diff options
Diffstat (limited to 'arch/powerpc/kernel/vdso32/gettimeofday.S')
| -rw-r--r-- | arch/powerpc/kernel/vdso32/gettimeofday.S | 291 |
1 files changed, 5 insertions, 286 deletions
diff --git a/arch/powerpc/kernel/vdso32/gettimeofday.S b/arch/powerpc/kernel/vdso32/gettimeofday.S index e7f8f9f1b3f4..fd7b01c51281 100644 --- a/arch/powerpc/kernel/vdso32/gettimeofday.S +++ b/arch/powerpc/kernel/vdso32/gettimeofday.S @@ -12,13 +12,7 @@ #include <asm/vdso_datapage.h> #include <asm/asm-offsets.h> #include <asm/unistd.h> - -/* Offset for the low 32-bit part of a field of long type */ -#ifdef CONFIG_PPC64 -#define LOPART 4 -#else -#define LOPART 0 -#endif +#include <asm/vdso/gettimeofday.h> .text /* @@ -28,32 +22,7 @@ * */ V_FUNCTION_BEGIN(__kernel_gettimeofday) - .cfi_startproc - mflr r12 - .cfi_register lr,r12 - - mr. r10,r3 /* r10 saves tv */ - mr r11,r4 /* r11 saves tz */ - get_datapage r9, r0 - beq 3f - 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 */ - 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) - - blr - .cfi_endproc + cvdso_call __c_kernel_gettimeofday V_FUNCTION_END(__kernel_gettimeofday) /* @@ -63,127 +32,7 @@ V_FUNCTION_END(__kernel_gettimeofday) * */ V_FUNCTION_BEGIN(__kernel_clock_gettime) - .cfi_startproc - /* Check for supported clock IDs */ - cmpli cr0,r3,CLOCK_REALTIME - cmpli cr1,r3,CLOCK_MONOTONIC - cror cr0*4+eq,cr0*4+eq,cr1*4+eq - - 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 */ - 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 - */ - - /* now we must fixup using wall to monotonic. We need to snapshot - * that value and do the counter trick again. Fortunately, we still - * have the counter value in r8 that was returned by __do_get_xsec. - * At this point, r3,r4 contain our sec/nsec values, r5 and r6 - * can be used, r7 contains NSEC_PER_SEC. - */ - - lwz r5,(WTOM_CLOCK_SEC+LOPART)(r9) - lwz r6,WTOM_CLOCK_NSEC(r9) - - /* We now have our offset in r5,r6. We create a fake dependency - * on that value and re-check the counter - */ - or r0,r6,r5 - xor r0,r0,r0 - add r9,r9,r0 - lwz r0,(CFG_TB_UPDATE_COUNT+LOPART)(r9) - cmpl cr0,r8,r0 /* check if updated */ - 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 - cmpwi cr1,r4,0 - blt 1f - subf r4,r7,r4 - addi r3,r3,1 -1: bge cr1, .Lfinish - addi r3,r3,-1 - add r4,r4,r7 - -.Lfinish: - stw r3,TSPC32_TV_SEC(r11) - stw r4,TSPC32_TV_NSEC(r11) - - mtlr r12 - crclr cr0*4+so - li r3,0 - blr - - /* - * syscall fallback - */ -.Lgettime_fallback: - li r0,__NR_clock_gettime - .cfi_restore lr - sc - blr - .cfi_endproc + cvdso_call __c_kernel_clock_gettime V_FUNCTION_END(__kernel_clock_gettime) @@ -194,37 +43,7 @@ V_FUNCTION_END(__kernel_clock_gettime) * */ V_FUNCTION_BEGIN(__kernel_clock_getres) - .cfi_startproc - /* Check for supported clock IDs */ - 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 - get_datapage r3, r0 - lwz r5, CLOCK_HRTIMER_RES(r3) - mtlr r12 -1: li r3,0 - cmpli cr0,r4,0 - crclr cr0*4+so - beqlr - stw r3,TSPC32_TV_SEC(r4) - stw