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#
# Copyright (c) 2005 Ondrej Palkovsky
# Copyright (c) 2006 Martin Decky
# Copyright (c) 2008 Jakub Jermar
# 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:
cld
movl $START_STACK, %esp # initialize stack pointer
lgdtl 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 $(INTEL_CPUID_EXTENDED), %eax
cpuid
cmp $(INTEL_CPUID_EXTENDED), %eax
ja extended_cpuid_supported
movl $extended_cpuid_msg, %esi
jmp error_halt
extended_cpuid_supported:
movl $(AMD_CPUID_EXTENDED), %eax
cpuid
bt $(AMD_EXT_LONG_MODE), %edx
jc long_mode_supported
movl $long_mode_msg, %esi
jmp error_halt
long_mode_supported:
bt $(AMD_EXT_NOEXECUTE), %edx
jc noexecute_supported
movl $noexecute_msg, %esi
jmp error_halt
noexecute_supported:
movl $(INTEL_CPUID_STANDARD), %eax
cpuid
bt $(INTEL_FXSAVE), %edx
jc fx_supported
movl $fx_msg, %esi
jmp error_halt
fx_supported:
bt $(INTEL_SSE2), %edx
jc sse2_supported
movl $sse2_msg, %esi
jmp error_halt
sse2_supported:
#include "vesa_prot.inc"
#
# Enable 64-bit page translation 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
# call arch_pre_main(grub_eax, grub_ebx)
xorq %rdi, %rdi
movl grub_eax, %edi
xorq %rsi, %rsi
movl grub_ebx, %esi
call arch_pre_main
call main_bsp
# not reached
cli
hlt0:
hlt
jmp hlt0
# 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_INI_PTLS, "aw", @progbits
#
# Macro for generating initial page table contents.
# @param cnt Number of entries to generat. Must be multiple of 8.
# @param g Number of GB that will be added to the mapping.
#
.macro ptl2gen cnt g
.if \cnt
ptl2gen "\cnt - 8" \g
.quad ((\cnt - 8) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
.quad ((\cnt - 7) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
.quad ((\cnt - 6) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
.quad ((\cnt - 5) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
.quad ((\cnt - 4) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
.quad ((\cnt - 3) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
.quad ((\cnt - 2) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
.quad ((\cnt - 1) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
.endif
.endm
# Page table for pages in the first gigabyte.
.align 4096
.global ptl_2_0g
ptl_2_0g:
ptl2gen 512 0
# Page table for pages in the second gigabyte.
.align 4096
.global ptl_2_1g
ptl_2_1g:
ptl2gen 512 1
# Page table for pages in the third gigabyte.
.align 4096
.global ptl_2_2g
ptl_2_2g:
ptl2gen 512 2
# Page table for pages in the fourth gigabyte.
.align 4096
.global ptl_2_3g
ptl_2_3g:
ptl2gen 512 3
.align 4096
.global ptl_1
ptl_1:
# Identity mapping for [0; 4G)
.quad ptl_2_0g + (PTL_WRITABLE | PTL_PRESENT)
.quad ptl_2_1g + (PTL_WRITABLE | PTL_PRESENT)
.quad ptl_2_2g + (PTL_WRITABLE | PTL_PRESENT)
.quad ptl_2_3g + (PTL_WRITABLE | PTL_PRESENT)
.fill 506, 8, 0
# Mapping of [0; 1G) at -2G
.quad ptl_2_0g + (PTL_WRITABLE | PTL_PRESENT)
.fill 1, 8, 0
.align 4096
.global ptl_0
ptl_0:
.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
.fill 255,8,0
.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
.fill 254,8,0
.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
.section K_DATA_START, "aw", @progbits
.global bootstrap_gdtr
bootstrap_gdtr:
.word gdtselector(GDT_ITEMS)
.long KA2PA(gdt)
grub_eax:
.long 0
grub_ebx:
.long 0
extended_cpuid_msg:
.asciz "Extended CPUID not supported. System halted."
long_mode_msg:
.asciz "64 bit long mode not supported. System halted."
noexecute_msg:
.asciz "No-execute pages not supported. System halted."
fx_msg:
.asciz "FXSAVE/FXRESTORE instructions not supported. System halted."
sse2_msg:
.asciz "SSE2 instructions not supported. System halted."