minix/servers/vm/region.h

47 lines
1.2 KiB
C

#ifndef _REGION_H
#define _REGION_H 1
struct phys_block {
#if SANITYCHECKS
u32_t seencount;
#endif
vir_bytes offset; /* offset from start of vir region */
vir_bytes length; /* no. of contiguous bytes */
phys_bytes phys; /* physical memory */
u8_t refcount; /* Refcount of these pages */
};
struct phys_region {
struct phys_region *next; /* next contiguous block */
struct phys_block *ph;
};
struct vir_region {
struct vir_region *next; /* next virtual region in this process */
vir_bytes vaddr; /* virtual address, offset from pagetable */
vir_bytes length; /* length in bytes */
struct phys_region *first; /* phys regions in vir region */
u16_t flags;
u32_t tag; /* Opaque to mapping code. */
};
/* Mapping flags: */
#define VR_WRITABLE 0x01 /* Process may write here. */
#define VR_NOPF 0x02 /* May not generate page faults. */
#define VR_PHYS64K 0x04 /* Physical memory must be 64k aligned. */
/* Mapping type: */
#define VR_ANON 0x10 /* Memory to be cleared and allocated */
#define VR_DIRECT 0x20 /* Mapped, but not managed by VM */
/* Tag values: */
#define VRT_NONE 0xBEEF0000
#define VRT_HEAP 0xBEEF0001
/* map_page_region flags */
#define MF_PREALLOC 0x01
#define MF_CONTIG 0x02
#endif