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annotate cos/kernel/goto64.asm @ 32:3a6a9b929db0

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Added initial ramdisk and some virtual file system functions
author windel
date Fri, 13 Jan 2012 18:18:17 +0100
parents d8627924d40d
children d8185ddb6c7b
rev   line source
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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1 ;#!/usr/bin/nasm
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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2
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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3 ;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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4 ; See http://wiki.osdev.org/User:Stephanvanschaik/Setting_Up_Long_Mode
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5 ; Loader assembly to load the 64 bits kernel just after this file.
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6
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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7 ; Assume that we are loaded at 1M (0x100000)
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8
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9 ; This file sets up long mode and creates paging tables.
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10 ; Use 2 mbyte pages. Is this more efficient?
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11
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12 ; Intended memory map (copied from pure64), at the end of this file:
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d8627924d40d Split up in more files and reboot command
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13 ; MOVED TO 0x5000!! 0x0 : IDT, 256 entries
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14 ; 0x1000 - 0x2000 : PML4 (Page map level 4)
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15 ; 0x2000 - 0x3000 : PDPT (page directory pointer table)
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16 ; 0x3000 - 0x4000 : PDT (page directory table)
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17 ; 0x4000 - 0x5000 : PT (page table)
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d8627924d40d Split up in more files and reboot command
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18 ; 0x5000 - 0x6000 : IDT entries
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19 ; 0x6000 - 0xA000 : Stack
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20
20
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21 bits 32 ; Start in 32 bits mode, as loaded by GRUB
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22
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92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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23 ; Multiboot header:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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24 ; Settings for multiboot header
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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25 PAGE_ALIGN equ 1 << 0
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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26 MEM_INFO equ 1 << 1
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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27 KLUDGE equ 1 << 16
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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28 MAGIC equ 0x1BADB002
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29 FLAGS equ PAGE_ALIGN | MEM_INFO | KLUDGE ; align and provide memory map
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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30 CHECKSUM equ -(MAGIC+FLAGS)
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31
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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32 ; actual multiboot header:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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33 align 4
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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34 MultiBootHeader:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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35 dd MAGIC
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36 dd FLAGS
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37 dd CHECKSUM
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38 ; item below are present if bit 16 is set in flags
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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39 dd MultiBootHeader ; physical address in file of header (will be 0x100000 if put at start)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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40 dd 0x100000 ; load_addr: load address, the address to start loading
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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41 dd 0x0 ; load_end_addr: zero indicates to load whole file
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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42 dd 0x0 ; bss_end_addr: zero indicates no bss segment present
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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43 dd loader ; entry_addr: jump to here
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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44
20
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45 ; 32 bits temporary GDT:
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46 align 16
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47 gdt32:
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48 dw 0x0000, 0x0000, 0x0000, 0x0000 ; Null desciptor
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49 dw 0xFFFF, 0x0000, 0x9A00, 0x00CF ; 32-bit code desciptor
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50 dw 0xFFFF, 0x0000, 0x9200, 0x008F ; 32-bit data desciptor
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51 gdt32_end:
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52
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53 ; 32 bits gdt pointer:
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54 align 16
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55 gdt32pointer: ; Global Descriptors Table Register
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56 dw gdt32_end - gdt32 - 1 ; limit of GDT (size minus one)
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57 dq gdt32 ; linear address of GDT
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58
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59 ; GDT, three entries: one for code, one for data
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60 align 16
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61 gdt64:
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62 .Null: equ $ - gdt64
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6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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63 dq 0
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64 .Code: equ $ - gdt64
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65 dw 0 ; Segment limit 15-0
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66 dw 0 ; Base 15 - 0
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67 db 0 ; Base 23 - 16
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68 db 10011000b ; access 0x98 (P=1 => Present)
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69 db 00100000b ; granularity 0x20 (L=1 => long mode)
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70 db 0
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71 .Data: equ $ - gdt64
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92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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72 dw 0
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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73 dw 0
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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74 db 0
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75 db 10010000b ; access ; 0x90
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76 db 00000000b ; granularity 0x00
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92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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77 db 0
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78 gdt64end:
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79
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80 ;SYS64_NULL_SEL equ $-gdt64 ; Null Segment
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81 ; dq 0x0000000000000000
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82 ; SYS64_CODE_SEL equ $-gdt64 ; Code segment, read/execute, nonconforming
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83 ; dq 0x0020980000000000 ; 0x00209A0000000000
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84 ; SYS64_DATA_SEL equ $-gdt64 ; Data segment, read/write, expand down
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85 ; dq 0x0000900000000000 ; 0x0020920000000000
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86 ; gdt64_end:
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87
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88 gdt64pointer: ; GDT pointer
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89 dw gdt64end - gdt64 - 1 ; Limit (size)
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90 dq gdt64 ; Base
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92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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91
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92 hltmessage:
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93 db "Long mode not supported", 0x0
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94
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95 ; Start of loader code:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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96 loader:
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97 ; here ebx contains the pointer to the multiboot header, store is for later use.
