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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:

	cld

	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:

	movl %eax, grub_eax					# save parameters from GRUB

	movl %ebx, grub_ebx

	xorl %eax, %eax  

 	cpuid

 	cmp $0x0, %eax						# any function > 0?

	jbe pse_unsupported

	movl $0x1, %eax						# Basic function code 1

	cpuid

	bt $3, %edx							# Test if PSE is supported

	jc pse_supported

	pse_unsupported:

		movl $pse_msg, %esi

		jmp error_halt

	pse_supported:

#ifdef CONFIG_FB

	mov $vesa_init, %esi

	mov $VESA_INIT_SEGMENT << 4, %edi

	mov $e_vesa_init - vesa_init, %ecx

	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

	movl grub_eax, %eax

	movl grub_ebx, %ebx

	cmpl $MULTIBOOT_LOADER_MAGIC, %eax				# compare GRUB signature

	je valid_boot

		xorl %ecx, %ecx							# no memory map available

		movl %ecx, e820counter

		jmp invalid_boot

	valid_boot:

	movl grub_eax, %eax

	movl grub_ebx, %ebx

	# ia32_boot(grub_eax, grub_ebx)

	pushl %ebx

	pushl %eax

	call ia32_cboot		# Does not return.

	# Not reached.

	invalid_boot:

	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							# turn PSE on

	andl $(~(1 << 5)), %ecx						# turn PAE off

	movl %ecx, %cr4

	movl $(page_directory + 0), %esi

	movl $(page_directory + 2048), %edi

	xorl %ecx, %ecx

	xorl %ebx, %ebx

0:

	movl $((1 << 7) | (1 << 1) | (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

	movl %cr0, %ebx

	orl $(1 << 31), %ebx						# turn paging on

	movl %ebx, %cr0

	ret

# Print string from %esi to EGA display (in red) and halt

error_halt:

	movl $0xb8000, %edi						# base of EGA text mode memory

	xorl %eax, %eax

	movw $0x3d4, %dx						# read bits 8 - 15 of the cursor address

	movb $0xe, %al

	outb %al, %dx

	movw $0x3d5, %dx

	inb %dx, %al

	shl $8, %ax

	movw $0x3d4, %dx						# read bits 0 - 7 of the cursor address

	movb $0xf, %al

	outb %al, %dx

	movw $0x3d5, %dx

	inb %dx, %al

	cmp $1920, %ax

	jbe cursor_ok

		movw $1920, %ax						# sanity check for the cursor on the last line

	cursor_ok:

	movw %ax, %bx

	shl $1, %eax

	addl %eax, %edi

	movw $0x0c00, %ax						# black background, light red foreground

	ploop:

		lodsb

		cmp $0, %al

		je ploop_end

		stosw

		inc %bx	

		jmp ploop

	ploop_end:

	movw $0x3d4, %dx						# write bits 8 - 15 of the cursor address

	movb $0xe, %al

	outb %al, %dx

	movw $0x3d5, %dx

	movb %bh, %al

	outb %al, %dx

	movw $0x3d4, %dx						# write bits 0 - 7 of the cursor address

	movb $0xf, %al

	outb %al, %dx

	movw $0x3d5, %dx

	movb %bl, %al

	outb %al, %dx

	cli

	hlt

#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_ATTRIBUTES_OFFSET 0

#define VESA_MODE_LIST_PTR_OFFSET 14

#define VESA_MODE_SCANLINE_OFFSET 16

#define VESA_MODE_WIDTH_OFFSET 18

#define VESA_MODE_HEIGHT_OFFSET 20

#define VESA_MODE_BPP_OFFSET 25

#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 VESA_SET_PALETTE 0x4f09

#if CONFIG_VESA_BPP == 24

#define CONFIG_VESA_BPP_VARIANT 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

#ifdef CONFIG_VESA_BPP_VARIANT

	jz 2f

	mov $CONFIG_VESA_BPP_VARIANT, %al

	cmp VESA_MODE_BPP_OFFSET(%di), %al

#endif

	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

#if CONFIG_VESA_BPP == 8

	# Set 3:2:3 VGA palette

	mov VESA_MODE_ATTRIBUTES_OFFSET(%di), %ax

	push %di

	mov $vga323 - vesa_init, %di

	mov $0x100, %ecx

	bt $5, %ax							# Test if VGA compatible registers are present

	jnc vga_compat

		# Try VESA routine to set palette

		mov $VESA_SET_PALETTE, %ax

		xor %bl, %bl

		xor %dx, %dx

		int $0x10

		cmp $0x00, %ah

		je vga_not_compat

	vga_compat:

		# Try VGA registers to set palette

		movw $0x3c6, %dx						# Set palette mask

		movb $0xff, %al

		outb %al, %dx

		movw $0x3c8, %dx						# First index to set

		xor %al, %al

		outb %al, %dx

		movw $0x3c9, %dx						# Data port

		vga_loop:

			movb %es:2(%di), %al

			outb %al, %dx

			movb %es:1(%di), %al

			outb %al, %dx

			movb %es:(%di), %al

			outb %al, %dx

			addw $4, %di

			loop vga_loop

	vga_not_compat:

	pop %di

#endif

	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

vga323:

#include "vga323.pal"

.code32

vesa_init_protect:

	movw $selector(KDATA_DES), %cx

	movw %cx, %es

	movw %cx, %fs

	movw %cx, %gs

	movw %cx, %ds					# kernel data + stack

	movw %cx, %ss

	movl $START_STACK, %esp			# initialize stack pointer

	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

grub_eax:

	.long 0

grub_ebx:

	.long 0

pse_msg:

	.asciz "Page Size Extension not supported. System halted."