XSDFEC_REG_WIDTH_JUMP
if (offset > depth / XSDFEC_REG_WIDTH_JUMP ||
len > depth / XSDFEC_REG_WIDTH_JUMP ||
offset + len > depth / XSDFEC_REG_WIDTH_JUMP) {
n = (len * XSDFEC_REG_WIDTH_JUMP) / PAGE_SIZE;
if ((len * XSDFEC_REG_WIDTH_JUMP) % PAGE_SIZE)
XSDFEC_REG_WIDTH_JUMP),
((reg * XSDFEC_REG_WIDTH_JUMP) % PAGE_SIZE));