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55 lines
976 B
ArmAsm
55 lines
976 B
ArmAsm
/*
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mini - a Free Software replacement for the Nintendo/BroadOn IOS.
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IRQ support
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Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
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# This code is licensed to you under the terms of the GNU GPL, version 2;
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# see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
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*/
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#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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msr cpsr_c, #0xd2
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@ Setup interrupt stack
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ldr sp, =__irqstack_addr
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@ Restore mode
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msr cpsr_c, 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_c, 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_c, r1
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bx lr
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