Import Linux's linux/include/asm-sparc64/bitopts.h.vendor/ext2fs

This is taken from the 2.4.3 Linux sources as shipped on Red Hat 7.1 Alpha.

1 files changed, 248 insertions, 0 deletions

diff --git a/sys/gnu/ext2fs/sparc64-bitops.h b/sys/gnu/ext2fs/sparc64-bitops.h
new file mode 100644
index 000000000000..26e3716ccea3
--- /dev/null
+++ b/sys/gnu/ext2fs/sparc64-bitops.h
@@ -0,0 +1,248 @@
+/* $Id: bitops.h,v 1.31 2000/09/23 02:09:21 davem Exp $
+ * bitops.h: Bit string operations on the V9.
+ *
+ * Copyright 1996, 1997 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#ifndef _SPARC64_BITOPS_H
+#define _SPARC64_BITOPS_H
+
+#include <asm/byteorder.h>
+
+extern long __test_and_set_bit(unsigned long nr, volatile void *addr);
+extern long __test_and_clear_bit(unsigned long nr, volatile void *addr);
+extern long __test_and_change_bit(unsigned long nr, volatile void *addr);
+
+#define test_and_set_bit(nr,addr)	(__test_and_set_bit(nr,addr)!=0)
+#define test_and_clear_bit(nr,addr)	(__test_and_clear_bit(nr,addr)!=0)
+#define test_and_change_bit(nr,addr)	(__test_and_change_bit(nr,addr)!=0)
+#define set_bit(nr,addr)		((void)__test_and_set_bit(nr,addr))
+#define clear_bit(nr,addr)		((void)__test_and_clear_bit(nr,addr))
+#define change_bit(nr,addr)		((void)__test_and_change_bit(nr,addr))
+
+#define smp_mb__before_clear_bit()	do { } while(0)
+#define smp_mb__after_clear_bit()	do { } while(0)
+
+extern __inline__ int test_bit(int nr, __const__ void *addr)
+{
+	return (1UL & (((__const__ long *) addr)[nr >> 6] >> (nr & 63))) != 0UL;
+}
+
+/* The easy/cheese version for now. */
+extern __inline__ unsigned long ffz(unsigned long word)
+{
+	unsigned long result;
+
+#ifdef ULTRA_HAS_POPULATION_COUNT	/* Thanks for nothing Sun... */
+	__asm__ __volatile__("
+	brz,pn	%0, 1f
+	 neg	%0, %%g1
+	xnor	%0, %%g1, %%g2
+	popc	%%g2, %0
+1:	" : "=&r" (result)
+	  : "0" (word)
+	  : "g1", "g2");
+#else
+#if 1 /* def EASY_CHEESE_VERSION */
+	result = 0;
+	while(word & 1) {
+		result++;
+		word >>= 1;
+	}
+#else
+	unsigned long tmp;
+
+	result = 0;	
+	tmp = ~word & -~word;
+	if (!(unsigned)tmp) {
+		tmp >>= 32;
+		result = 32;
+	}
+	if (!(unsigned short)tmp) {
+		tmp >>= 16;
+		result += 16;
+	}
+	if (!(unsigned char)tmp) {
+		tmp >>= 8;
+		result += 8;
+	}
+	if (tmp & 0xf0) result += 4;
+	if (tmp & 0xcc) result += 2;
+	if (tmp & 0xaa) result ++;
+#endif
+#endif
+	return result;
+}
+
+#ifdef __KERNEL__
+
+/*
+ * ffs: find first bit set. This is defined the same way as
+ * the libc and compiler builtin ffs routines, therefore
+ * differs in spirit from the above ffz (man ffs).
+ */
+
+#define ffs(x) generic_ffs(x)
+
+/*
+ * hweightN: returns the hamming weight (i.e. the number
+ * of bits set) of a N-bit word
+ */
+
+#ifdef ULTRA_HAS_POPULATION_COUNT
+
+extern __inline__ unsigned int hweight32(unsigned int w)
+{
+	unsigned int res;
+
+	__asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xffffffff));
+	return res;
+}
+
+extern __inline__ unsigned int hweight16(unsigned int w)
+{
+	unsigned int res;
+
+	__asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xffff));
+	return res;
+}
+
+extern __inline__ unsigned int hweight8(unsigned int w)
+{
+	unsigned int res;
+
+	__asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xff));
+	return res;
+}
