WebSVN – HelenOS – Diff – /trunk/kernel/arch/ia32/src/boot/boot.S


#
# Copyright (C) 2001-2004 Jakub Jermar
# Copyright (C) 2005-2006 Martin Decky
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
 
#include <arch/boot/boot.h>
#include <arch/boot/memmap.h>
#include <arch/mm/page.h>
#include <arch/pm.h>
 
#define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE)
 
.section K_TEXT_START, "ax"
 
 
 
 
.code32
.align 4
.global multiboot_image_start
multiboot_header:
	.long MULTIBOOT_HEADER_MAGIC
	.long MULTIBOOT_HEADER_FLAGS
	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)	# checksum
	.long multiboot_header
	.long unmapped_ktext_start
	.long 0
	.long 0
	.long multiboot_image_start
	
multiboot_image_start:
	movl $START_STACK, %esp			# initialize stack pointer
	lgdt KA2PA(bootstrap_gdtr)		# initialize Global Descriptor Table register
 
	movw $selector(KDATA_DES), %cx
	movw %cx, %es
	movw %cx, %fs
	movw %cx, %gs
	movw %cx, %ds					# kernel data + stack
	movw %cx, %ss
	
	jmpl $selector(KTEXT_DES), $multiboot_meeting_point
	multiboot_meeting_point:
	
	pushl %ebx							# save parameters from GRUB
	pushl %eax
	
#ifdef CONFIG_FB
	mov $vesa_init, %esi
	mov $VESA_INIT_SEGMENT << 4, %edi
	mov $e_vesa_init - vesa_init, %ecx
	cld
	rep movsb
 
	mov $VESA_INIT_SEGMENT << 4, %edi
	jmpl %edi
	
	vesa_meeting_point:
	
	mov %esi, KA2PA(vesa_ph_addr)
	mov %di, KA2PA(vesa_height)
	shr $16, %edi
	mov %di, KA2PA(vesa_width)
	mov %bx, KA2PA(vesa_scanline)
	shr $16, %ebx
	mov %bx, KA2PA(vesa_bpp)
#endif	
	
	call map_kernel							# map kernel and turn paging on
	
	popl %eax
	popl %ebx
	cmpl $MULTIBOOT_LOADER_MAGIC, %eax				# compare GRUB signature
	je valid_boot
		
		xorl %ecx, %ecx							# no memory size or map available
		movl %ecx, e801memorysize
		movl %ecx, e820counter
		
		jmp invalid_boot
		
	valid_boot:
		
		movl (%ebx), %eax						# ebx = physical address of struct multiboot_info
		
		bt $0, %eax								# mbi->flags[0] (mem_lower, mem_upper valid)
		jc mem_valid
			
			xorl %ecx, %ecx
			jmp mem_invalid
			
		mem_valid:
		movl 4(%ebx), %ecx						# mbi->mem_lower
		addl 8(%ebx), %ecx						# mbi->mem_upper
		
		mem_invalid:
		movl %ecx, e801memorysize
		
		bt $3, %eax								# mbi->flags[3] (mods_count, mods_addr valid)
		jc mods_valid
			
			xorl %ecx, %ecx
			movl %ecx, init
			jmp mods_end
		
		mods_valid:
		
		movl 20(%ebx), %ecx						# mbi->mods_count
		movl %ecx, init
		
		cmpl $0, %ecx
		je mods_end
		
		movl 24(%ebx), %esi						# mbi->mods_addr
		movl $init, %edi
		
		mods_loop:
		
			movl 0(%esi), %edx					# mods->mod_start
			addl $0x80000000, %edx
			movl %edx, 4(%edi)
			
			movl 4(%esi), %edx
			subl 0(%esi), %edx					# mods->mod_end - mods->mod_start
			movl %edx, 8(%edi)
			
			addl $16, %esi
			addl $8	, %edi
			
			loop mods_loop
			
		mods_end:
		
		bt $6, %eax								# mbi->flags[6] (mmap_length, mmap_addr valid)	
		jc mmap_valid
			
			xorl %edx, %edx
			jmp mmap_invalid
			
		mmap_valid:
		movl 44(%ebx), %ecx						# mbi->mmap_length
		movl 48(%ebx), %esi						# mbi->mmap_addr
		movl $e820table, %edi
		xorl %edx, %edx
		
		mmap_loop:
			cmpl $0, %ecx
			jle mmap_end
			
			movl 4(%esi), %eax					# mmap->base_addr_low
			movl %eax, (%edi)
			
			movl 8(%esi), %eax					# mmap->base_addr_high
			movl %eax, 4(%edi)
			
			movl 12(%esi), %eax					# mmap->length_low
			movl %eax, 8(%edi)
			
			movl 16(%esi), %eax					# mmap->length_high
			movl %eax, 12(%edi)
			
			movl 20(%esi), %eax					# mmap->type
			movl %eax, 16(%edi)
			
			movl (%esi), %eax					# mmap->size
			addl $0x4, %eax
			addl %eax, %esi
			subl %eax, %ecx
			addl $MEMMAP_E820_RECORD_SIZE, %edi
			incl %edx
			jmp mmap_loop
		
		mmap_end:
		
		mmap_invalid:
		movl %edx, e820counter
		
	invalid_boot:
	
