minix/kernel/arch/i386/i8259.c
Arun Thomas 2a8fabf4ad Include directory reorg and makefile updates.
-Convert the include directory over to using bsdmake
 syntax
-Update/add mkfiles
-Modify install(1) so that it can create symlinks
-Update makefiles to use new install(1) options
-Rename /usr/include/ibm to /usr/include/i386
-Create /usr/include/machine symlink to arch header files
-Move vm_i386.h to its new home in the /usr/include/i386
-Update source files to #include the header files at their
 new homes.
-Add new gnu-includes target for building GCC headers
2010-03-08 11:04:59 +00:00

105 lines
3.9 KiB
C

/* This file contains routines for initializing the 8259 interrupt controller:
* put_irq_handler: register an interrupt handler
* rm_irq_handler: deregister an interrupt handler
* intr_handle: handle a hardware interrupt
* intr_init: initialize the interrupt controller(s)
*/
#include "../../kernel.h"
#include "../../proc.h"
#include "proto.h"
#include <minix/portio.h>
#include <machine/cpu.h>
#define ICW1_AT 0x11 /* edge triggered, cascade, need ICW4 */
#define ICW1_PC 0x13 /* edge triggered, no cascade, need ICW4 */
#define ICW1_PS 0x19 /* level triggered, cascade, need ICW4 */
#define ICW4_AT_SLAVE 0x01 /* not SFNM, not buffered, normal EOI, 8086 */
#define ICW4_AT_MASTER 0x05 /* not SFNM, not buffered, normal EOI, 8086 */
#define ICW4_PC_SLAVE 0x09 /* not SFNM, buffered, normal EOI, 8086 */
#define ICW4_PC_MASTER 0x0D /* not SFNM, buffered, normal EOI, 8086 */
#define ICW4_AT_AEOI_SLAVE 0x03 /* not SFNM, not buffered, auto EOI, 8086 */
#define ICW4_AT_AEOI_MASTER 0x07 /* not SFNM, not buffered, auto EOI, 8086 */
#define ICW4_PC_AEOI_SLAVE 0x0B /* not SFNM, buffered, auto EOI, 8086 */
#define ICW4_PC_AEOI_MASTER 0x0F /* not SFNM, buffered, auto EOI, 8086 */
/*===========================================================================*
* intr_init *
*===========================================================================*/
PUBLIC int intr_init(int mine, int auto_eoi)
{
/* Initialize the 8259s, finishing with all interrupts disabled. This is
* only done in protected mode, in real mode we don't touch the 8259s, but
* use the BIOS locations instead. The flag "mine" is set if the 8259s are
* to be programmed for MINIX, or to be reset to what the BIOS expects.
*/
if (!intr_disabled())
intr_disable();
/* The AT and newer PS/2 have two interrupt controllers, one master,
* one slaved at IRQ 2. (We don't have to deal with the PC that
* has just one controller, because it must run in real mode.)
*/
outb( INT_CTL, machine.ps_mca ? ICW1_PS : ICW1_AT);
outb( INT_CTLMASK, mine == INTS_MINIX ? IRQ0_VECTOR : BIOS_IRQ0_VEC);
/* ICW2 for master */
outb( INT_CTLMASK, (1 << CASCADE_IRQ));
/* ICW3 tells slaves */
if (auto_eoi)
outb( INT_CTLMASK, ICW4_AT_AEOI_MASTER);
else
outb( INT_CTLMASK, ICW4_AT_MASTER);
outb( INT_CTLMASK, ~(1 << CASCADE_IRQ)); /* IRQ 0-7 mask */
outb( INT2_CTL, machine.ps_mca ? ICW1_PS : ICW1_AT);
outb( INT2_CTLMASK, mine == INTS_MINIX ? IRQ8_VECTOR : BIOS_IRQ8_VEC);
/* ICW2 for slave */
outb( INT2_CTLMASK, CASCADE_IRQ); /* ICW3 is slave nr */
if (auto_eoi)
outb( INT2_CTLMASK, ICW4_AT_AEOI_SLAVE);
else
outb( INT2_CTLMASK, ICW4_AT_SLAVE);
outb( INT2_CTLMASK, ~0); /* IRQ 8-15 mask */
/* Copy the BIOS vectors from the BIOS to the Minix location, so we
* can still make BIOS calls without reprogramming the i8259s.
*/
#if IRQ0_VECTOR != BIOS_IRQ0_VEC
phys_copy(BIOS_VECTOR(0) * 4L, VECTOR(0) * 4L, 8 * 4L);
#endif
#if IRQ8_VECTOR != BIOS_IRQ8_VEC
phys_copy(BIOS_VECTOR(8) * 4L, VECTOR(8) * 4L, 8 * 4L);
#endif
return OK;
}
/*===========================================================================*
* intr_disabled *
*===========================================================================*/
PUBLIC int intr_disabled(void)
{
if(!(read_cpu_flags() & X86_FLAG_I))
return 1;
return 0;
}
PUBLIC void irq_8259_unmask(int irq)
{
unsigned ctl_mask = irq < 8 ? INT_CTLMASK : INT2_CTLMASK;
outb(ctl_mask, inb(ctl_mask) & ~(1 << (irq & 0x7)));
}
PUBLIC void irq_8259_mask(int irq)
{
unsigned ctl_mask = irq < 8 ? INT_CTLMASK : INT2_CTLMASK;
outb(ctl_mask, inb(ctl_mask) | (1 << (irq & 0x7)));
}
/* Disable 8259 - write 0xFF in OCW1 master and slave. */
PRIVATE void i8259_disable(void)
{
outb(INT2_CTLMASK, 0xFF);
outb(INT_CTLMASK, 0xFF);
inb(INT_CTLMASK);
}