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| # |
| # Copyright (C) 2001-2004 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/pm.h> |
| |
| .section K_TEXT_START, "ax" |
| .global kernel_image_start |
| |
| KTEXT=8 |
| KDATA=16 |
| |
| .code16 |
| # |
| # This is where we require any SPARTAN-kernel-compatible boot loader |
| # to pass control in real mode. |
| # |
| # Protected mode tables are statically initialised during compile |
| # time. So we can just load the respective table registers and |
| # switch to protected mode. |
| # |
| kernel_image_start: |
| cli |
| xorw %ax, %ax |
| movw %ax, %ds |
| movw %ax, %es |
| movw %ax, %ss # initialize stack segment register |
| movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
| |
| call memmap_arch_init |
| |
| lgdt real_bootstrap_gdtr_boot # initialize Global Descriptor Table register |
| |
| movl %cr0, %eax |
| orl $0x1, %eax |
| movl %eax, %cr0 # switch to protected mode |
| |
| jmpl $KTEXT, $boot_image_start |
| |
| .code32 |
| .align 4 |
| multiboot_header: |
| .long MULTIBOOT_HEADER_MAGIC |
| .long MULTIBOOT_HEADER_FLAGS |
| .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum |
| .long multiboot_header + BOOT_OFFSET |
| .long unmapped_ktext_start + BOOT_OFFSET |
| .long 0 |
| .long 0 |
| .long multiboot_image_start + BOOT_OFFSET |
| |
| boot_image_start: |
| movw $KDATA, %ax |
| movw %ax, %es |
| movw %ax, %gs |
| movw %ax, %fs |
| movw %ax, %ds # kernel data + stack |
| movw %ax, %ss |
| |
| movb $0xd1, %al # enable A20 using i8042 controller |
| outb %al, $0x64 |
| movb $0xdf, %al |
| outb %al, $0x60 |
| |
| movl $BOOTSTRAP_OFFSET, %esi |
| movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi |
| movl $_hardcoded_kernel_size, %ecx |
| cld |
| rep movsb |
| |
| call map_kernel # map kernel and turn paging on |
| |
| call main_bsp # never returns |
| |
| cli |
| hlt |
| |
| multiboot_image_start: |
| movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
| |
| lgdt protected_bootstrap_gdtr - 0x80000000 # initialize Global Descriptor Table register |
| |
| movw $KDATA, %cx |
| movw %cx, %es |
| movw %cx, %gs |
| movw %cx, %fs |
| movw %cx, %ds # kernel data + stack |
| movw %cx, %ss |
| |
| jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET |
| multiboot_meeting_point: |
| |
| pushl %ebx # save parameters from GRUB |
| pushl %eax |
| |
| movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %esi |
| movl $BOOTSTRAP_OFFSET, %edi |
| movl $_hardcoded_unmapped_size, %ecx |
| cld |
| rep movsb |
| |
| call map_kernel # map kernel and turn paging on |
| |
| popl %eax |
| popl %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: |
| |
| mods_invalid: |
| movl %ecx, init_addr |
| movl %edx, init_size |
| |
| 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 |
| movl $e820table, %edi |
| xorl %edx, %edx |
| |
| mmap_loop: |
| cmpl $0, %ecx |
| jle mmap_end |
| |
| movl 4(%esi), %eax # mmap->base_addr_low |
| movl %eax, (%edi) |
| |
| movl 8(%esi), %eax # mmap->base_addr_high |
| movl %eax, 4(%edi) |
| |
| movl 12(%esi), %eax # mmap->length_low |
| movl %eax, 8(%edi) |
| |
| movl 16(%esi), %eax # mmap->length_high |
| movl %eax, 12(%edi) |
| |
| movl 20(%esi), %eax # mmap->type |
| movl %eax, 16(%edi) |
| |
| movl (%esi), %eax # mmap->size |
| addl $0x4, %eax |
| addl %eax, %esi |
| subl %eax, %ecx |
| addl $MEMMAP_E820_RECORD_SIZE, %edi |
| incl %edx |
| jmp mmap_loop |
| |
| mmap_end: |
| |
| mmap_invalid: |
| movl %edx, e820counter |
| |
| invalid_boot: |
| |
| call main_bsp - BOOT_OFFSET # never returns |
| |
| cli |
| hlt |
| |
| .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 |
| movl %ecx, %cr4 # turn PSE on |
| |
| movl $(page_directory+0), %esi |
| movl $(page_directory+2048), %edi |
| xorl %ecx, %ecx |
| xorl %ebx, %ebx |
| 0: |
| movl $((1<<7)|(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 0b |
| |
| movl %esi, %cr3 |
| |
| # turn paging on |
| movl %cr0, %ebx |
| orl $(1<<31), %ebx |
| movl %ebx, %cr0 |
| ret |
| |
| |
| .section K_DATA_START, "aw", @progbits |
| |
| .align 4096 |
| page_directory: |
| .space 4096, 0 |
| |
| .global real_bootstrap_gdtr_boot |
| real_bootstrap_gdtr_boot: |
| .word selector(GDT_ITEMS) |
| .long KA2PA(gdt)-BOOT_OFFSET |
| |