true;
} else {
doadjust = false;
}
mainbus_interrupt(tf);
mainbus_interrupt(tf);
if (doadjust) {
KASSERT(curthread->t_curspl == IPL_HIGH);
KASSERT(curthread->t_iplhigh_count == 1);
curthread->t_iplhigh_count--;
curthread->t_curspl = 0;
}
if (doadjust) {
KASSERT(curthread->t_curspl == IPL_HIGH);
KASSERT(curthread->t_iplhigh_count == 1);
curthread->t_iplhigh_count--;
curthread->t_curspl = 0;
}
curthread->t_in_interrupt = old_in;
goto done2;
}
curthread->t_in_interrupt = old_in;
goto done2;
}
/*
* The processor turned interrupts off when it took the trap.
*
* While we're in the kernel, and not actually handling an
* interrupt, restore the interrupt state to where it was in
* the previous context, which may be low (interrupts on).
*
* Do this by forcing splhigh(), which may do a redundant
* cpu_irqoff() but forces the stored MI interrupt state into
* sync, then restoring the previous state.
*/
spl = splhigh();
splx(spl);
/*
* The processor turned interrupts off when it took the trap.
*
* While we're in the kernel, and not actually handling an
* interrupt, restore the interrupt state to where it was in
* the previous context, which may be low (interrupts on).
*
* Do this by forcing splhigh(), which may do a redundant
* cpu_irqoff() but forces the stored MI interrupt state into
* sync, then restoring the previous state.
*/
spl = splhigh();
splx(spl);
/* Syscall? Call the syscall handler and return. */
if (code == EX_SYS) {
/* Interrupts should have been on while in user mode. */
KASSERT(curthread->t_curspl == 0);
KASSERT(curthread->t_iplhigh_count == 0);
/* Syscall? Call the syscall handler and return. */
if (code == EX_SYS) {
/* Interrupts should have been on while in user mode. */
KASSERT(curthread->t_curspl == 0);
KASSERT(curthread->t_iplhigh_count == 0);
DEBUG(DB_SYSCALL, "syscall: #%d, args %x %x %x %x\n",
tf->tf_v0, tf->tf_a0, tf->tf_a1, tf->tf_a2, tf->tf_a3);
DEBUG(DB_SYSCALL, "syscall: #%d, args %x %x %x %x\n", tf->tf_v0, tf->tf_a0,
tf->tf_a1, tf->tf_a2, tf->tf_a3);
syscall(tf);
goto done;
}
syscall(tf);
goto done;
}
/*
* Ok, it wasn't any of the really easy cases.
* Call vm_fault on the TLB exceptions.
* Panic on the bus error exceptions.
*/
switch (code) {
case EX_MOD:
if (vm_fault(VM_FAULT_READONLY, tf->tf_vaddr)==0) {
goto done;
}
break;
case EX_TLBL:
if (vm_fault(VM_FAULT_READ, tf->tf_vaddr)==0) {
goto done;
}
break;
case EX_TLBS:
if (vm_fault(VM_FAULT_WRITE, tf->tf_vaddr)==0) {
goto done;
}
break;
case EX_IBE:
case EX_DBE:
/*
* This means you loaded invalid TLB entries, or
* touched invalid parts of the direct-mapped
* segments. These are serious kernel errors, so
* panic.
*
* The MIPS won't even tell you what invalid address
* caused the bus error.
*/
panic("Bus error exception, PC=0x%x\n", tf->tf_epc);
break;
}
/*
* Ok, it wasn't any of the really easy cases.
* Call vm_fault on the TLB exceptions.
* Panic on the bus error exceptions.
*/
switch (code) {
case EX_MOD:
if (vm_fault(VM_FAULT_READONLY, tf->tf_vaddr) == 0) {
goto done;
}
break;
case EX_TLBL:
if (vm_fault(VM_FAULT_READ, tf->tf_vaddr) == 0) {
goto done;
}
break;
case EX_TLBS:
if (vm_fault(VM_FAULT_WRITE, tf->tf_vaddr) == 0) {
goto done;
}
break;
case EX_IBE:
case EX_DBE:
/*
* This means you loaded invalid TLB entries, or
* touched invalid parts of the direct-mapped
* segments. These are serious kernel errors, so
* panic.
*
* The MIPS won't even tell you what invalid address
* caused the bus error.
*/
panic("Bus error exception, PC=0x%x\n", tf->tf_epc);
break;
}
/*
* If we get to this point, it's a fatal fault - either it's
* one of the other exceptions, like illegal instruction, or
* it was a page fault we couldn't handle.
*/
/*
* If we get to this point, it's a fatal fault - either it's
* one of the other exceptions, like illegal instruction, or
* it was a page fault we couldn't handle.
*/
if (!iskern) {
/*
* Fatal fault in user mode.
* Kill the current user process.
*/
kill_curthread(tf->tf_epc, code, tf->tf_vaddr);
goto done;
}
if (!iskern) {
/*
* Fatal fault in user mode.
* Kill the current user process.
*/
kill_curthread(tf->tf_epc, code, tf->tf_vaddr);
goto done;
}
/*
* Fatal fault in kernel mode.
*
* If pcb_badfaultfunc is set, we do not panic; badfaultfunc is
* set by copyin/copyout and related functions to signify that
* the addresses they're accessing are userlevel-supplied and
* not trustable. What we actually want to do is resume
* execution at the function pointed to by badfaultfunc. That's
* going to be "copyfail" (see copyinout.c), which longjmps
* back to copyin/copyout or wherever and returns EFAULT.
*
* Note that we do not just *call* this function, because that
* won't necessarily do anything. We want the control flow
* that is currently executing in copyin (or whichever), and
* is stopped while we process the exception, to *teleport* to
* copyfail.
*
* This is accomplished by changing tf->tf_epc and returning
* from the exception handler.
*/
/*
* Fatal fault in kernel mode.
*
* If pcb_badfaultfunc is set, we do not panic; badfaultfunc is
* set by copyin/copyout and related functions to signify that
* the addresses they're accessing are userlevel-supplied and
* not trustable. What we actually want to do is resume
* execution at the function pointed to by badfaultfunc. That's
* going to be "copyfail" (see copyinout.c), which longjmps
* back to copyin/copyout or wherever and returns EFAULT.
*
* Note that we do not just *call* this function, because that
* won't necessarily do anything. We want the control flow
* that is currently executing in copyin (or whichever), and
* is stopped while we process the exception, to *teleport* to
* copyfail.
*
* This is accomplished by changing tf->tf_epc and returning
* from the exception handler.
