WebSVN – HelenOS-historic – Diff – /kernel/trunk/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"
 KTEXT=8
 KDATA=16
 .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 $KDATA, %cx
 	movw %cx, %es
-	movw %cx, %gs
 	movw %cx, %fs
+	movw %cx, %gs
 	movw %cx, %ds					# kernel data + stack
 	movw %cx, %ss
 	jmpl $KTEXT, $multiboot_meeting_point
 	multiboot_meeting_point:
 	pushl %ebx							# save parameters from GRUB
 	pushl %eax
 #ifdef CONFIG_FB
-	mov $vesa_init,%esi;
+	mov $vesa_init, %esi
-	mov $VESA_INIT_SEGMENT<<4,%edi;
+	mov $VESA_INIT_SEGMENT << 4, %edi
-	mov $e_vesa_init-vesa_init,%ecx;
+	mov $e_vesa_init - vesa_init, %ecx
-	cld;
+	cld
-	rep movsb;
+	rep movsb
-	mov $VESA_INIT_SEGMENT<<4,%edi;
+	mov $VESA_INIT_SEGMENT << 4, %edi
-	call *%edi;
+	jmpl %edi
+	vesa_meeting_point:
-	mov %esi,KA2PA(vesa_ph_addr);
+	mov %esi, KA2PA(vesa_ph_addr)
-	mov %di,KA2PA(vesa_height);
+	mov %di, KA2PA(vesa_height)
-	shr $16,%edi;
+	shr $16, %edi
-	mov %di,KA2PA(vesa_width);
+	mov %di, KA2PA(vesa_width)
-	mov %bx,KA2PA(vesa_scanline);
+	mov %bx, KA2PA(vesa_scanline)
-	shr $16,%ebx;
+	shr $16, %ebx
-	mov %bx,KA2PA(vesa_bpp);
+	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
 :
 	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;
+	jmp $selector(VESA_INIT_DES), $vesa_init_real - vesa_init
 .code16
 vesa_init_real:
-	mov %cr0,%eax;
+	mov %cr0, %eax
-	and $~1,%eax;
+	and $~1, %eax
-	mov %eax,%cr0;
+	mov %eax, %cr0
-	jmp $VESA_INIT_SEGMENT,$vesa_init_real2-vesa_init;
+	jmp $VESA_INIT_SEGMENT, $vesa_init_real2 - vesa_init
 vesa_init_real2:
+	mov $VESA_INIT_SEGMENT, %bx
-	mov %esp,%ebp;
+	mov %bx, %es
-	mov %ss,%cx;
+	mov %bx, %fs
-	mov $VESA_INIT_SEGMENT,%bx;
-	mov %bx,%ss;
+	mov %bx, %gs
-	mov $0x0000fffc,%esp;
-	push %ds;
+	mov %bx, %ds
-	push %es;
-	push %fs;
-	push %gs;
-	push %ebp;
-	push %cx;
+	mov %bx, %ss
-	mov %bx,%ds;
+	movl %esp, %eax
-	mov %bx,%es;
+	movl $0x0000fffc, %esp
-	mov %bx,%fs;
+	movl $0x0000fffc, %ebp
-	mov %bx,%gs;
+	pushl %eax
-	mov $vesa_idt-vesa_init,%ebx;
-	lidtl (%ebx);
 #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
+#if CONFIG_VESA_BPP == 24
 #undef CONFIG_VESA_BPP_a
 #define CONFIG_VESA_BPP_a 32
 #endif
-	mov $VESA_GET_INFO,%ax;
+	mov $VESA_GET_INFO, %ax
-	mov $e_vesa_init-vesa_init,%di
+	mov $e_vesa_init - vesa_init, %di
-	push %di;
+	push %di
-	int $0x10;
+	int $0x10
-	pop %di;
+	pop %di
-	cmp $VESA_OK,%al;
+	cmp $VESA_OK, %al
-	jnz 0f;
+	jnz 0f
-	mov 2+VESA_MODE_LIST_PTR_OFFSET(%di),%si;
+	mov 2 + VESA_MODE_LIST_PTR_OFFSET(%di), %si
-	mov %si,%gs;
+	mov %si, %gs
-	mov VESA_MODE_LIST_PTR_OFFSET(%di),%si;
+	mov VESA_MODE_LIST_PTR_OFFSET(%di), %si
-	add $VESA_INFO_SIZE,%di;
+	add $VESA_INFO_SIZE, %di
 :# Try next mode
-	mov %gs:(%si),%cx;