#ifdef CONFIG_SMP
	
	# copy AP bootstrap routines below 1 MB
	
	movl $BOOT_OFFSET, %esi
	movl $AP_BOOT_OFFSET, %edi
	movl $_hardcoded_unmapped_size, %ecx
	cld
	rep movsb
	
#endif
	
	call main_bsp								# never returns
 
	cli
	hlt
 
.global map_kernel
map_kernel:
	#
	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
	# For simplicity, we map the entire 4G space.
	#
	movl %cr4, %ecx
	orl $(1<<4), %ecx
	movl %ecx, %cr4							# turn PSE on
	
	movl $(page_directory+0), %esi
	movl $(page_directory+2048), %edi
	xorl %ecx, %ecx
	xorl %ebx, %ebx
0:
	movl $((1<<7)|(1<<0)), %eax
	orl %ebx, %eax
	movl %eax, (%esi,%ecx,4)					# mapping 0x00000000+%ecx*4M => 0x00000000+%ecx*4M
	movl %eax, (%edi,%ecx,4)					# mapping 0x80000000+%ecx*4M => 0x00000000+%ecx*4M
	addl $(4*1024*1024), %ebx
 
	incl %ecx
	cmpl $512, %ecx
	jl 0b
 
	movl %esi, %cr3
	
	# turn paging on
	movl %cr0, %ebx
	orl $(1<<31), %ebx
	movl %ebx, %cr0
	ret
 
#ifdef CONFIG_FB
vesa_init:
	jmp $selector(VESA_INIT_DES), $vesa_init_real - vesa_init
	
.code16
vesa_init_real:
	
	mov %cr0, %eax
	and $~1, %eax
	mov %eax, %cr0
	
	jmp $VESA_INIT_SEGMENT, $vesa_init_real2 - vesa_init
	
vesa_init_real2:
	
	mov $VESA_INIT_SEGMENT, %bx
	
	mov %bx, %es
	mov %bx, %fs
	mov %bx, %gs
	mov %bx, %ds
	mov %bx, %ss
	
	movl %esp, %eax
	movl $0x0000fffc, %esp
	movl $0x0000fffc, %ebp
	pushl %eax
	
#define VESA_INFO_SIZE 1024
 
#define VESA_MODE_LIST_PTR_OFFSET 14
#define VESA_MODE_WIDTH_OFFSET 18
#define VESA_MODE_HEIGHT_OFFSET 20
#define VESA_MODE_BPP_OFFSET 25
#define VESA_MODE_SCANLINE_OFFSET 16
#define VESA_MODE_PHADDR_OFFSET 40
 
#define VESA_END_OF_MODES 0xffff
 
#define VESA_OK 0x4f
 
#define VESA_GET_INFO 0x4f00
#define VESA_GET_MODE_INFO 0x4f01
#define VESA_SET_MODE 0x4f02
 
#define CONFIG_VESA_BPP_a 255
 
#if CONFIG_VESA_BPP == 24
#undef CONFIG_VESA_BPP_a
#define CONFIG_VESA_BPP_a 32
#endif
 
	mov $VESA_GET_INFO, %ax
	mov $e_vesa_init - vesa_init, %di
	push %di
	int $0x10
	
	pop %di
	cmp $VESA_OK, %al
	jnz 0f
	
	mov 2 + VESA_MODE_LIST_PTR_OFFSET(%di), %si
	mov %si, %gs
	mov VESA_MODE_LIST_PTR_OFFSET(%di), %si
	
	add $VESA_INFO_SIZE, %di
 
1:# Try next mode
	mov %gs:(%si), %cx
	cmp $VESA_END_OF_MODES, %cx
	jz 0f
	
	inc %si
	inc %si
	push %cx
	push %di
	push %si
	mov $VESA_GET_MODE_INFO, %ax
	int $0x10
	
	pop %si
	pop %di
	pop %cx
	cmp $VESA_OK, %al
	jnz 0f
	
	mov $CONFIG_VESA_WIDTH, %ax
	cmp VESA_MODE_WIDTH_OFFSET(%di), %ax
	jnz 1b
	
	mov $CONFIG_VESA_HEIGHT,%ax
	cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax
	jnz 1b
	
