1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
476 lines
10 KiB
C
476 lines
10 KiB
C
#ifndef __ASM_SH_BITOPS_H
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#define __ASM_SH_BITOPS_H
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#ifdef __KERNEL__
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#include <asm/system.h>
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/* For __swab32 */
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#include <asm/byteorder.h>
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static __inline__ void set_bit(int nr, volatile void * addr)
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{
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int mask;
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volatile unsigned int *a = addr;
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unsigned long flags;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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local_irq_save(flags);
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*a |= mask;
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local_irq_restore(flags);
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}
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static __inline__ void __set_bit(int nr, volatile void * addr)
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{
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int mask;
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volatile unsigned int *a = addr;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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*a |= mask;
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}
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/*
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* clear_bit() doesn't provide any barrier for the compiler.
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*/
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#define smp_mb__before_clear_bit() barrier()
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#define smp_mb__after_clear_bit() barrier()
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static __inline__ void clear_bit(int nr, volatile void * addr)
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{
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int mask;
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volatile unsigned int *a = addr;
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unsigned long flags;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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local_irq_save(flags);
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*a &= ~mask;
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local_irq_restore(flags);
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}
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static __inline__ void __clear_bit(int nr, volatile void * addr)
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{
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int mask;
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volatile unsigned int *a = addr;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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*a &= ~mask;
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}
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static __inline__ void change_bit(int nr, volatile void * addr)
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{
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int mask;
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volatile unsigned int *a = addr;
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unsigned long flags;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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local_irq_save(flags);
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*a ^= mask;
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local_irq_restore(flags);
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}
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static __inline__ void __change_bit(int nr, volatile void * addr)
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{
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int mask;
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volatile unsigned int *a = addr;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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*a ^= mask;
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}
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static __inline__ int test_and_set_bit(int nr, volatile void * addr)
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{
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int mask, retval;
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volatile unsigned int *a = addr;
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unsigned long flags;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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local_irq_save(flags);
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retval = (mask & *a) != 0;
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*a |= mask;
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local_irq_restore(flags);
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return retval;
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}
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static __inline__ int __test_and_set_bit(int nr, volatile void * addr)
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{
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int mask, retval;
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volatile unsigned int *a = addr;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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retval = (mask & *a) != 0;
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*a |= mask;
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return retval;
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}
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static __inline__ int test_and_clear_bit(int nr, volatile void * addr)
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{
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int mask, retval;
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volatile unsigned int *a = addr;
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unsigned long flags;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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local_irq_save(flags);
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retval = (mask & *a) != 0;
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*a &= ~mask;
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local_irq_restore(flags);
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return retval;
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}
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static __inline__ int __test_and_clear_bit(int nr, volatile void * addr)
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{
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int mask, retval;
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volatile unsigned int *a = addr;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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retval = (mask & *a) != 0;
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*a &= ~mask;
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return retval;
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}
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static __inline__ int test_and_change_bit(int nr, volatile void * addr)
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{
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int mask, retval;
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volatile unsigned int *a = addr;
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unsigned long flags;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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local_irq_save(flags);
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retval = (mask & *a) != 0;
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*a ^= mask;
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local_irq_restore(flags);
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return retval;
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}
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static __inline__ int __test_and_change_bit(int nr, volatile void * addr)
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{
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int mask, retval;
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volatile unsigned int *a = addr;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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retval = (mask & *a) != 0;
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*a ^= mask;
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return retval;
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}
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static __inline__ int test_bit(int nr, const volatile void *addr)
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{
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return 1UL & (((const volatile unsigned int *) addr)[nr >> 5] >> (nr & 31));
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}
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static __inline__ unsigned long ffz(unsigned long word)
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{
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unsigned long result;
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__asm__("1:\n\t"
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"shlr %1\n\t"
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"bt/s 1b\n\t"
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" add #1, %0"
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: "=r" (result), "=r" (word)
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: "0" (~0L), "1" (word)
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: "t");
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return result;
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}
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/**
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* __ffs - find first bit in word.
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* @word: The word to search
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*
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* Undefined if no bit exists, so code should check against 0 first.
