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/* boot.S - main bootup file */
#include <asm/boot.h>
#include <asm/version.h>
GDT_SIZE = (gdt_end - gdt)
IDT_SIZE = (idt_end - idt)
KERNEL_TRACKS = ((KERNEL_BLOCKS+DISK_SECTORS_PER_TRACK-1)/DISK_SECTORS_PER_TRACK)
.text
.code16
.global start
start:
xor %ax,%ax
int $0x13
# Load kernel
mov $0x0001,%cx
xor %dh,%dh
xor %bx,%bx
mov $0x50,%ax
mov %ax,%es
load_kernel_loop:
mov $0x02,%ah
mov $DISK_SECTORS_PER_TRACK,%al
push %dx
int $0x13
pop %dx
jc error
mov %es,%ax
add $(0x20*DISK_SECTORS_PER_TRACK),%ax
mov %ax,%es
add %dh,%ch
or %dh,%dh
jnz head0
inc %dh
jmp head1
head0:
xor %dh,%dh
head1:
cmp $(KERNEL_TRACKS/2),%ch
jb load_kernel_loop
ljmp $0x50, $load
load:
cli
mov %cs,%ax
mov %ax,%ds
mov $0x01,%ah
mov $0b0010000000000000,%cx
int $0x10
mov $0x36,%al
out %al,$0x43
mov $0x9B,%al
out %al,$0x40
mov $0x2E,%al
out %al,$0x40
key_ready:
in $0x64,%al
and $0b00000010,%al
jnz key_ready
mov $0xED,%al
out %al,$0x60
key_ready2:
in $0x64,%al
and $0b00000010,%al
jnz key_ready2
xor %al,%al
out %al,$0x60
mov $0b00010001,%al
out %al,$0x20
out %al,$0xA0
mov $0x20,%al
out %al,$0x21
mov $0x28,%al
out %al,$0xA1
mov $0b00000100,%al
out %al,$0x21
mov $0b00000010,%al
out %al,$0xA1
mov $0b00000001,%al
out %al,$0x21
out %al,$0xA1
lgdt gdt_struct
lidt idt_struct
mov %cr0,%eax
or $1,%eax
mov %eax,%cr0
.byte 0xea
.word pmode
.word 8
pmode:
.code32
mov $16,%ax
mov %ax,%ds
mov $24,%ax
mov %ax,%ss
mov $0x1FFF,%esp
sti
cld
pushl $'\f'
call print_char
addl $4,%esp
pushl $0b00001111
pushl $verstring
call print_attr
addl $8,%esp
#call init_floppy
#call test
done:
xor %edx,%edx
call kb_read_keycode
or %eax,%eax
jz done
or %edx,%edx
jz done
and $0b10000000,%al
jnz done
pushl %edx
call print_char
addl $4,%esp
call floppy_proc
jmp done
error: jmp error
.org 0x1FE
.word 0xAA55
.org 0x200
.data
gdt:
.word 0, 0, 0, 0 # dummy
.word 0xFFFF, KERNEL_START, 0x9A00, 0x00CF # kernel code, 4 GB, code exec/read, 386 Segment
.word 0xFFFF, KERNEL_START, 0x9200, 0x00CF # kernel data, 4 GB, data read/write, 386 Segment
.word 0x2000, 0x8000, 0x9200, 0 # kernel stack, 8192 Bytes, data read/write, base address 0x8000
.word 4000, 0x8000, 0x920B, 0 # VRAM, 4000 Bytes, data read/write, base address 0xB8000
.word 0x0500, 0, 0x9200, 0 # BIOS data, 0x500 Bytes, data read/write, base address 0
gdt_end:
idt:
.word EXC_DIV_ERROR, CODE_SEL, 0x8E00, 0
.word EXC_DEBUG, CODE_SEL, 0x8E00, 0
.word EXC_NMI, CODE_SEL, 0x8E00, 0
.word EXC_BREAKPOINT, CODE_SEL, 0x8E00, 0
.word EXC_INTO_OVERFLOW, CODE_SEL, 0x8E00, 0
.word EXC_BOUND_OVERFLOW, CODE_SEL, 0x8E00, 0
.word EXC_INVAL_OPCODE, CODE_SEL, 0x8E00, 0
.word EXC_NO_COPROCESSOR, CODE_SEL, 0x8E00, 0
.word EXC_DOUBLE_EXCEPTION, CODE_SEL, 0x8E00, 0
.word EXC_COPROC_PROT_ERROR, CODE_SEL, 0x8E00, 0
.word EXC_INVAL_TSS, CODE_SEL, 0x8E00, 0
.word EXC_SEG_NOT_PRESENT, CODE_SEL, 0x8E00, 0
.word EXC_STACK_FAULT, CODE_SEL, 0x8E00, 0
.word EXC_GEN_PROT_VIOLATION, CODE_SEL, 0x8E00, 0
.word EXC_PAGE_FAULT, CODE_SEL, 0x8E00, 0
.word EXC_RESERVED, CODE_SEL, 0x8E00, 0
.word EXC_COPROCESSOR_ERROR, CODE_SEL, 0x8E00, 0
.word EXC_ALIGN_ERROR, CODE_SEL, 0x8E00, 0
.word EXC_RESERVED, CODE_SEL, 0x8E00, 0
.word EXC_RESERVED, CODE_SEL, 0x8E00, 0
.word EXC_RESERVED, CODE_SEL, 0x8E00, 0
.word EXC_RESERVED, CODE_SEL, 0x8E00, 0
.word EXC_RESERVED, CODE_SEL, 0x8E00, 0
.word EXC_RESERVED, CODE_SEL, 0x8E00, 0
.word EXC_RESERVED, CODE_SEL, 0x8E00, 0
.word EXC_RESERVED, CODE_SEL, 0x8E00, 0
.word EXC_RESERVED, CODE_SEL, 0x8E00, 0
.word EXC_RESERVED, CODE_SEL, 0x8E00, 0
.word EXC_RESERVED, CODE_SEL, 0x8E00, 0
.word EXC_RESERVED, CODE_SEL, 0x8E00, 0
.word EXC_RESERVED, CODE_SEL, 0x8E00, 0
.word EXC_RESERVED, CODE_SEL, 0x8E00, 0
.word IRQ0, CODE_SEL, 0x8E00, 0
.word IRQ1, CODE_SEL, 0x8E00, 0
.word IRQ2, CODE_SEL, 0x8E00, 0
.word IRQ3, CODE_SEL, 0x8E00, 0
.word IRQ4, CODE_SEL, 0x8E00, 0
.word IRQ5, CODE_SEL, 0x8E00, 0
.word IRQ6, CODE_SEL, 0x8E00, 0
.word IRQ7, CODE_SEL, 0x8E00, 0
.word IRQ8, CODE_SEL, 0x8E00, 0
.word IRQ9, CODE_SEL, 0x8E00, 0
.word IRQ10, CODE_SEL, 0x8E00, 0
.word IRQ11, CODE_SEL, 0x8E00, 0
.word IRQ12, CODE_SEL, 0x8E00, 0
.word IRQ13, CODE_SEL, 0x8E00, 0
.word IRQ14, CODE_SEL, 0x8E00, 0
.word IRQ15, CODE_SEL, 0x8E00, 0
idt_end:
gdt_struct:
.word GDT_SIZE # gdt size
.long (KERNEL_START+gdt) # gdt base address
idt_struct:
.word IDT_SIZE
.long (KERNEL_START+idt)
verstring: .ascii "WINX " WINX_VERSION "\r\n\0"
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