	mov $CONFIG_VESA_BPP, %al
	cmp VESA_MODE_BPP_OFFSET(%di), %al
	jz 2f
	
	mov $CONFIG_VESA_BPP_a, %al
	cmp VESA_MODE_BPP_OFFSET(%di), %al
	jnz 1b
	
2:
	
	mov %cx, %bx
	or $0xc000, %bx
	push %di
	mov $VESA_SET_MODE, %ax
	int $0x10
	
	pop %di
	cmp $VESA_OK, %al
	jnz 0f
	
	mov VESA_MODE_PHADDR_OFFSET(%di), %esi
	mov VESA_MODE_WIDTH_OFFSET(%di), %ax
	shl $16, %eax
	mov VESA_MODE_HEIGHT_OFFSET(%di), %ax
	mov VESA_MODE_BPP_OFFSET(%di), %bl
	xor %bh, %bh
	shl $16, %ebx
	mov VESA_MODE_SCANLINE_OFFSET(%di), %bx
	mov %eax, %edi
	
8:	
	
	mov %cr0, %eax
	or $1, %eax
	mov %eax, %cr0
	
	jmp 9f
9:
	
	ljmpl $selector(KTEXT_DES), $(vesa_init_protect - vesa_init + VESA_INIT_SEGMENT << 4)
 
0:# No prefered mode found
	mov $0x111, %cx
	push %di
	push %cx
	mov $VESA_GET_MODE_INFO, %ax
	int $0x10
	
	pop %cx
	pop %di
	cmp $VESA_OK, %al
	jnz 1f
	jz 2b						# Force relative jump
	
1:
	mov $0x0003, %ax
	int $0x10
	mov $0xffffffff, %edi		# EGA text mode used, because of problems with VESA
	xor %ax, %ax
	jz 8b						# Force relative jump
	
 
.code32
vesa_init_protect:
	popl %esp
 
	movw $selector(KDATA_DES), %cx
	movw %cx, %es
	movw %cx, %fs
	movw %cx, %gs
	movw %cx, %ds					# kernel data + stack
	movw %cx, %ss
	
