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// Copyright 2018 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. //go:build !faketime #include "go_asm.h" #include "textflag.h" #include "time_windows.h" TEXT time·now(SB),NOSPLIT,$0-20 MOVW $_INTERRUPT_TIME, R3 loop: MOVW time_hi1(R3), R1 DMB MB_ISH MOVW time_lo(R3), R0 DMB MB_ISH MOVW time_hi2(R3), R2 CMP R1, R2 BNE loop // wintime = R1:R0, multiply by 100 MOVW $100, R2 MULLU R0, R2, (R4, R3) // R4:R3 = R1:R0 * R2 MULA R1, R2, R4, R4 // wintime*100 = R4:R3 MOVW R3, mono+12(FP) MOVW R4, mono+16(FP) MOVW $_SYSTEM_TIME, R3 wall: MOVW time_hi1(R3), R1 DMB MB_ISH MOVW time_lo(R3), R0 DMB MB_ISH MOVW time_hi2(R3), R2 CMP R1, R2 BNE wall // w = R1:R0 in 100ns untis // convert to Unix epoch (but still 100ns units) #define delta 116444736000000000 SUB.S $(delta & 0xFFFFFFFF), R0 SBC $(delta >> 32), R1 // Convert to nSec MOVW $100, R2 MULLU R0, R2, (R4, R3) // R4:R3 = R1:R0 * R2 MULA R1, R2, R4, R4 // w = R2:R1 in nSec MOVW R3, R1 // R4:R3 -> R2:R1 MOVW R4, R2 // multiply nanoseconds by reciprocal of 10**9 (scaled by 2**61) // to get seconds (96 bit scaled result) MOVW $0x89705f41, R3 // 2**61 * 10**-9 MULLU R1,R3,(R6,R5) // R7:R6:R5 = R2:R1 * R3 MOVW $0,R7 MULALU R2,R3,(R7,R6) // unscale by discarding low 32 bits, shifting the rest by 29 MOVW R6>>29,R6 // R7:R6 = (R7:R6:R5 >> 61) ORR R7<<3,R6 MOVW R7>>29,R7 // subtract (10**9 * sec) from nsec to get nanosecond remainder MOVW $1000000000, R5 // 10**9 MULLU R6,R5,(R9,R8) // R9:R8 = R7:R6 * R5 MULA R7,R5,R9,R9 SUB.S R8,R1 // R2:R1 -= R9:R8 SBC R9,R2 // because reciprocal was a truncated repeating fraction, quotient // may be slightly too small -- adjust to make remainder < 10**9 CMP R5,R1 // if remainder > 10**9 SUB.HS R5,R1 // remainder -= 10**9 ADD.HS $1,R6 // sec += 1 MOVW R6,sec_lo+0(FP) MOVW R7,sec_hi+4(FP) MOVW R1,nsec+8(FP) RET