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-rw-r--r--include/asm-m68knommu/bitops.h503
1 files changed, 503 insertions, 0 deletions
diff --git a/include/asm-m68knommu/bitops.h b/include/asm-m68knommu/bitops.h
new file mode 100644
index 000000000000..f95e32b40425
--- /dev/null
+++ b/include/asm-m68knommu/bitops.h
@@ -0,0 +1,503 @@
+#ifndef _M68KNOMMU_BITOPS_H
+#define _M68KNOMMU_BITOPS_H
+
+/*
+ * Copyright 1992, Linus Torvalds.
+ */
+
+#include <linux/config.h>
+#include <linux/compiler.h>
+#include <asm/byteorder.h> /* swab32 */
+#include <asm/system.h> /* save_flags */
+
+#ifdef __KERNEL__
+
+/*
+ * Generic ffs().
+ */
+static inline int ffs(int x)
+{
+ int r = 1;
+
+ if (!x)
+ return 0;
+ if (!(x & 0xffff)) {
+ x >>= 16;
+ r += 16;
+ }
+ if (!(x & 0xff)) {
+ x >>= 8;
+ r += 8;
+ }
+ if (!(x & 0xf)) {
+ x >>= 4;
+ r += 4;
+ }
+ if (!(x & 3)) {
+ x >>= 2;
+ r += 2;
+ }
+ if (!(x & 1)) {
+ x >>= 1;
+ r += 1;
+ }
+ return r;
+}
+
+/*
+ * Generic __ffs().
+ */
+static inline int __ffs(int x)
+{
+ int r = 0;
+
+ if (!x)
+ return 0;
+ if (!(x & 0xffff)) {
+ x >>= 16;
+ r += 16;
+ }
+ if (!(x & 0xff)) {
+ x >>= 8;
+ r += 8;
+ }
+ if (!(x & 0xf)) {
+ x >>= 4;
+ r += 4;
+ }
+ if (!(x & 3)) {
+ x >>= 2;
+ r += 2;
+ }
+ if (!(x & 1)) {
+ x >>= 1;
+ r += 1;
+ }
+ return r;
+}
+
+/*
+ * Every architecture must define this function. It's the fastest
+ * way of searching a 140-bit bitmap where the first 100 bits are
+ * unlikely to be set. It's guaranteed that at least one of the 140
+ * bits is cleared.
+ */
+static inline int sched_find_first_bit(unsigned long *b)
+{
+ if (unlikely(b[0]))
+ return __ffs(b[0]);
+ if (unlikely(b[1]))
+ return __ffs(b[1]) + 32;
+ if (unlikely(b[2]))
+ return __ffs(b[2]) + 64;
+ if (b[3])
+ return __ffs(b[3]) + 96;
+ return __ffs(b[4]) + 128;
+}
+
+/*
+ * 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 word)
+{
+ unsigned long result = 0;
+
+ while(word & 1) {
+ result++;
+ word >>= 1;
+ }
+ return result;
+}
+
+
+static __inline__ void set_bit(int nr, volatile unsigned long * addr)
+{
+#ifdef CONFIG_COLDFIRE
+ __asm__ __volatile__ ("lea %0,%%a0; bset %1,(%%a0)"
+ : "+m" (((volatile char *)addr)[(nr^31) >> 3])
+ : "d" (nr)
+ : "%a0", "cc");
+#else
+ __asm__ __volatile__ ("bset %1,%0"
+ : "+m" (((volatile char *)addr)[(nr^31) >> 3])
+ : "di" (nr)
+ : "cc");
+#endif
+}
+
+#define __set_bit(nr, addr) set_bit(nr, addr)
+
+/*
+ * clear_bit() doesn't provide any barrier for the compiler.
