diff options
Diffstat (limited to 'arch/powerpc/kernel/vdso32/gettimeofday.S')
| -rw-r--r-- | arch/powerpc/kernel/vdso32/gettimeofday.S | 119 |
1 files changed, 84 insertions, 35 deletions
diff --git a/arch/powerpc/kernel/vdso32/gettimeofday.S b/arch/powerpc/kernel/vdso32/gettimeofday.S index 3306672f57a9..a3951567118a 100644 --- a/arch/powerpc/kernel/vdso32/gettimeofday.S +++ b/arch/powerpc/kernel/vdso32/gettimeofday.S @@ -9,6 +9,7 @@ #include <asm/processor.h> #include <asm/ppc_asm.h> #include <asm/vdso.h> +#include <asm/vdso_datapage.h> #include <asm/asm-offsets.h> #include <asm/unistd.h> @@ -31,28 +32,26 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday) mflr r12 .cfi_register lr,r12 - mr r10,r3 /* r10 saves tv */ + mr. r10,r3 /* r10 saves tv */ mr r11,r4 /* r11 saves tz */ - bl __get_datapage@local /* get data page */ - mr r9, r3 /* datapage ptr in r9 */ - cmplwi r10,0 /* check if tv is NULL */ + get_datapage r9, r0 beq 3f - lis r7,1000000@ha /* load up USEC_PER_SEC */ - addi r7,r7,1000000@l /* so we get microseconds in r4 */ + LOAD_REG_IMMEDIATE(r7, 1000000) /* load up USEC_PER_SEC */ bl __do_get_tspec@local /* get sec/usec from tb & kernel */ stw r3,TVAL32_TV_SEC(r10) stw r4,TVAL32_TV_USEC(r10) 3: cmplwi r11,0 /* check if tz is NULL */ - beq 1f + mtlr r12 + crclr cr0*4+so + li r3,0 + beqlr + lwz r4,CFG_TZ_MINUTEWEST(r9)/* fill tz */ lwz r5,CFG_TZ_DSTTIME(r9) stw r4,TZONE_TZ_MINWEST(r11) stw r5,TZONE_TZ_DSTTIME(r11) -1: mtlr r12 - crclr cr0*4+so - li r3,0 blr .cfi_endproc V_FUNCTION_END(__kernel_gettimeofday) @@ -69,17 +68,23 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime) cmpli cr0,r3,CLOCK_REALTIME cmpli cr1,r3,CLOCK_MONOTONIC cror cr0*4+eq,cr0*4+eq,cr1*4+eq - bne cr0,99f + + cmpli cr5,r3,CLOCK_REALTIME_COARSE + cmpli cr6,r3,CLOCK_MONOTONIC_COARSE + cror cr5*4+eq,cr5*4+eq,cr6*4+eq + + cror cr0*4+eq,cr0*4+eq,cr5*4+eq + bne cr0, .Lgettime_fallback mflr r12 /* r12 saves lr */ .cfi_register lr,r12 mr r11,r4 /* r11 saves tp */ - bl __get_datapage@local /* get data page */ - mr r9,r3 /* datapage ptr in r9 */ - lis r7,NSEC_PER_SEC@h /* want nanoseconds */ - ori r7,r7,NSEC_PER_SEC@l -50: bl __do_get_tspec@local /* get sec/nsec from tb & kernel */ - bne cr1,80f /* not monotonic -> all done */ + get_datapage r9, r0 + LOAD_REG_IMMEDIATE(r7, NSEC_PER_SEC) /* load up NSEC_PER_SEC */ + beq cr5, .Lcoarse_clocks +.Lprecise_clocks: + bl __do_get_tspec@local /* get sec/nsec from tb & kernel */ + bne cr1, .Lfinish /* not monotonic -> all done */ /* * CLOCK_MONOTONIC @@ -103,12 +108,53 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime) add r9,r9,r0 lwz r0,(CFG_TB_UPDATE_COUNT+LOPART)(r9) cmpl cr0,r8,r0 /* check if updated */ - bne- 50b + bne- .Lprecise_clocks + b .Lfinish_monotonic + + /* + * For coarse clocks we get data directly from the vdso data page, so + * we don't need to call __do_get_tspec, but we still