diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 2005-09-03 15:56:11 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@evo.osdl.org> | 2005-09-05 00:06:04 -0700 |
| commit | 07119621e62de0a2c8db6e4896e762c498bfdd17 (patch) | |
| tree | c62dd52e8072235c8148e7f31b16ed30c5e45343 /arch/mips/qemu/q-irq.c | |
| parent | 7901c7998267d9d8c3f1b226a8c8cfd7f8e48a01 (diff) | |
[PATCH] mips: add support for Qemu system architecture
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>
Diffstat (limited to 'arch/mips/qemu/q-irq.c')
| -rw-r--r-- | arch/mips/qemu/q-irq.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/mips/qemu/q-irq.c b/arch/mips/qemu/q-irq.c new file mode 100644 index 00000000000..2c4e0704ff1 --- /dev/null +++ b/arch/mips/qemu/q-irq.c @@ -0,0 +1,37 @@ +#include <linux/init.h> +#include <linux/linkage.h> + +#include <asm/i8259.h> +#include <asm/mipsregs.h> +#include <asm/qemu.h> +#include <asm/system.h> +#include <asm/time.h> + +extern asmlinkage void qemu_handle_int(void); + +asmlinkage void do_qemu_int(struct pt_regs *regs) +{ + unsigned int pending = read_c0_status() & read_c0_cause(); + + if (pending & 0x8000) { + ll_timer_interrupt(Q_COUNT_COMPARE_IRQ, regs); + return; + } + if (pending & 0x0400) { + int irq = i8259_irq(); + + if (likely(irq >= 0)) + do_IRQ(irq, regs); + + return; + } +} + +void __init arch_init_irq(void) +{ + set_except_vector(0, qemu_handle_int); + mips_hpt_frequency = QEMU_C0_COUNTER_CLOCK; /* 100MHz */ + + init_i8259_irqs(); + set_c0_status(0x8400); +} |