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pmm: properly initialize bootloader reclaimable entries

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Co-authored-by: Matheus <matheusuky@gmail.com>
This commit is contained in:
iretq
2026-04-25 14:20:37 -03:00
committed by Matheus
parent 6086393571
commit f8ebf11003
1 changed files with 10 additions and 2 deletions
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kernel-src/mm/pmm.c
+10 -2
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@@ -213,6 +213,7 @@ void *pmm_allocpage(int section) {
}
void pmm_makefree(void *address, size_t count) {
MUTEX_ACQUIRE(&freelistmutex);
memorysize += PAGE_SIZE * count;
__assert(((uintptr_t)address % PAGE_SIZE) == 0);
uintmax_t baseid = (uintptr_t)address / PAGE_SIZE;
@@ -220,8 +221,10 @@ void pmm_makefree(void *address, size_t count) {
uintmax_t pageid = baseid + i;
PAGE_BOUNDARYCHECK(pageid);
page_t *page = &pages[pageid];
page->flags |= PAGE_FLAGS_FREE;
insertinfreelist(page);
}
MUTEX_RELEASE(&freelistmutex);
}
void pmm_init() {
@@ -253,7 +256,7 @@ void pmm_init() {
memset(pages, 0, pagecount * sizeof(page_t));
printf("pmm: %d pages used for page list\n", ROUND_UP(pagecount * sizeof(page_t), PAGE_SIZE) / PAGE_SIZE);
// place pages in free lists
// initialize usable memory
for (size_t i = 0; i < pmm_liminemap.response->entry_count; ++i) {
struct limine_memmap_entry *e = pmm_liminemap.response->entries[i];
if (e->type == LIMINE_MEMMAP_USABLE) {
@@ -262,6 +265,11 @@ void pmm_init() {
pages[i].flags |= PAGE_FLAGS_FREE;
insertinfreelist(&pages[i]);
}
} else if (e->type == LIMINE_MEMMAP_BOOTLOADER_RECLAIMABLE) {
for (int i = 0; i < e->length / PAGE_SIZE; ++i) {
page_t *page = &pages[(e->base / PAGE_SIZE) + i];
page->refcount = 1;
}
}
}
@@ -323,6 +331,6 @@ void pmm_free(void *addr, size_t size) {
}
void pmm_getinfo(size_t *total_pages, size_t *free_pages) {
*total_pages = pagecount;
*total_pages = memorysize / PAGE_SIZE;
*free_pages = freepagecount;
}