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kernel: spinlocks

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Matheus
2023-04-23 17:12:05 -03:00
parent f16091656a
commit 0394165361
8 changed files with 59 additions and 30 deletions
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kernel-src/mm/pmm.c
+9 -5
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@@ -3,12 +3,14 @@
#include <logging.h>
#include <string.h>
#include <arch/mmu.h>
#include <spinlock.h>
uintptr_t hhdmbase;
static size_t memorysize;
static size_t physicalpagecount;
typedef struct {
spinlock_t lock;
uintmax_t base;
uintmax_t top;
uintmax_t searchstart;
@@ -75,11 +77,12 @@ static inline void initsection(int section, uintmax_t base, uintmax_t top) {
.top = top,
.searchstart = base
};
SPINLOCK_INIT(bmsections[section].lock);
}
void *pmm_alloc(size_t size, int section) {
for (int i = section; i >= 0; --i) {
// TODO lock section
spinlock_acquire(&bmsections[i].lock);
uintmax_t page = getfreearea(&bmsections[i], size);
if (page) {
@@ -88,10 +91,11 @@ void *pmm_alloc(size_t size, int section) {
for (size_t j = 0; j < size; ++j)
bmset((void *)((page + j) * PAGE_SIZE), 0);
// TODO unlock
spinlock_release(&bmsections[i].lock);
return (void *)(page * PAGE_SIZE);
}
// TODO unlock section
spinlock_release(&bmsections[i].lock);
}
return NULL;
}
@@ -101,7 +105,7 @@ void pmm_free(void *addr, size_t size) {
for (int i = 0; i < PMM_SECTION_COUNT; ++i) {
if (page >= bmsections[i].base && page < bmsections[i].top) {
// TODO lock
spinlock_acquire(&bmsections[i].lock);
if ((uintptr_t)addr / PAGE_SIZE < bmsections[i].searchstart)
bmsections[i].searchstart = (uintptr_t)addr / PAGE_SIZE;
@@ -109,7 +113,7 @@ void pmm_free(void *addr, size_t size) {
for (uintmax_t j = 0; j < size; ++j)
bmset((void *)((page + j) * PAGE_SIZE), 1);
// TODO unlock
spinlock_release(&bmsections[i].lock);
return;
}
}