39,270 → 39,27 |
.ascii "PT_MODE_WRITABLE" |
.byte 0 |
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.section K_TEXT_START, "ax" |
.text |
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KTEXT=8 |
KDATA=16 |
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.code32 |
.align 4 |
.global kernel_image_start |
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kernel_image_start: |
lgdt KA2PA(bootstrap_gdtr) # initialize Global Descriptor Table register |
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movw $KDATA, %cx |
movw %cx, %es |
movw %cx, %fs |
movw %cx, %gs |
movw %cx, %ds # kernel data + stack |
movw %cx, %ss |
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jmpl $KTEXT, $multiboot_meeting_point |
multiboot_meeting_point: |
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pushl %ebx # save parameters from GRUB |
pushl %eax |
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#ifdef CONFIG_FB |
mov $vesa_init, %esi |
mov $VESA_INIT_SEGMENT << 4, %edi |
mov $e_vesa_init - vesa_init, %ecx |
cld |
rep movsb |
movl $kernel_stack, %esp # initialize stack pointer |
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mov $VESA_INIT_SEGMENT << 4, %edi |
jmpl %edi |
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vesa_meeting_point: |
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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 |
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call map_kernel # map kernel and turn paging on |
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popl %eax |
popl %ebx |
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call main_bsp # never returns |
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cli |
hlt |
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.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 |
.data |
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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 |
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incl %ecx |
cmpl $512, %ecx |
jl 0b |
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movl %esi, %cr3 |
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# turn paging on |
movl %cr0, %ebx |
orl $(1<<31), %ebx |
movl %ebx, %cr0 |
ret |
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#ifdef CONFIG_FB |
vesa_init: |
jmp $selector(VESA_INIT_DES), $vesa_init_real - vesa_init |
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.code16 |
vesa_init_real: |
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mov %cr0, %eax |
and $~1, %eax |
mov %eax, %cr0 |
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jmp $VESA_INIT_SEGMENT, $vesa_init_real2 - vesa_init |
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vesa_init_real2: |
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mov $VESA_INIT_SEGMENT, %bx |
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mov %bx, %es |
mov %bx, %fs |
mov %bx, %gs |
mov %bx, %ds |
mov %bx, %ss |
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movl %esp, %eax |
movl $0x0000fffc, %esp |
movl $0x0000fffc, %ebp |
pushl %eax |
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#define VESA_INFO_SIZE 1024 |
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#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 |
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#define VESA_END_OF_MODES 0xffff |
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#define VESA_OK 0x4f |
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#define VESA_GET_INFO 0x4f00 |
#define VESA_GET_MODE_INFO 0x4f01 |
#define VESA_SET_MODE 0x4f02 |
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#define CONFIG_VESA_BPP_a 255 |
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#if CONFIG_VESA_BPP == 24 |
#undef CONFIG_VESA_BPP_a |
#define CONFIG_VESA_BPP_a 32 |
#endif |
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mov $VESA_GET_INFO, %ax |
mov $e_vesa_init - vesa_init, %di |
push %di |
int $0x10 |
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pop %di |
cmp $VESA_OK, %al |
jnz 0f |
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mov 2 + VESA_MODE_LIST_PTR_OFFSET(%di), %si |
mov %si, %gs |
mov VESA_MODE_LIST_PTR_OFFSET(%di), %si |
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add $VESA_INFO_SIZE, %di |
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1:# Try next mode |
mov %gs:(%si), %cx |
cmp $VESA_END_OF_MODES, %cx |
jz 0f |
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inc %si |
inc %si |
push %cx |
push %di |
push %si |
mov $VESA_GET_MODE_INFO, %ax |
int $0x10 |
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pop %si |
pop %di |
pop %cx |
cmp $VESA_OK, %al |
jnz 0f |
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mov $CONFIG_VESA_WIDTH, %ax |
cmp VESA_MODE_WIDTH_OFFSET(%di), %ax |
jnz 1b |
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mov $CONFIG_VESA_HEIGHT,%ax |
cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax |
jnz 1b |
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mov $CONFIG_VESA_BPP, %al |
cmp VESA_MODE_BPP_OFFSET(%di), %al |
jz 2f |
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mov $CONFIG_VESA_BPP_a, %al |
cmp VESA_MODE_BPP_OFFSET(%di), %al |
jnz 1b |
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2: |
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mov %cx, %bx |
or $0xc000, %bx |
push %di |
mov $VESA_SET_MODE, %ax |
int $0x10 |
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pop %di |
cmp $VESA_OK, %al |
jnz 0f |
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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 |
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8: |
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mov %cr0, %eax |
or $1, %eax |
mov %eax, %cr0 |
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jmp 9f |
9: |
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ljmpl $KTEXT, $(vesa_init_protect - vesa_init + VESA_INIT_SEGMENT << 4) |
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0:# No prefered mode found |
mov $0x111, %cx |
push %di |
push %cx |
mov $VESA_GET_MODE_INFO, %ax |
int $0x10 |
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pop %cx |
pop %di |
cmp $VESA_OK, %al |
jnz 1f |
jz 2b # Force relative jump |
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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 |
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.code32 |
vesa_init_protect: |
popl %esp |
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movw $KDATA, %cx |
movw %cx, %es |
movw %cx, %fs |
movw %cx, %gs |
movw %cx, %ds # kernel data + stack |
movw %cx, %ss |
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jmpl $KTEXT, $vesa_meeting_point |
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.align 4 |
e_vesa_init: |
#endif |
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.section K_DATA_START, "aw", @progbits |
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.align 4096 |
page_directory: |
.space 4096, 0 |
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kernel_stack_bottom: |
.space TEMP_STACK_SIZE |
kernel_stack: |