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*/
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static __inline__ unsigned long __ffs(unsigned long word)
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{
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unsigned long result;
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__asm__("1:\n\t"
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"shlr %1\n\t"
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"bf/s 1b\n\t"
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" add #1, %0"
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: "=r" (result), "=r" (word)
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: "0" (~0L), "1" (word)
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: "t");
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return result;
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}
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/**
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* find_next_bit - find the next set bit in a memory region
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* @addr: The address to base the search on
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* @offset: The bitnumber to start searching at
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* @size: The maximum size to search
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*/
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static __inline__ unsigned long find_next_bit(const unsigned long *addr,
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unsigned long size, unsigned long offset)
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{
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unsigned int *p = ((unsigned int *) addr) + (offset >> 5);
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unsigned int result = offset & ~31UL;
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unsigned int tmp;
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if (offset >= size)
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return size;
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size -= result;
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offset &= 31UL;
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if (offset) {
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tmp = *p++;
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tmp &= ~0UL << offset;
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if (size < 32)
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goto found_first;
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if (tmp)
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goto found_middle;
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size -= 32;
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result += 32;
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}
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while (size >= 32) {
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if ((tmp = *p++) != 0)
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goto found_middle;
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result += 32;
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size -= 32;
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}
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if (!size)
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return result;
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tmp = *p;
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found_first:
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tmp &= ~0UL >> (32 - size);
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if (tmp == 0UL) /* Are any bits set? */
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return result + size; /* Nope. */
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found_middle:
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return result + __ffs(tmp);
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}
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/**
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* find_first_bit - find the first set bit in a memory region
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* @addr: The address to start the search at
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* @size: The maximum size to search
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*
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* Returns the bit-number of the first set bit, not the number of the byte
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* containing a bit.
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*/
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#define find_first_bit(addr, size) \
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find_next_bit((addr), (size), 0)
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static __inline__ int find_next_zero_bit(const unsigned long *addr, int size, int offset)
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{
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const unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
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unsigned long result = offset & ~31UL;
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unsigned long tmp;
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if (offset >= size)
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return size;
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size -= result;
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offset &= 31UL;
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if (offset) {
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tmp = *(p++);
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tmp |= ~0UL >> (32-offset);
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if (size < 32)
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goto found_first;
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if (~tmp)
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goto found_middle;
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size -= 32;
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result += 32;
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}
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while (size & ~31UL) {
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if (~(tmp = *(p++)))
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goto found_middle;
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result += 32;
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size -= 32;
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}
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if (!size)
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return result;
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tmp = *p;
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found_first:
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tmp |= ~0UL << size;
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found_middle:
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return result + ffz(tmp);
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}
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#define find_first_zero_bit(addr, size) \
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find_next_zero_bit((addr), (size), 0)
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/*
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* ffs: find first bit set. This is defined the same way as
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* the libc and compiler builtin ffs routines, therefore
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* differs in spirit from the above ffz (man ffs).
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*/
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#define ffs(x) generic_ffs(x)
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/*
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* hweightN: returns the hamming weight (i.e. the number
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* of bits set) of a N-bit word
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*/
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#define hweight32(x) generic_hweight32(x)
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#define hweight16(x) generic_hweight16(x)
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#define hweight8(x) generic_hweight8(x)
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/*
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* Every architecture must define this function. It's the fastest
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* way of searching a 140-bit bitmap where the first 100 bits are
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* unlikely to be set. It's guaranteed that at least one of the 140
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* bits is cleared.
