/* 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"