forked from Minki/linux
61f2e7b0f4
minix bit operations are only used by minix filesystem and useless by other modules. Because byte order of inode and block bitmaps is different on each architecture like below: m68k: big-endian 16bit indexed bitmaps h8300, microblaze, s390, sparc, m68knommu: big-endian 32 or 64bit indexed bitmaps m32r, mips, sh, xtensa: big-endian 32 or 64bit indexed bitmaps for big-endian mode little-endian bitmaps for little-endian mode Others: little-endian bitmaps In order to move minix bit operations from asm/bitops.h to architecture independent code in minix filesystem, this provides two config options. CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED is only selected by m68k. CONFIG_MINIX_FS_NATIVE_ENDIAN is selected by the architectures which use native byte order bitmaps (h8300, microblaze, s390, sparc, m68knommu, m32r, mips, sh, xtensa). The architectures which always use little-endian bitmaps do not select these options. Finally, we can remove minix bit operations from asm/bitops.h for all architectures. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Greg Ungerer <gerg@uclinux.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Andreas Schwab <schwab@linux-m68k.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Michal Simek <monstr@monstr.eu> Cc: "David S. Miller" <davem@davemloft.net> Cc: Hirokazu Takata <takata@linux-m32r.org> Acked-by: Ralf Baechle <ralf@linux-mips.org> Acked-by: Paul Mundt <lethal@linux-sh.org> Cc: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
213 lines
6.0 KiB
C
213 lines
6.0 KiB
C
#ifndef _H8300_BITOPS_H
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#define _H8300_BITOPS_H
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/*
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* Copyright 1992, Linus Torvalds.
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* Copyright 2002, Yoshinori Sato
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*/
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#include <linux/compiler.h>
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#include <asm/system.h>
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#ifdef __KERNEL__
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#ifndef _LINUX_BITOPS_H
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#error only <linux/bitops.h> can be included directly
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#endif
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/*
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* Function prototypes to keep gcc -Wall happy
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*/
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/*
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* ffz = Find First Zero in word. Undefined if no zero exists,
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* so code should check against ~0UL first..
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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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result = -1;
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__asm__("1:\n\t"
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"shlr.l %2\n\t"
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"adds #1,%0\n\t"
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"bcs 1b"
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: "=r" (result)
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: "0" (result),"r" (word));
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return result;
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}
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#define H8300_GEN_BITOP_CONST(OP,BIT) \
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case BIT: \
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__asm__(OP " #" #BIT ",@%0"::"r"(b_addr):"memory"); \
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break;
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#define H8300_GEN_BITOP(FNAME,OP) \
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static __inline__ void FNAME(int nr, volatile unsigned long* addr) \
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{ \
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volatile unsigned char *b_addr; \
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b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3); \
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if (__builtin_constant_p(nr)) { \
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switch(nr & 7) { \
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H8300_GEN_BITOP_CONST(OP,0) \
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H8300_GEN_BITOP_CONST(OP,1) \
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H8300_GEN_BITOP_CONST(OP,2) \
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H8300_GEN_BITOP_CONST(OP,3) \
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H8300_GEN_BITOP_CONST(OP,4) \
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H8300_GEN_BITOP_CONST(OP,5) \
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H8300_GEN_BITOP_CONST(OP,6) \
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H8300_GEN_BITOP_CONST(OP,7) \
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} \
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} else { \
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__asm__(OP " %w0,@%1"::"r"(nr),"r"(b_addr):"memory"); \
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} \
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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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H8300_GEN_BITOP(set_bit ,"bset")
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H8300_GEN_BITOP(clear_bit ,"bclr")
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H8300_GEN_BITOP(change_bit,"bnot")
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#define __set_bit(nr,addr) set_bit((nr),(addr))
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#define __clear_bit(nr,addr) clear_bit((nr),(addr))
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#define __change_bit(nr,addr) change_bit((nr),(addr))
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#undef H8300_GEN_BITOP
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#undef H8300_GEN_BITOP_CONST
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static __inline__ int test_bit(int nr, const unsigned long* addr)
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{
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return (*((volatile unsigned char *)addr +
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((nr >> 3) ^ 3)) & (1UL << (nr & 7))) != 0;
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}
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#define __test_bit(nr, addr) test_bit(nr, addr)
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#define H8300_GEN_TEST_BITOP_CONST_INT(OP,BIT) \
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case BIT: \
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__asm__("stc ccr,%w1\n\t" \
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"orc #0x80,ccr\n\t" \
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"bld #" #BIT ",@%4\n\t" \
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OP " #" #BIT ",@%4\n\t" \
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"rotxl.l %0\n\t" \
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"ldc %w1,ccr" \
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: "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr) \
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: "0" (retval),"r" (b_addr) \
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: "memory"); \
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break;
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#define H8300_GEN_TEST_BITOP_CONST(OP,BIT) \
