[29] | 1 | /* |
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| 2 | * hal_init.c - C initialization procedure for x86. |
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| 3 | * |
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| 4 | * Copyright (c) 2017 Maxime Villard |
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| 5 | * |
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| 6 | * This file is part of ALMOS-MKH. |
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| 7 | * |
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| 8 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 9 | * under the terms of the GNU General Public License as published by |
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| 10 | * the Free Software Foundation; version 2.0 of the License. |
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| 11 | * |
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| 12 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU General Public License |
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| 18 | * along with ALMOS-MKH.; if not, write to the Free Software Foundation, |
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| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |
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| 22 | #include <hal_types.h> |
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| 23 | #include <hal_boot.h> |
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[32] | 24 | #include <hal_multiboot.h> |
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[29] | 25 | #include <hal_segmentation.h> |
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| 26 | |
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| 27 | #include <memcpy.h> |
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| 28 | #include <thread.h> |
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| 29 | #include <string.h> |
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| 30 | #include <process.h> |
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| 31 | #include <printk.h> |
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| 32 | #include <vmm.h> |
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| 33 | #include <core.h> |
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| 34 | #include <cluster.h> |
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| 35 | |
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| 36 | void x86_printf(char *s, ...); |
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| 37 | |
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| 38 | static void gdt_create(); |
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| 39 | static void idt_create(); |
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| 40 | void cpu_attach(); |
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| 41 | |
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[32] | 42 | |
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| 43 | struct multiboot_info mb_info __in_kdata; |
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| 44 | char mb_loader_name[PAGE_SIZE] __in_kdata; |
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| 45 | uint8_t mb_mmap[PAGE_SIZE] __in_kdata; |
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| 46 | |
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| 47 | #define offsetof(type, member) __builtin_offsetof(type, member) |
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| 48 | |
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| 49 | |
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[29] | 50 | /* -------------------------------------------------------------------------- */ |
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| 51 | |
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[32] | 52 | static void |
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| 53 | dump_memmap() |
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| 54 | { |
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| 55 | size_t mmap_length = mb_info.mi_mmap_length; |
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| 56 | uint8_t *mmap_addr = (uint8_t *)&mb_mmap; |
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| 57 | size_t i; |
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| 58 | |
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| 59 | if (!(mb_info.mi_flags & MULTIBOOT_INFO_HAS_MMAP)) |
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| 60 | x86_printf("SHIT!!\n"); |
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| 61 | |
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| 62 | i = 0; |
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| 63 | while (i < mmap_length) { |
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| 64 | struct multiboot_mmap *mm; |
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| 65 | |
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| 66 | mm = (struct multiboot_mmap *)(mmap_addr + i); |
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| 67 | |
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| 68 | x86_printf("-> [%Z, %Z] %s\n", mm->mm_base_addr, |
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| 69 | mm->mm_base_addr + mm->mm_length, |
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| 70 | (mm->mm_type == 1) ? "ram" : "rsv" ); |
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| 71 | |
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| 72 | i += mm->mm_size + 4; |
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| 73 | } |
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| 74 | } |
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| 75 | |
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[29] | 76 | void init_x86_64(paddr_t firstpa) |
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| 77 | { |
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| 78 | x86_printf("[+] init_x86_64 called\n"); |
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| 79 | |
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| 80 | extern uint64_t __kernel_end; |
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[32] | 81 | x86_printf("__kernel_end: %Z\n", (uint64_t)&__kernel_end); |
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[29] | 82 | |
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| 83 | /* Create the global structures */ |
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| 84 | gdt_create(); |
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| 85 | x86_printf("[+] gdt_create called\n"); |
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| 86 | |
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| 87 | idt_create(); |
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| 88 | x86_printf("[+] idt_create called\n"); |
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| 89 | |
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| 90 | /* Attach cpu0 */ |
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| 91 | cpu_attach(); |
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| 92 | x86_printf("[+] cpu_attach called\n"); |
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| 93 | |
