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Fix new version of microtime.

This commit is contained in:
eeh 2000-09-12 04:16:29 +00:00
parent 78ae325de3
commit 5be9d50b09
1 changed files with 23 additions and 14 deletions
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37
sys/arch/sparc64/sparc64/locore.s
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@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.96 2000/09/11 23:29:31 eeh Exp $ */
/* $NetBSD: locore.s,v 1.97 2000/09/12 04:16:29 eeh Exp $ */
/*
* Copyright (c) 1996-1999 Eduardo Horvath
* Copyright (c) 1996 Paul Kranenburg
@ -11010,26 +11010,35 @@ microtick:
/*
* The following code only works if %tick is synchronized with time.
*/
sethi %hi(_C_LABEL(cpu_clockrate)), %o3
ldx [%o3 + %lo(_C_LABEL(cpu_clockrate) + 8)], %o4 ! Get scale factor
rdpr %tick, %o1
sethi %hi(MICROPERSEC), %o2
LDPTR [%g2+%lo(_C_LABEL(time))], %o2 ! time.tv_sec & time.tv_usec
LDPTR [%g2+%lo(_C_LABEL(time)+PTRSZ)], %o3 ! time.tv_sec & time.tv_usec
rdpr %tick, %o4 ! Load usec timer value
LDPTR [%g2+%lo(_C_LABEL(time))], %g1 ! see if time values changed
LDPTR [%g2+%lo(_C_LABEL(time)+PTRSZ)], %g5 ! see if time values changed
cmp %g1, %o2
bne 2b ! if time.tv_sec changed
cmp %g5, %o3
bne 2b ! if time.tv_usec changed
sethi %hi(_C_LABEL(cpu_clockrate)), %o1
ldx [%o1 + %lo(_C_LABEL(cpu_clockrate) + 8)], %o4 ! Get scale factor
sethi %hi(MICROPERSEC), %o5
brnz,pt %o4, 1f ! Already scaled?
or %o2, %lo(MICROPERSEC), %o2
or %o2, %lo(MICROPERSEC), %o5
!! Calculate ticks/usec
ldx [%o3 + %lo(_C_LABEL(cpu_clockrate))], %o4 ! No, we need to calculate it
udivx %o4, %o2, %o4 ! Hz / 10^6 = MHz
stx %o4, [%o3 + %lo(_C_LABEL(cpu_clockrate))] ! Save it so we don't need to divide again
ldx [%o1 + %lo(_C_LABEL(cpu_clockrate))], %o4 ! No, we need to calculate it
udivx %o4, %o5, %o4 ! Hz / 10^6 = MHz
stx %o4, [%o1 + %lo(_C_LABEL(cpu_clockrate) + 8)] ! Save it so we don't need to divide again
1:
udivx %o1, %o4, %o1 ! Scale it: ticks / MHz = usec
STPTR %o2, [%o0] ! Store seconds.
udivx %o4, %o1, %o4 ! Scale it: ticks / MHz = usec
udivx %o1, %o2, %o3 ! Now %o3 has seconds
STPTR %o3, [%o0] ! and store it
udivx %o4, %o5, %o2 ! Now %o2 has seconds
mulx %o3, %o2, %o2 ! Now calculate usecs -- damn no remainder insn
sub %o1, %o2, %o1 ! %o1 has the remainder
mulx %o3, %o5, %o5 ! Now calculate usecs -- damn no remainder insn
sub %o2, %o5, %o1 ! %o1 has the remainder
retl
STPTR %o1, [%o0+PTRSZ] ! Save time_t low word