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#
# Copyright (C) 2005 Ondrej Palkovsky
# Copyright (C) 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/mm/ptl.h>
#include <arch/pm.h>
#include <arch/cpu.h>
#include <arch/cpuid.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 bootstrap_gdtr             # initialize Global Descriptor Table register

    movw $gdtselector(KDATA_DES), %cx
    movw %cx, %es
    movw %cx, %ds                           # kernel data + stack
    movw %cx, %ss
    # Simics seems to remove hidden part of GS on entering user mode
    #  when _visible_ part of GS does not point to user-mode segment
    movw $gdtselector(UDATA_DES), %cx
    movw %cx, %fs
    movw %cx, %gs
    
    jmpl $gdtselector(KTEXT32_DES), $multiboot_meeting_point
    multiboot_meeting_point:
    
    movl %eax, grub_eax                         # save parameters from GRUB
    movl %ebx, grub_ebx
    
    # Protected 32-bit. We want to reuse the code-seg descriptor,
    # the Default operand size must not be 1 when entering long mode
    
    movl $0x80000000, %eax  
    cpuid
    cmp $0x80000000, %eax                       # any function > 80000000h?
    jbe long_mode_unsupported
    movl $(AMD_CPUID_EXTENDED), %eax            # Extended function code 80000001
    cpuid
    bt $29, %edx                                # Test if long mode is supported.
    jc long_mode_supported

    long_mode_unsupported:
        cli
        hlt
    
    long_mode_supported:
    
    # Enable 64-bit page transaltion entries - CR4.PAE = 1.
    # Paging is not enabled until after long mode is enabled
    
    movl %cr4, %eax
    btsl $5, %eax
    movl %eax, %cr4

    # Set up paging tables
    
    leal ptl_0, %eax
    movl %eax, %cr3
    
    # Enable long mode
    
    movl $EFER_MSR_NUM, %ecx    # EFER MSR number
    rdmsr                       # Read EFER
    btsl $AMD_LME_FLAG, %eax    # Set LME=1
    wrmsr                       # Write EFER
    
    # Enable paging to activate long mode (set CR0.PG=1)
    
    movl %cr0, %eax
    btsl $31, %eax
    movl %eax, %cr0
    
    # At this point we are in compatibility mode
    
    jmpl $gdtselector(KTEXT_DES), $start64

.code64
start64:
    movq $(PA2KA(START_STACK)), %rsp
    movl grub_eax, %eax
    movl grub_ebx, %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:
        
        xorq %rcx, %rcx
        movl 20(%ebx), %ecx                     # mbi->mods_count
        movl %ecx, init
        
        cmpl $0, %ecx
        je mods_end
        
        movl 24(%ebx), %esi                     # mbi->mods_addr
        movq $init, %rdi
        
        mods_loop:
            
            xorq %rdx, %rdx
            movl 0(%esi), %edx                  # mods->mod_start
            addq $0xffffffff80000000, %rdx
            movq %rdx, 4(%rdi)
            
            xorq %rdx, %rdx
            movl 4(%esi), %edx
            subl 0(%esi), %edx                  # mods->mod_end - mods->mod_start
            movq %rdx, 12(%rdi)
            
            addl $16, %esi
            addq $16, %rdi
            
            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
        movq $e820table, %rdi
        xorl %edx, %edx
        
        mmap_loop:
            cmpl $0, %ecx
            jle mmap_end
            
            movl 4(%esi), %eax                  # mmap->base_addr_low
            movl %eax, (%rdi)
            
            movl 8(%esi), %eax                  # mmap->base_addr_high
            movl %eax, 4(%rdi)
            
            movl 12(%esi), %eax                 # mmap->length_low
            movl %eax, 8(%rdi)
            
            movl 16(%esi), %eax                 # mmap->length_high
            movl %eax, 12(%rdi)
            
            movl 20(%esi), %eax                 # mmap->type
            movl %eax, 16(%rdi)
            
            movl (%esi), %eax                   # mmap->size
            addl $0x4, %eax
            addl %eax, %esi
            subl %eax, %ecx
            addq $MEMMAP_E820_RECORD_SIZE, %rdi
            incl %edx
            jmp mmap_loop
        
        mmap_end:
        
        mmap_invalid:
        movl %edx, e820counter
        
    invalid_boot:
    
#ifdef CONFIG_SMP
    
    # copy AP bootstrap routines below 1 MB
    
    movq $BOOT_OFFSET, %rsi
    movq $AP_BOOT_OFFSET, %rdi
    movq $_hardcoded_unmapped_size, %rcx
    cld
    rep movsb
    
#endif
    
    call main_bsp   # never returns
    
    cli
    hlt
                
.section K_DATA_START, "aw", @progbits
.align 4096

# Identical mapping of first 64MB and the same of -2GB -> 0 
.global ptl_2
ptl_2:  
    .quad 0x0 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0xa00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0xc00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0xe00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x1000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x1200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x1400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x1600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x1800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x1a00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x1c00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x1e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x2000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x2200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x2400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x2600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x2800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x2a00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x2c00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x2e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x3000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x3200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x3400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x3600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x3800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x3a00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x3c00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    .quad 0x3e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
    
.align 4096
.global ptl_1
ptl_1:
    .quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT)
    .fill 509,8,0
    .quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT)
    .fill 1,8,0
    
.align 4096
.global ptl_0
ptl_0:
    .quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
    .fill 510,8,0
    .quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)

.global bootstrap_gdtr
bootstrap_gdtr:
    .word gdtselector(GDT_ITEMS)
    .long KA2PA(gdt)

grub_eax:
    .long 0

grub_ebx:
    .long 0