Mercurial > lcfOS

annotate cos/kernel/goto64.asm @ 34:8012221dd740

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Fixes for uninitialized data. This causes problems on real machines
author windel
date Mon, 16 Jan 2012 13:46:06 +0100
parents d8185ddb6c7b
children bcb3b68c8147
rev   line source
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
1 ;#!/usr/bin/nasm
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
2
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
3 ;
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
4 ; See http://wiki.osdev.org/User:Stephanvanschaik/Setting_Up_Long_Mode
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
5 ; Loader assembly to load the 64 bits kernel just after this file.
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
6
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
7 ; Assume that we are loaded at 1M (0x100000)
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
8
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
9 ; This file sets up long mode and creates paging tables.
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
10 ; Use 2 mbyte pages. Is this more efficient?
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
11
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
12 ; Intended memory map (copied from pure64), at the end of this file:
24
d8627924d40d Split up in more files and reboot command
windel
parents: 23
diff changeset
13 ; MOVED TO 0x5000!! 0x0 : IDT, 256 entries
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
14 ; 0x1000 - 0x2000 : PML4 (Page map level 4)
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
15 ; 0x2000 - 0x3000 : PDPT (page directory pointer table)
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
16 ; 0x3000 - 0x4000 : PDT (page directory table)
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
17 ; 0x4000 - 0x5000 : PT (page table)
24
d8627924d40d Split up in more files and reboot command
windel
parents: 23
diff changeset
18 ; 0x5000 - 0x6000 : IDT entries
d8627924d40d Split up in more files and reboot command
windel
parents: 23
diff changeset
19 ; 0x6000 - 0xA000 : Stack
d8627924d40d Split up in more files and reboot command
windel
parents: 23
diff changeset
20
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
21 bits 32 ; Start in 32 bits mode, as loaded by GRUB
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
22
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
23 ; Multiboot header:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
24 ; Settings for multiboot header
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
25 PAGE_ALIGN equ 1 << 0
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
26 MEM_INFO equ 1 << 1
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
27 KLUDGE equ 1 << 16
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
28 MAGIC equ 0x1BADB002
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
29 FLAGS equ PAGE_ALIGN | MEM_INFO | KLUDGE ; align and provide memory map
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
30 CHECKSUM equ -(MAGIC+FLAGS)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
31
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
32 ; actual multiboot header:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
33 align 4
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
34 MultiBootHeader:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
35 dd MAGIC
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
36 dd FLAGS
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
37 dd CHECKSUM
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
38 ; item below are present if bit 16 is set in flags
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
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
windel
parents:
diff changeset
40 dd 0x100000 ; load_addr: load address, the address to start loading
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
41 dd 0x0 ; load_end_addr: zero indicates to load whole file
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
42 dd 0x0 ; bss_end_addr: zero indicates no bss segment present
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
43 dd loader ; entry_addr: jump to here
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
44
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
45 ; 32 bits temporary GDT:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
46 align 16
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
47 gdt32:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
48 dw 0x0000, 0x0000, 0x0000, 0x0000 ; Null desciptor
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
49 dw 0xFFFF, 0x0000, 0x9A00, 0x00CF ; 32-bit code desciptor
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
50 dw 0xFFFF, 0x0000, 0x9200, 0x008F ; 32-bit data desciptor
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
51 gdt32_end:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
52
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
53 ; 32 bits gdt pointer:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
54 align 16
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
55 gdt32pointer: ; Global Descriptors Table Register
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
56 dw gdt32_end - gdt32 - 1 ; limit of GDT (size minus one)
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
57 dq gdt32 ; linear address of GDT
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
58
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
59 ; GDT, three entries: one for code, one for data
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
60 align 16
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
61 gdt64:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
62 .Null: equ $ - gdt64
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
63 dq 0
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
64 .Code: equ $ - gdt64
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
65 dw 0 ; Segment limit 15-0
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
66 dw 0 ; Base 15 - 0
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
67 db 0 ; Base 23 - 16
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
68 db 10011000b ; access 0x98 (P=1 => Present)
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
69 db 00100000b ; granularity 0x20 (L=1 => long mode)
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
70 db 0
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
71 .Data: equ $ - gdt64
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
72 dw 0
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
73 dw 0
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
74 db 0
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
75 db 10010000b ; access ; 0x90
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
76 db 00000000b ; granularity 0x00
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
77 db 0
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
78 gdt64end:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
79
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
80 ;SYS64_NULL_SEL equ $-gdt64 ; Null Segment
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
81 ; dq 0x0000000000000000
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
82 ; SYS64_CODE_SEL equ $-gdt64 ; Code segment, read/execute, nonconforming
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
83 ; dq 0x0020980000000000 ; 0x00209A0000000000
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
84 ; SYS64_DATA_SEL equ $-gdt64 ; Data segment, read/write, expand down
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
85 ; dq 0x0000900000000000 ; 0x0020920000000000
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
86 ; gdt64_end:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
87
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
88 gdt64pointer: ; GDT pointer
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
89 dw gdt64end - gdt64 - 1 ; Limit (size)
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
90 dq gdt64 ; Base
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
91
23
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
92 hltmessage:
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
93 db "Long mode not supported", 0x0
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
94
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
95 ; Start of loader code:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
96 loader:
32
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents: 24
diff changeset
97 ; here ebx contains the pointer to the multiboot header, store is for later use.
