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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, %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
    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 $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