From 0a4d8a472f645d99f86303db1462b64e371b090d Mon Sep 17 00:00:00 2001 From: Glauber Costa Date: Tue, 24 Jun 2008 09:34:08 -0300 Subject: [PATCH] x86: provide delay loop for x86_64. This is for consistency with i386. We call use_tsc_delay() at tsc initialization for x86_64, so we'll be always using it. Signed-off-by: Glauber Costa Signed-off-by: H. Peter Anvin Signed-off-by: Ingo Molnar --- arch/x86/kernel/tsc.c | 1 + arch/x86/lib/delay_64.c | 44 +++++++++++++++++++++++++++++++++++++---- 2 files changed, 41 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index 3c36f92160c..4a775d00195 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -513,6 +513,7 @@ void __init tsc_init(void) */ for_each_possible_cpu(cpu) set_cyc2ns_scale(cpu_khz, cpu); + use_tsc_delay(); if (tsc_disabled > 0) return; diff --git a/arch/x86/lib/delay_64.c b/arch/x86/lib/delay_64.c index 4c441be9264..d0326d07c84 100644 --- a/arch/x86/lib/delay_64.c +++ b/arch/x86/lib/delay_64.c @@ -22,13 +22,28 @@ #include #endif -int __devinit read_current_timer(unsigned long *timer_value) +/* simple loop based delay: */ +static void delay_loop(unsigned long loops) { - rdtscll(*timer_value); - return 0; + asm volatile( + " test %0,%0 \n" + " jz 3f \n" + " jmp 1f \n" + + ".align 16 \n" + "1: jmp 2f \n" + + ".align 16 \n" + "2: dec %0 \n" + " jnz 2b \n" + "3: dec %0 \n" + + : /* we don't need output */ + :"a" (loops) + ); } -void __delay(unsigned long loops) +static void delay_tsc(unsigned long loops) { unsigned bclock, now; int cpu; @@ -63,6 +78,27 @@ void __delay(unsigned long loops) } preempt_enable(); } + +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_value) +{ + if (delay_fn == delay_tsc) { + rdtscll(*timer_value); + return 0; + } + return -1; +} + +void __delay(unsigned long loops) +{ + delay_fn(loops); +} EXPORT_SYMBOL(__delay); inline void __const_udelay(unsigned long xloops) -- 2.41.0