+	mov %gs:(%si), %cx
-	cmp $VESA_END_OF_MODES,%cx;
+	cmp $VESA_END_OF_MODES, %cx
-	jz 0f;
+	jz 0f
-	inc %si;
+	inc %si
-	inc %si;
+	inc %si
-	push %cx;
+	push %cx
-	push %di;
+	push %di
-	push %si;
+	push %si
-	mov $VESA_GET_MODE_INFO,%ax;
+	mov $VESA_GET_MODE_INFO, %ax
-	int $0x10;
+	int $0x10
-	pop %si;
+	pop %si
-	pop %di;
+	pop %di
-	pop %cx;
+	pop %cx
-	cmp $VESA_OK,%al;
+	cmp $VESA_OK, %al
-	jnz 0f;
+	jnz 0f
-	mov $CONFIG_VESA_WIDTH,%ax;
+	mov $CONFIG_VESA_WIDTH, %ax
-	cmp VESA_MODE_WIDTH_OFFSET(%di),%ax;
+	cmp VESA_MODE_WIDTH_OFFSET(%di), %ax
-	jnz 1b;
+	jnz 1b
-	mov $CONFIG_VESA_HEIGHT,%ax;
+	mov $CONFIG_VESA_HEIGHT,%ax
-	cmp VESA_MODE_HEIGHT_OFFSET(%di),%ax;
+	cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax
-	jnz 1b;
+	jnz 1b
-	mov $CONFIG_VESA_BPP,%al;
+	mov $CONFIG_VESA_BPP, %al
-	cmp VESA_MODE_BPP_OFFSET(%di),%al;
+	cmp VESA_MODE_BPP_OFFSET(%di), %al
-	jz 2f;
+	jz 2f
-	mov $CONFIG_VESA_BPP_a,%al;
+	mov $CONFIG_VESA_BPP_a, %al
-	cmp VESA_MODE_BPP_OFFSET(%di),%al;
+	cmp VESA_MODE_BPP_OFFSET(%di), %al
-	jnz 1b;
+	jnz 1b
 :
-	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;
+	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
 :
-	mov %cr0,%eax;
+	mov %cr0, %eax
-	or $1,%eax;
+	or $1, %eax
-	mov %eax,%cr0;
+	mov %eax,%cr0
-	jmp 9f;
+	jmp 9f
 :
+	ljmpl $KTEXT, $(vesa_init_protect - vesa_init + VESA_INIT_SEGMENT << 4)
-	pop %cx;
-	pop %ebp;
-	pop %gs;
-	pop %fs;
-	pop %es;
-	pop %ds;
-	mov %cx,%ss;
-	mov %ebp,%esp;
-	ljmpl $KTEXT,$(vesa_init_protect-vesa_init+VESA_INIT_SEGMENT<<4);
-:	#Error no Prefered mode found
+:# No prefered mode found
-	mov $0x111,%cx;
+	mov $0x111, %cx
-	push %di;
+	push %di
-	push %cx;
+	push %cx
-	mov $VESA_GET_MODE_INFO,%ax;
+	mov $VESA_GET_MODE_INFO, %ax
-	int $0x10;
+	int $0x10
-	pop %cx;
+	pop %cx
-	pop %di;
+	pop %di
-	cmp $VESA_OK,%al;
+	cmp $VESA_OK, %al
-	jnz 1f;
+	jnz 1f
-	jz 2b;    /* Force relative jump */
+	jz 2b						# Force relative jump
+:
-:mov $0x0003,%ax;
+	mov $0x0003, %ax
-	int $0x10;
+	int $0x10
-	mov $0xffffffff,%edi; /* EGA text mode used, because of problems with VESA */
+	mov $0xffffffff, %edi		# EGA text mode used, because of problems with VESA
-	xor %ax,%ax
+	xor %ax, %ax
-	jz 8b;    /* Force relative jump */
+	jz 8b						# Force relative jump
-vesa_init_protect:
 .code32
+vesa_init_protect:
+	popl %esp
+	movw $KDATA, %cx
+	movw %cx, %es
+	movw %cx, %fs
+	movw %cx, %gs
+	movw %cx, %ds					# kernel data + stack
+	movw %cx, %ss
-	ret;
+	jmpl $KTEXT, $vesa_meeting_point
-vesa_idt:
-.word 0x03ff
-.long 0
 .align 4
 e_vesa_init:
 #endif
 .section K_DATA_START, "aw", @progbits
 .align 4096
 page_directory:
 	.space 4096, 0

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/src/boot/boot.S – Rev 1290 → 1639