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uboot-1.1.4-kirkwood/cpu/i386/interrupts.c

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u-boot 1.1.4
2024-01-07 23:57:24 +01:00
/*
* (C) Copyright 2002
* Daniel Engstr<EFBFBD>m, Omicron Ceti AB, daniel@omicron.se.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/i8259.h>
#include <asm/ibmpc.h>
struct idt_entry {
u16 base_low;
u16 selector;
u8 res;
u8 access;
u16 base_high;
} __attribute__ ((packed));
struct idt_entry idt[256];
#define MAX_IRQ 16
typedef struct irq_handler {
struct irq_handler *next;
interrupt_handler_t* isr_func;
void *isr_data;
} irq_handler_t;
#define IRQ_DISABLED 1
typedef struct {
irq_handler_t *handler;
unsigned long status;
} irq_desc_t;
static irq_desc_t irq_table[MAX_IRQ];
asm ("irq_return:\n"
" addl $4, %esp\n"
" popa\n"
" iret\n");
asm ("exp_return:\n"
" addl $12, %esp\n"
" pop %esp\n"
" popa\n"
" iret\n");
char exception_stack[4096];
#define DECLARE_INTERRUPT(x) \
asm(".globl irq_"#x"\n" \
"irq_"#x":\n" \
"pusha \n" \
"pushl $"#x"\n" \
"pushl $irq_return\n" \
"jmp do_irq\n"); \
void __attribute__ ((regparm(0))) irq_##x(void)
#define DECLARE_EXCEPTION(x, f) \
asm(".globl exp_"#x"\n" \
"exp_"#x":\n" \
"pusha \n" \
"movl %esp, %ebx\n" \
"movl $exception_stack, %eax\n" \
"movl %eax, %esp \n" \
"pushl %ebx\n" \
"movl 32(%esp), %ebx\n" \
"xorl %edx, %edx\n" \
"movw 36(%esp), %dx\n" \
"pushl %edx\n" \
"pushl %ebx\n" \
"pushl $"#x"\n" \
"pushl $exp_return\n" \
"jmp "#f"\n"); \
void __attribute__ ((regparm(0))) exp_##x(void)
DECLARE_EXCEPTION(0, divide_exception_entry); /* Divide exception */
DECLARE_EXCEPTION(1, debug_exception_entry); /* Debug exception */
DECLARE_EXCEPTION(2, nmi_entry); /* NMI */
DECLARE_EXCEPTION(3, unknown_exception_entry); /* Breakpoint/Coprocessor Error */
DECLARE_EXCEPTION(4, unknown_exception_entry); /* Overflow */
DECLARE_EXCEPTION(5, unknown_exception_entry); /* Bounds */
DECLARE_EXCEPTION(6, invalid_instruction_entry); /* Invalid instruction */
DECLARE_EXCEPTION(7, unknown_exception_entry); /* Device not present */
DECLARE_EXCEPTION(8, double_fault_entry); /* Double fault */
DECLARE_EXCEPTION(9, unknown_exception_entry); /* Co-processor segment overrun */
DECLARE_EXCEPTION(10, invalid_tss_exception_entry);/* Invalid TSS */
DECLARE_EXCEPTION(11, seg_fault_entry); /* Segment not present */
DECLARE_EXCEPTION(12, stack_fault_entry); /* Stack overflow */
DECLARE_EXCEPTION(13, gpf_entry); /* GPF */
DECLARE_EXCEPTION(14, page_fault_entry); /* PF */
DECLARE_EXCEPTION(15, unknown_exception_entry); /* Reserved */
DECLARE_EXCEPTION(16, fp_exception_entry); /* Floating point */
DECLARE_EXCEPTION(17, alignment_check_entry); /* alignment check */
DECLARE_EXCEPTION(18, machine_check_entry); /* machine check */
DECLARE_EXCEPTION(19, unknown_exception_entry); /* Reserved */
DECLARE_EXCEPTION(20, unknown_exception_entry); /* Reserved */
DECLARE_EXCEPTION(21, unknown_exception_entry); /* Reserved */