*/
if (curthread != NULL &&
curthread->t_machdep.tm_badfaultfunc != NULL) {
tf->tf_epc = (vaddr_t) curthread->t_machdep.tm_badfaultfunc;
goto done;
}
if (curthread != NULL && curthread->t_machdep.tm_badfaultfunc != NULL) {
tf->tf_epc = (vaddr_t)curthread->t_machdep.tm_badfaultfunc;
goto done;
}
/*
* Really fatal kernel-mode fault.
*/
/*
* Really fatal kernel-mode fault.
*/
kprintf("panic: Fatal exception %u (%s) in kernel mode\n", code,
trapcodenames[code]);
kprintf("panic: EPC 0x%x, exception vaddr 0x%x\n",
tf->tf_epc, tf->tf_vaddr);
kprintf("panic: Fatal exception %u (%s) in kernel mode\n", code,
trapcodenames[code]);
kprintf("panic: EPC 0x%x, exception vaddr 0x%x\n", tf->tf_epc, tf->tf_vaddr);
panic("I can't handle this... I think I'll just die now...\n");
panic("I can't handle this... I think I'll just die now...\n");
done:
/*
* Turn interrupts off on the processor, without affecting the
* stored interrupt state.
*/
cpu_irqoff();
done2:
done:
/*
* Turn interrupts off on the processor, without affecting the
* stored interrupt state.
*/
cpu_irqoff();
done2:
/*
* The boot thread can get here (e.g. on interrupt return) but
* since it doesn't go to userlevel, it can't be returning to
* userlevel, so there's no need to set cputhreads[] and
* cpustacks[]. Just return.
*/
if (curthread->t_stack == NULL) {
return;
}
/*
* The boot thread can get here (e.g. on interrupt return) but
* since it doesn't go to userlevel, it can't be returning to
* userlevel, so there's no need to set cputhreads[] and
* cpustacks[]. Just return.
*/
if (curthread->t_stack == NULL) {
return;
}
cputhreads[curcpu->c_number] = (vaddr_t)curthread;
cpustacks[curcpu->c_number] = (vaddr_t)curthread->t_stack + STACK_SIZE;
cputhreads[curcpu->c_number] = (vaddr_t)curthread;
cpustacks[curcpu->c_number] = (vaddr_t)curthread->t_stack + STACK_SIZE;
/*
* This assertion will fail if either
* (1) curthread->t_stack is corrupted, or
* (2) the trap frame is somehow on the wrong kernel stack.
*
* If cpustacks[] is corrupted, the next trap back to the
* kernel will (most likely) hang the system, so it's better
* to find out now.
*/
KASSERT(SAME_STACK(cpustacks[curcpu->c_number]-1, (vaddr_t)tf));
/*
* This assertion will fail if either
* (1) curthread->t_stack is corrupted, or
* (2) the trap frame is somehow on the wrong kernel stack.
*
* If cpustacks[] is corrupted, the next trap back to the
* kernel will (most likely) hang the system, so it's better
* to find out now.
*/
KASSERT(SAME_STACK(cpustacks[curcpu->c_number] - 1, (vaddr_t)tf));
}
/*
@@ -364,43 +345,41 @@ mips_trap(struct trapframe *tf)
* - enter_new_process, for use by exec and equivalent.
* - enter_forked_process, in syscall.c, for use by fork.
*/
void
mips_usermode(struct trapframe *tf)
{
void mips_usermode(struct trapframe *tf) {
/*
* Interrupts should be off within the kernel while entering
* user mode. However, while in user mode, interrupts should
* be on. To interact properly with the spl-handling logic
* above, we explicitly call spl0() and then call cpu_irqoff().
*/
spl0();
cpu_irqoff();
/*
* Interrupts should be off within the kernel while entering
* user mode. However, while in user mode, interrupts should
* be on. To interact properly with the spl-handling logic
* above, we explicitly call spl0() and then call cpu_irqoff().
*/
spl0();
cpu_irqoff();
cputhreads[curcpu->c_number] = (vaddr_t)curthread;
cpustacks[curcpu->c_number] = (vaddr_t)curthread->t_stack + STACK_SIZE;
cputhreads[curcpu->c_number] = (vaddr_t)curthread;
cpustacks[curcpu->c_number] = (vaddr_t)curthread->t_stack + STACK_SIZE;
/*
* This assertion will fail if either
* (1) cpustacks[] is corrupted, or
* (2) the trap frame is not on our own kernel stack, or
* (3) the boot thread tries to enter user mode.
*
* If cpustacks[] is corrupted, the next trap back to the
* kernel will (most likely) hang the system, so it's better
* to find out now.
*
* It's necessary for the trap frame used here to be on the
* current thread's own stack. It cannot correctly be on
* either another thread's stack or in the kernel heap.
* (Exercise: why?)
*/
KASSERT(SAME_STACK(cpustacks[curcpu->c_number]-1, (vaddr_t)tf));
/*
* This assertion will fail if either
* (1) cpustacks[] is corrupted, or
* (2) the trap frame is not on our own kernel stack, or
* (3) the boot thread tries to enter user mode.
*
* If cpustacks[] is corrupted, the next trap back to the
* kernel will (most likely) hang the system, so it's better
* to find out now.
*
* It's necessary for the trap frame used here to be on the
* current thread's own stack. It cannot correctly be on
* either another thread's stack or in the kernel heap.
* (Exercise: why?)
*/
KASSERT(SAME_STACK(cpustacks[curcpu->c_number] - 1, (vaddr_t)tf));
/*
* This actually does it. See exception-*.S.
*/
asm_usermode(tf);
/*
* This actually does it. See exception-*.S.
*/
asm_usermode(tf);
}
/*
@@ -419,20 +398,18 @@ mips_usermode(struct trapframe *tf)
*
* Works by creating an ersatz trapframe.
*/
void
enter_new_process(int argc, userptr_t argv, userptr_t env,
vaddr_t stack, vaddr_t entry)
{
struct trapframe tf;
void enter_new_process(int argc, userptr_t argv, userptr_t env, vaddr_t stack,
vaddr_t entry) {
struct trapframe tf;
bzero(&tf, sizeof(tf));
bzero(&tf, sizeof(tf));
tf.tf_status = CST_IRQMASK | CST_IEp | CST_KUp;
tf.tf_epc = entry;
tf.tf_a0 = argc;
tf.tf_a1 = (vaddr_t)argv;
tf.tf_a2 = (vaddr_t)env;
tf.tf_sp = stack;
tf.tf_status = CST_IRQMASK | CST_IEp | CST_KUp;
tf.tf_epc = entry;
tf.tf_a0 = argc;
tf.tf_a1 = (vaddr_t)argv;
tf.tf_a2 = (vaddr_t)env;
tf.tf_sp = stack;
mips_usermode(&tf);
mips_usermode(&tf);
}

116
kern/arch/mips/syscall/syscall.c
View File

@@ -36,7 +36,6 @@
#include <current.h>
#include <syscall.h>
/*
* System call dispatcher.
