forked from luck/tmp_suning_uos_patched
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>
38 lines
711 B
C
38 lines
711 B
C
#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);
|
|
}
|