# # Copyright (C) 2001-2004 Jakub Jermar # Copyright (C) 2005-2006 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 #include #include #include #define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE) .section K_TEXT_START, "ax" KTEXT=8 KDATA=16 .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 KA2PA(bootstrap_gdtr) # 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 multiboot_meeting_point: pushl %ebx # save parameters from GRUB pushl %eax #ifdef CONFIG_FB mov $vesa_init,%esi; mov $VESA_INIT_SEGMENT<<4,%edi; mov $e_vesa_init-vesa_init,%ecx; cld; rep movsb; mov $VESA_INIT_SEGMENT<<4,%edi; call *%edi; mov %esi,KA2PA(vesa_ph_addr); mov %di,KA2PA(vesa_height); shr $16,%edi; mov %di,KA2PA(vesa_width); mov %bx,KA2PA(vesa_scanline); shr $16,%ebx; mov %bx,KA2PA(vesa_bpp); #endif 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 movl %ecx, init jmp mods_end mods_valid: movl 20(%ebx), %ecx # mbi->mods_count movl %ecx, init cmpl $0, %ecx je mods_end movl 24(%ebx), %esi # mbi->mods_addr movl $init, %edi mods_loop: movl 0(%esi), %edx # mods->mod_start addl $0x80000000, %edx movl %edx, 4(%edi) movl 4(%esi), %edx subl 0(%esi), %edx # mods->mod_end - mods->mod_start movl %edx, 8(%edi) addl $16, %esi addl $8 , %edi 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 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: #ifdef CONFIG_SMP # copy AP bootstrap routines below 1 MB movl $BOOT_OFFSET, %esi movl $AP_BOOT_OFFSET, %edi movl $_hardcoded_unmapped_size, %ecx cld rep movsb #endif call main_bsp # 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 #ifdef CONFIG_FB vesa_init: jmp $selector(VESA_INIT_DES),$vesa_init_real-vesa_init; .code16 vesa_init_real: mov %cr0,%eax; and $~1,%eax; mov %eax,%cr0; jmp $VESA_INIT_SEGMENT,$vesa_init_real2-vesa_init; vesa_init_real2: mov %esp,%ebp; mov %ss,%cx; mov $VESA_INIT_SEGMENT,%bx; mov %bx,%ss; mov $0x0000fffc,%esp; push %ds; push %es; push %fs; push %gs; push %ebp; push %cx; mov %bx,%ds; mov %bx,%es; mov %bx,%fs; mov %bx,%gs; mov $vesa_idt-vesa_init,%ebx; lidtl (%ebx); #define VESA_INFO_SIZE 1024 #define VESA_MODE_LIST_PTR_OFFSET 14 #define VESA_MODE_WIDTH_OFFSET 18 #define VESA_MODE_HEIGHT_OFFSET 20 #define VESA_MODE_BPP_OFFSET 25 #define VESA_MODE_SCANLINE_OFFSET 16 #define VESA_MODE_PHADDR_OFFSET 40 #define VESA_END_OF_MODES 0xffff #define VESA_OK 0x4f #define VESA_GET_INFO 0x4f00 #define VESA_GET_MODE_INFO 0x4f01 #define VESA_SET_MODE 0x4f02 #define CONFIG_VESA_BPP_a 255 #if CONFIG_VESA_BPP==24 #undef CONFIG_VESA_BPP_a #define CONFIG_VESA_BPP_a 32 #endif mov $VESA_GET_INFO,%ax; mov $e_vesa_init-vesa_init,%di push %di; int $0x10; pop %di; cmp $VESA_OK,%al; jnz 0f; mov 2+VESA_MODE_LIST_PTR_OFFSET(%di),%si; mov %si,%gs; mov VESA_MODE_LIST_PTR_OFFSET(%di),%si; add $VESA_INFO_SIZE,%di; 1:# Try next mode mov %gs:(%si),%cx; cmp $VESA_END_OF_MODES,%cx; jz 0f; inc %si; inc %si; push %cx; push %di; push %si; mov $VESA_GET_MODE_INFO,%ax; int $0x10; pop %si; pop %di; pop %cx; cmp $VESA_OK,%al; jnz 0f; mov $CONFIG_VESA_WIDTH,%ax; cmp VESA_MODE_WIDTH_OFFSET(%di),%ax; jnz 1b; mov $CONFIG_VESA_HEIGHT,%ax; cmp VESA_MODE_HEIGHT_OFFSET(%di),%ax; jnz 1b; mov $CONFIG_VESA_BPP,%al; cmp VESA_MODE_BPP_OFFSET(%di),%al; jz 2f; mov $CONFIG_VESA_BPP_a,%al; cmp VESA_MODE_BPP_OFFSET(%di),%al; jnz 1b; 2: mov %cx,%bx; or $0xC000,%bx; push %di; mov $VESA_SET_MODE,%ax; int $0x10; pop %di; cmp $VESA_OK,%al; jnz 0f; mov VESA_MODE_PHADDR_OFFSET(%di),%esi; mov VESA_MODE_WIDTH_OFFSET(%di),%ax; shl $16,%eax; mov VESA_MODE_HEIGHT_OFFSET(%di),%ax; mov VESA_MODE_BPP_OFFSET(%di),%bl; xor %bh,%bh; shl $16,%ebx; mov VESA_MODE_SCANLINE_OFFSET(%di),%bx; mov %eax,%edi; 8: mov %cr0,%eax; or $1,%eax; mov %eax,%cr0; jmp 9f; 9: pop %cx; pop %ebp; pop %gs; pop %fs; pop %es; pop %ds; mov %cx,%ss; mov %ebp,%esp; ljmpl $KTEXT,$(vesa_init_protect-vesa_init+VESA_INIT_SEGMENT<<4); 0: #Error no Prefered mode found mov $0x111,%cx; push %di; push %cx; mov $VESA_GET_MODE_INFO,%ax; int $0x10; pop %cx; pop %di; cmp $VESA_OK,%al; jnz 1f; jz 2b; /* Force relative jump */ 1:mov $0x0003,%ax; int $0x10; mov $0xffffffff,%edi; /* EGA text mode used, because of problems with VESA */ xor %ax,%ax jz 8b; /* Force relative jump */ vesa_init_protect: .code32 ret; vesa_idt: .word 0x03ff .long 0 .align 4 e_vesa_init: #endif .section K_DATA_START, "aw", @progbits .align 4096 page_directory: .space 4096, 0