	jmpl $selector(KTEXT_DES), $vesa_meeting_point
 
.align 4
e_vesa_init:
#endif	
 
.section K_DATA_START, "aw", @progbits
 
.align 4096
page_directory:
	.space 4096, 0
 

Rev 1787	Rev 1811
1	#	1	#
2	# Copyright (C) 2001-2004 Jakub Jermar	2	# Copyright (C) 2001-2004 Jakub Jermar
3	# Copyright (C) 2005-2006 Martin Decky	3	# Copyright (C) 2005-2006 Martin Decky
4	# All rights reserved.	4	# All rights reserved.
5	#	5	#
6	# Redistribution and use in source and binary forms, with or without	6	# Redistribution and use in source and binary forms, with or without
7	# modification, are permitted provided that the following conditions	7	# modification, are permitted provided that the following conditions
8	# are met:	8	# are met:
9	#	9	#
10	# - Redistributions of source code must retain the above copyright	10	# - Redistributions of source code must retain the above copyright
11	# notice, this list of conditions and the following disclaimer.	11	# notice, this list of conditions and the following disclaimer.
12	# - Redistributions in binary form must reproduce the above copyright	12	# - Redistributions in binary form must reproduce the above copyright
13	# notice, this list of conditions and the following disclaimer in the	13	# notice, this list of conditions and the following disclaimer in the
14	# documentation and/or other materials provided with the distribution.	14	# documentation and/or other materials provided with the distribution.
15	# - The name of the author may not be used to endorse or promote products	15	# - The name of the author may not be used to endorse or promote products
16	# derived from this software without specific prior written permission.	16	# derived from this software without specific prior written permission.
17	#	17	#
18	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	18	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	19	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	20	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	21	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	22	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	23	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	24	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	25	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	26	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	27	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28	#	28	#
29		29
30	#include <arch/boot/boot.h>	30	#include <arch/boot/boot.h>
31	#include <arch/boot/memmap.h>	31	#include <arch/boot/memmap.h>
32	#include <arch/mm/page.h>	32	#include <arch/mm/page.h>
33	#include <arch/pm.h>	33	#include <arch/pm.h>
34		34
35	#define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE)	35	#define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE)
36		36
37	.section K_TEXT_START, "ax"	37	.section K_TEXT_START, "ax"
38		38
39	KTEXT=8	-
40	KDATA=16	-
41		-
42	.code32	39	.code32
43	.align 4	40	.align 4
44	.global multiboot_image_start	41	.global multiboot_image_start
45	multiboot_header:	42	multiboot_header:
46	.long MULTIBOOT_HEADER_MAGIC	43	.long MULTIBOOT_HEADER_MAGIC
47	.long MULTIBOOT_HEADER_FLAGS	44	.long MULTIBOOT_HEADER_FLAGS
48	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum	45	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum
49	.long multiboot_header	46	.long multiboot_header
50	.long unmapped_ktext_start	47	.long unmapped_ktext_start
51	.long 0	48	.long 0
52	.long 0	49	.long 0
53	.long multiboot_image_start	50	.long multiboot_image_start
54		51
55	multiboot_image_start:	52	multiboot_image_start:
56	movl $START_STACK, %esp # initialize stack pointer	53	movl $START_STACK, %esp # initialize stack pointer
57	lgdt KA2PA(bootstrap_gdtr) # initialize Global Descriptor Table register	54	lgdt KA2PA(bootstrap_gdtr) # initialize Global Descriptor Table register
