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annotate cos/kernel/goto64.asm @ 19:f454e3c592dd

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Cleanup of bochs config file
author windel
date Sun, 27 Nov 2011 21:38:38 +0100
parents 6129643f5c34
children b1fed2171e1a
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
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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5 ; Loader assembly to load the 64 bits kernel just after this file.
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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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)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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8 ;org 0x100000 ; this only works with flat bin output, not with elf64 output.
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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10 bits 32 ; Start in 32 bits mode.
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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11 ; Multiboot header:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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12 ; Settings for multiboot header
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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13 PAGE_ALIGN equ 1 << 0
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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14 MEM_INFO equ 1 << 1
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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15 KLUDGE equ 1 << 16
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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16 MAGIC equ 0x1BADB002
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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17 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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18 CHECKSUM equ -(MAGIC+FLAGS)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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19
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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20 ; actual multiboot header:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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21 align 4
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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22 MultiBootHeader:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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23 dd MAGIC
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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24 dd FLAGS
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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25 dd CHECKSUM
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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26 ; 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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27 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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28 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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29 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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30 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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31 dd loader ; entry_addr: jump to here
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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32
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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33 ; GDT, three entries: one for code, one for data
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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34 GDT64:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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35 .Null: equ $ - GDT64
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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36 dq 0
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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37 .Code: equ $ - GDT64
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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38 dw 0 ; Segment limit 15-0
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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39 dw 0 ; Base 15 - 0
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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40 db 0 ; Base 23 - 16
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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41 db 10011000b ; access 0x98 (P=1 => Present)
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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42 db 00100000b ; granularity 0x20 (L=1 => long mode)
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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43 db 0
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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44 .Data: equ $ - GDT64
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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45 dw 0
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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46 dw 0
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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47 db 0
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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48 db 10010000b ; access ; 0x90
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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49 db 00000000b ; granularity 0x00
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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50 db 0
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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51 .Pointer: ; GDT pointer
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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52 dw $ - GDT64 - 1 ; Limit
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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53 dq GDT64 ; Base
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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54
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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55 ; Start of loader code:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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56 global loader
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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57 loader:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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58
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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59 ; Check that the CPU supports long mode:
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60 mov eax, 80000000h
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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61 cpuid
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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62 cmp eax, 80000000h
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63 jbe no_long_mode
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64 mov eax, 80000001h
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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65 cpuid
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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66 bt edx, 29
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67 jnc no_long_mode
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68 jmp long_mode
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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69
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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70 no_long_mode:
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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71 hlt
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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72
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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73 long_mode:
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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74
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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75 ; Prepare paging:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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76 ; PML4T - 0x1000
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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77 ; PDPT - 0x2000
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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78 ; PDT - 0x3000
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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79 ; PT - 0x4000
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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80
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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81 ; Clear the tables:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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82 mov edi, 0x1000
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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83 mov cr3, edi ; CR3 is the page table address!
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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84 xor eax, eax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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85 mov ecx, 4096
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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86 rep stosd
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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87 mov edi, cr3 ; restore edi
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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88
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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89 mov DWORD [edi], 0x2003 ; present and readwrite, points to first PDPT
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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90 add edi, 0x1000
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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91 mov DWORD [edi], 0x3003 ; present and readwrite, points to first PDT
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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92 add edi, 0x1000
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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93 mov DWORD [edi], 0x4003 ; present and readwrite, points to first PT
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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94 add edi, 0x1000
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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95
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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96 ; identity map the first two megabytes:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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97 mov ebx, 0x00000003
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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98 mov ecx, 512
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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99 ; Fill all PT entries at 0x4000
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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100 SetEntry:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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101 mov DWORD [edi], ebx
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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102 add ebx, 0x1000
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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103 add edi, 8
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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104 loop SetEntry
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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105
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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106 ; Enable paging:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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107 mov eax, cr4
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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108 or eax, 1 << 5 ; PAE-bit is bit 5
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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109 mov cr4, eax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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110
18
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111 ; Load the GDT:
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112 lgdt [GDT64.Pointer]
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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113
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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114 ; Set LM-bit (Long Mode bit):
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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115 mov ecx, 0xC0000080
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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116 rdmsr
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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117 or eax, 0x100 ; Set bit 8 (LM-bit)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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118 wrmsr
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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119
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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120 ; Enable paging:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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121 mov eax, cr0
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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122 or eax, 0x80000000 ; Set bit 31 (PG-bit)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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123 mov cr0, eax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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124
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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125
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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126 ; Jump to 64 bits kernel:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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127 jmp GDT64.Code:Realm64
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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128
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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129 bits 64
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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130
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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131 ; realm64
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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132 Realm64:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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133
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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134 ; Clear segment registers:
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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135 xor ax, ax
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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136 mov ds, ax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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137 mov es, ax
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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138 mov ss, ax
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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139 mov fs, ax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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140 mov gs, ax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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141
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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142 ; Reoad the GDT:
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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143 lgdt [GDT64.Pointer]
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
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144
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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145 ; Done!
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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146
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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147 ; Setup stack pointer:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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148 mov rsp, stackEnd
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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149 ; Put a B upper left corner
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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150 mov al, 66 ; 'B'
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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151 mov [0xb8000], al
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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152
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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153 ; Jump to code that is glued after this file
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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154 jmp einde
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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155
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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156 align 16
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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157 dataEnd:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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158 ; reserve bytes for stack:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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159 stackBegin:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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160 resb 1024
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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161 stackEnd:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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162
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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163 einde:
12
fcdae30b2782 Fixup of variable argument things
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164 # XCHG BX, BX ; bochs breakpoint
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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165
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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166 # Call kernel:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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167 extern kmain
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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168 call kmain
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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169 # Should we ever return, remain in endless loop:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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170 cli
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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171 hang:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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172 hlt
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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173 jmp hang
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
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174