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98 extern multiboot_info
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99 mov [multiboot_info], ebx
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92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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100
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101 ; Check that the CPU supports long mode:
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102 mov eax, 80000000h
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103 cpuid
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104 cmp eax, 80000000h
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105 jbe no_long_mode
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106 mov eax, 80000001h
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107 cpuid
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108 bt edx, 29
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109 jnc no_long_mode
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110 jmp cpu_has_long_mode
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111
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112 no_long_mode:
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113 ; Print long mode not supported
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114 mov edi, 0xb8000
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115 mov esi, hltmessage
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116 xor eax, eax
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117 loop1:
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118 lodsb
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119 mov dl, al
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120 stosb
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121 mov al, 0x1f
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122 stosb
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123 cmp dl, 0
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124 jne loop1
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125 hlt
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126
20
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127 cpu_has_long_mode:
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128
20
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129 lgdt [gdt32pointer] ; Reload a valid temporary 32 bits GDT, overload GRUB gdt.
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130 mov ax, 0x10
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131 mov ds, ax
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132 mov es, ax
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133 mov fs, ax
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134 mov gs, ax
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135 mov ss, ax
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136 jmp 8:start32 ; make sure CS is loaded.
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137 start32:
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138
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139 cld ; clear direction?
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140
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141 ; Clear the paging tables 0x1000, 0x2000, 0x3000 and 0x4000:
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142 mov edi, 0x1000
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143 xor eax, eax
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d8627924d40d Split up in more files and reboot command
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144 mov ecx, 0x1000
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145 rep stosd
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146
20
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147 ; Create PML4 table:
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148 mov edi, 0x1000
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149 mov eax, 0x2003
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150 stosd
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151
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152 ; Create PDP (page directory pointer) table:
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153 mov edi, 0x2000
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154 mov eax, 0x3003 ; PDPT entry, present and read/write
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155 stosd
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156
20
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157 ; Create PD (page directory) table
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158 mov edi, 0x3000
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159 ; First entry:
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160 mov eax, 0x8F ; PD entry, present (bit 0), read write (bit 1) and bit 7, page size=2MB
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161 stosd
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162 xor eax, eax
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163 stosd
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164
20
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165 ; Second entry:
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166 mov eax, 0x20008f
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167 stosd
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168 xor eax, eax
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169 stosd
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170
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171 ; Third entry:
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172 mov eax, 0x40008f
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173 stosd
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174 xor eax, eax
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175 stosd
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176 ; 6 MB mapped in total now.
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177
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178 mov edi, 0x1000 ; Set load address
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179 mov cr3, edi ; CR3 is the PML4 base address!
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180
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181 ; Enable address extension:
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182 mov eax, cr4
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183 or eax, 1 << 5 ; PAE-bit is bit 5
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184 mov cr4, eax
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185
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186 lgdt [gdt64pointer] ; Load the GDT
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187
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188 ; Set LM-bit (Long Mode bit):
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189 mov ecx, 0xC0000080
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190 rdmsr
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191 or eax, 0x100 ; Set bit 8 (LM-bit)
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192 wrmsr
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193
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194 ; Enable paging:
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195 mov eax, cr0
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196 or eax, 0x80000000 ; Set bit 31 (PG-bit)
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197 mov cr0, eax
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198
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199 ; Jump to 64 bits kernel:
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200 jmp gdt64.Code:Realm64
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201
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202 bits 64
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203 align 16
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204
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205 Realm64:
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206
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207 ; Clear segment registers:
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208 xor ax, ax
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209 mov ds, ax
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210 mov es, ax
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211 mov ss, ax
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212 mov fs, ax
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213 mov gs, ax
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214
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215 lgdt [gdt64pointer] ; Reload GDT in 64 bits mode
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216
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217 ; TODO: determine a good place for the kernel stack.
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218 mov rsp, 0xA000 ; Setup stack pointer.
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219
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220 extern kmain
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221 call kmain ; Call kernel in C-code
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222