58		55
59	movw $KDATA, %cx	56	movw $selector(KDATA_DES), %cx
60	movw %cx, %es	57	movw %cx, %es
61	movw %cx, %fs	58	movw %cx, %fs
62	movw %cx, %gs	59	movw %cx, %gs
63	movw %cx, %ds # kernel data + stack	60	movw %cx, %ds # kernel data + stack
64	movw %cx, %ss	61	movw %cx, %ss
65		62
66	jmpl $KTEXT, $multiboot_meeting_point	63	jmpl $selector(KTEXT_DES), $multiboot_meeting_point
67	multiboot_meeting_point:	64	multiboot_meeting_point:
68		65
69	pushl %ebx # save parameters from GRUB	66	pushl %ebx # save parameters from GRUB
70	pushl %eax	67	pushl %eax
71		68
72	#ifdef CONFIG_FB	69	#ifdef CONFIG_FB
73	mov $vesa_init, %esi	70	mov $vesa_init, %esi
74	mov $VESA_INIT_SEGMENT << 4, %edi	71	mov $VESA_INIT_SEGMENT << 4, %edi
75	mov $e_vesa_init - vesa_init, %ecx	72	mov $e_vesa_init - vesa_init, %ecx
76	cld	73	cld
77	rep movsb	74	rep movsb
78		75
79	mov $VESA_INIT_SEGMENT << 4, %edi	76	mov $VESA_INIT_SEGMENT << 4, %edi
80	jmpl %edi	77	jmpl %edi
81		78
82	vesa_meeting_point:	79	vesa_meeting_point:
83		80
84	mov %esi, KA2PA(vesa_ph_addr)	81	mov %esi, KA2PA(vesa_ph_addr)
85	mov %di, KA2PA(vesa_height)	82	mov %di, KA2PA(vesa_height)
86	shr $16, %edi	83	shr $16, %edi
87	mov %di, KA2PA(vesa_width)	84	mov %di, KA2PA(vesa_width)
88	mov %bx, KA2PA(vesa_scanline)	85	mov %bx, KA2PA(vesa_scanline)
89	shr $16, %ebx	86	shr $16, %ebx
90	mov %bx, KA2PA(vesa_bpp)	87	mov %bx, KA2PA(vesa_bpp)
91	#endif	88	#endif
92		89
93	call map_kernel # map kernel and turn paging on	90	call map_kernel # map kernel and turn paging on
94		91
95	popl %eax	92	popl %eax
96	popl %ebx	93	popl %ebx
97	cmpl $MULTIBOOT_LOADER_MAGIC, %eax # compare GRUB signature	94	cmpl $MULTIBOOT_LOADER_MAGIC, %eax # compare GRUB signature
98	je valid_boot	95	je valid_boot
99		96
100	xorl %ecx, %ecx # no memory size or map available	97	xorl %ecx, %ecx # no memory size or map available
101	movl %ecx, e801memorysize	98	movl %ecx, e801memorysize
102	movl %ecx, e820counter	99	movl %ecx, e820counter
103		100
104	jmp invalid_boot	101	jmp invalid_boot
105		102
106	valid_boot:	103	valid_boot:
107		104
108	movl (%ebx), %eax # ebx = physical address of struct multiboot_info	105	movl (%ebx), %eax # ebx = physical address of struct multiboot_info
109		106
110	bt $0, %eax # mbi->flags[0] (mem_lower, mem_upper valid)	107	bt $0, %eax # mbi->flags[0] (mem_lower, mem_upper valid)
111	jc mem_valid	108	jc mem_valid
112		109
113	xorl %ecx, %ecx	110	xorl %ecx, %ecx
114	jmp mem_invalid	111	jmp mem_invalid
115		112
116	mem_valid:	113	mem_valid:
117	movl 4(%ebx), %ecx # mbi->mem_lower	114	movl 4(%ebx), %ecx # mbi->mem_lower
118	addl 8(%ebx), %ecx # mbi->mem_upper	115	addl 8(%ebx), %ecx # mbi->mem_upper
119		116
120	mem_invalid:	117	mem_invalid:
121	movl %ecx, e801memorysize	118	movl %ecx, e801memorysize
122		119
123	bt $3, %eax # mbi->flags[3] (mods_count, mods_addr valid)	120	bt $3, %eax # mbi->flags[3] (mods_count, mods_addr valid)
124	jc mods_valid	121	jc mods_valid
125		122
126	xorl %ecx, %ecx	123	xorl %ecx, %ecx
127	movl %ecx, init	124	movl %ecx, init
128	jmp mods_end	125	jmp mods_end
129		126
130	mods_valid:	127	mods_valid:
131		128
132	movl 20(%ebx), %ecx # mbi->mods_count	129	movl 20(%ebx), %ecx # mbi->mods_count
133	movl %ecx, init	130	movl %ecx, init
134		131
135	cmpl $0, %ecx	132	cmpl $0, %ecx
136	je mods_end	133	je mods_end
137		134
138	movl 24(%ebx), %esi # mbi->mods_addr	135	movl 24(%ebx), %esi # mbi->mods_addr
139	movl $init, %edi	136	movl $init, %edi
140		137
141	mods_loop:	138	mods_loop:
142		139
143	movl 0(%esi), %edx # mods->mod_start	140	movl 0(%esi), %edx # mods->mod_start
144	addl $0x80000000, %edx	141	addl $0x80000000, %edx
145	movl %edx, 4(%edi)	142	movl %edx, 4(%edi)
146		143
147	movl 4(%esi), %edx	144	movl 4(%esi), %edx
