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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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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;
}