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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 $gdtselector(KDATA_DES), %cx
    movw %cx, %es
    movw %cx, %fs
    movw %cx, %gs
    movw %cx, %ds               # kernel data + stack
    movw %cx, %ss
    
    jmpl $gdtselector(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:

#include "vesa_prot.inc"

    # map kernel and turn paging on
    call map_kernel
    
    # call arch_pre_main(grub_eax, grub_ebx)
    pushl grub_ebx
    pushl grub_eax
    call arch_pre_main
    
    call main_bsp
    
    # not reached
    cli
    hlt0:
        hlt
        jmp hlt0

.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
    
    floop:
        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 floop
    
    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
    hlt1:
        hlt
        jmp hlt1

#include "vesa_real.inc"

.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."