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