Eric Biederman | c84c190 | 2004-10-14 20:13:01 +0000 | [diff] [blame] | 1 | #ifndef CPU_X86_TSC_H |
| 2 | #define CPU_X86_TSC_H |
| 3 | |
Aaron Durbin | a86e81d | 2014-01-27 15:07:26 -0600 | [diff] [blame] | 4 | #include <stdint.h> |
| 5 | |
Stefan Reinauer | 0db6820 | 2012-08-07 14:44:51 -0700 | [diff] [blame] | 6 | #if CONFIG_TSC_SYNC_MFENCE |
| 7 | #define TSC_SYNC "mfence\n" |
| 8 | #elif CONFIG_TSC_SYNC_LFENCE |
| 9 | #define TSC_SYNC "lfence\n" |
| 10 | #else |
| 11 | #define TSC_SYNC |
| 12 | #endif |
| 13 | |
Eric Biederman | c84c190 | 2004-10-14 20:13:01 +0000 | [diff] [blame] | 14 | struct tsc_struct { |
| 15 | unsigned lo; |
| 16 | unsigned hi; |
| 17 | }; |
| 18 | typedef struct tsc_struct tsc_t; |
| 19 | |
Stefan Reinauer | 348a1ba | 2010-03-17 01:51:11 +0000 | [diff] [blame] | 20 | static inline tsc_t rdtsc(void) |
Eric Biederman | c84c190 | 2004-10-14 20:13:01 +0000 | [diff] [blame] | 21 | { |
| 22 | tsc_t res; |
Stefan Reinauer | 0db6820 | 2012-08-07 14:44:51 -0700 | [diff] [blame] | 23 | asm volatile ( |
| 24 | TSC_SYNC |
Eric Biederman | c84c190 | 2004-10-14 20:13:01 +0000 | [diff] [blame] | 25 | "rdtsc" |
| 26 | : "=a" (res.lo), "=d"(res.hi) /* outputs */ |
Stefan Reinauer | 0db6820 | 2012-08-07 14:44:51 -0700 | [diff] [blame] | 27 | ); |
Eric Biederman | c84c190 | 2004-10-14 20:13:01 +0000 | [diff] [blame] | 28 | return res; |
| 29 | } |
| 30 | |
Stefan Reinauer | 35b6bbb | 2010-03-28 21:26:54 +0000 | [diff] [blame] | 31 | #if !defined(__ROMCC__) |
Ronald G. Minnich | 5750fdd | 2013-05-08 17:08:55 +0200 | [diff] [blame] | 32 | /* Simple 32- to 64-bit multiplication. Uses 16-bit words to avoid overflow. |
| 33 | * This code is used to prevent use of libgcc's umoddi3. |
| 34 | */ |
| 35 | static inline void multiply_to_tsc(tsc_t *const tsc, const u32 a, const u32 b) |
| 36 | { |
| 37 | tsc->lo = (a & 0xffff) * (b & 0xffff); |
| 38 | tsc->hi = ((tsc->lo >> 16) |
| 39 | + ((a & 0xffff) * (b >> 16)) |
| 40 | + ((b & 0xffff) * (a >> 16))); |
| 41 | tsc->lo = ((tsc->hi & 0xffff) << 16) | (tsc->lo & 0xffff); |
| 42 | tsc->hi = ((a >> 16) * (b >> 16)) + (tsc->hi >> 16); |
| 43 | } |
| 44 | |
Stefan Reinauer | 35b6bbb | 2010-03-28 21:26:54 +0000 | [diff] [blame] | 45 | /* Too many registers for ROMCC */ |
Eric Biederman | c84c190 | 2004-10-14 20:13:01 +0000 | [diff] [blame] | 46 | static inline unsigned long long rdtscll(void) |
| 47 | { |
| 48 | unsigned long long val; |
Stefan Reinauer | 0db6820 | 2012-08-07 14:44:51 -0700 | [diff] [blame] | 49 | asm volatile ( |
| 50 | TSC_SYNC |
| 51 | "rdtsc" |
| 52 | : "=A" (val) |
| 53 | ); |
Eric Biederman | c84c190 | 2004-10-14 20:13:01 +0000 | [diff] [blame] | 54 | return val; |
| 55 | } |
Eric Biederman | c84c190 | 2004-10-14 20:13:01 +0000 | [diff] [blame] | 56 | #endif |
| 57 | |
Aaron Durbin | 8e73b5d | 2013-05-01 15:27:09 -0500 | [diff] [blame] | 58 | #if CONFIG_TSC_CONSTANT_RATE |
| 59 | unsigned long tsc_freq_mhz(void); |
| 60 | #endif |
| 61 | |
Eric Biederman | c84c190 | 2004-10-14 20:13:01 +0000 | [diff] [blame] | 62 | #endif /* CPU_X86_TSC_H */ |