jos/kern/pmap.h

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2018-09-12 11:55:07 -07:00
/* See COPYRIGHT for copyright information. */
#ifndef JOS_KERN_PMAP_H
#define JOS_KERN_PMAP_H
#ifndef JOS_KERNEL
# error "This is a JOS kernel header; user programs should not #include it"
#endif
#include <inc/memlayout.h>
#include <inc/assert.h>
extern char bootstacktop[], bootstack[];
extern struct PageInfo *pages;
extern size_t npages;
extern pde_t *kern_pgdir;
/* This macro takes a kernel virtual address -- an address that points above
* KERNBASE, where the machine's maximum 256MB of physical memory is mapped --
* and returns the corresponding physical address. It panics if you pass it a
* non-kernel virtual address.
*/
#define PADDR(kva) _paddr(__FILE__, __LINE__, kva)
static inline physaddr_t
_paddr(const char *file, int line, void *kva)
{
if ((uint32_t)kva < KERNBASE)
_panic(file, line, "PADDR called with invalid kva %08lx", kva);
return (physaddr_t)kva - KERNBASE;
}
/* This macro takes a physical address and returns the corresponding kernel
* virtual address. It panics if you pass an invalid physical address. */
#define KADDR(pa) _kaddr(__FILE__, __LINE__, pa)
static inline void*
_kaddr(const char *file, int line, physaddr_t pa)
{
if (PGNUM(pa) >= npages)
_panic(file, line, "KADDR called with invalid pa %08lx", pa);
return (void *)(pa + KERNBASE);
}
enum {
// For page_alloc, zero the returned physical page.
ALLOC_ZERO = 1<<0,
};
void mem_init(void);
void page_init(void);
struct PageInfo *page_alloc(int alloc_flags);
void page_free(struct PageInfo *pp);
int page_insert(pde_t *pgdir, struct PageInfo *pp, void *va, int perm);
void page_remove(pde_t *pgdir, void *va);
struct PageInfo *page_lookup(pde_t *pgdir, void *va, pte_t **pte_store);
void page_decref(struct PageInfo *pp);
void tlb_invalidate(pde_t *pgdir, void *va);
static inline physaddr_t
page2pa(struct PageInfo *pp)
{
return (pp - pages) << PGSHIFT;
}
static inline struct PageInfo*
pa2page(physaddr_t pa)
{
if (PGNUM(pa) >= npages)
panic("pa2page called with invalid pa");
return &pages[PGNUM(pa)];
}
static inline void*
page2kva(struct PageInfo *pp)
{
return KADDR(page2pa(pp));
}
pte_t *pgdir_walk(pde_t *pgdir, const void *va, int create);
#endif /* !JOS_KERN_PMAP_H */