diff options
Diffstat (limited to 'arch/arm/cpu/armv8/cpu.c')
| -rw-r--r-- | arch/arm/cpu/armv8/cpu.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv8/cpu.c b/arch/arm/cpu/armv8/cpu.c index 5dcb5e290b..28a27f724e 100644 --- a/arch/arm/cpu/armv8/cpu.c +++ b/arch/arm/cpu/armv8/cpu.c @@ -17,6 +17,20 @@ #include <asm/secure.h> #include <linux/compiler.h> +/* + * sdelay() - simple spin loop. + * + * Will delay execution by roughly (@loops * 2) cycles. + * This is necessary to be used before timers are accessible. + * + * A value of "0" will results in 2^64 loops. + */ +void sdelay(unsigned long loops) +{ + __asm__ volatile ("1:\n" "subs %0, %0, #1\n" + "b.ne 1b" : "=r" (loops) : "0"(loops) : "cc"); +} + int cleanup_before_linux(void) { /* |