diff options
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | src/arch/amd64/shim.c | 74 |
2 files changed, 75 insertions, 0 deletions
@@ -1 +1,2 @@ build +compile_flags.txt diff --git a/src/arch/amd64/shim.c b/src/arch/amd64/shim.c index 28ba8a0..c72a59b 100644 --- a/src/arch/amd64/shim.c +++ b/src/arch/amd64/shim.c @@ -1,3 +1,77 @@ +#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) { |