*
@@ -75,75 +74,70 @@
* stack, starting at sp+16 to skip over the slots for the
* registerized values, with copyin().
*/
void
syscall(struct trapframe *tf)
{
int callno;
int32_t retval;
int err;
void syscall(struct trapframe *tf) {
int callno;
int32_t retval;
int err;
KASSERT(curthread != NULL);
KASSERT(curthread->t_curspl == 0);
KASSERT(curthread->t_iplhigh_count == 0);
KASSERT(curthread != NULL);
KASSERT(curthread->t_curspl == 0);
KASSERT(curthread->t_iplhigh_count == 0);
callno = tf->tf_v0;
callno = tf->tf_v0;
/*
* Initialize retval to 0. Many of the system calls don't
* really return a value, just 0 for success and -1 on
* error. Since retval is the value returned on success,
* initialize it to 0 by default; thus it's not necessary to
* deal with it except for calls that return other values,
* like write.
*/
/*
* Initialize retval to 0. Many of the system calls don't
* really return a value, just 0 for success and -1 on
* error. Since retval is the value returned on success,
* initialize it to 0 by default; thus it's not necessary to
* deal with it except for calls that return other values,
* like write.
*/
retval = 0;
retval = 0;
switch (callno) {
case SYS_reboot:
err = sys_reboot(tf->tf_a0);
break;
switch (callno) {
case SYS_reboot:
err = sys_reboot(tf->tf_a0);
break;
case SYS___time:
err = sys___time((userptr_t)tf->tf_a0,
(userptr_t)tf->tf_a1);
break;
case SYS___time:
err = sys___time((userptr_t)tf->tf_a0, (userptr_t)tf->tf_a1);
break;
/* Add stuff here */
/* Add stuff here */
default:
kprintf("Unknown syscall %d\n", callno);
err = ENOSYS;
break;
}
default:
kprintf("Unknown syscall %d\n", callno);
err = ENOSYS;
break;
}
if (err) {
/*
* Return the error code. This gets converted at
* userlevel to a return value of -1 and the error
* code in errno.
*/
tf->tf_v0 = err;
tf->tf_a3 = 1; /* signal an error */
} else {
/* Success. */
tf->tf_v0 = retval;
tf->tf_a3 = 0; /* signal no error */
}
if (err) {
/*
* Return the error code. This gets converted at
* userlevel to a return value of -1 and the error
* code in errno.
*/
tf->tf_v0 = err;
tf->tf_a3 = 1; /* signal an error */
}
else {
/* Success. */
tf->tf_v0 = retval;
tf->tf_a3 = 0; /* signal no error */
}
/*
* Now, advance the program counter, to avoid restarting
* the syscall over and over again.
*/
/*
* Now, advance the program counter, to avoid restarting
* the syscall over and over again.
*/
tf->tf_epc += 4;
tf->tf_epc += 4;
/* Make sure the syscall code didn't forget to lower spl */
KASSERT(curthread->t_curspl == 0);
/* ...or leak any spinlocks */
KASSERT(curthread->t_iplhigh_count == 0);
/* Make sure the syscall code didn't forget to lower spl */
KASSERT(curthread->t_curspl == 0);
/* ...or leak any spinlocks */
KASSERT(curthread->t_iplhigh_count == 0);
}
/*
@@ -154,8 +148,4 @@ syscall(struct trapframe *tf)
*
* Thus, you can trash it and do things another way if you prefer.
*/
void
enter_forked_process(struct trapframe *tf)
{
(void)tf;
}
void enter_forked_process(struct trapframe *tf) { (void)tf; }

245
kern/arch/mips/thread/cpu.c
View File

@@ -72,30 +72,27 @@ vaddr_t cputhreads[MAXCPUS];
* associated with a new cpu. Note that we're not running on the new
* cpu when this is called.
*/
void
cpu_machdep_init(struct cpu *c)
{
vaddr_t stackpointer;
void cpu_machdep_init(struct cpu *c) {
vaddr_t stackpointer;
KASSERT(c->c_number < MAXCPUS);
KASSERT(c->c_number < MAXCPUS);
if (c->c_curthread->t_stack == NULL) {
/* boot cpu; don't need to do anything here */
}
else {
/*
* Stick the stack in cpustacks[], and thread pointer
* in cputhreads[].
*/
if (c->c_curthread->t_stack == NULL) {
/* boot cpu; don't need to do anything here */
} else {
/*
* Stick the stack in cpustacks[], and thread pointer
* in cputhreads[].
*/
/* stack base address */
stackpointer = (vaddr_t) c->c_curthread->t_stack;
/* since stacks grow down, get the top */
stackpointer += STACK_SIZE;
/* stack base address */
stackpointer = (vaddr_t)c->c_curthread->t_stack;
/* since stacks grow down, get the top */
stackpointer += STACK_SIZE;
cpustacks[c->c_number] = stackpointer;
cputhreads[c->c_number] = (vaddr_t)c->c_curthread;
}
cpustacks[c->c_number] = stackpointer;
cputhreads[c->c_number] = (vaddr_t)c->c_curthread;
}
}
////////////////////////////////////////////////////////////
@@ -107,73 +104,61 @@ cpu_machdep_init(struct cpu *c)
* System/161 processor-ID values.
