/* * include/asm-xtensa/bitops.h * * Atomic operations that C can't guarantee us.Useful for resource counting etc. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2001 - 2007 Tensilica Inc. */ #ifndef _XTENSA_BITOPS_H #define _XTENSA_BITOPS_H #ifdef __KERNEL__ #ifndef _LINUX_BITOPS_H #error only <linux/bitops.h> can be included directly #endif #include <asm/processor.h> #include <asm/byteorder.h> #include <asm/barrier.h> #include <asm-generic/bitops/non-atomic.h> #if XCHAL_HAVE_NSA static inline unsigned long __cntlz (unsigned long x) { int lz; asm ("nsau %0, %1" : "=r" (lz) : "r" (x)); return lz; } /* * ffz: Find first zero in word. Undefined if no zero exists. * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1). */ static inline int ffz(unsigned long x) { return 31 - __cntlz(~x & -~x); } /* * __ffs: Find first bit set in word. Return 0 for bit 0 */ static inline unsigned long __ffs(unsigned long x) { return 31 - __cntlz(x & -x); } /* * ffs: Find first bit set in word. 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 int ffs(unsigned long x) { return 32 - __cntlz(x & -x); } /* * fls: Find last (most-significant) bit set in word. * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. */ static inline int fls (unsigned int x) { return 32 - __cntlz(x); } /** * __fls - find last (most-significant) set bit in a long word * @word: the word to search * * Undefined if no set bit exists, so code should check against 0 first. */ static inline unsigned long __fls(unsigned long word) { return 31 - __cntlz(word); } #else /* Use the generic implementation if we don't have the nsa/nsau instructions. */ # include <asm-generic/bitops/ffs.h> # include <asm-generic/bitops/__ffs.h> # include <asm-generic/bitops/ffz.h> # include <asm-generic/bitops/fls.h> # include <asm-generic/bitops/__fls.h> #endif #include <asm-generic/bitops/fls64.h> #if XCHAL_HAVE_S32C1I static inline void set_bit(unsigned int bit, volatile unsigned long *p) { unsigned long tmp, value; unsigned long mask = 1UL << (bit & 31); p += bit >> 5; __asm__ __volatile__( "1: l32i %1, %3, 0\n" " wsr %1, scompare1\n" " or %0, %1, %2\n" " s32c1i %0, %3, 0\n" " bne %0, %1, 1b\n" : "=&a" (tmp), "=&a" (value) : "a" (mask), "a" (p) : "memory"); } static inline void clear_bit(unsigned int bit, volatile unsigned long *p) { unsigned long tmp, value; unsigned long mask = 1UL << (bit & 31); p += bit >> 5; __asm__ __volatile__( "1: l32i %1, %3, 0\n" " wsr %1, scompare1\n" " and %0, %1, %2\n" " s32c1i %0, %3, 0\n" " bne %0, %1, 1b\n" : "=&a" (tmp), "=&a" (value) : "a" (~mask), "a" (p) : "memory"); } static inline void change_bit(unsigned int bit, volatile unsigned long *p) { unsigned long tmp, value; unsigned long mask = 1UL << (bit & 31); p += bit >> 5; __asm__ __volatile__( "1: l32i %1, %3, 0\n" " wsr %1, scompare1\n" " xor %0, %1, %2\n" " s32c1i %0, %3, 0\n" " bne %0, %1, 1b\n" : "=&a" (tmp), "=&a" (value) : "a" (mask), "a" (p) : "memory"); } static inline int test_and_set_bit(unsigned int bit, volatile unsigned long *p) { unsigned long tmp, value; unsigned long mask = 1UL << (bit & 31); p += bit >> 5; __asm__ __volatile__( "1: l32i %1, %3, 0\n" " wsr %1, scompare1\n" " or %0, %1, %2\n" " s32c1i %0, %3, 0\n" " bne %0, %1, 1b\n" : "=&a" (tmp), "=&a" (value) : "a" (mask), "a" (p) : "memory"); return tmp & mask; } static inline int test_and_clear_bit(unsigned int bit, volatile unsigned long *p) { unsigned long tmp, value; unsigned long mask = 1UL << (bit & 31); p += bit >> 5; __asm__ __volatile__( "1: l32i %1, %3, 0\n" " wsr %1, scompare1\n" " and %0, %1, %2\n" " s32c1i %0, %3, 0\n" " bne %0, %1, 1b\n" : "=&a" (tmp), "=&a" (value) : "a" (~mask), "a" (p) : "memory"); return tmp & mask; } static inline int test_and_change_bit(unsigned int bit, volatile unsigned long *p) { unsigned long tmp, value; unsigned long mask = 1UL << (bit & 31); p += bit >> 5; __asm__ __volatile__( "1: l32i %1, %3, 0\n" " wsr %1, scompare1\n" " xor %0, %1, %2\n" " s32c1i %0, %3, 0\n" " bne %0, %1, 1b\n" : "=&a" (tmp), "=&a" (value) : "a" (mask), "a" (p) : "memory"); return tmp & mask; } #else #include <asm-generic/bitops/atomic.h> #endif /* XCHAL_HAVE_S32C1I */ #include <asm-generic/bitops/find.h> #include <asm-generic/bitops/le.h> #include <asm-generic/bitops/ext2-atomic-setbit.h> #include <asm-generic/bitops/hweight.h> #include <asm-generic/bitops/lock.h> #include <asm-generic/bitops/sched.h> #endif /* __KERNEL__ */ #endif /* _XTENSA_BITOPS_H */
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Kbuild | File | 685 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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asm-uaccess.h | File | 4.11 KB | 0644 |
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asmmacro.h | File | 2.76 KB | 0644 |
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atomic.h | File | 7.38 KB | 0644 |
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barrier.h | File | 542 B | 0644 |
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bitops.h | File | 5.08 KB | 0644 |
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bootparam.h | File | 1.37 KB | 0644 |
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bugs.h | File | 451 B | 0644 |
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cache.h | File | 969 B | 0644 |
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cacheasm.h | File | 3.77 KB | 0644 |
