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148 lines
4.8 KiB
148 lines
4.8 KiB
#ifndef __KERN_MM_PMM_H__
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#define __KERN_MM_PMM_H__
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#include <defs.h>
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#include <mmu.h>
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#include <memlayout.h>
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#include <atomic.h>
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#include <assert.h>
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/* fork flags used in do_fork*/
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#define CLONE_VM 0x00000100 // set if VM shared between processes
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#define CLONE_THREAD 0x00000200 // thread group
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// pmm_manager is a physical memory management class. A special pmm manager - XXX_pmm_manager
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// only needs to implement the methods in pmm_manager class, then XXX_pmm_manager can be used
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// by ucore to manage the total physical memory space.
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struct pmm_manager {
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const char *name; // XXX_pmm_manager's name
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void (*init)(void); // initialize internal description&management data structure
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// (free block list, number of free block) of XXX_pmm_manager
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void (*init_memmap)(struct Page *base, size_t n); // setup description&management data structcure according to
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// the initial free physical memory space
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struct Page *(*alloc_pages)(size_t n); // allocate >=n pages, depend on the allocation algorithm
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void (*free_pages)(struct Page *base, size_t n); // free >=n pages with "base" addr of Page descriptor structures(memlayout.h)
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size_t (*nr_free_pages)(void); // return the number of free pages
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void (*check)(void); // check the correctness of XXX_pmm_manager
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};
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extern const struct pmm_manager *pmm_manager;
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extern pde_t *boot_pgdir;
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extern uintptr_t boot_cr3;
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void pmm_init(void);
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struct Page *alloc_pages(size_t n);
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void free_pages(struct Page *base, size_t n);
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size_t nr_free_pages(void);
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#define alloc_page() alloc_pages(1)
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#define free_page(page) free_pages(page, 1)
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pte_t *get_pte(pde_t *pgdir, uintptr_t la, bool create);
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struct Page *get_page(pde_t *pgdir, uintptr_t la, pte_t **ptep_store);
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void page_remove(pde_t *pgdir, uintptr_t la);
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int page_insert(pde_t *pgdir, struct Page *page, uintptr_t la, uint32_t perm);
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void load_esp0(uintptr_t esp0);
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void tlb_invalidate(pde_t *pgdir, uintptr_t la);
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struct Page *pgdir_alloc_page(pde_t *pgdir, uintptr_t la, uint32_t perm);
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void print_pgdir(void);
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/* *
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* PADDR - takes a kernel virtual address (an address that points above KERNBASE),
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* where the machine's maximum 256MB of physical memory is mapped and returns the
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* corresponding physical address. It panics if you pass it a non-kernel virtual address.
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* */
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#define PADDR(kva) ({ \
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uintptr_t __m_kva = (uintptr_t)(kva); \
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if (__m_kva < KERNBASE) { \
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panic("PADDR called with invalid kva %08lx", __m_kva); \
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} \
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__m_kva - KERNBASE; \
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})
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/* *
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* KADDR - takes a physical address and returns the corresponding kernel virtual
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* address. It panics if you pass an invalid physical address.
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* */
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#define KADDR(pa) ({ \
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uintptr_t __m_pa = (pa); \
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size_t __m_ppn = PPN(__m_pa); \
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if (__m_ppn >= npage) { \
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panic("KADDR called with invalid pa %08lx", __m_pa); \
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} \
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(void *) (__m_pa + KERNBASE); \
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})
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extern struct Page *pages;
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extern size_t npage;
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static inline ppn_t
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page2ppn(struct Page *page) {
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return page - pages;
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}
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static inline uintptr_t
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page2pa(struct Page *page) {
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return page2ppn(page) << PGSHIFT;
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}
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static inline struct Page *
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pa2page(uintptr_t pa) {
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if (PPN(pa) >= npage) {
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panic("pa2page called with invalid pa");
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}
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return &pages[PPN(pa)];
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}
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static inline void *
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page2kva(struct Page *page) {
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return KADDR(page2pa(page));
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}
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static inline struct Page *
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kva2page(void *kva) {
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return pa2page(PADDR(kva));
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}
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static inline struct Page *
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pte2page(pte_t pte) {
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if (!(pte & PTE_P)) {
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panic("pte2page called with invalid pte");
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}
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return pa2page(PTE_ADDR(pte));
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}
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static inline struct Page *
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pde2page(pde_t pde) {
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return pa2page(PDE_ADDR(pde));
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}
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static inline int
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page_ref(struct Page *page) {
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return page->ref;
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}
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static inline void
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set_page_ref(struct Page *page, int val) {
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page->ref = val;
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}
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static inline int
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page_ref_inc(struct Page *page) {
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page->ref += 1;
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return page->ref;
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}
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static inline int
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page_ref_dec(struct Page *page) {
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page->ref -= 1;
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return page->ref;
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}
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extern char bootstack[], bootstacktop[];
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#endif /* !__KERN_MM_PMM_H__ */
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