*/
#define SYS161_PRID_ORIG 0x000003ff
#define SYS161_PRID_2X 0x000000a1
#define SYS161_PRID_ORIG 0x000003ff
#define SYS161_PRID_2X 0x000000a1
static inline
uint32_t
cpu_getprid(void)
{
uint32_t prid;
static inline uint32_t cpu_getprid(void) {
uint32_t prid;
__asm volatile("mfc0 %0,$15" : "=r" (prid));
return prid;
__asm volatile("mfc0 %0,$15" : "=r"(prid));
return prid;
}
static inline
uint32_t
cpu_getfeatures(void)
{
uint32_t features;
static inline uint32_t cpu_getfeatures(void) {
uint32_t features;
__asm volatile(".set push;" /* save assembler mode */
".set mips32;" /* allow mips32 instructions */
"mfc0 %0,$15,1;" /* get cop0 reg 15 sel 1 */
".set pop" /* restore assembler mode */
: "=r" (features));
return features;
__asm volatile(".set push;" /* save assembler mode */
".set mips32;" /* allow mips32 instructions */
"mfc0 %0,$15,1;" /* get cop0 reg 15 sel 1 */
".set pop" /* restore assembler mode */
: "=r"(features));
return features;
}
static inline
uint32_t
cpu_getifeatures(void)
{
uint32_t features;
static inline uint32_t cpu_getifeatures(void) {
uint32_t features;
__asm volatile(".set push;" /* save assembler mode */
".set mips32;" /* allow mips32 instructions */
"mfc0 %0,$15,2;" /* get cop0 reg 15 sel 2 */
".set pop" /* restore assembler mode */
: "=r" (features));
return features;
__asm volatile(".set push;" /* save assembler mode */
".set mips32;" /* allow mips32 instructions */
"mfc0 %0,$15,2;" /* get cop0 reg 15 sel 2 */
".set pop" /* restore assembler mode */
: "=r"(features));
return features;
}
void
cpu_identify(char *buf, size_t max)
{
uint32_t prid;
uint32_t features;
void cpu_identify(char *buf, size_t max) {
uint32_t prid;
uint32_t features;
prid = cpu_getprid();
switch (prid) {
case SYS161_PRID_ORIG:
snprintf(buf, max, "MIPS/161 (System/161 1.x and pre-2.x)");
break;
case SYS161_PRID_2X:
features = cpu_getfeatures();
snprintf(buf, max, "MIPS/161 (System/161 2.x) features 0x%x",
features);
features = cpu_getifeatures();
if (features != 0) {
kprintf("WARNING: unknown CPU incompatible features "
"0x%x\n", features);
}
break;
default:
snprintf(buf, max, "32-bit MIPS (unknown type, CPU ID 0x%x)",
prid);
break;
}
prid = cpu_getprid();
switch (prid) {
case SYS161_PRID_ORIG:
snprintf(buf, max, "MIPS/161 (System/161 1.x and pre-2.x)");
break;
case SYS161_PRID_2X:
features = cpu_getfeatures();
snprintf(buf, max, "MIPS/161 (System/161 2.x) features 0x%x", features);
features = cpu_getifeatures();
if (features != 0) {
kprintf("WARNING: unknown CPU incompatible features "
"0x%x\n",
features);
}
break;
default:
snprintf(buf, max, "32-bit MIPS (unknown type, CPU ID 0x%x)", prid);
break;
}
}
////////////////////////////////////////////////////////////
@@ -200,50 +185,43 @@ cpu_identify(char *buf, size_t max)
* These considerations do not (currently) apply to System/161,
* however.
*/
#define GET_STATUS(x) __asm volatile("mfc0 %0,$12" : "=r" (x))
#define SET_STATUS(x) __asm volatile("mtc0 %0,$12" :: "r" (x))
#define GET_STATUS(x) __asm volatile("mfc0 %0,$12" : "=r"(x))
#define SET_STATUS(x) __asm volatile("mtc0 %0,$12" ::"r"(x))
/*
* Interrupts on.
*/
void
cpu_irqon(void)
{
uint32_t x;
void cpu_irqon(void) {
uint32_t x;
GET_STATUS(x);
x |= CST_IEc;
SET_STATUS(x);
GET_STATUS(x);
x |= CST_IEc;
SET_STATUS(x);
}
/*
* Interrupts off.
*/
void
cpu_irqoff(void)
{
uint32_t x;
void cpu_irqoff(void) {
uint32_t x;
GET_STATUS(x);
x &= ~(uint32_t)CST_IEc;
SET_STATUS(x);
GET_STATUS(x);
x &= ~(uint32_t)CST_IEc;
SET_STATUS(x);
}
/*
* Used below.
*/
static
void
cpu_irqonoff(void)
{
uint32_t x, xon, xoff;
static void cpu_irqonoff(void) {
uint32_t x, xon, xoff;
GET_STATUS(x);
xon = x | CST_IEc;
xoff = x & ~(uint32_t)CST_IEc;
SET_STATUS(xon);
__asm volatile("nop; nop; nop; nop");
SET_STATUS(xoff);
GET_STATUS(x);
xon = x | CST_IEc;
xoff = x & ~(uint32_t)CST_IEc;
SET_STATUS(xon);
__asm volatile("nop; nop; nop; nop");
SET_STATUS(xoff);
}
////////////////////////////////////////////////////////////
@@ -261,49 +239,40 @@ cpu_irqonoff(void)
* appropriate the mips32 WAIT instruction.
*/
static
inline
void
wait(void)
{
/*
* The WAIT instruction goes into powersave mode until an
* interrupt is trying to occur.
*
* Then switch interrupts on and off again, so we actually
* take the interrupt.
*
* Note that the precise behavior of this instruction in the
* System/161 simulator is partly guesswork. This code may not
* work on a real mips.
*/
__asm volatile(
".set push;" /* save assembler mode */
".set mips32;" /* allow MIPS32 instructions */
".set volatile;" /* avoid unwanted optimization */
"wait;" /* suspend until interrupted */
".set pop" /* restore assembler mode */
);
static inline void wait(void) {
/*
* The WAIT instruction goes into powersave mode until an
* interrupt is trying to occur.
*
* Then switch interrupts on and off again, so we actually
* take the interrupt.
*
* Note that the precise behavior of this instruction in the
* System/161 simulator is partly guesswork. This code may not
* work on a real mips.
*/
__asm volatile(".set push;" /* save assembler mode */
".set mips32;" /* allow MIPS32 instructions */
".set volatile;" /* avoid unwanted optimization */
"wait;" /* suspend until interrupted */
".set pop" /* restore assembler mode */
);
}
/*
* Idle the processor until something happens.
*/
void
cpu_idle(void)
{
wait();
cpu_irqonoff();
void cpu_idle(void) {
wait();
cpu_irqonoff();
}
/*
* Halt the CPU permanently.
*/
void
cpu_halt(void)
{
cpu_irqoff();
while (1) {
wait();
}
void cpu_halt(void) {
cpu_irqoff();
while (1) {
wait();
}
}

79
kern/arch/mips/thread/switchframe.c
View File

@@ -37,7 +37,6 @@
/* in threadstart.S */
extern void mips_threadstart(/* arguments are in unusual registers */);
/*
* Function to initialize the switchframe of a new thread, which is
* *not* the one that is currently running.
@@ -51,48 +50,46 @@ extern void mips_threadstart(/* arguments are in unusual registers */);
* store the arguments in the s* registers, and use a bit of asm
* (mips_threadstart) to move them and then jump to thread_startup.
*/
void
switchframe_init(struct thread *thread,
void (*entrypoint)(void *data1, unsigned long data2),
void *data1, unsigned long data2)
{
vaddr_t stacktop;
struct switchframe *sf;
void switchframe_init(struct thread *thread,
void (*entrypoint)(void *data1, unsigned long data2),
void *data1, unsigned long data2) {
vaddr_t stacktop;
struct switchframe *sf;
/*
* MIPS stacks grow down. t_stack is just a hunk of memory, so
* get the other end of it. Then set up a switchframe on the
* top of the stack.