148	subl 0(%esi), %edx # mods->mod_end - mods->mod_start	145	subl 0(%esi), %edx # mods->mod_end - mods->mod_start
149	movl %edx, 8(%edi)	146	movl %edx, 8(%edi)
150		147
151	addl $16, %esi	148	addl $16, %esi
152	addl $8 , %edi	149	addl $8 , %edi
153		150
154	loop mods_loop	151	loop mods_loop
155		152
156	mods_end:	153	mods_end:
157		154
158	bt $6, %eax # mbi->flags[6] (mmap_length, mmap_addr valid)	155	bt $6, %eax # mbi->flags[6] (mmap_length, mmap_addr valid)
159	jc mmap_valid	156	jc mmap_valid
160		157
161	xorl %edx, %edx	158	xorl %edx, %edx
162	jmp mmap_invalid	159	jmp mmap_invalid
163		160
164	mmap_valid:	161	mmap_valid:
165	movl 44(%ebx), %ecx # mbi->mmap_length	162	movl 44(%ebx), %ecx # mbi->mmap_length
166	movl 48(%ebx), %esi # mbi->mmap_addr	163	movl 48(%ebx), %esi # mbi->mmap_addr
167	movl $e820table, %edi	164	movl $e820table, %edi
168	xorl %edx, %edx	165	xorl %edx, %edx
169		166
170	mmap_loop:	167	mmap_loop:
171	cmpl $0, %ecx	168	cmpl $0, %ecx
172	jle mmap_end	169	jle mmap_end
173		170
174	movl 4(%esi), %eax # mmap->base_addr_low	171	movl 4(%esi), %eax # mmap->base_addr_low
175	movl %eax, (%edi)	172	movl %eax, (%edi)
176		173
177	movl 8(%esi), %eax # mmap->base_addr_high	174	movl 8(%esi), %eax # mmap->base_addr_high
178	movl %eax, 4(%edi)	175	movl %eax, 4(%edi)
179		176
180	movl 12(%esi), %eax # mmap->length_low	177	movl 12(%esi), %eax # mmap->length_low
181	movl %eax, 8(%edi)	178	movl %eax, 8(%edi)
182		179
183	movl 16(%esi), %eax # mmap->length_high	180	movl 16(%esi), %eax # mmap->length_high
184	movl %eax, 12(%edi)	181	movl %eax, 12(%edi)
185		182
186	movl 20(%esi), %eax # mmap->type	183	movl 20(%esi), %eax # mmap->type
187	movl %eax, 16(%edi)	184	movl %eax, 16(%edi)
188		185
189	movl (%esi), %eax # mmap->size	186	movl (%esi), %eax # mmap->size
190	addl $0x4, %eax	187	addl $0x4, %eax
191	addl %eax, %esi	188	addl %eax, %esi
192	subl %eax, %ecx	189	subl %eax, %ecx
193	addl $MEMMAP_E820_RECORD_SIZE, %edi	190	addl $MEMMAP_E820_RECORD_SIZE, %edi
194	incl %edx	191	incl %edx
195	jmp mmap_loop	192	jmp mmap_loop
196		193
197	mmap_end:	194	mmap_end:
198		195
199	mmap_invalid:	196	mmap_invalid:
200	movl %edx, e820counter	197	movl %edx, e820counter
201		198
202	invalid_boot:	199	invalid_boot:
203		200
204	#ifdef CONFIG_SMP	201	#ifdef CONFIG_SMP
205		202
206	# copy AP bootstrap routines below 1 MB	203	# copy AP bootstrap routines below 1 MB
207		204
208	movl $BOOT_OFFSET, %esi	205	movl $BOOT_OFFSET, %esi
209	movl $AP_BOOT_OFFSET, %edi	206	movl $AP_BOOT_OFFSET, %edi
210	movl $_hardcoded_unmapped_size, %ecx	207	movl $_hardcoded_unmapped_size, %ecx
211	cld	208	cld
212	rep movsb	209	rep movsb
213		210
214	#endif	211	#endif
215		212
216	call main_bsp # never returns	213	call main_bsp # never returns
217		214
218	cli	215	cli
219	hlt	216	hlt
220		217
221	.global map_kernel	218	.global map_kernel
222	map_kernel:	219	map_kernel:
223	#	220	#
224	# Here we setup mapping for both the unmapped and mapped sections of the kernel.	221	# Here we setup mapping for both the unmapped and mapped sections of the kernel.
225	# For simplicity, we map the entire 4G space.	222	# For simplicity, we map the entire 4G space.
226	#	223	#
227	movl %cr4, %ecx	224	movl %cr4, %ecx
228	orl $(1<<4), %ecx	225	orl $(1<<4), %ecx
229	movl %ecx, %cr4 # turn PSE on	226	movl %ecx, %cr4 # turn PSE on
230		227
231	movl $(page_directory+0), %esi	228	movl $(page_directory+0), %esi
232	movl $(page_directory+2048), %edi	229	movl $(page_directory+2048), %edi
233	xorl %ecx, %ecx	230	xorl %ecx, %ecx
234	xorl %ebx, %ebx	231	xorl %ebx, %ebx
235	0:	232	0:
236	movl $((1<<7)\|(1<<0)), %eax	233	movl $((1<<7)\|(1<<0)), %eax
237	orl %ebx, %eax	234	orl %ebx, %eax
238	movl %eax, (%esi,%ecx,4) # mapping 0x00000000+%ecx4M => 0x00000000+%ecx4M	235	movl %eax, (%esi,%ecx,4) # mapping 0x00000000+%ecx4M => 0x00000000+%ecx4M