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cacheflush.h | File | 5.76 KB | 0644 |
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checksum.h | File | 6 KB | 0644 |
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cmpxchg.h | File | 3.9 KB | 0644 |
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coprocessor.h | File | 5.05 KB | 0644 |
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current.h | File | 675 B | 0644 |
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delay.h | File | 1.63 KB | 0644 |
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dma-mapping.h | File | 855 B | 0644 |
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dma.h | File | 1.79 KB | 0644 |
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elf.h | File | 5.75 KB | 0644 |
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fixmap.h | File | 2.5 KB | 0644 |
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flat.h | File | 686 B | 0644 |
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ftrace.h | File | 979 B | 0644 |
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futex.h | File | 2.59 KB | 0644 |
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highmem.h | File | 2.33 KB | 0644 |
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hw_breakpoint.h | File | 1.45 KB | 0644 |
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hw_irq.h | File | 320 B | 0644 |
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initialize_mmu.h | File | 4.58 KB | 0644 |
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io.h | File | 2.09 KB | 0644 |
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irq.h | File | 1.46 KB | 0644 |
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irqflags.h | File | 1.99 KB | 0644 |
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kmem_layout.h | File | 2.07 KB | 0644 |
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mmu.h | File | 462 B | 0644 |
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mmu_context.h | File | 3.62 KB | 0644 |
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module.h | File | 525 B | 0644 |
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mxregs.h | File | 1.3 KB | 0644 |
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nommu_context.h | File | 602 B | 0644 |
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page.h | File | 5.69 KB | 0644 |
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pci-bridge.h | File | 2.16 KB | 0644 |
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pci.h | File | 1.37 KB | 0644 |
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perf_event.h | File | 108 B | 0644 |
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pgalloc.h | File | 1.84 KB | 0644 |
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pgtable.h | File | 14.89 KB | 0644 |
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platform.h | File | 1.75 KB | 0644 |
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processor.h | File | 7.44 KB | 0644 |
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ptrace.h | File | 3.74 KB | 0644 |
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regs.h | File | 3.87 KB | 0644 |
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segment.h | File | 376 B | 0644 |
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serial.h | File | 443 B | 0644 |
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shmparam.h | File | 561 B | 0644 |
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signal.h | File | 502 B | 0644 |
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smp.h | File | 967 B | 0644 |
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spinlock.h | File | 4.6 KB | 0644 |
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spinlock_types.h | File | 412 B | 0644 |
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stacktrace.h | File | 1.13 KB | 0644 |
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string.h | File | 2.65 KB | 0644 |
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switch_to.h | File | 601 B | 0644 |
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syscall.h | File | 982 B | 0644 |
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sysmem.h | File | 426 B | 0644 |
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thread_info.h | File | 3.62 KB | 0644 |
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timex.h | File | 1.79 KB | 0644 |
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tlb.h | File | 1.1 KB | 0644 |
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tlbflush.h | File | 5.53 KB | 0644 |
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traps.h | File | 1.87 KB | 0644 |
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types.h | File | 501 B | 0644 |
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uaccess.h | File | 8.67 KB | 0644 |
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ucontext.h | File | 540 B | 0644 |
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unaligned.h | File | 864 B | 0644 |
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unistd.h | File | 639 B | 0644 |
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user.h | File | 507 B | 0644 |
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vectors.h | File | 4.05 KB | 0644 |
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vga.h | File | 434 B | 0644 |
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