*/
stacktop = ((vaddr_t)thread->t_stack) + STACK_SIZE;
sf = ((struct switchframe *) stacktop) - 1;
/*
* MIPS stacks grow down. t_stack is just a hunk of memory, so
* get the other end of it. Then set up a switchframe on the
* top of the stack.
*/
stacktop = ((vaddr_t)thread->t_stack) + STACK_SIZE;
sf = ((struct switchframe *)stacktop) - 1;
/* Zero out the switchframe. */
bzero(sf, sizeof(*sf));
/* Zero out the switchframe. */
bzero(sf, sizeof(*sf));
/*
* Now set the important parts: pass through the three arguments,
* and set the return address register to the place we want
* execution to begin.
*
* Thus, when switchframe_switch does its "j ra", it will
* actually jump to mips_threadstart, which will move the
* arguments into the right register and jump to
* thread_startup().
*
* Note that this means that when we call switchframe_switch()
* in thread_switch(), we may not come back out the same way
* in the next thread. (Though we will come back out the same
* way when we later come back to the same thread again.)
*
* This has implications for code at the bottom of
* thread_switch, described in thread.c.
*/
sf->sf_s0 = (uint32_t)entrypoint;
sf->sf_s1 = (uint32_t)data1;
sf->sf_s2 = (uint32_t)data2;
sf->sf_ra = (uint32_t)mips_threadstart;
/*
* Now set the important parts: pass through the three arguments,
* and set the return address register to the place we want
* execution to begin.
*
* Thus, when switchframe_switch does its "j ra", it will
* actually jump to mips_threadstart, which will move the
* arguments into the right register and jump to
* thread_startup().
*
* Note that this means that when we call switchframe_switch()
* in thread_switch(), we may not come back out the same way
* in the next thread. (Though we will come back out the same
* way when we later come back to the same thread again.)
*
* This has implications for code at the bottom of
* thread_switch, described in thread.c.
*/
sf->sf_s0 = (uint32_t)entrypoint;
sf->sf_s1 = (uint32_t)data1;
sf->sf_s2 = (uint32_t)data2;
sf->sf_ra = (uint32_t)mips_threadstart;
/* Set ->t_context, and we're done. */
thread->t_context = sf;
/* Set ->t_context, and we're done. */
thread->t_context = sf;
}

20
kern/arch/mips/thread/switchframe.h
View File

@@ -37,16 +37,16 @@
*/
struct switchframe {
uint32_t sf_s0;
uint32_t sf_s1;
uint32_t sf_s2;
uint32_t sf_s3;
uint32_t sf_s4;
uint32_t sf_s5;
uint32_t sf_s6;
uint32_t sf_s8;
uint32_t sf_gp;
uint32_t sf_ra;
uint32_t sf_s0;
uint32_t sf_s1;
uint32_t sf_s2;
uint32_t sf_s3;
uint32_t sf_s4;
uint32_t sf_s5;
uint32_t sf_s6;
uint32_t sf_s8;
uint32_t sf_gp;
uint32_t sf_ra;
};
#endif /* _MIPS_SWITCHFRAME_H_ */

12
kern/arch/mips/thread/thread_machdep.c
View File

@@ -36,14 +36,10 @@
#include <thread.h>
#include <threadprivate.h>
void
thread_machdep_init(struct thread_machdep *tm)
{
tm->tm_badfaultfunc = NULL;
void thread_machdep_init(struct thread_machdep *tm) {
tm->tm_badfaultfunc = NULL;
}
void
thread_machdep_cleanup(struct thread_machdep *tm)
{
KASSERT(tm->tm_badfaultfunc == NULL);
void thread_machdep_cleanup(struct thread_machdep *tm) {
KASSERT(tm->tm_badfaultfunc == NULL);
}

554
kern/arch/mips/vm/dumbvm.c
View File

@@ -57,18 +57,14 @@
/* under dumbvm, always have 72k of user stack */
/* (this must be > 64K so argument blocks of size ARG_MAX will fit) */
#define DUMBVM_STACKPAGES 18
#define DUMBVM_STACKPAGES 18
/*
* Wrap ram_stealmem in a spinlock.
*/
static struct spinlock stealmem_lock = SPINLOCK_INITIALIZER;
void
vm_bootstrap(void)
{
/* Do nothing. */
}
void vm_bootstrap(void) { /* Do nothing. */ }
/*
* Check if we're in a context that can sleep. While most of the
@@ -77,351 +73,311 @@ vm_bootstrap(void)
* avoid the situation where syscall-layer code that works ok with
* dumbvm starts blowing up during the VM assignment.
*/
static
void
dumbvm_can_sleep(void)
{
if (CURCPU_EXISTS()) {
/* must not hold spinlocks */
KASSERT(curcpu->c_spinlocks == 0);
static void dumbvm_can_sleep(void) {
if (CURCPU_EXISTS()) {
/* must not hold spinlocks */
KASSERT(curcpu->c_spinlocks == 0);
/* must not be in an interrupt handler */
KASSERT(curthread->t_in_interrupt == 0);
}
/* must not be in an interrupt handler */
KASSERT(curthread->t_in_interrupt == 0);
}
}
static
paddr_t
getppages(unsigned long npages)
{
paddr_t addr;
static paddr_t getppages(unsigned long npages) {
paddr_t addr;
spinlock_acquire(&stealmem_lock);
spinlock_acquire(&stealmem_lock);
addr = ram_stealmem(npages);
addr = ram_stealmem(npages);
spinlock_release(&stealmem_lock);
return addr;
spinlock_release(&stealmem_lock);
return addr;
}
/* Allocate/free some kernel-space virtual pages */
vaddr_t
alloc_kpages(unsigned npages)
{
paddr_t pa;
vaddr_t alloc_kpages(unsigned npages) {
paddr_t pa;
dumbvm_can_sleep();
pa = getppages(npages);
if (pa==0) {
return 0;
}
return PADDR_TO_KVADDR(pa);
dumbvm_can_sleep();
pa = getppages(npages);
if (pa == 0) {
return 0;
}
return PADDR_TO_KVADDR(pa);
}
void
free_kpages(vaddr_t addr)
{
/* nothing - leak the memory. */
void free_kpages(vaddr_t addr) {
/* nothing - leak the memory. */
(void)addr;
(void)addr;
}
void
vm_tlbshootdown(const struct tlbshootdown *ts)
{
(void)ts;
panic("dumbvm tried to do tlb shootdown?!\n");
void vm_tlbshootdown(const struct tlbshootdown *ts) {
(void)ts;
panic("dumbvm tried to do tlb shootdown?!\n");
}
int
vm_fault(int faulttype, vaddr_t faultaddress)
{
vaddr_t vbase1, vtop1, vbase2, vtop2, stackbase, stacktop;
paddr_t paddr;
int i;
uint32_t ehi, elo;
struct addrspace *as;
int spl;
int vm_fault(int faulttype, vaddr_t faultaddress) {
vaddr_t vbase1, vtop1, vbase2, vtop2, stackbase, stacktop;
paddr_t paddr;
int i;
uint32_t ehi, elo;
struct addrspace *as;
int spl;
faultaddress &= PAGE_FRAME;
faultaddress &= PAGE_FRAME;
DEBUG(DB_VM, "dumbvm: fault: 0x%x\n", faultaddress);
DEBUG(DB_VM, "dumbvm: fault: 0x%x\n", faultaddress);
switch (faulttype) {
case VM_FAULT_READONLY:
/* We always create pages read-write, so we can't get this */
panic("dumbvm: got VM_FAULT_READONLY\n");
case VM_FAULT_READ:
case VM_FAULT_WRITE:
break;
default:
return EINVAL;
}
switch (faulttype) {
case VM_FAULT_READONLY:
/* We always create pages read-write, so we can't get this */
panic("dumbvm: got VM_FAULT_READONLY\n");
case VM_FAULT_READ:
case VM_FAULT_WRITE:
break;
default:
return EINVAL;
}
if (curproc == NULL) {
/*
* No process. This is probably a kernel fault early
* in boot. Return EFAULT so as to panic instead of
* getting into an infinite faulting loop.