+ */
+#define smp_mb__before_clear_bit() barrier()
+#define smp_mb__after_clear_bit() barrier()
+
+static __inline__ void clear_bit(int nr, volatile unsigned long * addr)
+{
+#ifdef CONFIG_COLDFIRE
+ __asm__ __volatile__ ("lea %0,%%a0; bclr %1,(%%a0)"
+ : "+m" (((volatile char *)addr)[(nr^31) >> 3])
+ : "d" (nr)
+ : "%a0", "cc");
+#else
+ __asm__ __volatile__ ("bclr %1,%0"
+ : "+m" (((volatile char *)addr)[(nr^31) >> 3])
+ : "di" (nr)
+ : "cc");
+#endif
+}
+
+#define __clear_bit(nr, addr) clear_bit(nr, addr)
+
+static __inline__ void change_bit(int nr, volatile unsigned long * addr)
+{
+#ifdef CONFIG_COLDFIRE
+ __asm__ __volatile__ ("lea %0,%%a0; bchg %1,(%%a0)"
+ : "+m" (((volatile char *)addr)[(nr^31) >> 3])
+ : "d" (nr)
+ : "%a0", "cc");
+#else
+ __asm__ __volatile__ ("bchg %1,%0"
+ : "+m" (((volatile char *)addr)[(nr^31) >> 3])
+ : "di" (nr)
+ : "cc");
+#endif
+}
+
+#define __change_bit(nr, addr) change_bit(nr, addr)
+
+static __inline__ int test_and_set_bit(int nr, volatile unsigned long * addr)
+{
+ char retval;
+
+#ifdef CONFIG_COLDFIRE
+ __asm__ __volatile__ ("lea %1,%%a0; bset %2,(%%a0); sne %0"
+ : "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
+ : "d" (nr)
+ : "%a0");
+#else
+ __asm__ __volatile__ ("bset %2,%1; sne %0"
+ : "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
+ : "di" (nr)
+ /* No clobber */);
+#endif
+
+ return retval;
+}
+
+#define __test_and_set_bit(nr, addr) test_and_set_bit(nr, addr)
+
+static __inline__ int test_and_clear_bit(int nr, volatile unsigned long * addr)
+{
+ char retval;
+
+#ifdef CONFIG_COLDFIRE
+ __asm__ __volatile__ ("lea %1,%%a0; bclr %2,(%%a0); sne %0"
+ : "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
+ : "d" (nr)
+ : "%a0");
+#else
+ __asm__ __volatile__ ("bclr %2,%1; sne %0"
+ : "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
+ : "di" (nr)
+ /* No clobber */);
+#endif
+
+ return retval;
+}
+
+#define __test_and_clear_bit(nr, addr) test_and_clear_bit(nr, addr)
+
+static __inline__ int test_and_change_bit(int nr, volatile unsigned long * addr)
+{
+ char retval;
+
+#ifdef CONFIG_COLDFIRE
+ __asm__ __volatile__ ("lea %1,%%a0\n\tbchg %2,(%%a0)\n\tsne %0"
+ : "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
+ : "d" (nr)
+ : "%a0");
+#else
+ __asm__ __volatile__ ("bchg %2,%1; sne %0"
+ : "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
+ : "di" (nr)
+ /* No clobber */);
+#endif
+
+ return retval;
+}
+
+#define __test_and_change_bit(nr, addr) test_and_change_bit(nr, addr)
+
+/*
+ * This routine doesn't need to be atomic.
