1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
/* tick14.c
|
|
* linux/arch/sparc/kernel/tick14.c
|
|
*
|
|
* Copyright (C) 1996 David Redman (djhr@tadpole.co.uk)
|
|
*
|
|
* This file handles the Sparc specific level14 ticker
|
|
* This is really useful for profiling OBP uses it for keyboard
|
|
* aborts and other stuff.
|
|
*
|
|
*
|
|
*/
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/param.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/timex.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <asm/oplib.h>
|
|
#include <asm/segment.h>
|
|
#include <asm/timer.h>
|
|
#include <asm/mostek.h>
|
|
#include <asm/system.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/io.h>
|
|
|
|
extern unsigned long lvl14_save[5];
|
|
static unsigned long *linux_lvl14 = NULL;
|
|
static unsigned long obp_lvl14[4];
|
|
|
|
/*
|
|
* Call with timer IRQ closed.
|
|
* First time we do it with disable_irq, later prom code uses spin_lock_irq().
|
|
*/
|
|
void install_linux_ticker(void)
|
|
{
|
|
|
|
if (!linux_lvl14)
|
|
return;
|
|
linux_lvl14[0] = lvl14_save[0];
|
|
linux_lvl14[1] = lvl14_save[1];
|
|
linux_lvl14[2] = lvl14_save[2];
|
|
linux_lvl14[3] = lvl14_save[3];
|
|
}
|
|
|
|
void install_obp_ticker(void)
|
|
{
|
|
|
|
if (!linux_lvl14)
|
|
return;
|
|
linux_lvl14[0] = obp_lvl14[0];
|
|
linux_lvl14[1] = obp_lvl14[1];
|
|
linux_lvl14[2] = obp_lvl14[2];
|
|
linux_lvl14[3] = obp_lvl14[3];
|
|
}
|
|
|
|
void claim_ticker14(irqreturn_t (*handler)(int, void *, struct pt_regs *),
|
|
int irq_nr, unsigned int timeout )
|
|
{
|
|
int cpu = smp_processor_id();
|
|
|
|
/* first we copy the obp handler instructions
|
|
*/
|
|
disable_irq(irq_nr);
|
|
if (!handler)
|
|
return;
|
|
|
|
linux_lvl14 = (unsigned long *)lvl14_save[4];
|
|
obp_lvl14[0] = linux_lvl14[0];
|
|
obp_lvl14[1] = linux_lvl14[1];
|
|
obp_lvl14[2] = linux_lvl14[2];
|
|
obp_lvl14[3] = linux_lvl14[3];
|
|
|
|
if (!request_irq(irq_nr,
|
|
handler,
|
|
(SA_INTERRUPT | SA_STATIC_ALLOC),
|
|
"counter14",
|
|
NULL)) {
|
|
install_linux_ticker();
|
|
load_profile_irq(cpu, timeout);
|
|
enable_irq(irq_nr);
|
|
}
|
|
}
|