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#

# Copyright (C) 2005 Ondrej Palkovsky

# 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"

# .code16

# .global kernel_image_start

# .global multiboot_image_start

# kernel_image_start:

# 	movl $0x80000000, %eax  

# 	cpuid

# 	cmp $0x80000000, %eax 	# any function > 80000000h?

# 	jbe no_long_mode

# 	movl $(AMD_CPUID_EXTENDED), %eax # Extended function code 80000001

# 	cpuid

# 	bt $29, %edx 		# Test if long mode is supported.

# 	jnc no_long_mode

# 

# 

# no_long_mode:

# 1:

# 	jmp 1b

# 	

.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, %gs

	movw %cx, %fs

	movw %cx, %ds							# kernel data + stack

	movw %cx, %ss

	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

	# 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

			xorl %edx, %edx

			jmp mods_invalid

		mods_valid:

		movl 20(%ebx), %ecx						# mbi->mods_count

		cmpl $0, %ecx

		je mods_invalid

		movl 24(%ebx), %esi						# mbi->mods_addr

		movl 0(%esi), %edx						# mods->mod_start

		movl 4(%esi), %ecx						# mods->mod_end

		subl %edx, %ecx

		addl $0x80000000, %edx

		mods_invalid:

		movl %ecx, init_size

		movl %edx, init_addr

		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:

	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