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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/mm/page.h>
#include <arch/pm.h>
.section __xen_guest
.ascii "GUEST_OS=HelenOS,"
.ascii "XEN_VER=xen-3.0,"
.ascii "HYPERCALL_PAGE=0x2,"
.ascii "LOADER=generic,"
.ascii "PT_MODE_WRITABLE"
.byte 0
.section K_TEXT_START, "ax"
KTEXT=8
KDATA=16
.code32
.align 4
.global kernel_image_start
kernel_image_start:
lgdt KA2PA(bootstrap_gdtr) # initialize Global Descriptor Table register
movw $KDATA, %cx
movw %cx, %es
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_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
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 $KTEXT, $(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 $KDATA, %cx
movw %cx, %es
movw %cx, %fs
movw %cx, %gs
movw %cx, %ds # kernel data + stack
movw %cx, %ss
jmpl $KTEXT, $vesa_meeting_point
.align 4
e_vesa_init:
#endif
.section K_DATA_START, "aw", @progbits
.align 4096
page_directory:
.space 4096, 0