61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
#include "Tier0/paging.h"
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#include "Tier0/kstdio.h"
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#include "types.h"
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u32 g_kernel_page_directory[1024] __attribute__ ((aligned (4096)));
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u32 g_low_page_table[1024] __attribute__ ((aligned (4096)));
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/*u8 paging_get_physical(u32 Virtual, u32 *Physical)
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{
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u16 Index =
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u32 DirectoryEntry = g_kernel_page_directory[Index];
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u8 TablePresent = DirectoryEntry & 0b1;
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if (!TablePresent)
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return 0;
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u32 TableAddress = 0;
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TableAddress |= (DirectoryEntry & 0xFFFFF000);
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u32 Table = *((u32 *) &TableAddress);
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u8 PagePresent = DirectoryEntry &
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}*/
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void paging_dump_directory(void)
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{
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for (u32 i = 0; i < 10; i++)
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{
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kprintf("[i] Virtual 0x%X - 0x%X, Entry 0x%X.\n", i * 4096 * 1024, (i + 1) * 4096 * 1024, g_kernel_page_directory[i] & 0xFFFFF000);
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}
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}
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void paging_init_simple(void)
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{
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void *RealKernelPageDir = (u8 *)g_kernel_page_directory + 0x40000000;
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void *RealLowPageTable = (u8 *)g_low_page_table + 0x40000000;
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for (u16 i = 0; i < 1024; i++)
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{
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g_low_page_table[i] = (i * 4096) | 0x03;
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g_kernel_page_directory[i] = 0;
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}
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kprintf("[i] Page Directory Physical: 0x%X, Virtual: 0x%X.\n", RealKernelPageDir, g_kernel_page_directory);
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kprintf("[i] Low Page Table Physical: 0x%X, Virtual: 0x%X.\n", RealLowPageTable, g_low_page_table);
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g_kernel_page_directory[0] = (u32)RealLowPageTable | 0x03;
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g_kernel_page_directory[768] = (u32)RealLowPageTable | 0x03;
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paging_dump_directory();
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__asm volatile ( "mov %0, %%eax\n"
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"mov %%eax, %%cr3\n"
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"mov %%cr0, %%eax\n"
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"orl $0x80000000, %%eax\n"
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"mov %%eax, %%cr0\n" :: "m" (RealKernelPageDir));
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}
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