70 lines
1.2 KiB
ArmAsm
70 lines
1.2 KiB
ArmAsm
#define PIC1_ADDR 0x20 + 0xC0000000
|
|
#define PIC2_ADDR 0xA0 + 0xC0000000
|
|
#define PIC1_COMMAND PIC1_ADDR
|
|
#define PIC1_DATA (PIC1_ADDR+1)
|
|
#define PIC2_COMMAND PIC2_ADDR
|
|
#define PIC2_DATA (PIC2_ADDR+1)
|
|
#define PIC_EOI 0x20
|
|
|
|
.code32
|
|
|
|
.global init_pic
|
|
init_pic:
|
|
# init command
|
|
mov $0x11, %al
|
|
outb %al, $PIC1_COMMAND
|
|
outb %al, $PIC2_COMMAND
|
|
|
|
# vector offsets
|
|
mov $0x20, %al
|
|
outb %al, $PIC1_DATA
|
|
mov $0x28, %al
|
|
outb %al, $PIC2_DATA
|
|
|
|
# cascade
|
|
mov $0x04, %al
|
|
outb %al, $PIC1_DATA
|
|
mov $0x02, %al
|
|
outb %al, $PIC2_DATA
|
|
|
|
# env
|
|
mov $0x01, %al
|
|
outb %al, $PIC1_DATA
|
|
outb %al, $PIC2_DATA
|
|
|
|
# mask
|
|
mov $0xFE, %al
|
|
outb %al, $PIC1_DATA
|
|
mov $0xFF, %al
|
|
outb %al, $PIC2_DATA
|
|
|
|
ret
|
|
|
|
.global send_eoi_master
|
|
send_eoi_master:
|
|
mov $0x20, %al
|
|
outb %al, $PIC1_COMMAND
|
|
ret
|
|
|
|
.global send_eoi_slave
|
|
send_eoi_slave:
|
|
mov $0x20, %al
|
|
outb %al, $PIC2_COMMAND
|
|
call send_eoi_master
|
|
ret
|
|
|
|
.global read_isr_master
|
|
read_isr_master:
|
|
xorl %eax, %eax
|
|
mov $0x0B, %al
|
|
outb %al, $PIC1_COMMAND
|
|
in $PIC1_COMMAND, %al
|
|
ret
|
|
|
|
.global read_isr_slave
|
|
read_isr_slave:
|
|
xorl %eax, %eax
|
|
mov $0x0B, %al
|
|
outb %al, $PIC2_COMMAND
|
|
in $PIC2_COMMAND, %al
|
|
ret |