88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
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/* See COPYRIGHT for copyright information. */
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#ifndef JOS_KERN_PMAP_H
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#define JOS_KERN_PMAP_H
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#ifndef JOS_KERNEL
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# error "This is a JOS kernel header; user programs should not #include it"
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#endif
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#include <inc/memlayout.h>
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#include <inc/assert.h>
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extern char bootstacktop[], bootstack[];
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extern struct PageInfo *pages;
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extern size_t npages;
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extern pde_t *kern_pgdir;
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/* This macro takes a kernel virtual address -- an address that points above
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* KERNBASE, where the machine's maximum 256MB of physical memory is mapped --
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* and returns the corresponding physical address. It panics if you pass it a
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* non-kernel virtual address.
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*/
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#define PADDR(kva) _paddr(__FILE__, __LINE__, kva)
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static inline physaddr_t
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_paddr(const char *file, int line, void *kva)
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{
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if ((uint32_t)kva < KERNBASE)
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_panic(file, line, "PADDR called with invalid kva %08lx", kva);
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return (physaddr_t)kva - KERNBASE;
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}
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/* This macro takes a physical address and returns the corresponding kernel
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* virtual address. It panics if you pass an invalid physical address. */
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#define KADDR(pa) _kaddr(__FILE__, __LINE__, pa)
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static inline void*
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_kaddr(const char *file, int line, physaddr_t pa)
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{
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if (PGNUM(pa) >= npages)
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_panic(file, line, "KADDR called with invalid pa %08lx", pa);
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return (void *)(pa + KERNBASE);
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}
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enum {
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// For page_alloc, zero the returned physical page.
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ALLOC_ZERO = 1<<0,
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};
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void mem_init(void);
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void page_init(void);
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struct PageInfo *page_alloc(int alloc_flags);
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void page_free(struct PageInfo *pp);
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int page_insert(pde_t *pgdir, struct PageInfo *pp, void *va, int perm);
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void page_remove(pde_t *pgdir, void *va);
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struct PageInfo *page_lookup(pde_t *pgdir, void *va, pte_t **pte_store);
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void page_decref(struct PageInfo *pp);
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void tlb_invalidate(pde_t *pgdir, void *va);
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static inline physaddr_t
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page2pa(struct PageInfo *pp)
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{
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return (pp - pages) << PGSHIFT;
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}
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static inline struct PageInfo*
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pa2page(physaddr_t pa)
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{
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if (PGNUM(pa) >= npages)
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panic("pa2page called with invalid pa");
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return &pages[PGNUM(pa)];
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}
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static inline void*
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page2kva(struct PageInfo *pp)
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{
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return KADDR(page2pa(pp));
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}
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pte_t *pgdir_walk(pde_t *pgdir, const void *va, int create);
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#endif /* !JOS_KERN_PMAP_H */
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