85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
#ifndef __MM__VMM_H__
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#define __MM__VMM_H__
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#include <stdint.h>
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#include <stdbool.h>
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#if defined (__x86_64__) || defined (__i386__)
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#define VMM_FLAG_WRITE ((uint64_t)1 << 1)
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#define VMM_FLAG_NOEXEC ((uint64_t)1 << 63)
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#define VMM_FLAG_FB ((uint64_t)0)
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#define VMM_MAX_LEVEL 3
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#define PAGING_MODE_X86_64_4LVL 0
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#define PAGING_MODE_X86_64_5LVL 1
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#define paging_mode_va_bits(mode) ((mode) ? 57 : 48)
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static inline uint64_t paging_mode_higher_half(int paging_mode) {
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if (paging_mode == PAGING_MODE_X86_64_5LVL) {
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return 0xff00000000000000;
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} else {
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return 0xffff800000000000;
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}
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}
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typedef struct {
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int levels;
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void *top_level;
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} pagemap_t;
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enum page_size {
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Size4KiB,
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Size2MiB,
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Size1GiB
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};
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pagemap_t new_pagemap(int lv);
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void map_page(pagemap_t pagemap, uint64_t virt_addr, uint64_t phys_addr, uint64_t flags, enum page_size page_size);
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#elif defined (__aarch64__)
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// We use fake flags here because these don't properly map onto the
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// aarch64 flags.
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#define VMM_FLAG_WRITE ((uint64_t)1 << 0)
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#define VMM_FLAG_NOEXEC ((uint64_t)1 << 1)
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#define VMM_FLAG_FB ((uint64_t)1 << 2)
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#define VMM_MAX_LEVEL 3
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#define PAGING_MODE_AARCH64_4LVL 0
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#define PAGING_MODE_AARCH64_5LVL 1
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#define paging_mode_va_bits(mode) ((mode) ? 57 : 48)
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static inline uint64_t paging_mode_higher_half(int paging_mode) {
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if (paging_mode == PAGING_MODE_AARCH64_5LVL) {
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return 0xff00000000000000;
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} else {
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return 0xffff800000000000;
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}
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}
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typedef struct {
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int levels;
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void *top_level[2];
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} pagemap_t;
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enum page_size {
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Size4KiB,
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Size2MiB,
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Size1GiB
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};
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void vmm_assert_4k_pages(void);
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pagemap_t new_pagemap(int lv);
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void map_page(pagemap_t pagemap, uint64_t virt_addr, uint64_t phys_addr, uint64_t flags, enum page_size page_size);
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#else
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#error Unknown architecture
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#endif
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#endif
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