diff options
Diffstat (limited to 'arch/x86_64/page_directory.c')
| -rw-r--r-- | arch/x86_64/page_directory.c | 119 |
1 files changed, 0 insertions, 119 deletions
diff --git a/arch/x86_64/page_directory.c b/arch/x86_64/page_directory.c deleted file mode 100644 index 7030b05..0000000 --- a/arch/x86_64/page_directory.c +++ /dev/null @@ -1,119 +0,0 @@ -#include "arch/x86_64/page.h" -#include "arch/x86_64/object.h" -#include "device/processor.h" -#include "print.h" -#include "memory.h" -#include "object.h" -#include "string.h" -#include "jove.h" -#include <stdint.h> - -physptr_t s_kpbase(void); - -#if defined(__limine__) - -#include "boot/limine/limine.h" -static struct limine_kernel_address_request s_kaddr_req = { - .id = LIMINE_KERNEL_ADDRESS_REQUEST -}; - -physptr_t s_kpbase(void) { return s_kaddr_req.response->physical_base; } - -#endif - -physptr_t -vmem_tophys_koff(virtptr_t v) -{ - return v - (physptr_t)&_kernel_start + s_kpbase(); -} - -#define IDENTITY_BASE 0xFFFF800000000000 -void* -vmem_phys_tovirt(physptr_t p) -{ - return (void*)(p + IDENTITY_BASE); -} - -uintptr_t vmem_ident_tophys(void *vptr) -{ - return ((uintptr_t)vptr) - IDENTITY_BASE; -} - -void* -pmle_get_page(pmle_t entry) -{ - uintptr_t pptr = entry.paddr << 12; - return vmem_phys_tovirt(pptr); -} - -uint8_t -pmle_level(pmle_t entry) -{ - return entry.osflg; -} - -__attribute__((aligned(0x1000))) pmle_t s_kernel_pml4[512]; // Page L4 -__attribute__((aligned(0x1000))) pmle_t s_kernel_pml3[512]; // Page L3 -__attribute__((aligned(0x1000))) pmle_t s_kernel_pml2[512]; // Page directory -__attribute__((aligned(0x1000))) pmle_t s_kernel_pml1[512]; // Page table - -__attribute__((aligned(0x1000))) pmle_t s_idmap_pml3[512]; -__attribute__((aligned(0x1000))) pmle_t s_idmap_pml2[512]; - -void -vmem_setup(void) -{ - memset(s_kernel_pml4, 0, 0x1000); - memset(s_kernel_pml3, 0, 0x1000); - memset(s_kernel_pml2, 0, 0x1000); - memset(s_kernel_pml1, 0, 0x1000); - - memset(s_idmap_pml3, 0, 0x1000); - memset(s_idmap_pml2, 0, 0x1000); - - virtptr_t kernel_start = (virtptr_t)&_kernel_start; - virtptr_t kernel_end = (virtptr_t)&_kernel_end; - - size_t kernel_size = kernel_end - kernel_start; - size_t kernel_size_pages = (kernel_size / 0x1000) + 1; - - physptr_t kernel_pml4_base = vmem_tophys_koff((virtptr_t)&s_kernel_pml4); - physptr_t kernel_pml3_base = vmem_tophys_koff((virtptr_t)&s_kernel_pml3); - physptr_t kernel_pml2_base = vmem_tophys_koff((virtptr_t)&s_kernel_pml2); - physptr_t kernel_pml1_base = vmem_tophys_koff((virtptr_t)&s_kernel_pml1); - - physptr_t idmap_pml3_base = vmem_tophys_koff((virtptr_t)&s_idmap_pml3); - physptr_t idmap_pml2_base = vmem_tophys_koff((virtptr_t)&s_idmap_pml2); - - processor_t *processor = processor_current(); - processor->pdir = kernel_pml4_base; - - //Map memory identity pages. - s_kernel_pml4[256].value = idmap_pml3_base | 2 | 1; - s_idmap_pml3[0].value = idmap_pml2_base | 2 | 1; - for(int i = 0; i < 512; i++) { - s_idmap_pml2[i].value = (i * 0x1000 * 512) | 0x80 | 2 | 1; - } - - //Map the kernel to himem. - - pmli_t kernel_pml3_i = PML_I_FOR_LAYER(kernel_start, 3); - pmli_t kernel_pml2_i = PML_I_FOR_LAYER(kernel_start, 2); - pmli_t kernel_pml1_ib = PML_I_FOR_LAYER(kernel_start, 1); - pmli_t kernel_pml1_ie = PML_I_FOR_LAYER(kernel_end, 1) + 1; - - s_kernel_pml4[511].value = kernel_pml3_base | 2 | 1; - s_kernel_pml3[kernel_pml3_i].value = kernel_pml2_base | 2 | 1; - s_kernel_pml2[kernel_pml2_i].value = kernel_pml1_base | 2 | 1; - for(pmli_t i = kernel_pml1_ib; i < kernel_pml1_ie; i++) { - s_kernel_pml1[i].value = ((i * 0x1000) + s_kpbase()) | 3; - } - - __asm__ volatile("mov %0, %%cr3":: "r"(kernel_pml4_base)); - - //Add page mapping object to init directory. - _initDirectory.entries[INIT_OBJECT_PAGEMAP] = (objdir_entry_t) { - .type = KO_MEMORY_MAPPING, - .data = kernel_pml4_base - }; -} |
