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gdt.s
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gdt.s
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.section .text
.global gdt_flush
.global idt_flush
.global jump_to_user
.global timer_int
.type gdt_flush, @function
.type idt_flush, @function
.type jump_to_user, @function
.type timer_int, @function
jump_to_user:
mov $0x23, %ax
movw %ax, %ds
movw %ax, %es
movw %ax, %fs
movw %ax, %gs
mov %esp, %eax
pushl $0x23
push %eax
pushf
pushl $0x1B
push $go_ahead
iret
go_ahead:
ret
gdt_flush:
movl 4(%esp), %eax
lgdt (%eax)
movw $0x10, %ax
movw %ax, %ds
movw %ax, %es
movw %ax, %fs
movw %ax, %gs
movw %ax, %ss
jmp $0x08, $gdt_flush_jmp
gdt_flush_jmp:
mov $0x2B, %ax
ltr %ax
ret
idt_flush:
mov 4(%esp), %eax
lidt (%eax)
ret
.macro ISR_NOERRCODE num
.global isr\num
.type isr\num, @function
isr\num:
cli
push $0
push $\num
jmp isr_common_stub
.endm
.macro ISR_ERRCODE num
.global isr\num
.type isr\num, @function
isr\num:
cli
push $\num
jmp isr_common_stub
.endm
.macro IRQ num
.global irq\num
.type irq\num, @function
irq\num:
cli
push $0
push $\num
jmp irq_common_stub
.endm
.global usr_int_asm
.type usr_int_asm, @function
usr_int_asm:
pusha
mov %ds, %ax
push %eax
mov $0x10, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
push %esp
call usr_int
add $4, %esp
pop %eax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
popa
iret
irq_common_stub:
pusha
mov %ds, %ax
push %eax
mov $0x10, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
push %esp
call irq_handler
add $4, %esp
pop %eax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
popa
add $8, %esp
iret
IRQ 1
IRQ 2
IRQ 3
IRQ 4
IRQ 5
IRQ 6
IRQ 7
IRQ 8
IRQ 9
IRQ 10
IRQ 11
IRQ 12
IRQ 13
IRQ 14
IRQ 15
isr_common_stub:
xchg %bx, %bx
pusha
mov %ds, %ax
push %eax
mov $0x10, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
push %esp
call isr_handler
add $4, %esp
pop %eax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
popa
add $8, %esp
iret
ISR_NOERRCODE 0
ISR_NOERRCODE 1
ISR_NOERRCODE 2
ISR_NOERRCODE 3
ISR_NOERRCODE 4
ISR_NOERRCODE 5
ISR_NOERRCODE 6
ISR_NOERRCODE 7
ISR_ERRCODE 8
ISR_NOERRCODE 9
ISR_ERRCODE 10
ISR_ERRCODE 11
ISR_ERRCODE 12
ISR_ERRCODE 13
ISR_ERRCODE 14
ISR_NOERRCODE 15
ISR_NOERRCODE 16
ISR_NOERRCODE 17
ISR_NOERRCODE 18
ISR_NOERRCODE 19
ISR_NOERRCODE 20
ISR_NOERRCODE 21
ISR_NOERRCODE 22
ISR_NOERRCODE 23
ISR_NOERRCODE 24
ISR_NOERRCODE 25
ISR_NOERRCODE 26
ISR_NOERRCODE 27
ISR_NOERRCODE 28
ISR_NOERRCODE 29
ISR_NOERRCODE 30
ISR_NOERRCODE 31
.global irq0
.type irq0, @function
irq0: //Timer Interrupt! Scheduling please!
cli
pusha
mov %ds, %ax
push %eax
mov $0x10, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
push %esp
call timer_int
mov %eax, %esp
pop %eax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
popa
iret
.global yield
.type yield, @function
yield: //Yielded
cli
pusha
mov %ds, %ax
push %eax
mov $0x10, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
push %esp
call process_yield
mov %eax, %esp
pop %eax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
popa
iret