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#
# 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, %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_SEGMENT<<4,%edi;
mov $e_vesa_init-vesa_init,%ecx;
cld;
rep movsb;
mov $VESA_INIT_SEGMENT<<4,%edi;
call *%edi;
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 %esp,%ebp;
mov %ss,%cx;
mov $VESA_INIT_SEGMENT,%bx;
mov %bx,%ss;
mov $0x0000fffc,%esp;
push %ds;
push %es;
push %fs;
push %gs;
push %ebp;
push %cx;
mov %bx,%ds;
mov %bx,%es;
mov %bx,%fs;
mov %bx,%gs;
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
#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:
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);
0: #Error 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 */
vesa_init_protect:
.code32
ret;
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