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents: 24
diff changeset
98 extern multiboot_info
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents: 24
diff changeset
99 mov [multiboot_info], ebx
34
8012221dd740 Fixes for uninitialized data. This causes problems on real machines
windel
parents: 33
diff changeset
100 xor ebx, ebx
8012221dd740 Fixes for uninitialized data. This causes problems on real machines
windel
parents: 33
diff changeset
101 mov [multiboot_info + 4], ebx ; zero the rest of 64 bits address.
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
102
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
103 ; Check that the CPU supports long mode:
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
104 mov eax, 80000000h
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
105 cpuid
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
106 cmp eax, 80000000h
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
107 jbe no_long_mode
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
108 mov eax, 80000001h
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
109 cpuid
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
110 bt edx, 29
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
111 jnc no_long_mode
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
112 jmp cpu_has_long_mode
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
113
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
114 no_long_mode:
23
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
115 ; Print long mode not supported
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
116 mov edi, 0xb8000
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
117 mov esi, hltmessage
24
d8627924d40d Split up in more files and reboot command
windel
parents: 23
diff changeset
118 xor eax, eax
23
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
119 loop1:
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
120 lodsb
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
121 mov dl, al
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
122 stosb
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
123 mov al, 0x1f
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
124 stosb
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
125 cmp dl, 0
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
126 jne loop1
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
127 hlt
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
128
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
129 cpu_has_long_mode:
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
130
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
131 lgdt [gdt32pointer] ; Reload a valid temporary 32 bits GDT, overload GRUB gdt.
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
132 mov ax, 0x10
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
133 mov ds, ax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
134 mov es, ax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
135 mov fs, ax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
136 mov gs, ax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
137 mov ss, ax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
138 jmp 8:start32 ; make sure CS is loaded.
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
139 start32:
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
140
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
141 cld ; clear direction?
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
142
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
143 ; Clear the paging tables 0x1000, 0x2000, 0x3000 and 0x4000:
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
144 mov edi, 0x1000
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
145 xor eax, eax
24
d8627924d40d Split up in more files and reboot command
windel
parents: 23
diff changeset
146 mov ecx, 0x1000
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
147 rep stosd
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
148
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
149 ; Create PML4 table:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
150 mov edi, 0x1000
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
151 mov eax, 0x2003
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
152 stosd
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
153
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
154 ; Create PDP (page directory pointer) table:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
155 mov edi, 0x2000
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
156 mov eax, 0x3003 ; PDPT entry, present and read/write
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
157 stosd
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
158
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
159 ; Create PD (page directory) table
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
160 mov edi, 0x3000
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
161 ; First entry:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
162 mov eax, 0x8F ; PD entry, present (bit 0), read write (bit 1) and bit 7, page size=2MB
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
163 stosd
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
164 xor eax, eax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
165 stosd
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
166
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
167 ; Second entry:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
168 mov eax, 0x20008f
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
169 stosd
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
170 xor eax, eax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
171 stosd
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
172
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
173 ; Third entry:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
174 mov eax, 0x40008f
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
175 stosd
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
176 xor eax, eax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
177 stosd
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
178 ; 6 MB mapped in total now.
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
179
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
180 mov edi, 0x1000 ; Set load address
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
181 mov cr3, edi ; CR3 is the PML4 base address!
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
182
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
183 ; Enable address extension:
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
184 mov eax, cr4
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
185 or eax, 1 << 5 ; PAE-bit is bit 5
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
186 mov cr4, eax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
187
24
d8627924d40d Split up in more files and reboot command
windel
parents: 23
diff changeset
188 lgdt [gdt64pointer] ; Load the GDT
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
189
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
190 ; Set LM-bit (Long Mode bit):
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
191 mov ecx, 0xC0000080
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
192 rdmsr
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
193 or eax, 0x100 ; Set bit 8 (LM-bit)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
194 wrmsr
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
195
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
196 ; Enable paging:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
197 mov eax, cr0
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
198 or eax, 0x80000000 ; Set bit 31 (PG-bit)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
199 mov cr0, eax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
200
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
201 ; Jump to 64 bits kernel:
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
202 jmp gdt64.Code:Realm64
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
203
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
204 bits 64
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
205 align 16
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
206
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
207 Realm64:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
208
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
209 ; Clear segment registers:
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
210 xor ax, ax
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
211 mov ds, ax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
212 mov es, ax
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
213 mov ss, ax
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
214 mov fs, ax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
215 mov gs, ax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
216
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
217 lgdt [gdt64pointer] ; Reload GDT in 64 bits mode
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
218
33
d8185ddb6c7b Added more interrupt handlers
windel
parents: 32
diff changeset
219 ; Test:
d8185ddb6c7b Added more interrupt handlers
windel
parents: 32
diff changeset
220 mov ax, 0x10
d8185ddb6c7b Added more interrupt handlers
windel
parents: 32
diff changeset
221 mov ds, ax
d8185ddb6c7b Added more interrupt handlers
windel
parents: 32
diff changeset
222 ; End of test
d8185ddb6c7b Added more interrupt handlers
windel
parents: 32
diff changeset
223
32
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents: 24
diff changeset
224 ; TODO: determine a good place for the kernel stack.
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
225 mov rsp, 0xA000 ; Setup stack pointer.
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
226
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
227 extern kmain
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
228 call kmain ; Call kernel in C-code
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
229