+
+#else
+
+#define hweight32(x) generic_hweight32(x)
+#define hweight16(x) generic_hweight16(x)
+#define hweight8(x) generic_hweight8(x)
+
+#endif
+#endif /* __KERNEL__ */
+
+/* find_next_zero_bit() finds the first zero bit in a bit string of length
+ * 'size' bits, starting the search at bit 'offset'. This is largely based
+ * on Linus's ALPHA routines, which are pretty portable BTW.
+ */
+
+extern __inline__ unsigned long find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
+{
+	unsigned long *p = ((unsigned long *) addr) + (offset >> 6);
+	unsigned long result = offset & ~63UL;
+	unsigned long tmp;
+
+	if (offset >= size)
+		return size;
+	size -= result;
+	offset &= 63UL;
+	if (offset) {
+		tmp = *(p++);
+		tmp |= ~0UL >> (64-offset);
+		if (size < 64)
+			goto found_first;
+		if (~tmp)
+			goto found_middle;
+		size -= 64;
+		result += 64;
+	}
+	while (size & ~63UL) {
+		if (~(tmp = *(p++)))
+			goto found_middle;
+		result += 64;
+		size -= 64;
+	}
+	if (!size)
+		return result;
+	tmp = *p;
+
+found_first:
+	tmp |= ~0UL << size;
+	if (tmp == ~0UL)        /* Are any bits zero? */
+		return result + size; /* Nope. */
+found_middle:
+	return result + ffz(tmp);
+}
+
+#define find_first_zero_bit(addr, size) \
+        find_next_zero_bit((addr), (size), 0)
+
+extern long __test_and_set_le_bit(int nr, volatile void *addr);
+extern long __test_and_clear_le_bit(int nr, volatile void *addr);
+
+#define test_and_set_le_bit(nr,addr)	(__test_and_set_le_bit(nr,addr)!=0)
+#define test_and_clear_le_bit(nr,addr)	(__test_and_clear_le_bit(nr,addr)!=0)
+#define set_le_bit(nr,addr)		((void)__test_and_set_le_bit(nr,addr))
+#define clear_le_bit(nr,addr)		((void)__test_and_clear_le_bit(nr,addr))
+
+extern __inline__ int test_le_bit(int nr, __const__ void * addr)
+{
+	int			mask;
+	__const__ unsigned char	*ADDR = (__const__ unsigned char *) addr;
+
+	ADDR += nr >> 3;
+	mask = 1 << (nr & 0x07);
+	return ((mask & *ADDR) != 0);
+}
+
+#define find_first_zero_le_bit(addr, size) \
+        find_next_zero_le_bit((addr), (size), 0)
+
+extern __inline__ unsigned long find_next_zero_le_bit(void *addr, unsigned long size, unsigned long offset)
+{
+	unsigned long *p = ((unsigned long *) addr) + (offset >> 6);
+	unsigned long result = offset & ~63UL;
+	unsigned long tmp;
+
+	if (offset >= size)
+		return size;
+	size -= result;
+	offset &= 63UL;
+	if(offset) {
+		tmp = __swab64p(p++);
+		tmp |= (~0UL >> (64-offset));
+		if(size < 64)
+			goto found_first;
+		if(~tmp)
+			goto found_middle;
+		size -= 64;
+		result += 64;
+	}
+	while(size & ~63) {
+		if(~(tmp = __swab64p(p++)))
+			goto found_middle;
+		result += 64;
+		size -= 64;
+	}
+	if(!size)
+		return result;
+	tmp = __swab64p(p);
+found_first:
+	tmp |= (~0UL << size);
+	if (tmp == ~0UL)        /* Are any bits zero? */
+		return result + size; /* Nope. */
+found_middle:
+	return result + ffz(tmp);
+}
+
+#ifdef __KERNEL__
+
+#define ext2_set_bit			test_and_set_le_bit
+#define ext2_clear_bit			test_and_clear_le_bit
+#define ext2_test_bit  			test_le_bit
+#define ext2_find_first_zero_bit	find_first_zero_le_bit
+#define ext2_find_next_zero_bit		find_next_zero_le_bit
+
+/* 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)
+
+#endif /* __KERNEL__ */
+
+#endif /* defined(_SPARC64_BITOPS_H) */