need to do the + * counter trick. + */ +.Lcoarse_clocks: + lwz r8,(CFG_TB_UPDATE_COUNT+LOPART)(r9) + andi. r0,r8,1 /* pending update ? loop */ + bne- .Lcoarse_clocks + add r9,r9,r0 /* r0 is already 0 */ + + /* + * CLOCK_REALTIME_COARSE, below values are needed for MONOTONIC_COARSE + * too + */ + lwz r3,STAMP_XTIME_SEC+LOPART(r9) + lwz r4,STAMP_XTIME_NSEC+LOPART(r9) + bne cr6,1f + + /* CLOCK_MONOTONIC_COARSE */ + lwz r5,(WTOM_CLOCK_SEC+LOPART)(r9) + lwz r6,WTOM_CLOCK_NSEC(r9) + + /* check if counter has updated */ + or r0,r6,r5 +1: or r0,r0,r3 + or r0,r0,r4 + xor r0,r0,r0 + add r3,r3,r0 + lwz r0,CFG_TB_UPDATE_COUNT+LOPART(r9) + cmpl cr0,r0,r8 /* check if updated */ + bne- .Lcoarse_clocks + + /* Counter has not updated, so continue calculating proper values for + * sec and nsec if monotonic coarse, or just return with the proper + * values for realtime. + */ + bne cr6, .Lfinish /* Calculate and store result. Note that this mimics the C code, * which may cause funny results if nsec goes negative... is that * possible at all ? */ +.Lfinish_monotonic: add r3,r3,r5 add r4,r4,r6 cmpw cr0,r4,r7 @@ -116,11 +162,12 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime) blt 1f subf r4,r7,r4 addi r3,r3,1 -1: bge cr1,80f +1: bge cr1, .Lfinish addi r3,r3,-1 add r4,r4,r7 -80: stw r3,TSPC32_TV_SEC(r11) +.Lfinish: + stw r3,TSPC32_TV_SEC(r11) stw r4,TSPC32_TV_NSEC(r11) mtlr r12 @@ -131,7 +178,7 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime) /* * syscall fallback */ -99: +.Lgettime_fallback: li r0,__NR_clock_gettime .cfi_restore lr sc @@ -149,17 +196,20 @@ V_FUNCTION_END(__kernel_clock_gettime) V_FUNCTION_BEGIN(__kernel_clock_getres) .cfi_startproc /* Check for supported clock IDs */ - cmpwi cr0,r3,CLOCK_REALTIME - cmpwi cr1,r3,CLOCK_MONOTONIC - cror cr0*4+eq,cr0*4+eq,cr1*4+eq - bne cr0,99f + cmplwi cr0, r3, CLOCK_MAX + cmpwi cr1, r3, CLOCK_REALTIME_COARSE + cmpwi cr7, r3, CLOCK_MONOTONIC_COARSE + bgt cr0, 99f + LOAD_REG_IMMEDIATE(r5, KTIME_LOW_RES) + beq cr1, 1f + beq cr7, 1f mflr r12 .cfi_register lr,r12 - bl __get_datapage@local /* get data page */ + get_datapage r3, r0 lwz r5, CLOCK_HRTIMER_RES(r3) mtlr r12 - li r3,0 +1: li r3,0 cmpli cr0,r4,0 crclr cr0*4+so beqlr @@ -168,11 +218,11 @@ V_FUNCTION_BEGIN(__kernel_clock_getres) blr /* - * syscall fallback + * invalid clock */ 99: - li r0,__NR_clock_getres - sc + li r3, EINVAL + crset so blr .cfi_endproc V_FUNCTION_END(__kernel_clock_getres) @@ -190,16 +240,15 @@ V_FUNCTION_BEGIN(__kernel_time) .cfi_register lr,r12 mr r11,r3 /* r11 holds t */ - bl __get_datapage@local - mr r9, r3 /* datapage ptr in r9 */ + get_datapage r9, r0 lwz r3,STAMP_XTIME_SEC+LOPART(r9) cmplwi r11,0 /* check if t is NULL */ - beq 2f - stw r3,0(r11) /* store result at *t */ -2: mtlr r12 + mtlr r12 crclr cr0*4+so + beqlr + stw r3,0(r11) /* store result at *t */ blr .cfi_endproc V_FUNCTION_END(__kernel_time) |