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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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70
kern/arch/mips/include/spinlock.h
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@@ -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_ */