Mercurial > lcfOS

annotate cos/kernel/goto64.asm @ 23:5dd47d6eebac

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added ubersimple malloc algorithm
author windel
date Thu, 01 Dec 2011 21:42:59 +0100
parents b1fed2171e1a
children d8627924d40d
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:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
13 ; 0x0 : IDT, 256 entries
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)
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
18 ; 0x5000 - 0xA000 : Stack
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
19
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
20 bits 32 ; Start in 32 bits mode, as loaded by GRUB
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
21
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
22 ; Multiboot header:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
23 ; Settings for multiboot header
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
24 PAGE_ALIGN equ 1 << 0
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
25 MEM_INFO equ 1 << 1
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
26 KLUDGE equ 1 << 16
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
27 MAGIC equ 0x1BADB002
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
28 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
29 CHECKSUM equ -(MAGIC+FLAGS)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
30
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
31 ; actual multiboot header:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
32 align 4
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
33 MultiBootHeader:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
34 dd MAGIC
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
35 dd FLAGS
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
36 dd CHECKSUM
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
37 ; 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
38 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
39 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
40 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
41 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
42 dd loader ; entry_addr: jump to here
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
43
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
44 ; 32 bits temporary GDT:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
45 align 16
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
46 gdt32:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
47 dw 0x0000, 0x0000, 0x0000, 0x0000 ; Null desciptor
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
48 dw 0xFFFF, 0x0000, 0x9A00, 0x00CF ; 32-bit code desciptor
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
49 dw 0xFFFF, 0x0000, 0x9200, 0x008F ; 32-bit data desciptor
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
50 gdt32_end:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
51
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
52 ; 32 bits gdt pointer:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
53 align 16
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
54 gdt32pointer: ; Global Descriptors Table Register
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
55 dw gdt32_end - gdt32 - 1 ; limit of GDT (size minus one)
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
56 dq gdt32 ; linear address of GDT
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
57
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
58 ; GDT, three entries: one for code, one for data
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
59 align 16
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
60 gdt64:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
61 .Null: equ $ - gdt64
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
62 dq 0
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
63 .Code: equ $ - gdt64
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
64 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
65 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
66 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
67 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
68 db 00100000b ; granularity 0x20 (L=1 => long mode)
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
69 db 0
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
70 .Data: equ $ - gdt64
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
71 dw 0
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 db 0
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
74 db 10010000b ; access ; 0x90
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
75 db 00000000b ; granularity 0x00
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
76 db 0
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
77 gdt64end:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
78
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
79 ;SYS64_NULL_SEL equ $-gdt64 ; Null Segment
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
80 ; dq 0x0000000000000000
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
81 ; SYS64_CODE_SEL equ $-gdt64 ; Code segment, read/execute, nonconforming
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
82 ; dq 0x0020980000000000 ; 0x00209A0000000000
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
83 ; SYS64_DATA_SEL equ $-gdt64 ; Data segment, read/write, expand down
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
84 ; dq 0x0000900000000000 ; 0x0020920000000000
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
85 ; gdt64_end:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
86
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
87 gdt64pointer: ; GDT pointer
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
88 dw gdt64end - gdt64 - 1 ; Limit (size)
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
89 dq gdt64 ; Base
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
90
23
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
91 hltmessage:
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
92 db "Long mode not supported", 0x0
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
93
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
94 ; Start of loader code:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
95 loader:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
96
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
97 ; 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
98 mov eax, 80000000h
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
99 cpuid
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
100 cmp eax, 80000000h
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
101 jbe no_long_mode
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
102 mov eax, 80000001h
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
103 cpuid
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
104 bt edx, 29
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
105 jnc no_long_mode
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
106 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
107
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
108 no_long_mode:
23
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
109 ; Print long mode not supported
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
110 mov edi, 0xb8000
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
111 mov esi, hltmessage
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
112 xor eax,eax
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
113 loop1:
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
114 lodsb
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
115 mov dl, al
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
116 stosb
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
117 mov al, 0x1f
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
118 stosb
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
119 cmp dl, 0
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
120 jne loop1
5dd47d6eebac Added ubersimple malloc algorithm
windel
parents: 20
diff changeset
121
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
122 hlt
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
123
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
124 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
125
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
126 lgdt [gdt32pointer] ; Reload a valid temporary 32 bits GDT, overload GRUB gdt.
