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Matheus
55fc1b7026
I've decided to do a rewrite on it due to some plans that would make refcounting physical pages nescessary among other things. now instead of a bitmap it uses a list of pages with each physical page having a page_t associated with it
50 lines
1007 B
C
50 lines
1007 B
C
#ifndef _PMM_H
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#define _PMM_H
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#include <stddef.h>
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#include <stdint.h>
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#define PMM_SECTION_COUNT 3
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#define PMM_SECTION_1MB 0
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#define PMM_SECTION_4GB 1
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#define PMM_SECTION_DEFAULT 2
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#define PAGE_FLAGS_FREE 1
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typedef struct page_t {
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struct vnode_t *backing;
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uintmax_t offset;
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struct page_t *hashnext;
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struct page_t *hashprev;
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struct page_t *vnodenext;
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struct page_t *vnodeprev;
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union {
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struct {
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struct page_t *freenext;
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struct page_t *freeprev;
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};
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struct {
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struct page_t *writenext;
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struct page_t *writeprev;
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};
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};
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uintmax_t refcount;
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int flags;
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} page_t;
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void *pmm_allocpage(int section);
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page_t *pmm_getpage(void *addr);
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void pmm_hold(void *addr);
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void pmm_release(void *addr);
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void pmm_makefree(void *address, size_t count);
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void *pmm_alloc(size_t size, int section);
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void pmm_free(void *addr, size_t size);
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void pmm_init();
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extern uintptr_t hhdmbase;
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#define MAKE_HHDM(x) (void *)((uintptr_t)x + hhdmbase)
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#define FROM_HHDM(x) (void *)((uintptr_t)x - hhdmbase)
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#endif
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