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[32] | 94 | x86_printf("[+] bootloader: %s\n", mb_loader_name); |
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| 95 | |
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| 96 | dump_memmap(); |
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| 97 | |
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| 98 | x86_printf("[+] dump finished\n"); |
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| 99 | |
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[29] | 100 | char *buf = NULL; |
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| 101 | *buf = (char)0x01; |
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| 102 | |
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| 103 | int m = 0; |
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| 104 | int v = 1 / m; |
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| 105 | |
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| 106 | x86_printf("ALIVE!\n"); |
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| 107 | |
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| 108 | while (1); |
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| 109 | } |
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| 110 | |
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| 111 | /* -------------------------------------------------------------------------- */ |
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| 112 | |
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| 113 | uint8_t gdtstore[PAGE_SIZE] __in_kdata; |
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| 114 | uint8_t idtstore[PAGE_SIZE] __in_kdata; |
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| 115 | struct tss cpu0_tss __in_kdata; |
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| 116 | uint8_t cpu0_intr_stack[STKSIZE] __in_kdata; |
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| 117 | uint8_t cpu0_dbfl_stack[STKSIZE] __in_kdata; |
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| 118 | uint8_t cpu0_nmfl_stack[STKSIZE] __in_kdata; |
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| 119 | |
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| 120 | static void |
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| 121 | setregion(struct region_descriptor *rd, void *base, uint16_t limit) |
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| 122 | { |
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| 123 | rd->rd_limit = limit; |
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| 124 | rd->rd_base = (uint64_t)base; |
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| 125 | } |
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| 126 | |
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| 127 | /* -------------------------------------------------------------------------- */ |
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| 128 | |
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| 129 | static void |
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| 130 | gdt_set_memseg(struct gdt_memseg *sd, void *base, size_t limit, |
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| 131 | int type, int dpl, int gran, int is64) |
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| 132 | { |
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| 133 | sd->sd_lolimit = (unsigned)limit; |
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| 134 | sd->sd_lobase = (unsigned long)base; |
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| 135 | sd->sd_type = type; |
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| 136 | sd->sd_dpl = dpl; |
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| 137 | sd->sd_p = 1; |
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| 138 | sd->sd_hilimit = (unsigned)limit >> 16; |
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| 139 | sd->sd_avl = 0; |
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| 140 | sd->sd_long = is64; |
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| 141 | sd->sd_def32 = 0; |
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| 142 | sd->sd_gran = gran; |
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| 143 | sd->sd_hibase = (unsigned long)base >> 24; |
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| 144 | } |
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| 145 | |
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| 146 | static void |
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| 147 | gdt_set_sysseg(struct gdt_sysseg *sd, void *base, size_t limit, |
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| 148 | int type, int dpl, int gran) |
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| 149 | { |
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| 150 | memset(sd, 0, sizeof *sd); |
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| 151 | sd->sd_lolimit = (unsigned)limit; |
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| 152 | sd->sd_lobase = (uint64_t)base; |
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| 153 | sd->sd_type = type; |
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| 154 | sd->sd_dpl = dpl; |
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| 155 | sd->sd_p = 1; |
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| 156 | sd->sd_hilimit = (unsigned)limit >> 16; |
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| 157 | sd->sd_gran = gran; |
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| 158 | sd->sd_hibase = (uint64_t)base >> 24; |
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| 159 | } |
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| 160 | |
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| 161 | static void gdt_create() |
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| 162 | { |
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| 163 | memset(&gdtstore, 0, PAGE_SIZE); |
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| 164 | |
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| 165 | /* Flat segments */ |
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| 166 | gdt_set_memseg(GDT_ADDR_MEM(gdtstore, GDT_KCODE_SEL), 0, |
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| 167 | 0xfffff, SDT_MEMERA, SEL_KPL, 1, 1); |
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| 168 | gdt_set_memseg(GDT_ADDR_MEM(gdtstore, GDT_KDATA_SEL), 0, |
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| 169 | 0xfffff, SDT_MEMRWA, SEL_KPL, 1, 1); |
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| 170 | gdt_set_memseg(GDT_ADDR_MEM(gdtstore, GDT_UCODE_SEL), 0, |
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| 171 | 0xfffff, SDT_MEMERA, SEL_UPL, 1, 1); |
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| 172 | gdt_set_memseg(GDT_ADDR_MEM(gdtstore, GDT_UDATA_SEL), 0, |
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| 173 | 0xfffff, SDT_MEMRWA, SEL_UPL, 1, 1); |
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| 174 | } |
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| 175 | |
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| 176 | void cpu_load_gdt() |
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| 177 | { |
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| 178 | struct region_descriptor region; |