239	movl %eax, (%edi,%ecx,4) # mapping 0x80000000+%ecx4M => 0x00000000+%ecx4M	236	movl %eax, (%edi,%ecx,4) # mapping 0x80000000+%ecx4M => 0x00000000+%ecx4M
240	addl $(410241024), %ebx	237	addl $(410241024), %ebx
241		238
242	incl %ecx	239	incl %ecx
243	cmpl $512, %ecx	240	cmpl $512, %ecx
244	jl 0b	241	jl 0b
245		242
246	movl %esi, %cr3	243	movl %esi, %cr3
247		244
248	# turn paging on	245	# turn paging on
249	movl %cr0, %ebx	246	movl %cr0, %ebx
250	orl $(1<<31), %ebx	247	orl $(1<<31), %ebx
251	movl %ebx, %cr0	248	movl %ebx, %cr0
252	ret	249	ret
253		250
254	#ifdef CONFIG_FB	251	#ifdef CONFIG_FB
255	vesa_init:	252	vesa_init:
256	jmp $selector(VESA_INIT_DES), $vesa_init_real - vesa_init	253	jmp $selector(VESA_INIT_DES), $vesa_init_real - vesa_init
257		254
258	.code16	255	.code16
259	vesa_init_real:	256	vesa_init_real:
260		257
261	mov %cr0, %eax	258	mov %cr0, %eax
262	and $~1, %eax	259	and $~1, %eax
263	mov %eax, %cr0	260	mov %eax, %cr0
264		261
265	jmp $VESA_INIT_SEGMENT, $vesa_init_real2 - vesa_init	262	jmp $VESA_INIT_SEGMENT, $vesa_init_real2 - vesa_init
266		263
267	vesa_init_real2:	264	vesa_init_real2:
268		265
269	mov $VESA_INIT_SEGMENT, %bx	266	mov $VESA_INIT_SEGMENT, %bx
270		267
271	mov %bx, %es	268	mov %bx, %es
272	mov %bx, %fs	269	mov %bx, %fs
273	mov %bx, %gs	270	mov %bx, %gs
274	mov %bx, %ds	271	mov %bx, %ds
275	mov %bx, %ss	272	mov %bx, %ss
276		273
277	movl %esp, %eax	274	movl %esp, %eax
278	movl $0x0000fffc, %esp	275	movl $0x0000fffc, %esp
279	movl $0x0000fffc, %ebp	276	movl $0x0000fffc, %ebp
280	pushl %eax	277	pushl %eax
281		278
282	#define VESA_INFO_SIZE 1024	279	#define VESA_INFO_SIZE 1024
283		280
284	#define VESA_MODE_LIST_PTR_OFFSET 14	281	#define VESA_MODE_LIST_PTR_OFFSET 14
285	#define VESA_MODE_WIDTH_OFFSET 18	282	#define VESA_MODE_WIDTH_OFFSET 18
286	#define VESA_MODE_HEIGHT_OFFSET 20	283	#define VESA_MODE_HEIGHT_OFFSET 20
287	#define VESA_MODE_BPP_OFFSET 25	284	#define VESA_MODE_BPP_OFFSET 25
288	#define VESA_MODE_SCANLINE_OFFSET 16	285	#define VESA_MODE_SCANLINE_OFFSET 16
289	#define VESA_MODE_PHADDR_OFFSET 40	286	#define VESA_MODE_PHADDR_OFFSET 40
290		287
291	#define VESA_END_OF_MODES 0xffff	288	#define VESA_END_OF_MODES 0xffff
292		289
293	#define VESA_OK 0x4f	290	#define VESA_OK 0x4f
294		291
295	#define VESA_GET_INFO 0x4f00	292	#define VESA_GET_INFO 0x4f00
296	#define VESA_GET_MODE_INFO 0x4f01	293	#define VESA_GET_MODE_INFO 0x4f01
297	#define VESA_SET_MODE 0x4f02	294	#define VESA_SET_MODE 0x4f02
298		295
299	#define CONFIG_VESA_BPP_a 255	296	#define CONFIG_VESA_BPP_a 255
300		297
301	#if CONFIG_VESA_BPP == 24	298	#if CONFIG_VESA_BPP == 24
302	#undef CONFIG_VESA_BPP_a	299	#undef CONFIG_VESA_BPP_a
303	#define CONFIG_VESA_BPP_a 32	300	#define CONFIG_VESA_BPP_a 32
304	#endif	301	#endif
305		302
306	mov $VESA_GET_INFO, %ax	303	mov $VESA_GET_INFO, %ax
307	mov $e_vesa_init - vesa_init, %di	304	mov $e_vesa_init - vesa_init, %di
308	push %di	305	push %di
309	int $0x10	306	int $0x10
310		307
311	pop %di	308	pop %di
312	cmp $VESA_OK, %al	309	cmp $VESA_OK, %al
313	jnz 0f	310	jnz 0f
314		311
315	mov 2 + VESA_MODE_LIST_PTR_OFFSET(%di), %si	312	mov 2 + VESA_MODE_LIST_PTR_OFFSET(%di), %si
316	mov %si, %gs	313	mov %si, %gs
317	mov VESA_MODE_LIST_PTR_OFFSET(%di), %si	314	mov VESA_MODE_LIST_PTR_OFFSET(%di), %si
318		315
319	add $VESA_INFO_SIZE, %di	316	add $VESA_INFO_SIZE, %di
320		317
321	1:# Try next mode	318	1:# Try next mode
322	mov %gs:(%si), %cx	319	mov %gs:(%si), %cx
323	cmp $VESA_END_OF_MODES, %cx	320	cmp $VESA_END_OF_MODES, %cx
324	jz 0f	321	jz 0f
325		322
326	inc %si	323	inc %si
327	inc %si	324	inc %si
328	push %cx	325	push %cx
329	push %di	326	push %di
330	push %si	327	push %si
331	mov $VESA_GET_MODE_INFO, %ax	328	mov $VESA_GET_MODE_INFO, %ax
332	int $0x10	329	int $0x10
333		330
334	pop %si	331	pop %si
