On Wed, Sep 19, 2012 at 09:31:35AM -0700, John Stultz wrote: > On powerpc, I mean magic addresses where userland can find > structures that it can use to calculate time.
... > With powerpc, there is no arch specific kernel code involved, its > just a data structure the kernel exports that is accessible to > userland. The execution logic lives in userland libraries, or > sometimes application code itself. I took a brief look at arch/powerpc/kernel/vdso32/gettimeofday.S and arch/powerpc/kernel/vdso64/gettimeofday.S, and I see what looks a lot like functions $ find arch/powerpc/kernel/vdso* -name gettimeofday.S|xargs grep FUNCTION_BEGIN arch/powerpc/kernel/vdso32/gettimeofday.S:V_FUNCTION_BEGIN(__kernel_gettimeofday) arch/powerpc/kernel/vdso32/gettimeofday.S:V_FUNCTION_BEGIN(__kernel_clock_gettime) arch/powerpc/kernel/vdso32/gettimeofday.S:V_FUNCTION_BEGIN(__kernel_clock_getres) arch/powerpc/kernel/vdso64/gettimeofday.S:V_FUNCTION_BEGIN(__kernel_gettimeofday) arch/powerpc/kernel/vdso64/gettimeofday.S:V_FUNCTION_BEGIN(__kernel_clock_gettime) arch/powerpc/kernel/vdso64/gettimeofday.S:V_FUNCTION_BEGIN(__kernel_clock_getres) arch/powerpc/kernel/vdso64/gettimeofday.S:V_FUNCTION_BEGIN(__do_get_tspec) and I wonder whether these could be done in C instead. Thanks, Richard -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