*/
return EFAULT;
}
if (curproc == NULL) {
/*
* No process. This is probably a kernel fault early
* in boot. Return EFAULT so as to panic instead of
* getting into an infinite faulting loop.
*/
return EFAULT;
}
as = proc_getas();
if (as == NULL) {
/*
* No address space set up. This is probably also a
* kernel fault early in boot.
*/
return EFAULT;
}
as = proc_getas();
if (as == NULL) {
/*
* No address space set up. This is probably also a
* kernel fault early in boot.
*/
return EFAULT;
}
/* Assert that the address space has been set up properly. */
KASSERT(as->as_vbase1 != 0);
KASSERT(as->as_pbase1 != 0);
KASSERT(as->as_npages1 != 0);
KASSERT(as->as_vbase2 != 0);
KASSERT(as->as_pbase2 != 0);
KASSERT(as->as_npages2 != 0);
KASSERT(as->as_stackpbase != 0);
KASSERT((as->as_vbase1 & PAGE_FRAME) == as->as_vbase1);
KASSERT((as->as_pbase1 & PAGE_FRAME) == as->as_pbase1);
KASSERT((as->as_vbase2 & PAGE_FRAME) == as->as_vbase2);
KASSERT((as->as_pbase2 & PAGE_FRAME) == as->as_pbase2);
KASSERT((as->as_stackpbase & PAGE_FRAME) == as->as_stackpbase);
/* Assert that the address space has been set up properly. */
KASSERT(as->as_vbase1 != 0);
KASSERT(as->as_pbase1 != 0);
KASSERT(as->as_npages1 != 0);
KASSERT(as->as_vbase2 != 0);
KASSERT(as->as_pbase2 != 0);
KASSERT(as->as_npages2 != 0);
KASSERT(as->as_stackpbase != 0);
KASSERT((as->as_vbase1 & PAGE_FRAME) == as->as_vbase1);
KASSERT((as->as_pbase1 & PAGE_FRAME) == as->as_pbase1);
KASSERT((as->as_vbase2 & PAGE_FRAME) == as->as_vbase2);
KASSERT((as->as_pbase2 & PAGE_FRAME) == as->as_pbase2);
KASSERT((as->as_stackpbase & PAGE_FRAME) == as->as_stackpbase);
vbase1 = as->as_vbase1;
vtop1 = vbase1 + as->as_npages1 * PAGE_SIZE;
vbase2 = as->as_vbase2;
vtop2 = vbase2 + as->as_npages2 * PAGE_SIZE;
stackbase = USERSTACK - DUMBVM_STACKPAGES * PAGE_SIZE;
stacktop = USERSTACK;
vbase1 = as->as_vbase1;
vtop1 = vbase1 + as->as_npages1 * PAGE_SIZE;
vbase2 = as->as_vbase2;
vtop2 = vbase2 + as->as_npages2 * PAGE_SIZE;
stackbase = USERSTACK - DUMBVM_STACKPAGES * PAGE_SIZE;
stacktop = USERSTACK;
if (faultaddress >= vbase1 && faultaddress < vtop1) {
paddr = (faultaddress - vbase1) + as->as_pbase1;
}
else if (faultaddress >= vbase2 && faultaddress < vtop2) {
paddr = (faultaddress - vbase2) + as->as_pbase2;
}
else if (faultaddress >= stackbase && faultaddress < stacktop) {
paddr = (faultaddress - stackbase) + as->as_stackpbase;
}
else {
return EFAULT;
}
if (faultaddress >= vbase1 && faultaddress < vtop1) {
paddr = (faultaddress - vbase1) + as->as_pbase1;
} else if (faultaddress >= vbase2 && faultaddress < vtop2) {
paddr = (faultaddress - vbase2) + as->as_pbase2;
} else if (faultaddress >= stackbase && faultaddress < stacktop) {
paddr = (faultaddress - stackbase) + as->as_stackpbase;
} else {
return EFAULT;
}
/* make sure it's page-aligned */
KASSERT((paddr & PAGE_FRAME) == paddr);
/* make sure it's page-aligned */
KASSERT((paddr & PAGE_FRAME) == paddr);
/* Disable interrupts on this CPU while frobbing the TLB. */
spl = splhigh();
/* Disable interrupts on this CPU while frobbing the TLB. */
spl = splhigh();
for (i=0; i<NUM_TLB; i++) {
tlb_read(&ehi, &elo, i);
if (elo & TLBLO_VALID) {
continue;
}
ehi = faultaddress;
elo = paddr | TLBLO_DIRTY | TLBLO_VALID;
DEBUG(DB_VM, "dumbvm: 0x%x -> 0x%x\n", faultaddress, paddr);
tlb_write(ehi, elo, i);
splx(spl);
return 0;
}
for (i = 0; i < NUM_TLB; i++) {
tlb_read(&ehi, &elo, i);
if (elo & TLBLO_VALID) {
continue;
}
ehi = faultaddress;
elo = paddr | TLBLO_DIRTY | TLBLO_VALID;
DEBUG(DB_VM, "dumbvm: 0x%x -> 0x%x\n", faultaddress, paddr);
tlb_write(ehi, elo, i);
splx(spl);
return 0;
}
kprintf("dumbvm: Ran out of TLB entries - cannot handle page fault\n");
splx(spl);
return EFAULT;
kprintf("dumbvm: Ran out of TLB entries - cannot handle page fault\n");
splx(spl);
return EFAULT;
}
struct addrspace *
as_create(void)
{
struct addrspace *as = kmalloc(sizeof(struct addrspace));
if (as==NULL) {
return NULL;
}
struct addrspace *as_create(void) {
struct addrspace *as = kmalloc(sizeof(struct addrspace));
if (as == NULL) {
return NULL;
}
as->as_vbase1 = 0;
as->as_pbase1 = 0;
as->as_npages1 = 0;
as->as_vbase2 = 0;
as->as_pbase2 = 0;
as->as_npages2 = 0;
as->as_stackpbase = 0;
as->as_vbase1 = 0;
as->as_pbase1 = 0;
as->as_npages1 = 0;
as->as_vbase2 = 0;
as->as_pbase2 = 0;
as->as_npages2 = 0;
as->as_stackpbase = 0;
return as;
return as;
}
void
as_destroy(struct addrspace *as)
{
dumbvm_can_sleep();
kfree(as);
void as_destroy(struct addrspace *as) {
dumbvm_can_sleep();
kfree(as);
}
void