+ */
+static __inline__ int __constant_test_bit(int nr, const volatile unsigned long * addr)
+{
+ return ((1UL << (nr & 31)) & (((const volatile unsigned int *) addr)[nr >> 5])) != 0;
+}
+
+static __inline__ int __test_bit(int nr, const volatile unsigned long * addr)
+{
+ int * a = (int *) addr;
+ int mask;
+
+ a += nr >> 5;
+ mask = 1 << (nr & 0x1f);
+ return ((mask & *a) != 0);
+}
+
+#define test_bit(nr,addr) \
+(__builtin_constant_p(nr) ? \
+ __constant_test_bit((nr),(addr)) : \
+ __test_bit((nr),(addr)))
+
+#define find_first_zero_bit(addr, size) \
+ find_next_zero_bit((addr), (size), 0)
+#define find_first_bit(addr, size) \
+ find_next_bit((addr), (size), 0)
+
+static __inline__ int find_next_zero_bit (void * addr, int size, int offset)
+{
+ unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
+ unsigned long result = offset & ~31UL;
+ unsigned long tmp;
+
+ if (offset >= size)
+ return size;
+ size -= result;
+ offset &= 31UL;
+ if (offset) {
+ tmp = *(p++);
+ tmp |= ~0UL >> (32-offset);
+ if (size < 32)
+ goto found_first;
+ if (~tmp)
+ goto found_middle;
+ size -= 32;
+ result += 32;
+ }
+ while (size & ~31UL) {
+ if (~(tmp = *(p++)))
+ goto found_middle;
+ result += 32;
+ size -= 32;
+ }
+ if (!size)
+ return result;
+ tmp = *p;
+
+found_first:
+ tmp |= ~0UL >> size;
+found_middle:
+ return result + ffz(tmp);
+}
+
+/*
+ * Find next one bit in a bitmap reasonably efficiently.
+ */
+static __inline__ unsigned long find_next_bit(const unsigned long *addr,
+ unsigned long size, unsigned long offset)
+{
+ unsigned int *p = ((unsigned int *) addr) + (offset >> 5);
+ unsigned int result = offset & ~31UL;
+ unsigned int tmp;
+
+ if (offset >= size)
+ return size;
+ size -= result;
+ offset &= 31UL;
+ if (offset) {
+ tmp = *p++;
+ tmp &= ~0UL << offset;
+ if (size < 32)
+ goto found_first;
+ if (tmp)
+ goto found_middle;
+ size -= 32;
+ result += 32;
+ }
+ while (size >= 32) {
+ if ((tmp = *p++) != 0)
+ goto found_middle;
+ result += 32;
+ size -= 32;
+ }
+ if (!size)
+ return result;
+ tmp = *p;
+
+found_first:
+ tmp &= ~0UL >> (32 - size);
+ if (tmp == 0UL) /* Are any bits set? */
+ return result + size; /* Nope. */
+found_middle:
+ return result + __ffs(tmp);
+}
+
+/*
+ * hweightN: returns the hamming weight (i.e. the number
+ * of bits set) of a N-bit word
+ */
+
+#define hweight32(x) generic_hweight32(x)
+#define hweight16(x) generic_hweight16(x)
+#define hweight8(x) generic_hweight8(x)
+
+
+static __inline__ int ext2_set_bit(int nr, volatile void * addr)
+{
+ char retval;
+
+#ifdef CONFIG_COLDFIRE
+ __asm__ __volatile__ ("lea %1,%%a0; bset %2,(%%a0); sne %0"
+ : "=d" (retval), "+m" (((volatile char *)addr)[nr >> 3])
+ : "d" (nr)
+ : "%a0");
+#else
+ __asm__ __volatile__ ("bset %2,%1; sne %0"
+ : "=d" (retval), "+m" (((volatile char *)addr)[nr >> 3])
+ : "di" (nr)
+ /* No clobber */);
+#endif
+
+ return retval;
+}
+
+static __inline__ int ext2_clear_bit(int nr, volatile void * addr)
+{
+ char retval;
+
+#ifdef CONFIG_COLDFIRE
+ __asm__ __volatile__ ("lea %1,%%a0; bclr %2,(%%a0); sne %0"
+ : "=d" (retval), "+m" (((volatile char *)addr)[nr >> 3])
