mirror of
https://github.com/tailix/libkernaux.git
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122 lines
4.4 KiB
C
122 lines
4.4 KiB
C
#ifndef KERNAUX_INCLUDED_ARCH_I386
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#define KERNAUX_INCLUDED_ARCH_I386
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#define KERNAUX_ARCH_I386_PAGE_SIZE (1024 * 4) // 4 KiB
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#define KERNAUX_ARCH_I386_PAGE_BIG_SIZE (1024 * 1024 * 4) // 4 MiB
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#define KERNAUX_ARCH_I386_PAGE_DIR_ENTRIES_COUNT 1024
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#define KERNAUX_ARCH_I386_PAGE_TABLE_ENTRIES_COUNT 1024
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#define KERNAUX_ARCH_I386_PAGES_COUNT_MAX (1024 * 1024)
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#define KERNAUX_ARCH_I386_ADDR_TO_PDE_INDEX(addr) \
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((((uint32_t)addr) & 0xffffffff) >> 22)
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#define KERNAUX_ARCH_I386_ADDR_TO_PTE_INDEX(addr) \
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(((((uint32_t)addr) & 0xffffffff) >> 12) & 0x3ff)
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#define KERNAUX_ARCH_I386_ADDR_TO_PDE_ADDR(addr) \
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((((uint32_t)addr) & 0xffffffff) >> 12)
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#define KERNAUX_ARCH_I386_ADDR_TO_PTE_ADDR(addr) \
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KERNAUX_ARCH_I386_ADDR_TO_PDE_ADDR(addr)
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// CR0 bits
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#define KERNAUX_ARCH_I386_CR0_PE ((uint32_t)0x00000001) // 0: Protected Mode Enable
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#define KERNAUX_ARCH_I386_CR0_MP ((uint32_t)0x00000002) // 1: Monitor co-processor
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#define KERNAUX_ARCH_I386_CR0_EM ((uint32_t)0x00000004) // 2: x87 FPU Emulation
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#define KERNAUX_ARCH_I386_CR0_TS ((uint32_t)0x00000008) // 3: Task switched
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#define KERNAUX_ARCH_I386_CR0_ET ((uint32_t)0x00000010) // 4: Extension type
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#define KERNAUX_ARCH_I386_CR0_NE ((uint32_t)0x00000020) // 5: Numeric error
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#define KERNAUX_ARCH_I386_CR0_WP ((uint32_t)0x00010000) // 16: Write protect
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#define KERNAUX_ARCH_I386_CR0_AM ((uint32_t)0x00040000) // 18: Alignment mask
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#define KERNAUX_ARCH_I386_CR0_NW ((uint32_t)0x20000000) // 29: Not-write trough
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#define KERNAUX_ARCH_I386_CR0_CD ((uint32_t)0x40000000) // 30: Cache disable
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#define KERNAUX_ARCH_I386_CR0_PG ((uint32_t)0x80000000) // 31: Paging
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// Some CR4 bits
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#define KERNAUX_ARCH_I386_CR4_VME ((uint32_t)0x00000001) // 0: Virtual 8086 Mode Extensions
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#define KERNAUX_ARCH_I386_CR4_PVI ((uint32_t)0x00000002) // 1: Protected-mode Virtual Interrupts
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#define KERNAUX_ARCH_I386_CR4_TSD ((uint32_t)0x00000004) // 2: Time Stamp Disable
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#define KERNAUX_ARCH_I386_CR4_DE ((uint32_t)0x00000008) // 3: Debugging Extensions
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#define KERNAUX_ARCH_I386_CR4_PSE ((uint32_t)0x00000010) // 4: Page Size Extension
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#define KERNAUX_ARCH_I386_CR4_PAE ((uint32_t)0x00000020) // 5: Physical Address Extension
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#define KERNAUX_ARCH_I386_CR4_MCE ((uint32_t)0x00000040) // 6: Machine Check Exception
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#define KERNAUX_ARCH_I386_CR4_PGE ((uint32_t)0x00000080) // 7: Page Global Enabled
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// TODO: bits 8-31
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// Global descriptor table entry
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// TODO: validate this according to spec
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struct KernAux_Arch_I386_GDTE {
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unsigned limit_low : 16;
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unsigned base_low : 24;
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unsigned accessed : 1;
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unsigned read_write : 1;
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unsigned conforming_expand_down : 1;
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unsigned code : 1;
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unsigned always_1 : 1;
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unsigned DPL : 2;
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unsigned present : 1;
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unsigned limit_high : 4;
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unsigned available : 1;
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unsigned always_0 : 1;
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unsigned big : 1;
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unsigned gran : 1;
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unsigned base_high : 8;
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}
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__attribute__((packed));
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// Page directory entry
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// TODO: validate this according to spec
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struct KernAux_Arch_I386_PDE {
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unsigned present : 1;
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unsigned writable : 1;
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unsigned user : 1;
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unsigned write_through : 1;
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unsigned cache_disabled : 1;
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unsigned accessed : 1;
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unsigned available0 : 1;
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unsigned page_size : 1;
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unsigned available1 : 4;
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unsigned addr : 20;
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}
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__attribute__((packed));
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// Page table entry
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// TODO: validate this according to spec
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struct KernAux_Arch_I386_PTE {
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unsigned present : 1;
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unsigned writable : 1;
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unsigned user : 1;
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unsigned write_through : 1;
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unsigned cache_disabled : 1;
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unsigned accessed : 1;
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unsigned dirty : 1;
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unsigned attr_table : 1;
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unsigned global : 1;
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unsigned available : 3;
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unsigned addr : 20;
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}
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__attribute__((packed));
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// Page directory
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struct KernAux_Arch_I386_PageDir {
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struct KernAux_Arch_I386_PDE pdes[KERNAUX_ARCH_I386_PAGE_DIR_ENTRIES_COUNT];
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}
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__attribute__((packed));
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// Page table
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struct KernAux_Arch_I386_PageTable {
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struct KernAux_Arch_I386_PTE ptes[KERNAUX_ARCH_I386_PAGE_TABLE_ENTRIES_COUNT];
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}
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__attribute__((packed));
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#ifdef __cplusplus
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}
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#endif
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#endif
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