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authorIngo Molnar <mingo@elte.hu>2008-07-18 19:31:12 +0200
committerIngo Molnar <mingo@elte.hu>2008-07-18 19:31:12 +0200
commit3e370b29d35fb01bfb92c2814d6f79bf6a2cb970 (patch)
tree3b8fb467d60bfe6a34686f4abdc3a60050ba40a4 /arch/x86/lib/delay_32.c
parent88d1dce3a74367291f65a757fbdcaf17f042f30c (diff)
parent5b664cb235e97afbf34db9c4d77f08ebd725335e (diff)
Merge branch 'linus' into x86/pci-ioapic-boot-irq-quirks
Conflicts: drivers/pci/quirks.c Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/lib/delay_32.c')
-rw-r--r--arch/x86/lib/delay_32.c138
1 files changed, 0 insertions, 138 deletions
diff --git a/arch/x86/lib/delay_32.c b/arch/x86/lib/delay_32.c
deleted file mode 100644
index ef691316f8b6..000000000000
--- a/arch/x86/lib/delay_32.c
+++ /dev/null
@@ -1,138 +0,0 @@
-/*
- * Precise Delay Loops for i386
- *
- * Copyright (C) 1993 Linus Torvalds
- * Copyright (C) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
- * Copyright (C) 2008 Jiri Hladky <hladky _dot_ jiri _at_ gmail _dot_ com>
- *
- * The __delay function must _NOT_ be inlined as its execution time
- * depends wildly on alignment on many x86 processors. The additional
- * jump magic is needed to get the timing stable on all the CPU's
- * we have to worry about.
- */
-
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/timex.h>
-#include <linux/preempt.h>
-#include <linux/delay.h>
-#include <linux/init.h>
-
-#include <asm/processor.h>
-#include <asm/delay.h>
-#include <asm/timer.h>
-
-#ifdef CONFIG_SMP
-# include <asm/smp.h>
-#endif
-
-/* simple loop based delay: */
-static void delay_loop(unsigned long loops)
-{
- __asm__ __volatile__(
- " test %0,%0 \n"
- " jz 3f \n"
- " jmp 1f \n"
-
- ".align 16 \n"
- "1: jmp 2f \n"
-
- ".align 16 \n"
- "2: decl %0 \n"
- " jnz 2b \n"
- "3: decl %0 \n"
-
- : /* we don't need output */
- :"a" (loops)
- );
-}
-
-/* TSC based delay: */
-static void delay_tsc(unsigned long loops)
-{
- unsigned long bclock, now;
- int cpu;
-
- preempt_disable();
- cpu = smp_processor_id();
- rdtscl(bclock);
- for (;;) {
- rdtscl(now);
- if ((now - bclock) >= loops)
- break;
-
- /* Allow RT tasks to run */
- preempt_enable();
- rep_nop();
- preempt_disable();
-
- /*
- * It is possible that we moved to another CPU, and
- * since TSC's are per-cpu we need to calculate
- * that. The delay must guarantee that we wait "at
- * least" the amount of time. Being moved to another
- * CPU could make the wait longer but we just need to
- * make sure we waited long enough. Rebalance the
- * counter for this CPU.
- */
- if (unlikely(cpu != smp_processor_id())) {
- loops -= (now - bclock);
- cpu = smp_processor_id();
- rdtscl(bclock);
- }
- }
- preempt_enable();
-}
-
-/*
- * Since we calibrate only once at boot, this
- * function should be set once at boot and not changed
- */
-static void (*delay_fn)(unsigned long) = delay_loop;
-
-void use_tsc_delay(void)
-{
- delay_fn = delay_tsc;
-}
-
-int __devinit read_current_timer(unsigned long *timer_val)
-{
- if (delay_fn == delay_tsc) {
- rdtscl(*timer_val);
- return 0;
- }
- return -1;
-}
-
-void __delay(unsigned long loops)
-{
- delay_fn(loops);
-}
-
-inline void __const_udelay(unsigned long xloops)
-{
- int d0;
-
- xloops *= 4;
- __asm__("mull %0"
- :"=d" (xloops), "=&a" (d0)
- :"1" (xloops), "0"
- (cpu_data(raw_smp_processor_id()).loops_per_jiffy * (HZ/4)));
-
- __delay(++xloops);
-}
-
-void __udelay(unsigned long usecs)
-{
- __const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */
-}
-
-void __ndelay(unsigned long nsecs)
-{
- __const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */
-}
-
-EXPORT_SYMBOL(__delay);
-EXPORT_SYMBOL(__const_udelay);
-EXPORT_SYMBOL(__udelay);
-EXPORT_SYMBOL(__ndelay);