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1 jermar 1
#
2071 jermar 2
# Copyright (c) 2001-2004 Jakub Jermar
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# Copyright (c) 2005-2006 Martin Decky
1 jermar 4
# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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222 decky 30
#include <arch/boot/boot.h>
506 decky 31
#include <arch/boot/memmap.h>
300 palkovsky 32
#include <arch/mm/page.h>
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#include <arch/pm.h>
222 decky 34
 
693 decky 35
#define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE)
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406 jermar 37
.section K_TEXT_START, "ax"
1 jermar 38
 
112 jermar 39
.code32
222 decky 40
.align 4
693 decky 41
.global multiboot_image_start
222 decky 42
multiboot_header:
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	.long MULTIBOOT_HEADER_MAGIC
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	.long MULTIBOOT_HEADER_FLAGS
4127 decky 45
	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)  # checksum
693 decky 46
	.long multiboot_header
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	.long unmapped_ktext_start
222 decky 48
	.long 0
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	.long 0
693 decky 50
	.long multiboot_image_start
4127 decky 51
 
222 decky 52
multiboot_image_start:
2784 jermar 53
	cld
4127 decky 54
	movl $START_STACK, %esp     # initialize stack pointer
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	lgdt KA2PA(bootstrap_gdtr)  # initialize Global Descriptor Table register
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57
	movw $gdtselector(KDATA_DES), %cx
280 decky 58
	movw %cx, %es
1639 decky 59
	movw %cx, %fs
280 decky 60
	movw %cx, %gs
4127 decky 61
	movw %cx, %ds               # kernel data + stack
280 decky 62
	movw %cx, %ss
235 decky 63
 
4127 decky 64
	jmpl $gdtselector(KTEXT_DES), $multiboot_meeting_point
271 decky 65
	multiboot_meeting_point:
66
 
4127 decky 67
	movl %eax, grub_eax         # save parameters from GRUB
2222 decky 68
	movl %ebx, grub_ebx
1639 decky 69
 
4127 decky 70
	xorl %eax, %eax
71
	cpuid
72
	cmp $0x0, %eax              # any function > 0?
2220 decky 73
	jbe pse_unsupported
4127 decky 74
	movl $0x1, %eax             # basic function code 1
2220 decky 75
	cpuid
4127 decky 76
	bt $3, %edx                 # test if PSE is supported
2220 decky 77
	jc pse_supported
4127 decky 78
 
2220 decky 79
	pse_unsupported:
80
		movl $pse_msg, %esi
81
		jmp error_halt
82
 
83
	pse_supported:
1287 vana 84
 
4127 decky 85
#include "vesa_prot.inc"
86
 
87
	# map kernel and turn paging on
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	call map_kernel
1639 decky 89
 
4127 decky 90
	# call arch_pre_main(grub_eax, grub_ebx)
3985 svoboda 91
	pushl grub_ebx
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	pushl grub_eax
4015 decky 93
	call arch_pre_main
94
 
95
	call main_bsp
96
 
4127 decky 97
	# not reached
110 jermar 98
	cli
4127 decky 99
	hlt0:
100
		hlt
101
		jmp hlt0
110 jermar 102
 
103
.global map_kernel
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map_kernel:
105 jermar 105
	#
106
	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
371 jermar 107
	# For simplicity, we map the entire 4G space.
105 jermar 108
	#
109
	movl %cr4, %ecx
4127 decky 110
	orl $(1 << 4), %ecx                 # turn PSE on
111
	andl $(~(1 << 5)), %ecx             # turn PAE off
2220 decky 112
	movl %ecx, %cr4
1 jermar 113
 
2220 decky 114
	movl $(page_directory + 0), %esi
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	movl $(page_directory + 2048), %edi
371 jermar 116
	xorl %ecx, %ecx
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	xorl %ebx, %ebx
4127 decky 118
 
119
	floop:
120
		movl $((1 << 7) | (1 << 1) | (1 << 0)), %eax
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		orl %ebx, %eax
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		movl %eax, (%esi, %ecx, 4)      # mapping 0x00000000 + %ecx * 4M => 0x00000000 + %ecx * 4M
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		movl %eax, (%edi, %ecx, 4)      # mapping 0x80000000 + %ecx * 4M => 0x00000000 + %ecx * 4M
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		addl $(4 * 1024 * 1024), %ebx
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126
		incl %ecx
127
		cmpl $512, %ecx
128
		jl floop
129
 
371 jermar 130
	movl %esi, %cr3
105 jermar 131
 
132
	movl %cr0, %ebx
4127 decky 133
	orl $(1 << 31), %ebx                # turn paging on
105 jermar 134
	movl %ebx, %cr0
110 jermar 135
	ret
105 jermar 136
 
2220 decky 137
# Print string from %esi to EGA display (in red) and halt
138
error_halt:
4127 decky 139
	movl $0xb8000, %edi         # base of EGA text mode memory
2220 decky 140
	xorl %eax, %eax
141
 
4127 decky 142
	movw $0x3d4, %dx            # read bits 8 - 15 of the cursor address
2220 decky 143
	movb $0xe, %al
144
	outb %al, %dx
145
 
146
	movw $0x3d5, %dx
147
	inb %dx, %al
148
	shl $8, %ax
149
 
4127 decky 150
	movw $0x3d4, %dx            # read bits 0 - 7 of the cursor address
2220 decky 151
	movb $0xf, %al
152
	outb %al, %dx
153
 
154
	movw $0x3d5, %dx
155
	inb %dx, %al
156
 
157
	cmp $1920, %ax
158
	jbe cursor_ok
4127 decky 159
 
160
		movw $1920, %ax         # sanity check for the cursor on the last line
161
 
2220 decky 162
	cursor_ok:
163
 
164
	movw %ax, %bx
165
	shl $1, %eax
166
	addl %eax, %edi
167
 
4127 decky 168
	movw $0x0c00, %ax           # black background, light red foreground
2220 decky 169
 
170
	ploop:
171
		lodsb
172
		cmp $0, %al
173
		je ploop_end
174
		stosw
4127 decky 175
		inc %bx
2220 decky 176
		jmp ploop
177
	ploop_end:
178
 
4127 decky 179
	movw $0x3d4, %dx            # write bits 8 - 15 of the cursor address
2220 decky 180
	movb $0xe, %al
181
	outb %al, %dx
182
 
183
	movw $0x3d5, %dx
184
	movb %bh, %al
185
	outb %al, %dx
186
 
4127 decky 187
	movw $0x3d4, %dx            # write bits 0 - 7 of the cursor address
2220 decky 188
	movb $0xf, %al
189
	outb %al, %dx
190
 
191
	movw $0x3d5, %dx
192
	movb %bl, %al
193
	outb %al, %dx
4127 decky 194
 
2220 decky 195
	cli
4127 decky 196
	hlt1:
197
		hlt
198
		jmp hlt1
2220 decky 199
 
4127 decky 200
#include "vesa_real.inc"
1287 vana 201
 
406 jermar 202
.section K_DATA_START, "aw", @progbits
105 jermar 203
 
204
.align 4096
205
page_directory:
206
	.space 4096, 0
2220 decky 207
 
2222 decky 208
grub_eax:
209
	.long 0
210
 
211
grub_ebx:
212
	.long 0
213
 
2220 decky 214
pse_msg:
2302 decky 215
	.asciz "Page Size Extension not supported. System halted."