mirror of https://github.com/tailix/libkernaux.git
192 lines
5.8 KiB
C
192 lines
5.8 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 <kernaux/macro.h>
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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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#include <kernaux/macro/packing_start.run>
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// Global or local descriptor table entry
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// TODO: validate this according to spec
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struct KernAux_Arch_I386_DTE {
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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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KERNAUX_PACKING_ATTR;
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KERNAUX_STATIC_TEST_STRUCT_SIZE(KernAux_Arch_I386_DTE, 8);
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/**
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* @brief Task state segment
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* @see The manual, page 132, figure 7-1
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*/
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struct KernAux_Arch_I386_TSS {
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// 0x00
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uint16_t prev_tss;
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uint16_t _zero0;
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// 0x04
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uint32_t esp0;
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uint16_t ss0;
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uint16_t _zero1;
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uint32_t esp1;
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uint16_t ss1;
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uint16_t _zero2;
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uint32_t esp2;
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uint16_t ss2;
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uint16_t _zero3;
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// 0x1c
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uint32_t cr3;
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uint32_t eip;
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uint32_t eflags;
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uint32_t eax;
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uint32_t ecx;
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uint32_t edx;
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uint32_t ebx;
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uint32_t esp;
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uint32_t ebp;
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uint32_t esi;
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uint32_t edi;
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// 0x48
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uint16_t es;
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uint16_t _zero4;
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uint16_t cs;
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uint16_t _zero5;
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uint16_t ss;
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uint16_t _zero6;
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uint16_t ds;
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uint16_t _zero7;
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uint16_t fs;
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uint16_t _zero8;
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uint16_t gs;
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uint16_t _zero9;
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uint16_t ldt;
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uint16_t _zero10;
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// 0x64
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uint16_t _zero11;
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uint16_t io_map_base;
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}
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KERNAUX_PACKING_ATTR;
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KERNAUX_STATIC_TEST_STRUCT_SIZE(KernAux_Arch_I386_TSS, 104);
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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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KERNAUX_PACKING_ATTR;
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KERNAUX_STATIC_TEST_STRUCT_SIZE(KernAux_Arch_I386_PDE, 4);
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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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KERNAUX_PACKING_ATTR;
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KERNAUX_STATIC_TEST_STRUCT_SIZE(KernAux_Arch_I386_PDE, 4);
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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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KERNAUX_PACKING_ATTR;
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KERNAUX_STATIC_TEST_STRUCT_SIZE(KernAux_Arch_I386_PageDir, KERNAUX_ARCH_I386_PAGE_SIZE);
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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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KERNAUX_PACKING_ATTR;
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KERNAUX_STATIC_TEST_STRUCT_SIZE(KernAux_Arch_I386_PageTable, KERNAUX_ARCH_I386_PAGE_SIZE);
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#include <kernaux/macro/packing_end.run>
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#ifdef __cplusplus
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}
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#endif
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#endif
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