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*/
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static inline int sched_find_first_bit(const unsigned long *b)
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{
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if (unlikely(b[0]))
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return __ffs(b[0]);
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if (unlikely(b[1]))
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return __ffs(b[1]) + 32;
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if (unlikely(b[2]))
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return __ffs(b[2]) + 64;
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if (b[3])
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return __ffs(b[3]) + 96;
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return __ffs(b[4]) + 128;
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}
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#ifdef __LITTLE_ENDIAN__
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#define ext2_set_bit(nr, addr) test_and_set_bit((nr), (addr))
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#define ext2_clear_bit(nr, addr) test_and_clear_bit((nr), (addr))
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#define ext2_test_bit(nr, addr) test_bit((nr), (addr))
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#define ext2_find_first_zero_bit(addr, size) find_first_zero_bit((addr), (size))
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#define ext2_find_next_zero_bit(addr, size, offset) \
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find_next_zero_bit((unsigned long *)(addr), (size), (offset))
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#else
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static __inline__ int ext2_set_bit(int nr, volatile void * addr)
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{
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int mask, retval;
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unsigned long flags;
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volatile unsigned char *ADDR = (unsigned char *) addr;
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ADDR += nr >> 3;
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mask = 1 << (nr & 0x07);
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local_irq_save(flags);
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retval = (mask & *ADDR) != 0;
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*ADDR |= mask;
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local_irq_restore(flags);
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return retval;
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}
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static __inline__ int ext2_clear_bit(int nr, volatile void * addr)
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{
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int mask, retval;
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unsigned long flags;
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volatile unsigned char *ADDR = (unsigned char *) addr;
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ADDR += nr >> 3;
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mask = 1 << (nr & 0x07);
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local_irq_save(flags);
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retval = (mask & *ADDR) != 0;
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*ADDR &= ~mask;
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local_irq_restore(flags);
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return retval;
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}
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static __inline__ int ext2_test_bit(int nr, const volatile void * addr)
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{
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int mask;
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const volatile unsigned char *ADDR = (const unsigned char *) addr;
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ADDR += nr >> 3;
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mask = 1 << (nr & 0x07);
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return ((mask & *ADDR) != 0);
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}
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#define ext2_find_first_zero_bit(addr, size) \
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ext2_find_next_zero_bit((addr), (size), 0)
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static __inline__ unsigned long ext2_find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
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{
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unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
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unsigned long result = offset & ~31UL;
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unsigned long tmp;
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if (offset >= size)
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return size;
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size -= result;
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offset &= 31UL;
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if(offset) {
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/* We hold the little endian value in tmp, but then the
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* shift is illegal. So we could keep a big endian value
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* in tmp, like this:
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*
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* tmp = __swab32(*(p++));
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* tmp |= ~0UL >> (32-offset);
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*
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* but this would decrease preformance, so we change the
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* shift:
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*/
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tmp = *(p++);
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tmp |= __swab32(~0UL >> (32-offset));
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if(size < 32)
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goto found_first;
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if(~tmp)
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goto found_middle;
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size -= 32;
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result += 32;
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}
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while(size & ~31UL) {
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if(~(tmp = *(p++)))
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goto found_middle;
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result += 32;
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size -= 32;
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}
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if(!size)
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return result;
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tmp = *p;
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found_first:
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/* tmp is little endian, so we would have to swab the shift,
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* see above. But then we have to swab tmp below for ffz, so
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* we might as well do this here.
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*/
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return result + ffz(__swab32(tmp) | (~0UL << size));
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found_middle:
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return result + ffz(__swab32(tmp));
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}
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#endif
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#define ext2_set_bit_atomic(lock, nr, addr) \
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({ \
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int ret; \
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spin_lock(lock); \
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ret = ext2_set_bit((nr), (addr)); \
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spin_unlock(lock); \
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ret; \
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})
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#define ext2_clear_bit_atomic(lock, nr, addr) \
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({ \
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int ret; \
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spin_lock(lock); \
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ret = ext2_clear_bit((nr), (addr)); \
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spin_unlock(lock); \
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ret; \
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})
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/* Bitmap functions for the minix filesystem. */
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#define minix_test_and_set_bit(nr,addr) test_and_set_bit(nr,addr)
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#define minix_set_bit(nr,addr) set_bit(nr,addr)
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#define minix_test_and_clear_bit(nr,addr) test_and_clear_bit(nr,addr)
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#define minix_test_bit(nr,addr) test_bit(nr,addr)
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#define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)
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/*
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* fls: find last bit set.
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*/
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#define fls(x) generic_fls(x)
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#endif /* __KERNEL__ */
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#endif /* __ASM_SH_BITOPS_H */
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