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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"

.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