DECLARE_EXCEPTION(22, unknown_exception_entry); /* Reserved */
DECLARE_EXCEPTION(23, unknown_exception_entry); /* Reserved */
DECLARE_EXCEPTION(24, unknown_exception_entry); /* Reserved */
DECLARE_EXCEPTION(25, unknown_exception_entry); /* Reserved */
DECLARE_EXCEPTION(26, unknown_exception_entry); /* Reserved */
DECLARE_EXCEPTION(27, unknown_exception_entry); /* Reserved */
DECLARE_EXCEPTION(28, unknown_exception_entry); /* Reserved */
DECLARE_EXCEPTION(29, unknown_exception_entry); /* Reserved */
DECLARE_EXCEPTION(30, unknown_exception_entry); /* Reserved */
DECLARE_EXCEPTION(31, unknown_exception_entry); /* Reserved */
DECLARE_INTERRUPT(0);
DECLARE_INTERRUPT(1);
DECLARE_INTERRUPT(3);
DECLARE_INTERRUPT(4);
DECLARE_INTERRUPT(5);
DECLARE_INTERRUPT(6);
DECLARE_INTERRUPT(7);
DECLARE_INTERRUPT(8);
DECLARE_INTERRUPT(9);
DECLARE_INTERRUPT(10);
DECLARE_INTERRUPT(11);
DECLARE_INTERRUPT(12);
DECLARE_INTERRUPT(13);
DECLARE_INTERRUPT(14);
DECLARE_INTERRUPT(15);
void __attribute__ ((regparm(0))) default_isr(void);
asm ("default_isr: iret\n");
void disable_irq(int irq)
{
if (irq >= MAX_IRQ) {
return;
}
irq_table[irq].status |= IRQ_DISABLED;
}
void enable_irq(int irq)
{
if (irq >= MAX_IRQ) {
return;
}
irq_table[irq].status &= ~IRQ_DISABLED;
}
/* masks one specific IRQ in the PIC */
static void unmask_irq(int irq)
{
int imr_port;
if (irq >= MAX_IRQ) {
return;
}
if (irq > 7) {
imr_port = SLAVE_PIC + IMR;
} else {
imr_port = MASTER_PIC + IMR;
}
outb(inb(imr_port)&~(1<<(irq&7)), imr_port);
}
/* unmasks one specific IRQ in the PIC */
static void mask_irq(int irq)
{
int imr_port;
if (irq >= MAX_IRQ) {
return;
}
if (irq > 7) {
imr_port = SLAVE_PIC + IMR;
} else {
imr_port = MASTER_PIC + IMR;
}
outb(inb(imr_port)|(1<<(irq&7)), imr_port);
}
/* issue a Specific End Of Interrupt instruciton */
static void specific_eoi(int irq)
{
/* If it is on the slave PIC this have to be performed on
* both the master and the slave PICs */
if (irq > 7) {
outb(OCW2_SEOI|(irq&7), SLAVE_PIC + OCW2);
irq = SEOI_IR2; /* also do IR2 on master */
}
outb(OCW2_SEOI|irq, MASTER_PIC + OCW2);
}
void __attribute__ ((regparm(0))) do_irq(int irq)
{
mask_irq(irq);
if (irq_table[irq].status & IRQ_DISABLED) {
unmask_irq(irq);
specific_eoi(irq);
return;
}
if (NULL != irq_table[irq].handler) {
irq_handler_t *handler;
for (handler = irq_table[irq].handler;
NULL!= handler; handler = handler->next) {
handler->isr_func(handler->isr_data);
}
} else {
if ((irq & 7) != 7) {
printf("Spurious irq %d\n", irq);
}
}
unmask_irq(irq);
specific_eoi(irq);
}
void __attribute__ ((regparm(0))) unknown_exception_entry(int cause, int ip, int seg)
{
printf("Unknown Exception %d at %04x:%08x\n", cause, seg, ip);
}
void __attribute__ ((regparm(0))) divide_exception_entry(int cause, int ip, int seg)
{
printf("Divide Error (Division by zero) at %04x:%08x\n", seg, ip);
while(1);
}
void __attribute__ ((regparm(0))) debug_exception_entry(int cause, int ip, int seg)
