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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