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Initial page allocator

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This commit is contained in:
Ali Mashtizadeh 2014-02-18 10:48:35 -08:00
parent 11c151b60e
commit 35dc79b899
1 changed files with 18 additions and 4 deletions
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22
sys/kern/palloc.c
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@ -14,14 +14,14 @@
typedef struct FreePage
{
LIST_ENTRY(FreePage) entries;
TAILQ_ENTRY(FreePage) entries;
} FreePage;
LIST_HEAD(FreeListHead, FreePage) freeList;
TAILQ_HEAD(FreeListHead, FreePage) freeList;
void PAlloc_Init()
{
LIST_INIT(&freeList);
TAILQ_INIT(&freeList);
}
void PAlloc_AddRegion(uintptr_t start, uintptr_t len)
@ -39,15 +39,29 @@ void PAlloc_AddRegion(uintptr_t start, uintptr_t len)
for (i = 0; i < len; i += PGSIZE)
{
pg = (void *)(start + i);
LIST_INSERT_HEAD(&freeList, pg, entries);
TAILQ_INSERT_TAIL(&freeList, pg, entries);
}
}
void *PAlloc_AllocPage()
{
FreePage *pg = TAILQ_FIRST(&freeList);
TAILQ_REMOVE(&freeList, pg, entries);
// Assert page aligned
ASSERT((((uintptr_t)pg) & PGMASK) == 0);
return (void *)pg;
}
void PAlloc_FreePage(void *region)
{
FreePage *pg = (FreePage *)region;
// Assert page aligned
ASSERT((((uintptr_t)region) & PGMASK) == 0);
TAILQ_INSERT_HEAD(&freeList, pg, entries);
}