{
printf("Debug Interrupt (Single step) at %04x:%08x\n", seg, ip);
}
void __attribute__ ((regparm(0))) nmi_entry(int cause, int ip, int seg)
{
printf("NMI Interrupt at %04x:%08x\n", seg, ip);
}
void __attribute__ ((regparm(0))) invalid_instruction_entry(int cause, int ip, int seg)
{
printf("Invalid Instruction at %04x:%08x\n", seg, ip);
while(1);
}
void __attribute__ ((regparm(0))) double_fault_entry(int cause, int ip, int seg)
{
printf("Double fault at %04x:%08x\n", seg, ip);
while(1);
}
void __attribute__ ((regparm(0))) invalid_tss_exception_entry(int cause, int ip, int seg)
{
printf("Invalid TSS at %04x:%08x\n", seg, ip);
}
void __attribute__ ((regparm(0))) seg_fault_entry(int cause, int ip, int seg)
{
printf("Segmentation fault at %04x:%08x\n", seg, ip);
while(1);
}
void __attribute__ ((regparm(0))) stack_fault_entry(int cause, int ip, int seg)
{
printf("Stack fault at %04x:%08x\n", seg, ip);
while(1);
}
void __attribute__ ((regparm(0))) gpf_entry(int cause, int ip, int seg)
{
printf("General protection fault at %04x:%08x\n", seg, ip);
}
void __attribute__ ((regparm(0))) page_fault_entry(int cause, int ip, int seg)
{
printf("Page fault at %04x:%08x\n", seg, ip);
while(1);
}
void __attribute__ ((regparm(0))) fp_exception_entry(int cause, int ip, int seg)
{
printf("Floating point exception at %04x:%08x\n", seg, ip);
}
void __attribute__ ((regparm(0))) alignment_check_entry(int cause, int ip, int seg)
{
printf("Alignment check at %04x:%08x\n", seg, ip);
}
void __attribute__ ((regparm(0))) machine_check_entry(int cause, int ip, int seg)
{
printf("Machine check exception at %04x:%08x\n", seg, ip);
}
void irq_install_handler(int ino, interrupt_handler_t *func, void *pdata)
{
int status;
if (ino>MAX_IRQ) {
return;
}
if (NULL != irq_table[ino].handler) {
return;
}
status = disable_interrupts();
irq_table[ino].handler = malloc(sizeof(irq_handler_t));
if (NULL == irq_table[ino].handler) {
return;
}
memset(irq_table[ino].handler, 0, sizeof(irq_handler_t));
irq_table[ino].handler->isr_func = func;
irq_table[ino].handler->isr_data = pdata;
if (status) {
enable_interrupts();
}
unmask_irq(ino);
return;
}
void irq_free_handler(int ino)
{
int status;
if (ino>MAX_IRQ) {
return;
}
status = disable_interrupts();
mask_irq(ino);
if (NULL == irq_table[ino].handler) {
return;
}
free(irq_table[ino].handler);
irq_table[ino].handler=NULL;
if (status) {
enable_interrupts();
}
return;
}
asm ("idt_ptr:\n"
".word 0x800\n" /* size of the table 8*256 bytes */
".long idt\n" /* offset */
".word 0x18\n");/* data segment */
static void set_vector(int intnum, void *routine)
{
idt[intnum].base_high = (u16)((u32)(routine)>>16);
idt[intnum].base_low = (u16)((u32)(routine)&0xffff);
}
int interrupt_init(void)
{
int i;
/* Just in case... */
disable_interrupts();
/* Initialize the IDT and stuff */
memset(irq_table, 0, sizeof(irq_table));
/* Setup the IDT */
for (i=0;i<256;i++) {
