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paging structs

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Freya Murphy 2024-01-27 00:10:26 -05:00
parent e4fc6902b7
commit 7559e847a7
Signed by: freya
GPG key ID: 744AB800E383AE52
2 changed files with 75 additions and 0 deletions
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.gitignore vendored
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build
compile_flags.txt

74
src/arch/amd64/shim.c
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#include <stdint.h>
#define PG_PRESENT 0x0000'0000'0000'0001
#define PG_READ_WRITE 0x0000'0000'0000'0002
#define PG_USER_SUPERVISE 0x0000'0000'0000'0004
#define PG_WRITE_THROUGH 0x0000'0000'0000'0008
#define PG_CACHE_DISABLE 0x0000'0000'0000'0010
#define PG_ACCESSED 0x0000'0000'0000'0020
#define PG_EXECUTE_DISABLE 0x8000'0000'0000'0000
// PAGE MAP LEVEL 4 ENTRY
struct pml4 {
uint64_t present : 1;
uint64_t rw : 1;
uint64_t user_supervisor : 1;
uint64_t write_through : 1;
uint64_t cache_disable : 1;
uint64_t accessed : 1;
uint64_t _reserved : 6;
uint64_t address : 40;
uint64_t _reserved_2 : 11;
uint64_t execute_disable : 1;
};
// PAGE DIRECTORY POINTER TABLE ENTRY
struct pdpte {
uint64_t present : 1;
uint64_t rw : 1;
uint64_t user_supervisor : 1;
uint64_t write_through : 1;
uint64_t cache_disable : 1;
uint64_t accessed : 1;
uint64_t _reserved : 1;
uint64_t page_size : 1;
uint64_t _reserved_2 : 2;
uint64_t address : 40;
uint64_t _reserved_3 : 11;
uint64_t execute_disable : 1;
};
// PAGE DIRECTORY ENTRY
struct pde {
uint64_t present : 1;
uint64_t rw : 1;
uint64_t user_supervisor : 1;
uint64_t write_through : 1;
uint64_t cache_disable : 1;
uint64_t accessed : 1;
uint64_t _reserved : 1;
uint64_t page_size : 1;
uint64_t _reserved_2 : 2;
uint64_t address : 40;
uint64_t _reserved_3 : 11;
uint64_t execute_disable : 1;
};
// PAGE TABLE ENTRY
struct pte {
uint64_t present : 1;
uint64_t rw : 1;
uint64_t user_supervisor : 1;
uint64_t write_through : 1;
uint64_t cache_disable : 1;
uint64_t accessed : 1;
uint64_t dirty : 1;
uint64_t mem_type : 1;
uint64_t global : 1;
uint64_t _reserved : 3;
uint64_t address : 40;
uint64_t _reserved_2 : 7;
uint64_t protection_key : 4;
uint64_t execute_disable : 1;
};
// entry point for amd64
void amd64_shim(void *boot_info) {