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[PATCH] mips: add support for Qemu system architecture

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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>
This commit is contained in:
Ralf Baechle
2005-09-03 15:56:11 -07:00
committed by Linus Torvalds
parent 7901c79982
commit 07119621e6
12 changed files with 839 additions and 0 deletions
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37
arch/mips/qemu/q-irq.c Normal file
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#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);
}