Changeset 8ab339e in mainline for kernel/arch/arm32/include/cycle.h
- Timestamp:
- 2013-02-26T10:58:29Z (11 years ago)
- Branches:
- lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export
- Children:
- b04ca9c
- Parents:
- 1935591 (diff), 088b334 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
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- 1 edited
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kernel/arch/arm32/include/cycle.h
r1935591 r8ab339e 38 38 39 39 #include <trace.h> 40 #include <arch/cp15.h> 40 41 41 42 /** Return count of CPU cycles. … … 48 49 NO_TRACE static inline uint64_t get_cycle(void) 49 50 { 51 #ifdef PROCESSOR_ARCH_armv7_a 52 if ((ID_PFR1_read() & ID_PFR1_GEN_TIMER_EXT_MASK) == 53 ID_PFR1_GEN_TIMER_EXT) { 54 uint32_t low = 0, high = 0; 55 asm volatile( "MRRC p15, 0, %[low], %[high], c14": [low]"=r"(low), [high]"=r"(high)); 56 return ((uint64_t)high << 32) | low; 57 } else { 58 return (uint64_t)PMCCNTR_read() * 64; 59 } 60 #endif 50 61 return 0; 51 62 }
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