idt[i].access = 0x8e;
idt[i].res = 0;
idt[i].selector = 0x10;
set_vector(i, default_isr);
}
asm ("cs lidt idt_ptr\n");
/* Setup exceptions */
set_vector(0x00, exp_0);
set_vector(0x01, exp_1);
set_vector(0x02, exp_2);
set_vector(0x03, exp_3);
set_vector(0x04, exp_4);
set_vector(0x05, exp_5);
set_vector(0x06, exp_6);
set_vector(0x07, exp_7);
set_vector(0x08, exp_8);
set_vector(0x09, exp_9);
set_vector(0x0a, exp_10);
set_vector(0x0b, exp_11);
set_vector(0x0c, exp_12);
set_vector(0x0d, exp_13);
set_vector(0x0e, exp_14);
set_vector(0x0f, exp_15);
set_vector(0x10, exp_16);
set_vector(0x11, exp_17);
set_vector(0x12, exp_18);
set_vector(0x13, exp_19);
set_vector(0x14, exp_20);
set_vector(0x15, exp_21);
set_vector(0x16, exp_22);
set_vector(0x17, exp_23);
set_vector(0x18, exp_24);
set_vector(0x19, exp_25);
set_vector(0x1a, exp_26);
set_vector(0x1b, exp_27);
set_vector(0x1c, exp_28);
set_vector(0x1d, exp_29);
set_vector(0x1e, exp_30);
set_vector(0x1f, exp_31);
/* Setup interrupts */
set_vector(0x20, irq_0);
set_vector(0x21, irq_1);
set_vector(0x23, irq_3);
set_vector(0x24, irq_4);
set_vector(0x25, irq_5);
set_vector(0x26, irq_6);
set_vector(0x27, irq_7);
set_vector(0x28, irq_8);
set_vector(0x29, irq_9);
set_vector(0x2a, irq_10);
set_vector(0x2b, irq_11);
set_vector(0x2c, irq_12);
set_vector(0x2d, irq_13);
set_vector(0x2e, irq_14);
set_vector(0x2f, irq_15);
/* vectors 0x30-0x3f are reserved for irq 16-31 */
/* Mask all interrupts */
outb(0xff, MASTER_PIC + IMR);
outb(0xff, SLAVE_PIC + IMR);
/* Master PIC */
outb(ICW1_SEL|ICW1_EICW4, MASTER_PIC + ICW1);
outb(0x20, MASTER_PIC + ICW2); /* Place master PIC interrupts at INT20 */
outb(IR2, MASTER_PIC + ICW3); /* ICW3, One slevc PIC is present */
outb(ICW4_PM, MASTER_PIC + ICW4);
for (i=0;i<8;i++) {
outb(OCW2_SEOI|i, MASTER_PIC + OCW2);
}
/* Slave PIC */
outb(ICW1_SEL|ICW1_EICW4, SLAVE_PIC + ICW1);
outb(0x28, SLAVE_PIC + ICW2); /* Place slave PIC interrupts at INT28 */
outb(0x02, SLAVE_PIC + ICW3); /* Slave ID */
outb(ICW4_PM, SLAVE_PIC + ICW4);
for (i=0;i<8;i++) {
outb(OCW2_SEOI|i, SLAVE_PIC + OCW2);
}
/* enable cascade interrerupt */
outb(0xfb, MASTER_PIC + IMR);
outb(0xff, SLAVE_PIC + IMR);
/* It is now safe to enable interrupts */
enable_interrupts();
return 0;
}
void enable_interrupts(void)
{
asm("sti\n");
}
int disable_interrupts(void)
{
long flags;
asm volatile ("pushfl ; popl %0 ; cli\n" : "=g" (flags) : );
return (flags&0x200); /* IE flags is bit 9 */
}
#ifdef CFG_RESET_GENERIC
void __attribute__ ((regparm(0))) generate_gpf(void);
asm(".globl generate_gpf\n"
"generate_gpf:\n"
"ljmp $0x70, $0x47114711\n"); /* segment 0x70 is an arbitrary segment which does not
* exist */
void reset_cpu(ulong addr)
{
set_vector(13, generate_gpf); /* general protection fault handler */
set_vector(8, generate_gpf); /* double fault handler */
generate_gpf(); /* start the show */
}
#endif
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