45 lines
1.8 KiB
C
45 lines
1.8 KiB
C
/*
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sys/vm_i386.h
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*/
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#define I386_PAGE_SIZE 4096
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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_PWT 0x008 /* Write through */
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#define I386_VM_PCD 0x010 /* Cache disable */
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#define I386_VM_ACC 0x020 /* Accessed */
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#define I386_VM_ADDR_MASK 0xFFFFF000 /* physical address */
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/* Page directory specific flags. */
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#define I386_VM_BIGPAGE 0x080 /* 4MB page */
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/* Page table specific flags. */
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#define I386_VM_DIRTY 0x040 /* Dirty */
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#define I386_VM_PTAVAIL1 0x080 /* Available for use. */
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#define I386_VM_PTAVAIL2 0x100 /* Available for use. */
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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_VM_PT_ENTRIES 1024 /* Number of entries in a page table */
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#define I386_VM_PFA_SHIFT 22 /* Page frame address shift */
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#define I386_CR0_PG 0x80000000 /* Enable paging */
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/* i386 paging 'functions' */
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#define I386_VM_PTE(v) (((v) >> I386_VM_PT_ENT_SHIFT) & I386_VM_PT_ENT_MASK)
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#define I386_VM_PDE(v) ( (v) >> I386_VM_DIR_ENT_SHIFT)
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#define I386_VM_PFA(e) ( (e) & I386_VM_ADDR_MASK)
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#define I386_VM_PAGE(v) ( (v) >> I386_VM_PFA_SHIFT)
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/* i386 pagefault error code bits */
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#define I386_VM_PFE_P 0x01 /* Pagefault caused by non-present page.
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* (otherwise protection violation.)
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*/
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#define I386_VM_PFE_W 0x02 /* Caused by write (otherwise read) */
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#define I386_VM_PFE_U 0x04 /* CPU in user mode (otherwise supervisor) */
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