07119621e6
Add support for the virtual MIPS system that is emulated by Qemu. See http://www.linux-mips.org/wiki/Qemu for a detailed current status. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
37 lines
711 B
C
37 lines
711 B
C
#include <linux/init.h>
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#include <linux/linkage.h>
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#include <asm/i8259.h>
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#include <asm/mipsregs.h>
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#include <asm/qemu.h>
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#include <asm/system.h>
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#include <asm/time.h>
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extern asmlinkage void qemu_handle_int(void);
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asmlinkage void do_qemu_int(struct pt_regs *regs)
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{
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unsigned int pending = read_c0_status() & read_c0_cause();
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if (pending & 0x8000) {
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ll_timer_interrupt(Q_COUNT_COMPARE_IRQ, regs);
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return;
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}
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if (pending & 0x0400) {
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int irq = i8259_irq();
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if (likely(irq >= 0))
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do_IRQ(irq, regs);
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return;
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}
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}
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void __init arch_init_irq(void)
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{
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set_except_vector(0, qemu_handle_int);
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mips_hpt_frequency = QEMU_C0_COUNTER_CLOCK; /* 100MHz */
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init_i8259_irqs();
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set_c0_status(0x8400);
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}
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