minix/include/sys/vm.h
2006-01-12 14:32:42 +00:00

30 lines
880 B
C

/*
sys/vm.h
*/
#define PAGE_SIZE 4096
/* MIOCMAP */
struct mapreq
{
void *base;
size_t size;
off_t offset;
int readonly;
};
/* i386 paging constants */
#define I386_VM_PRESENT 0x001 /* Page is present */
#define I386_VM_WRITE 0x002 /* Read/write access allowed */
#define I386_VM_USER 0x004 /* User access allowed */
#define I386_VM_PWT 0x008 /* Write through */
#define I386_VM_PCD 0x010 /* Cache disable */
#define I386_VM_ADDR_MASK 0xFFFFF000 /* physical address */
#define I386_VM_PT_ENT_SIZE 4 /* Size of a page table entry */
#define I386_VM_DIR_ENTRIES 1024 /* Number of entries in a page dir */
#define I386_VM_DIR_ENT_SHIFT 22 /* Shift to get entry in page dir. */
#define I386_VM_PT_ENT_SHIFT 12 /* Shift to get entry in page table */
#define I386_VM_PT_ENT_MASK 0x3FF /* Mask to get entry in page table */
#define I386_CR0_PG 0x80000000 /* Enable paging */