335	pop %di	332	pop %di
336	pop %cx	333	pop %cx
337	cmp $VESA_OK, %al	334	cmp $VESA_OK, %al
338	jnz 0f	335	jnz 0f
339		336
340	mov $CONFIG_VESA_WIDTH, %ax	337	mov $CONFIG_VESA_WIDTH, %ax
341	cmp VESA_MODE_WIDTH_OFFSET(%di), %ax	338	cmp VESA_MODE_WIDTH_OFFSET(%di), %ax
342	jnz 1b	339	jnz 1b
343		340
344	mov $CONFIG_VESA_HEIGHT,%ax	341	mov $CONFIG_VESA_HEIGHT,%ax
345	cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax	342	cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax
346	jnz 1b	343	jnz 1b
347		344
348	mov $CONFIG_VESA_BPP, %al	345	mov $CONFIG_VESA_BPP, %al
349	cmp VESA_MODE_BPP_OFFSET(%di), %al	346	cmp VESA_MODE_BPP_OFFSET(%di), %al
350	jz 2f	347	jz 2f
351		348
352	mov $CONFIG_VESA_BPP_a, %al	349	mov $CONFIG_VESA_BPP_a, %al
353	cmp VESA_MODE_BPP_OFFSET(%di), %al	350	cmp VESA_MODE_BPP_OFFSET(%di), %al
354	jnz 1b	351	jnz 1b
355		352
356	2:	353	2:
357		354
358	mov %cx, %bx	355	mov %cx, %bx
359	or $0xc000, %bx	356	or $0xc000, %bx
360	push %di	357	push %di
361	mov $VESA_SET_MODE, %ax	358	mov $VESA_SET_MODE, %ax
362	int $0x10	359	int $0x10
363		360
364	pop %di	361	pop %di
365	cmp $VESA_OK, %al	362	cmp $VESA_OK, %al
366	jnz 0f	363	jnz 0f
367		364
368	mov VESA_MODE_PHADDR_OFFSET(%di), %esi	365	mov VESA_MODE_PHADDR_OFFSET(%di), %esi
369	mov VESA_MODE_WIDTH_OFFSET(%di), %ax	366	mov VESA_MODE_WIDTH_OFFSET(%di), %ax
370	shl $16, %eax	367	shl $16, %eax
371	mov VESA_MODE_HEIGHT_OFFSET(%di), %ax	368	mov VESA_MODE_HEIGHT_OFFSET(%di), %ax
372	mov VESA_MODE_BPP_OFFSET(%di), %bl	369	mov VESA_MODE_BPP_OFFSET(%di), %bl
373	xor %bh, %bh	370	xor %bh, %bh
374	shl $16, %ebx	371	shl $16, %ebx
375	mov VESA_MODE_SCANLINE_OFFSET(%di), %bx	372	mov VESA_MODE_SCANLINE_OFFSET(%di), %bx
376	mov %eax, %edi	373	mov %eax, %edi
377		374
378	8:	375	8:
379		376
380	mov %cr0, %eax	377	mov %cr0, %eax
381	or $1, %eax	378	or $1, %eax
382	mov %eax, %cr0	379	mov %eax, %cr0
383		380
384	jmp 9f	381	jmp 9f
385	9:	382	9:
386		383
387	ljmpl $KTEXT, $(vesa_init_protect - vesa_init + VESA_INIT_SEGMENT << 4)	384	ljmpl $selector(KTEXT_DES), $(vesa_init_protect - vesa_init + VESA_INIT_SEGMENT << 4)
388		385
389	0:# No prefered mode found	386	0:# No prefered mode found
390	mov $0x111, %cx	387	mov $0x111, %cx
391	push %di	388	push %di
392	push %cx	389	push %cx
393	mov $VESA_GET_MODE_INFO, %ax	390	mov $VESA_GET_MODE_INFO, %ax
394	int $0x10	391	int $0x10
395		392
396	pop %cx	393	pop %cx
397	pop %di	394	pop %di
398	cmp $VESA_OK, %al	395	cmp $VESA_OK, %al
399	jnz 1f	396	jnz 1f
400	jz 2b # Force relative jump	397	jz 2b # Force relative jump
401		398
402	1:	399	1:
403	mov $0x0003, %ax	400	mov $0x0003, %ax
404	int $0x10	401	int $0x10
405	mov $0xffffffff, %edi # EGA text mode used, because of problems with VESA	402	mov $0xffffffff, %edi # EGA text mode used, because of problems with VESA
406	xor %ax, %ax	403	xor %ax, %ax
407	jz 8b # Force relative jump	404	jz 8b # Force relative jump
408		405
409		406
410	.code32	407	.code32
411	vesa_init_protect:	408	vesa_init_protect:
412	popl %esp	409	popl %esp
413		410
414	movw $KDATA, %cx	411	movw $selector(KDATA_DES), %cx
415	movw %cx, %es	412	movw %cx, %es
416	movw %cx, %fs	413	movw %cx, %fs
417	movw %cx, %gs	414	movw %cx, %gs
418	movw %cx, %ds # kernel data + stack	415	movw %cx, %ds # kernel data + stack
419	movw %cx, %ss	416	movw %cx, %ss
420		417
421	jmpl $KTEXT, $vesa_meeting_point	418	jmpl $selector(KTEXT_DES), $vesa_meeting_point
422		419
423	.align 4	420	.align 4
424	e_vesa_init:	421	e_vesa_init:
425	#endif	422	#endif
426		423
427	.section K_DATA_START, "aw", @progbits	424	.section K_DATA_START, "aw", @progbits
428		425
429	.align 4096	426	.align 4096
430	page_directory:	427	page_directory:
431	.space 4096, 0	428	.space 4096, 0
432		429

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/ia32/src/boot/boot.S @ 2071 – Rev 1787 → 1811