93 lines
1.8 KiB
ArmAsm
93 lines
1.8 KiB
ArmAsm
#include "mips.h"
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/* s0-s7 not saved as this are callee saved registers
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* CO_STATUS is not saved as nested interrupts are not supported
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*
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* Separate irqstack is used for context save and irq processing
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* k0 holds the address of the top of this stack and k1 is used
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* to hold original sp value. Since we do not support nesting
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* there is nothing to warry about
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*/
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.extern irqvector
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.global irq_handler
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.set mips32r2
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.set noreorder
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.set noat
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.section .irq_vector,"ax",%progbits
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irq_handler:
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move k1, sp
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move sp, k0
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addiu sp, sp, -84
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/* context save */
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sw AT, 0(sp)
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sw v0, 4(sp)
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sw v1, 8(sp)
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sw a0, 12(sp)
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sw a1, 16(sp)
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sw a2, 20(sp)
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sw a3, 24(sp)
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sw t0, 28(sp)
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sw t1, 32(sp)
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sw t2, 36(sp)
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sw t3, 40(sp)
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sw t4, 44(sp)
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sw t5, 48(sp)
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sw t6, 52(sp)
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sw t7, 56(sp)
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sw t8, 60(sp)
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sw t9, 64(sp)
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sw fp, 68(sp)
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sw ra, 72(sp)
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mfhi t0
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mflo t1
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sw t0, 76(sp)
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sw t1, 80(sp)
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/* handle interrupt */
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lui t0, 0xb002 /* INTC base */
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lw t1, 0(t0) /* INTC_PD */
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lw t2 , 4(t0) /* INTC_MSK */
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and t1, t1, t2 /* mask */
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clz t1, t1
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sll t0, t1, 2 /* offset */
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la t1, irqvector
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addu t0, t1, t0 /* irq handler pointer address */
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lw t0, 0(t0)
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jalr t0 /* call handler function */
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nop
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/* context restore */
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lw t0, 76(sp)
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lw t1, 80(sp)
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mthi t0
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mtlo t1
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lw AT, 0(sp)
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lw v0, 4(sp)
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lw v1, 8(sp)
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lw a0, 12(sp)
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lw a1, 16(sp)
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lw a2, 20(sp)
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lw a3, 24(sp)
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lw t0, 28(sp)
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lw t1, 32(sp)
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lw t2, 36(sp)
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lw t3, 40(sp)
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lw t4, 44(sp)
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lw t5, 48(sp)
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lw t6, 52(sp)
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lw t7, 56(sp)
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lw t8, 60(sp)
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lw t9, 64(sp)
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lw fp, 68(sp)
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lw ra, 72(sp)
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addiu sp, sp, 84
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move sp, k1
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eret
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.set reorder
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.set at
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