r5,TSPC32_TV_NSEC(r4) - blr - - /* - * syscall fallback - */ -99: - li r0,__NR_clock_getres - sc - blr - .cfi_endproc + cvdso_call __c_kernel_clock_getres V_FUNCTION_END(__kernel_clock_getres) @@ -235,105 +54,5 @@ V_FUNCTION_END(__kernel_clock_getres) * */ V_FUNCTION_BEGIN(__kernel_time) - .cfi_startproc - mflr r12 - .cfi_register lr,r12 - - mr r11,r3 /* r11 holds t */ - get_datapage r9, r0 - - lwz r3,STAMP_XTIME_SEC+LOPART(r9) - - cmplwi r11,0 /* check if t is NULL */ - mtlr r12 - crclr cr0*4+so - beqlr - stw r3,0(r11) /* store result at *t */ - blr - .cfi_endproc + cvdso_call_time __c_kernel_time V_FUNCTION_END(__kernel_time) - -/* - * This is the core of clock_gettime() and gettimeofday(), - * it returns the current time in r3 (seconds) and r4. - * On entry, r7 gives the resolution of r4, either USEC_PER_SEC - * or NSEC_PER_SEC, giving r4 in microseconds or nanoseconds. - * It expects the datapage ptr in r9 and doesn't clobber it. - * It clobbers r0, r5 and r6. - * On return, r8 contains the counter value that can be reused. - * This clobbers cr0 but not any other cr field. - */ -__do_get_tspec: - .cfi_startproc - /* Check for update count & load values. We use the low - * order 32 bits of the update count - */ -1: lwz r8,(CFG_TB_UPDATE_COUNT+LOPART)(r9) - andi. r0,r8,1 /* pending update ? loop */ - bne- 1b - xor r0,r8,r8 /* create dependency */ - add r9,r9,r0 - - /* Load orig stamp (offset to TB) */ - lwz r5,CFG_TB_ORIG_STAMP(r9) - lwz r6,(CFG_TB_ORIG_STAMP+4)(r9) - - /* Get a stable TB value */ -2: MFTBU(r3) - MFTBL(r4) - MFTBU(r0) - cmplw cr0,r3,r0 - bne- 2b - - /* Subtract tb orig stamp and shift left 12 bits. - */ - subfc r4,r6,r4 - subfe r0,r5,r3 - slwi r0,r0,12 - rlwimi. r0,r4,12,20,31 - slwi r4,r4,12 - - /* - * Load scale factor & do multiplication. - * We only use the high 32 bits of the tb_to_xs value. - * Even with a 1GHz timebase clock, the high 32 bits of - * tb_to_xs will be at least 4 million, so the error from - * ignoring the low 32 bits will be no more than 0.25ppm. - * The error will just make the clock run very very slightly - * slow until the next time the kernel updates the VDSO data, - * at which point the clock will catch up to the kernel's value, - * so there is no long-term error accumulation. - */ - lwz r5,CFG_TB_TO_XS(r9) /* load values */ - mulhwu r4,r4,r5 - li r3,0 - - beq+ 4f /* skip high part computation if 0 */ - mulhwu r3,r0,r5 - mullw r5,r0,r5 - addc r4,r4,r5 - addze r3,r3 -4: - /* At this point, we have seconds since the xtime stamp - * as a 32.32 fixed-point number in r3 and r4. - * Load & add the xtime stamp. - */ - lwz r5,STAMP_XTIME_SEC+LOPART(r9) - lwz r6,STAMP_SEC_FRAC(r9) - addc r4,r4,r6 - adde r3,r3,r5 - - /* We create a fake dependency on the result in r3/r4 - * and re-check the counter - */ - or r6,r4,r3 - xor r0,r6,r6 - add r9,r9,r0 - lwz r0,(CFG_TB_UPDATE_COUNT+LOPART)(r9) - cmplw cr0,r8,r0 /* check if updated */ - bne- 1b - - mulhwu r4,r4,r7 /* convert to micro or nanoseconds */ - - blr - .cfi_endproc |