*/
#include <common.h>
-#include <syscall.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/i8259.h>
#include <asm/ibmpc.h>
-#if 0
-/* done */
-int interrupt_init (void);
-void irq_install_handler(int, interrupt_handler_t *, void *);
-void irq_free_handler (int);
-void enable_interrupts (void);
-int disable_interrupts (void);
-
-/* todo */
-void timer_interrupt (struct pt_regs *);
-void external_interrupt (struct pt_regs *);
-void reset_timer (void);
-ulong get_timer (ulong base);
-void set_timer (ulong t);
-
-#endif
-
struct idt_entry {
u16 base_low;
u16 selector;
#define MAX_IRQ 16
-typedef struct irq_handler {
+typedef struct irq_handler {
struct irq_handler *next;
interrupt_handler_t* isr_func;
void *isr_data;
static irq_desc_t irq_table[MAX_IRQ];
-
-/* syscall stuff, very untested
- * the current approach which includes copying
- * part of the stack will work badly for
- * varargs functions.
- * if we were to store the top three words on the
- * stack (eip, ss, eflags) somwhere and add 14 to
- * %esp ....
- */
-asm(".globl syscall_entry\n" \
- "syscall_entry:\n" \
- "movl 12(%esp), %eax\n" \
- "movl %esp, %ebx\n" \
- "addl $16, %ebx\n" \
- "pushl %ebx\n" \
- "pushl %eax\n" \
- "call do_syscall\n" \
- "addl $8, %esp\n" \
- "iret\n");
-
-void __attribute__ ((regparm(0))) syscall_entry(void);
-
-int __attribute__ ((regparm(0))) do_syscall(u32 nr, u32 *stack)
-{
- if (nr<NR_SYSCALLS) {
- /* We copy 8 args of the syscall,
- * this will be a problem with the
- * printf syscall .... */
- int (*fp)(u32, u32, u32, u32,
- u32, u32, u32, u32);
- fp = syscall_tbl[nr];
- return fp(stack[0], stack[1], stack[2], stack[3],
- stack[4], stack[5], stack[6], stack[7]);
- }
-
- return -1;
-}
-
-
asm ("irq_return:\n"
" addl $4, %esp\n"
" popa\n"
"pusha \n" \
"pushl $"#x"\n" \
"pushl $irq_return\n" \
- "jmp do_irq\n"); \
+ "jmp do_irq\n"); \
void __attribute__ ((regparm(0))) irq_##x(void)
#define DECLARE_EXCEPTION(x, f) \
DECLARE_INTERRUPT(13);
DECLARE_INTERRUPT(14);
DECLARE_INTERRUPT(15);
-
-void __attribute__ ((regparm(0))) default_isr(void);
+
+void __attribute__ ((regparm(0))) default_isr(void);
asm ("default_isr: iret\n");
-void disable_irq(int irq)
+void disable_irq(int irq)
{
if (irq >= MAX_IRQ) {
return;
}
irq_table[irq].status |= IRQ_DISABLED;
-
+
}
-void enable_irq(int irq)
+void enable_irq(int irq)
{
if (irq >= MAX_IRQ) {
return;
static void unmask_irq(int irq)
{
int imr_port;
-
+
if (irq >= MAX_IRQ) {
return;
}
} else {
imr_port = MASTER_PIC + IMR;
}
-
+
outb(inb(imr_port)&~(1<<(irq&7)), imr_port);
}
static void mask_irq(int irq)
{
int imr_port;
-
+
if (irq >= MAX_IRQ) {
return;
}
} else {
imr_port = MASTER_PIC + IMR;
}
-
- outb(inb(imr_port)|(1<<(irq&7)), imr_port);
+
+ outb(inb(imr_port)|(1<<(irq&7)), imr_port);
}
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)
+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;
+ for (handler = irq_table[irq].handler;
NULL!= handler; handler = handler->next) {
handler->isr_func(handler->isr_data);
}
} else {
- if ((irq & 7) != 7) {
+ if ((irq & 7) != 7) {
printf("Spurious irq %d\n", irq);
}
- }
+ }
unmask_irq(irq);
- specific_eoi(irq);
+ specific_eoi(irq);
}
-void __attribute__ ((regparm(0))) unknown_exception_entry(int cause, int ip, int seg)
+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)
+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)
+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)
+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)
+
+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)
+
+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)
+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)
+
+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)
+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)
+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)
+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)
+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)
+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)
+
+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;
}
if (ino>MAX_IRQ) {
return;
}
-
+
status = disable_interrupts();
mask_irq(ino);
if (NULL == irq_table[ino].handler) {
static void set_vector(int 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)>>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++) {
+ for (i=0;i<256;i++) {
idt[i].access = 0x8e;
- idt[i].res = 0;
- idt[i].selector = 0x10;
+ 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(0x2e, irq_14);
set_vector(0x2f, irq_15);
/* vectors 0x30-0x3f are reserved for irq 16-31 */
- set_vector(0x40, syscall_entry);
-
+
/* Mask all interrupts */
outb(0xff, MASTER_PIC + IMR);
outb(0xff, SLAVE_PIC + IMR);
-
+
/* Master PIC */
- outb(ICW1_SEL|ICW1_EICW4, MASTER_PIC + ICW1);
+ 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(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(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);
-
+ 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();
-
+ enable_interrupts();
+
return 0;
}
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
+#ifdef CONFIG_SYS_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
+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)
{
projects / karo-tx-uboot.git / blobdiff