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