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
127 mov ax, 0x10
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
128 mov ds, ax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
129 mov es, ax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
130 mov fs, ax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
131 mov gs, ax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
132 mov ss, ax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
133 jmp 8:start32 ; make sure CS is loaded.
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
134 start32:
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
135
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
136 cld ; clear direction?
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
137
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
138 ; 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
139 mov edi, 0x1000
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
140 xor eax, eax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
141 mov ecx, 4096
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
142 rep stosd
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
143
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
144 ; Create PML4 table:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
145 mov edi, 0x1000
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
146 mov eax, 0x2003
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
147 stosd
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
148
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
149 ; Create PDP (page directory pointer) table:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
150 mov edi, 0x2000
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
151 mov eax, 0x3003 ; PDPT entry, present and read/write
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
152 stosd
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
153
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
154 ; Create PD (page directory) table
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
155 mov edi, 0x3000
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
156 ; First entry:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
157 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
158 stosd
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
159 xor eax, eax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
160 stosd
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
161
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
162 ; Second entry:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
163 mov eax, 0x20008f
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
164 stosd
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
165 xor eax, eax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
166 stosd
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
167
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
168 ; Third entry:
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
169 mov eax, 0x40008f
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
170 stosd
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
171 xor eax, eax
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
172 stosd
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
173 ; 6 MB mapped in total now.
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
174
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
175 mov edi, 0x1000 ; Set load address
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
176 mov cr3, edi ; CR3 is the PML4 base address!
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
177
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
178 ; Enable address extension:
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
179 mov eax, cr4
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
180 or eax, 1 << 5 ; PAE-bit is bit 5
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
181 mov cr4, eax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
182
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
183 ; Load the GDT:
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
184 lgdt [gdt64pointer]
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
185
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
186 ; Set LM-bit (Long Mode bit):
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
187 mov ecx, 0xC0000080
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
188 rdmsr
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
189 or eax, 0x100 ; Set bit 8 (LM-bit)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
190 wrmsr
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
191
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
192 ; Enable paging:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
193 mov eax, cr0
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
194 or eax, 0x80000000 ; Set bit 31 (PG-bit)
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
195 mov cr0, eax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
196
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
197 ; Jump to 64 bits kernel:
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
198 jmp gdt64.Code:Realm64
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
199
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
200 bits 64
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
201 align 16
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
202
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
203 Realm64:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
204
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
205 ; Clear segment registers:
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
206 xor ax, ax
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
207 mov ds, ax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
208 mov es, ax
18
6129643f5c34 Fixed interrupt issue, ds, es, ss, fs and gs were not initialized to 0
windel
parents: 12
diff changeset
209 mov ss, ax
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
210 mov fs, ax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
211 mov gs, ax
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
212
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
213 lgdt [gdt64pointer] ; Reload GDT in 64 bits mode
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
214
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
215 mov rsp, 0xA000 ; Setup stack pointer.
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
216
12
fcdae30b2782 Fixup of variable argument things
windel
parents: 9
diff changeset
217 # XCHG BX, BX ; bochs breakpoint
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
218
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
219 extern kmain
20
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
220 call kmain ; Call kernel in C-code
b1fed2171e1a Now working with 2 MB pages
windel
parents: 18
diff changeset
221
9
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
222 # Should we ever return, remain in endless loop:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
223 cli
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
224 hang:
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
225 hlt
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
226 jmp hang
92ace1ca50a8 64 bits kernel without interrupts but with printf in C
windel
parents:
diff changeset
227