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case BIT: \
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__asm__("bld #" #BIT ",@%3\n\t" \
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OP " #" #BIT ",@%3\n\t" \
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"rotxl.l %0\n\t" \
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: "=r"(retval),"=m"(*b_addr) \
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: "0" (retval),"r" (b_addr) \
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: "memory"); \
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break;
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#define H8300_GEN_TEST_BITOP(FNNAME,OP) \
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static __inline__ int FNNAME(int nr, volatile void * addr) \
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{ \
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int retval = 0; \
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char ccrsave; \
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volatile unsigned char *b_addr; \
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b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3); \
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if (__builtin_constant_p(nr)) { \
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switch(nr & 7) { \
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H8300_GEN_TEST_BITOP_CONST_INT(OP,0) \
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H8300_GEN_TEST_BITOP_CONST_INT(OP,1) \
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H8300_GEN_TEST_BITOP_CONST_INT(OP,2) \
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H8300_GEN_TEST_BITOP_CONST_INT(OP,3) \
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H8300_GEN_TEST_BITOP_CONST_INT(OP,4) \
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H8300_GEN_TEST_BITOP_CONST_INT(OP,5) \
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H8300_GEN_TEST_BITOP_CONST_INT(OP,6) \
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H8300_GEN_TEST_BITOP_CONST_INT(OP,7) \
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} \
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} else { \
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__asm__("stc ccr,%w1\n\t" \
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"orc #0x80,ccr\n\t" \
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"btst %w5,@%4\n\t" \
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OP " %w5,@%4\n\t" \
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"beq 1f\n\t" \
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"inc.l #1,%0\n" \
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"1:\n\t" \
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"ldc %w1,ccr" \
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: "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr) \
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: "0" (retval),"r" (b_addr),"r"(nr) \
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: "memory"); \
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} \
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return retval; \
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} \
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\
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static __inline__ int __ ## FNNAME(int nr, volatile void * addr) \
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{ \
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int retval = 0; \
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volatile unsigned char *b_addr; \
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b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3); \
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if (__builtin_constant_p(nr)) { \
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switch(nr & 7) { \
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H8300_GEN_TEST_BITOP_CONST(OP,0) \
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H8300_GEN_TEST_BITOP_CONST(OP,1) \
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H8300_GEN_TEST_BITOP_CONST(OP,2) \
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H8300_GEN_TEST_BITOP_CONST(OP,3) \
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H8300_GEN_TEST_BITOP_CONST(OP,4) \
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H8300_GEN_TEST_BITOP_CONST(OP,5) \
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H8300_GEN_TEST_BITOP_CONST(OP,6) \
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H8300_GEN_TEST_BITOP_CONST(OP,7) \
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} \
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} else { \
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__asm__("btst %w4,@%3\n\t" \
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OP " %w4,@%3\n\t" \
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"beq 1f\n\t" \
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"inc.l #1,%0\n" \
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"1:" \
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: "=r"(retval),"=m"(*b_addr) \
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: "0" (retval),"r" (b_addr),"r"(nr) \
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: "memory"); \
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} \
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return retval; \
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}
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H8300_GEN_TEST_BITOP(test_and_set_bit, "bset")
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H8300_GEN_TEST_BITOP(test_and_clear_bit, "bclr")
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H8300_GEN_TEST_BITOP(test_and_change_bit,"bnot")
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#undef H8300_GEN_TEST_BITOP_CONST
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#undef H8300_GEN_TEST_BITOP_CONST_INT
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#undef H8300_GEN_TEST_BITOP
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#include <asm-generic/bitops/ffs.h>
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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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result = -1;
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__asm__("1:\n\t"
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"shlr.l %2\n\t"
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"adds #1,%0\n\t"
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"bcc 1b"
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: "=r" (result)
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: "0"(result),"r"(word));
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return result;
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}
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#include <asm-generic/bitops/find.h>
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#include <asm-generic/bitops/sched.h>
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#include <asm-generic/bitops/hweight.h>
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#include <asm-generic/bitops/lock.h>
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#include <asm-generic/bitops/le.h>
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#include <asm-generic/bitops/ext2-atomic.h>
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#endif /* __KERNEL__ */
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#include <asm-generic/bitops/fls.h>
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#include <asm-generic/bitops/__fls.h>
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#include <asm-generic/bitops/fls64.h>
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#endif /* _H8300_BITOPS_H */
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