as_activate(void)
{
int i, spl;
struct addrspace *as;
void as_activate(void) {
int i, spl;
struct addrspace *as;
as = proc_getas();
if (as == NULL) {
return;
}
as = proc_getas();
if (as == NULL) {
return;
}
/* Disable interrupts on this CPU while frobbing the TLB. */
spl = splhigh();
/* Disable interrupts on this CPU while frobbing the TLB. */
spl = splhigh();
for (i=0; i<NUM_TLB; i++) {
tlb_write(TLBHI_INVALID(i), TLBLO_INVALID(), i);
}
for (i = 0; i < NUM_TLB; i++) {
tlb_write(TLBHI_INVALID(i), TLBLO_INVALID(), i);
}
splx(spl);
splx(spl);
}
void
as_deactivate(void)
{
/* nothing */
void as_deactivate(void) { /* nothing */ }
int as_define_region(struct addrspace *as, vaddr_t vaddr, size_t sz,
int readable, int writeable, int executable) {
size_t npages;
dumbvm_can_sleep();
/* Align the region. First, the base... */
sz += vaddr & ~(vaddr_t)PAGE_FRAME;
vaddr &= PAGE_FRAME;
/* ...and now the length. */
sz = (sz + PAGE_SIZE - 1) & PAGE_FRAME;
npages = sz / PAGE_SIZE;
/* We don't use these - all pages are read-write */
(void)readable;
(void)writeable;
(void)executable;
if (as->as_vbase1 == 0) {
as->as_vbase1 = vaddr;
as->as_npages1 = npages;
return 0;
}
if (as->as_vbase2 == 0) {
as->as_vbase2 = vaddr;
as->as_npages2 = npages;
return 0;
}
/*
* Support for more than two regions is not available.
*/
kprintf("dumbvm: Warning: too many regions\n");
return ENOSYS;
}
int
as_define_region(struct addrspace *as, vaddr_t vaddr, size_t sz,
int readable, int writeable, int executable)
{
size_t npages;
dumbvm_can_sleep();
/* Align the region. First, the base... */
sz += vaddr & ~(vaddr_t)PAGE_FRAME;
vaddr &= PAGE_FRAME;
/* ...and now the length. */
sz = (sz + PAGE_SIZE - 1) & PAGE_FRAME;
npages = sz / PAGE_SIZE;
/* We don't use these - all pages are read-write */
(void)readable;
(void)writeable;
(void)executable;
if (as->as_vbase1 == 0) {
as->as_vbase1 = vaddr;
as->as_npages1 = npages;
return 0;
}
if (as->as_vbase2 == 0) {
as->as_vbase2 = vaddr;
as->as_npages2 = npages;
return 0;
}
/*
* Support for more than two regions is not available.
*/
kprintf("dumbvm: Warning: too many regions\n");
return ENOSYS;
static void as_zero_region(paddr_t paddr, unsigned npages) {
bzero((void *)PADDR_TO_KVADDR(paddr), npages * PAGE_SIZE);
}
static
void
as_zero_region(paddr_t paddr, unsigned npages)
{
bzero((void *)PADDR_TO_KVADDR(paddr), npages * PAGE_SIZE);
int as_prepare_load(struct addrspace *as) {
KASSERT(as->as_pbase1 == 0);
KASSERT(as->as_pbase2 == 0);
KASSERT(as->as_stackpbase == 0);
dumbvm_can_sleep();
as->as_pbase1 = getppages(as->as_npages1);
if (as->as_pbase1 == 0) {
return ENOMEM;
}
as->as_pbase2 = getppages(as->as_npages2);
if (as->as_pbase2 == 0) {
return ENOMEM;
}
as->as_stackpbase = getppages(DUMBVM_STACKPAGES);
if (as->as_stackpbase == 0) {
return ENOMEM;
}
as_zero_region(as->as_pbase1, as->as_npages1);
as_zero_region(as->as_pbase2, as->as_npages2);
as_zero_region(as->as_stackpbase, DUMBVM_STACKPAGES);
return 0;
}
int
as_prepare_load(struct addrspace *as)
{
KASSERT(as->as_pbase1 == 0);
KASSERT(as->as_pbase2 == 0);
KASSERT(as->as_stackpbase == 0);
dumbvm_can_sleep();
as->as_pbase1 = getppages(as->as_npages1);
if (as->as_pbase1 == 0) {
return ENOMEM;
}
as->as_pbase2 = getppages(as->as_npages2);
if (as->as_pbase2 == 0) {
return ENOMEM;
}
as->as_stackpbase = getppages(DUMBVM_STACKPAGES);
if (as->as_stackpbase == 0) {
return ENOMEM;
}
as_zero_region(as->as_pbase1, as->as_npages1);
as_zero_region(as->as_pbase2, as->as_npages2);
as_zero_region(as->as_stackpbase, DUMBVM_STACKPAGES);
return 0;
int as_complete_load(struct addrspace *as) {
dumbvm_can_sleep();
(void)as;
return 0;
}
int
as_complete_load(struct addrspace *as)
{
dumbvm_can_sleep();
(void)as;
return 0;
int as_define_stack(struct addrspace *as, vaddr_t *stackptr) {
KASSERT(as->as_stackpbase != 0);
*stackptr = USERSTACK;
return 0;
}
int
as_define_stack(struct addrspace *as, vaddr_t *stackptr)
{
KASSERT(as->as_stackpbase != 0);
int as_copy(struct addrspace *old, struct addrspace **ret) {
struct addrspace *new;
*stackptr = USERSTACK;
return 0;
}
int
as_copy(struct addrspace *old, struct addrspace **ret)
{
struct addrspace *new;
dumbvm_can_sleep();
new = as_create();
if (new==NULL) {
return ENOMEM;
}
new->as_vbase1 = old->as_vbase1;
new->as_npages1 = old->as_npages1;
new->as_vbase2 = old->as_vbase2;
new->as_npages2 = old->as_npages2;
/* (Mis)use as_prepare_load to allocate some physical memory. */
if (as_prepare_load(new)) {
as_destroy(new);
return ENOMEM;
}
KASSERT(new->as_pbase1 != 0);