+ : "d" (nr)
+ : "%a0");
+#else
+ __asm__ __volatile__ ("bclr %2,%1; sne %0"
+ : "=d" (retval), "+m" (((volatile char *)addr)[nr >> 3])
+ : "di" (nr)
+ /* No clobber */);
+#endif
+
+ return retval;
+}
+
+#define ext2_set_bit_atomic(lock, nr, addr) \
+ ({ \
+ int ret; \
+ spin_lock(lock); \
+ ret = ext2_set_bit((nr), (addr)); \
+ spin_unlock(lock); \
+ ret; \
+ })
+
+#define ext2_clear_bit_atomic(lock, nr, addr) \
+ ({ \
+ int ret; \
+ spin_lock(lock); \
+ ret = ext2_clear_bit((nr), (addr)); \
+ spin_unlock(lock); \
+ ret; \
+ })
+
+static __inline__ int ext2_test_bit(int nr, const volatile void * addr)
+{
+ char retval;
+
+#ifdef CONFIG_COLDFIRE
+ __asm__ __volatile__ ("lea %1,%%a0; btst %2,(%%a0); sne %0"
+ : "=d" (retval)
+ : "m" (((const volatile char *)addr)[nr >> 3]), "d" (nr)
+ : "%a0");
+#else
+ __asm__ __volatile__ ("btst %2,%1; sne %0"
+ : "=d" (retval)
+ : "m" (((const volatile char *)addr)[nr >> 3]), "di" (nr)
+ /* No clobber */);
+#endif
+
+ return retval;
+}
+
+#define ext2_find_first_zero_bit(addr, size) \
+ ext2_find_next_zero_bit((addr), (size), 0)
+
+static __inline__ unsigned long ext2_find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
+{
+ unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
+ unsigned long result = offset & ~31UL;
+ unsigned long tmp;
+
+ if (offset >= size)
+ return size;
+ size -= result;
+ offset &= 31UL;
+ if(offset) {
+ /* We hold the little endian value in tmp, but then the
+ * shift is illegal. So we could keep a big endian value
+ * in tmp, like this:
+ *
+ * tmp = __swab32(*(p++));
+ * tmp |= ~0UL >> (32-offset);
+ *
+ * but this would decrease preformance, so we change the
+ * shift:
+ */
+ tmp = *(p++);
+ tmp |= __swab32(~0UL >> (32-offset));
+ if(size < 32)
+ goto found_first;
+ if(~tmp)
+ goto found_middle;
+ size -= 32;
+ result += 32;
+ }
+ while(size & ~31UL) {
+ if(~(tmp = *(p++)))
+ goto found_middle;
+ result += 32;
+ size -= 32;
+ }
+ if(!size)
+ return result;
+ tmp = *p;
+
+found_first:
+ /* tmp is little endian, so we would have to swab the shift,
+ * see above. But then we have to swab tmp below for ffz, so
+ * we might as well do this here.
+ */
+ return result + ffz(__swab32(tmp) | (~0UL << size));
+found_middle:
+ return result + ffz(__swab32(tmp));
+}
+
+/* Bitmap functions for the minix filesystem. */
+#define minix_test_and_set_bit(nr,addr) test_and_set_bit(nr,addr)
+#define minix_set_bit(nr,addr) set_bit(nr,addr)
+#define minix_test_and_clear_bit(nr,addr) test_and_clear_bit(nr,addr)
+#define minix_test_bit(nr,addr) test_bit(nr,addr)
+#define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)
+
+/**
+ * hweightN - returns the hamming weight of a N-bit word
+ * @x: the word to weigh
+ *
+ * The Hamming Weight of a number is the total number of bits set in it.
+ */
+
+#define hweight32(x) generic_hweight32(x)
+#define hweight16(x) generic_hweight16(x)
+#define hweight8(x) generic_hweight8(x)
+
+#endif /* __KERNEL__ */
+
+/*
+ * fls: find last bit set.
+ */
+#define fls(x) generic_fls(x)
+
+#endif /* _M68KNOMMU_BITOPS_H */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.