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paging structs
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.gitignore
vendored
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build
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compile_flags.txt
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#include <stdint.h>
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#define PG_PRESENT 0x0000'0000'0000'0001
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#define PG_READ_WRITE 0x0000'0000'0000'0002
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#define PG_USER_SUPERVISE 0x0000'0000'0000'0004
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#define PG_WRITE_THROUGH 0x0000'0000'0000'0008
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#define PG_CACHE_DISABLE 0x0000'0000'0000'0010
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#define PG_ACCESSED 0x0000'0000'0000'0020
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#define PG_EXECUTE_DISABLE 0x8000'0000'0000'0000
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// PAGE MAP LEVEL 4 ENTRY
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struct pml4 {
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uint64_t present : 1;
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uint64_t rw : 1;
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uint64_t user_supervisor : 1;
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uint64_t write_through : 1;
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uint64_t cache_disable : 1;
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uint64_t accessed : 1;
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uint64_t _reserved : 6;
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uint64_t address : 40;
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uint64_t _reserved_2 : 11;
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uint64_t execute_disable : 1;
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};
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// PAGE DIRECTORY POINTER TABLE ENTRY
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struct pdpte {
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uint64_t present : 1;
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uint64_t rw : 1;
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uint64_t user_supervisor : 1;
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uint64_t write_through : 1;
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uint64_t cache_disable : 1;
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uint64_t accessed : 1;
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uint64_t _reserved : 1;
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uint64_t page_size : 1;
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uint64_t _reserved_2 : 2;
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uint64_t address : 40;
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uint64_t _reserved_3 : 11;
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uint64_t execute_disable : 1;
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};
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// PAGE DIRECTORY ENTRY
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struct pde {
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uint64_t present : 1;
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uint64_t rw : 1;
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uint64_t user_supervisor : 1;
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uint64_t write_through : 1;
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uint64_t cache_disable : 1;
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uint64_t accessed : 1;
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uint64_t _reserved : 1;
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uint64_t page_size : 1;
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uint64_t _reserved_2 : 2;
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uint64_t address : 40;
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uint64_t _reserved_3 : 11;
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uint64_t execute_disable : 1;
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};
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// PAGE TABLE ENTRY
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struct pte {
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uint64_t present : 1;
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uint64_t rw : 1;
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uint64_t user_supervisor : 1;
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uint64_t write_through : 1;
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uint64_t cache_disable : 1;
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uint64_t accessed : 1;
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uint64_t dirty : 1;
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uint64_t mem_type : 1;
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uint64_t global : 1;
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uint64_t _reserved : 3;
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uint64_t address : 40;
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uint64_t _reserved_2 : 7;
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uint64_t protection_key : 4;
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uint64_t execute_disable : 1;
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};
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// entry point for amd64
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void amd64_shim(void *boot_info) {
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