52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
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#ifndef _PAGETABLE_H
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#define _PAGETABLE_H 1
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#include <stdint.h>
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#include <machine/vm.h>
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#include "vm.h"
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/* An ARM pagetable. */
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typedef struct {
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/* Directory entries in VM addr space - root of page table. */
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u32_t *pt_dir; /* 16KB aligned (ARM_VM_DIR_ENTRIES) */
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u32_t pt_dir_phys; /* physical address of pt_dir */
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/* Pointers to page tables in VM address space. */
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u32_t *pt_pt[ARM_VM_DIR_ENTRIES];
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/* When looking for a hole in virtual address space, start
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* looking here. This is in linear addresses, i.e.,
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* not as the process sees it but the position in the page
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* page table. This is just a hint.
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*/
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u32_t pt_virtop;
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} pt_t;
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/* Mapping flags. */
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#define PTF_WRITE ARM_VM_PTE_RW
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#define PTF_READ ARM_VM_PTE_RO
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#define PTF_PRESENT ARM_VM_PTE_PRESENT
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#define PTF_SUPER ARM_VM_PTE_SUPER
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#define PTF_USER ARM_VM_PTE_USER
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#define PTF_NOCACHE ARM_VM_PTE_DEVICE
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#define PTF_CACHEWB ARM_VM_PTE_WB
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#define PTF_CACHEWT ARM_VM_PTE_WT
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#define PTF_SHARE ARM_VM_PTE_SHAREABLE
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/* For arch-specific PT routines to check if no bits outside
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* the regular flags are set.
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*/
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#define PTF_ALLFLAGS (PTF_READ|PTF_WRITE|PTF_PRESENT|PTF_SUPER|PTF_USER|PTF_NOCACHE|PTF_CACHEWB|PTF_CACHEWT|PTF_SHARE)
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#if SANITYCHECKS
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#define PT_SANE(p) { pt_sanitycheck((p), __FILE__, __LINE__); }
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#else
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#define PT_SANE(p)
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#endif
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#endif
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