Dear all:
If I search the right place in mip kernel, I find the kernel implement
udelay by multu and bnez looping, in 32-bits mode.
if (sizeof(long) == 4)
__asm__("multu\t%2, %3"
: "=h" (usecs), "=l" (lo)
: "r" (usecs), "r" (lpj)
: GCC_REG_ACCUM);
else if (sizeof(long) == 8)
__asm__("dmultu\t%2, %3"
: "=h" (usecs), "=l" (lo)
: "r" (usecs), "r" (lpj)
: GCC_REG_ACCUM);
__delay(usecs);
why we doing so instead of using kernel timer function and the
precision will be incorrect if the cpu runs faster or slower, right?
appreciate your help,
miloody
