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| author | Glauber Costa <gcosta@redhat.com> | 2008-06-24 09:34:08 -0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-09 08:51:41 +0200 |
| commit | 0a4d8a472f645d99f86303db1462b64e371b090d (patch) | |
| tree | dd6b4b3d4a5cb415b06e8e1625ea811a9012119d /arch/x86 | |
| parent | ff1b15b646177c6cc465ac2dd0be6ae16e965654 (diff) | |
| download | linux-0a4d8a472f645d99f86303db1462b64e371b090d.tar.gz linux-0a4d8a472f645d99f86303db1462b64e371b090d.tar.bz2 linux-0a4d8a472f645d99f86303db1462b64e371b090d.zip | |
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 <gcosta@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/tsc.c | 1 | ||||
| -rw-r--r-- | 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 3c36f92160c9..4a775d001957 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 4c441be92641..d0326d07c845 100644 --- a/arch/x86/lib/delay_64.c +++ b/arch/x86/lib/delay_64.c @@ -22,13 +22,28 @@ #include <asm/smp.h> #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) |