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