*/
#include <common.h>
-#include <malloc.h>
-#include <asm/io.h>
-#include <asm/i8259.h>
-#include <asm/ibmpc.h>
+#include <asm/interrupt.h>
struct idt_entry {
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"
+asm (".globl irq_return\n"
+ "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)
+void set_vector(u8 intnum, void *routine)
{
- idt[intnum].base_high = (u16)((u32)(routine)>>16);
- idt[intnum].base_low = (u16)((u32)(routine)&0xffff);
+ idt[intnum].base_high = (u16)((u32)(routine + gd->reloc_off) >> 16);
+ idt[intnum].base_low = (u16)((u32)(routine + gd->reloc_off) & 0xffff);
}
-int interrupt_init(void)
+int cpu_init_interrupts(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;
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 (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
projects / karo-tx-uboot.git / blobdiff