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47 lines
698 B
ArmAsm
47 lines
698 B
ArmAsm
#include "hollywood.h"
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#include "irq.h"
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.globl v_irq
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.globl irq_setup_stack
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.globl irq_kill
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.globl irq_restore
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.extern __irqstack_addr
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.extern irq_handler
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irq_setup_stack:
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@ Switch to IRQ mode
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mrs r0, cpsr
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bic r1, r0, #0x1f
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orr r1, #0x12
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msr cpsr, r1
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@ Setup interrupt stack
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ldr sp, =__stack_addr
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add sp, r4
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@ Restore mode
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msr cpsr, r0
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bx lr
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v_irq:
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push {r0-r3, r9, r12, lr}
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blx irq_handler
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pop {r0-r3, r9, r12, lr}
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subs pc, lr, #4
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irq_kill:
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mrs r1, cpsr
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and r0, r1, #(CPSR_IRQDIS|CPSR_FIQDIS)
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orr r1, r1, #(CPSR_IRQDIS|CPSR_FIQDIS)
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msr cpsr, r1
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bx lr
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irq_restore:
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mrs r1, cpsr
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bic r1, r1, #(CPSR_IRQDIS|CPSR_FIQDIS)
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orr r1, r1, r0
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msr cpsr, r1
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bx lr
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