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| 179 | setregion(®ion, &gdtstore, PAGE_SIZE - 1); |
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| 180 | lgdt(®ion); |
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| 181 | } |
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| 182 | |
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| 183 | /* -------------------------------------------------------------------------- */ |
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| 184 | |
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| 185 | static void |
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| 186 | idt_set_seg(struct idt_seg *seg, void *func, int ist, int type, int dpl, int sel) |
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| 187 | { |
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| 188 | seg->gd_looffset = (uint64_t)func & 0xffff; |
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| 189 | seg->gd_selector = sel; |
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| 190 | seg->gd_ist = ist; |
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| 191 | seg->gd_type = type; |
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| 192 | seg->gd_dpl = dpl; |
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| 193 | seg->gd_p = 1; |
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| 194 | seg->gd_hioffset = (uint64_t)func >> 16; |
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| 195 | seg->gd_zero = 0; |
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| 196 | seg->gd_xx1 = 0; |
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| 197 | seg->gd_xx2 = 0; |
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| 198 | seg->gd_xx3 = 0; |
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| 199 | } |
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| 200 | |
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| 201 | static void idt_create() |
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| 202 | { |
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| 203 | extern uint64_t x86_traps[]; |
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| 204 | struct idt_seg *idt; |
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| 205 | size_t i; |
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| 206 | |
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| 207 | idt = (struct idt_seg *)&idtstore; |
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| 208 | for (i = 0; i < NCPUIDT; i++) { |
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[31] | 209 | idt_set_seg(&idt[i], (void *)x86_traps[i], 0, SDT_SYS386IGT, |
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[29] | 210 | SEL_KPL, GDT_FIXED_SEL(GDT_KCODE_SEL, SEL_KPL)); |
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| 211 | } |
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| 212 | } |
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| 213 | |
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| 214 | void cpu_load_idt() |
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| 215 | { |
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| 216 | struct region_descriptor region; |
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| 217 | setregion(®ion, &idtstore, PAGE_SIZE - 1); |
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| 218 | lidt(®ion); |
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| 219 | } |
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| 220 | |
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| 221 | /* -------------------------------------------------------------------------- */ |
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| 222 | |
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| 223 | /* |
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| 224 | * The gdt bitmap must be per-cluster. |
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| 225 | */ |
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| 226 | int tss_alloc(struct tss *tss) |
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| 227 | { |
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| 228 | int slot; |
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| 229 | |
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| 230 | /* Once we have proper SMP support, we will change that */ |
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| 231 | slot = GDT_CPU0TSS_SEL; |
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| 232 | |
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| 233 | gdt_set_sysseg(GDT_ADDR_SYS(gdtstore, slot), tss, |
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| 234 | sizeof(*tss) - 1, SDT_SYS386TSS, SEL_KPL, 0); |
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| 235 | |
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| 236 | return GDT_DYNAM_SEL(slot, SEL_KPL); |
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| 237 | } |
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| 238 | |
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| 239 | void cpu_create_tss() |
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| 240 | { |
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| 241 | struct tss *tss = &cpu0_tss; |
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| 242 | int sel; |
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| 243 | |
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| 244 | /* Create the tss */ |
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| 245 | memset(tss, 0, sizeof(*tss)); |
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| 246 | tss->tss_iobase = IOMAP_INVALOFF << 16; |
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| 247 | tss->tss_ist[0] = (uint64_t)cpu0_intr_stack + STKSIZE; |
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| 248 | tss->tss_ist[1] = (uint64_t)cpu0_dbfl_stack + STKSIZE; |
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| 249 | tss->tss_ist[2] = (uint64_t)cpu0_nmfl_stack + STKSIZE; |
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| 250 | sel = tss_alloc(tss); |
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| 251 | |
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| 252 | /* Load it */ |
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| 253 | ltr(sel); |
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| 254 | } |
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| 255 | |
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| 256 | /* -------------------------------------------------------------------------- */ |
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| 257 | |
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| 258 | void cpu_attach() |
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| 259 | { |
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| 260 | cpu_load_gdt(); |
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| 261 | cpu_load_idt(); |
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| 262 | cpu_create_tss(); |
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| 263 | } |
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| 264 | |
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