KASSERT(new->as_pbase2 != 0);
KASSERT(new->as_stackpbase != 0);
memmove((void *)PADDR_TO_KVADDR(new->as_pbase1),
(const void *)PADDR_TO_KVADDR(old->as_pbase1),
old->as_npages1*PAGE_SIZE);
memmove((void *)PADDR_TO_KVADDR(new->as_pbase2),
(const void *)PADDR_TO_KVADDR(old->as_pbase2),
old->as_npages2*PAGE_SIZE);
memmove((void *)PADDR_TO_KVADDR(new->as_stackpbase),
(const void *)PADDR_TO_KVADDR(old->as_stackpbase),
DUMBVM_STACKPAGES*PAGE_SIZE);
*ret = new;
return 0;
dumbvm_can_sleep();
new = as_create();
if (new == NULL) {
return ENOMEM;
}
new->as_vbase1 = old->as_vbase1;
new->as_npages1 = old->as_npages1;
new->as_vbase2 = old->as_vbase2;
new->as_npages2 = old->as_npages2;
/* (Mis)use as_prepare_load to allocate some physical memory. */
if (as_prepare_load(new)) {
as_destroy(new);
return ENOMEM;
}
KASSERT(new->as_pbase1 != 0);
KASSERT(new->as_pbase2 != 0);
KASSERT(new->as_stackpbase != 0);
memmove((void *)PADDR_TO_KVADDR(new->as_pbase1),
(const void *)PADDR_TO_KVADDR(old->as_pbase1),
old->as_npages1 * PAGE_SIZE);
memmove((void *)PADDR_TO_KVADDR(new->as_pbase2),
(const void *)PADDR_TO_KVADDR(old->as_pbase2),
old->as_npages2 * PAGE_SIZE);
memmove((void *)PADDR_TO_KVADDR(new->as_stackpbase),
(const void *)PADDR_TO_KVADDR(old->as_stackpbase),
DUMBVM_STACKPAGES * PAGE_SIZE);
*ret = new;
return 0;
}

92
kern/arch/mips/vm/ram.c
View File

@@ -32,45 +32,41 @@
#include <vm.h>
#include <mainbus.h>
vaddr_t firstfree; /* first free virtual address; set by start.S */
vaddr_t firstfree; /* first free virtual address; set by start.S */
static paddr_t firstpaddr; /* address of first free physical page */
static paddr_t lastpaddr; /* one past end of last free physical page */
static paddr_t firstpaddr; /* address of first free physical page */
static paddr_t lastpaddr; /* one past end of last free physical page */
/*
* Called very early in system boot to figure out how much physical
* RAM is available.
*/
void
ram_bootstrap(void)
{
size_t ramsize;
void ram_bootstrap(void) {
size_t ramsize;
/* Get size of RAM. */
ramsize = mainbus_ramsize();
/* Get size of RAM. */
ramsize = mainbus_ramsize();
/*
* This is the same as the last physical address, as long as
* we have less than 512 megabytes of memory. If we had more,
* we wouldn't be able to access it all through kseg0 and
* everything would get a lot more complicated. This is not a
* case we are going to worry about.
*/
if (ramsize > 512*1024*1024) {
ramsize = 512*1024*1024;
}
/*
* This is the same as the last physical address, as long as
* we have less than 512 megabytes of memory. If we had more,
* we wouldn't be able to access it all through kseg0 and
* everything would get a lot more complicated. This is not a
* case we are going to worry about.
*/
if (ramsize > 512 * 1024 * 1024) {
ramsize = 512 * 1024 * 1024;
}
lastpaddr = ramsize;
lastpaddr = ramsize;
/*
* Get first free virtual address from where start.S saved it.
* Convert to physical address.
*/
firstpaddr = firstfree - MIPS_KSEG0;
/*
* Get first free virtual address from where start.S saved it.
* Convert to physical address.
*/
firstpaddr = firstfree - MIPS_KSEG0;
kprintf("%uk physical memory available\n",
(lastpaddr-firstpaddr)/1024);
kprintf("%uk physical memory available\n", (lastpaddr - firstpaddr) / 1024);
}
/*
@@ -91,22 +87,20 @@ ram_bootstrap(void)
* This function should not be called once the VM system is initialized,
* so it is not synchronized.
*/
paddr_t
ram_stealmem(unsigned long npages)
{
size_t size;
paddr_t paddr;
paddr_t ram_stealmem(unsigned long npages) {
size_t size;
paddr_t paddr;
size = npages * PAGE_SIZE;
size = npages * PAGE_SIZE;
if (firstpaddr + size > lastpaddr) {
return 0;
}
if (firstpaddr + size > lastpaddr) {
return 0;
}
paddr = firstpaddr;
firstpaddr += size;
paddr = firstpaddr;
firstpaddr += size;
return paddr;
return paddr;
}
/*
@@ -124,11 +118,7 @@ ram_stealmem(unsigned long npages)
* initialize the VM system, after which the VM system should take
* charge of knowing what memory exists.
*/
paddr_t
ram_getsize(void)
{
return lastpaddr;
}
paddr_t ram_getsize(void) { return lastpaddr; }
/*
* This function is intended to be called by the VM system when it
@@ -142,12 +132,10 @@ ram_getsize(void)
* This function should not be called once the VM system is initialized,
* so it is not synchronized.
*/
paddr_t
ram_getfirstfree(void)
{
paddr_t ret;
paddr_t ram_getfirstfree(void) {
paddr_t ret;
ret = firstpaddr;
firstpaddr = lastpaddr = 0;
return ret;
ret = firstpaddr;
firstpaddr = lastpaddr = 0;
return ret;
}