/* SPDX-License-Identifier: GPL-2.0 */ /* asm/arch/bitops.h for Linux/CRISv10 */ #ifndef _CRIS_ARCH_BITOPS_H #define _CRIS_ARCH_BITOPS_H /* * Helper functions for the core of the ff[sz] functions, wrapping the * syntactically awkward asms. The asms compute the number of leading * zeroes of a bits-in-byte and byte-in-word and word-in-dword-swapped * number. They differ in that the first function also inverts all bits * in the input. */ static inline unsigned long cris_swapnwbrlz(unsigned long w) { /* Let's just say we return the result in the same register as the input. Saying we clobber the input but can return the result in another register: ! __asm__ ("swapnwbr %2\n\tlz %2,%0" ! : "=r,r" (res), "=r,X" (dummy) : "1,0" (w)); confuses gcc (core.c, gcc from cris-dist-1.14). */ unsigned long res; __asm__ ("swapnwbr %0 \n\t" "lz %0,%0" : "=r" (res) : "0" (w)); return res; } static inline unsigned long cris_swapwbrlz(unsigned long w) { unsigned res; __asm__ ("swapwbr %0 \n\t" "lz %0,%0" : "=r" (res) : "0" (w)); return res; } /* * ffz = Find First Zero in word. Undefined if no zero exists, * so code should check against ~0UL first.. */ static inline unsigned long ffz(unsigned long w) { return cris_swapnwbrlz(w); } /** * __ffs - find first bit in word. * @word: The word to search * * Undefined if no bit exists, so code should check against 0 first. */ static inline unsigned long __ffs(unsigned long word) { return cris_swapnwbrlz(~word); } /** * ffs - find first bit set * @x: the word to search * * This is defined the same way as * the libc and compiler builtin ffs routines, therefore * differs in spirit from the above ffz (man ffs). */ static inline unsigned long kernel_ffs(unsigned long w) { return w ? cris_swapwbrlz (w) + 1 : 0; } #endif
Name | Type | Size | Permission | Actions |
---|---|---|---|---|
bitops.h | File | 1.81 KB | 0644 |
|
bug.h | File | 2.07 KB | 0644 |
|
cache.h | File | 219 B | 0644 |
|
checksum.h | File | 726 B | 0644 |
|
delay.h | File | 394 B | 0644 |
|
dma.h | File | 1.74 KB | 0644 |
|
io.h | File | 6.46 KB | 0644 |
|
io_interface_mux.h | File | 2.02 KB | 0644 |
|
irq.h | File | 5.95 KB | 0644 |
|
irqflags.h | File | 994 B | 0644 |
|
memmap.h | File | 680 B | 0644 |
|
mmu.h | File | 3.4 KB | 0644 |
|
offset.h | File | 1.19 KB | 0644 |
|
page.h | File | 920 B | 0644 |
|
pgtable.h | File | 324 B | 0644 |
|
processor.h | File | 2 KB | 0644 |
|
swab.h | File | 672 B | 0644 |
|
system.h | File | 809 B | 0644 |
|
thread_info.h | File | 335 B | 0644 |
|
timex.h | File | 982 B | 0644 |
|
tlb.h | File | 394 B | 0644 |
|
uaccess.h | File | 17.7 KB | 0644 |
|
unistd.h | File | 4.38 KB | 0644 |
|