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/* 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_flags(flags); cli(); 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_flags(flags); cli(); 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 ) { /* 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(timeout); enable_irq(irq_nr); } } |