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!
411 lines
11 KiB
C
411 lines
11 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/config.h>
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#include <linux/compiler.h>
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#include <asm/byteorder.h> /* swab32 */
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#include <asm/system.h>
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#ifdef __KERNEL__
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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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#define find_first_zero_bit(addr, size) \
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find_next_zero_bit((addr), (size), 0)
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#define ffs(x) generic_ffs(x)
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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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static __inline__ int find_next_zero_bit (const unsigned long * addr, int size, int offset)
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{
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unsigned long *p = (unsigned long *)(((unsigned long)addr + (offset >> 3)) & ~3);
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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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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 long *p = (unsigned long *)(((unsigned long)addr + (offset >> 3)) & ~3);
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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)
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return result + size;
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found_middle:
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return result + __ffs(tmp);
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}
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#define find_first_bit(addr, size) find_next_bit(addr, size, 0)
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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(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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/*
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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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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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#define ext2_set_bit_atomic(lock, nr, addr) ext2_set_bit(nr, addr)
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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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#define ext2_clear_bit_atomic(lock, nr, addr) ext2_set_bit(nr, addr)
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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 performance, 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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/* 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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#endif /* __KERNEL__ */
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#define fls(x) generic_fls(x)
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#endif /* _H8300_BITOPS_H */
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