| 39,270 → 39,27 |
|---|
| .ascii "PT_MODE_WRITABLE" |
| .byte 0 |
| |
| .section K_TEXT_START, "ax" |
| .text |
| |
| KTEXT=8 |
| KDATA=16 |
| |
| .code32 |
| .align 4 |
| .global kernel_image_start |
| |
| kernel_image_start: |
| lgdt KA2PA(bootstrap_gdtr) # initialize Global Descriptor Table register |
| |
| movw $KDATA, %cx |
| movw %cx, %es |
| movw %cx, %fs |
| movw %cx, %gs |
| 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 |
| jmpl %edi |
| movl $kernel_stack, %esp # initialize stack pointer |
| |
| vesa_meeting_point: |
| |
| 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 |
| |
| 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 |
| .data |
| |
| 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 $VESA_INIT_SEGMENT, %bx |
| |
| mov %bx, %es |
| mov %bx, %fs |
| mov %bx, %gs |
| mov %bx, %ds |
| mov %bx, %ss |
| |
| movl %esp, %eax |
| movl $0x0000fffc, %esp |
| movl $0x0000fffc, %ebp |
| pushl %eax |
| |
| #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: |
| |
| ljmpl $KTEXT, $(vesa_init_protect - vesa_init + VESA_INIT_SEGMENT << 4) |
| |
| 0:# 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 |
| |
| |
| .code32 |
| vesa_init_protect: |
| popl %esp |
| |
| movw $KDATA, %cx |
| movw %cx, %es |
| movw %cx, %fs |
| movw %cx, %gs |
| movw %cx, %ds # kernel data + stack |
| movw %cx, %ss |
| |
| jmpl $KTEXT, $vesa_meeting_point |
| |
| .align 4 |
| e_vesa_init: |
| #endif |
| |
| .section K_DATA_START, "aw", @progbits |
| |
| .align 4096 |
| page_directory: |
| .space 4096, 0 |
| |
| kernel_stack_bottom: |
| .space TEMP_STACK_SIZE |
| kernel_stack: |