tick14.c
上传用户:lgb322
上传日期:2013-02-24
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文件大小:2k
- /* 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 <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];
-
- void install_linux_ticker(void)
- {
- unsigned long flags;
- if (!linux_lvl14)
- return;
- save_and_cli(flags);
- linux_lvl14[0] = lvl14_save[0];
- linux_lvl14[1] = lvl14_save[1];
- linux_lvl14[2] = lvl14_save[2];
- linux_lvl14[3] = lvl14_save[3];
- restore_flags(flags);
- }
- void install_obp_ticker(void)
- {
- unsigned long flags;
-
- if (!linux_lvl14)
- return;
- save_and_cli(flags);
- linux_lvl14[0] = obp_lvl14[0];
- linux_lvl14[1] = obp_lvl14[1];
- linux_lvl14[2] = obp_lvl14[2];
- linux_lvl14[3] = obp_lvl14[3];
- restore_flags(flags);
- }
- void claim_ticker14(void (*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);
- }
- }