e13b91c1c4
Remove the __uc32_ prefix in find bitops functions.
Move find_* macros behind asm-generic/bitops.h inclusion.
see commit <19de85ef574c3a2182e3ccad9581805052f14946>
bitops: add #ifndef for each of find bitops
also see commit <63e424c84429903c92a0f1e9654c31ccaf6694d0>
arch: remove CONFIG_GENERIC_FIND_{NEXT_BIT,BIT_LE,LAST_BIT}
Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
100 lines
2.4 KiB
ArmAsm
100 lines
2.4 KiB
ArmAsm
/*
|
|
* linux/arch/unicore32/lib/findbit.S
|
|
*
|
|
* Code specific to PKUnity SoC and UniCore ISA
|
|
*
|
|
* Copyright (C) 2001-2010 GUAN Xue-tao
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
.text
|
|
|
|
/*
|
|
* Purpose : Find a 'zero' bit
|
|
* Prototype: int find_first_zero_bit(void *addr, unsigned int maxbit);
|
|
*/
|
|
ENTRY(find_first_zero_bit)
|
|
cxor.a r1, #0
|
|
beq 3f
|
|
mov r2, #0
|
|
1: ldb r3, [r0+], r2 >> #3
|
|
xor.a r3, r3, #0xff @ invert bits
|
|
bne .L_found @ any now set - found zero bit
|
|
add r2, r2, #8 @ next bit pointer
|
|
2: csub.a r2, r1 @ any more?
|
|
bub 1b
|
|
3: mov r0, r1 @ no free bits
|
|
mov pc, lr
|
|
ENDPROC(find_first_zero_bit)
|
|
|
|
/*
|
|
* Purpose : Find next 'zero' bit
|
|
* Prototype: int find_next_zero_bit
|
|
* (void *addr, unsigned int maxbit, int offset)
|
|
*/
|
|
ENTRY(find_next_zero_bit)
|
|
cxor.a r1, #0
|
|
beq 3b
|
|
and.a ip, r2, #7
|
|
beq 1b @ If new byte, goto old routine
|
|
ldb r3, [r0+], r2 >> #3
|
|
xor r3, r3, #0xff @ now looking for a 1 bit
|
|
mov.a r3, r3 >> ip @ shift off unused bits
|
|
bne .L_found
|
|
or r2, r2, #7 @ if zero, then no bits here
|
|
add r2, r2, #1 @ align bit pointer
|
|
b 2b @ loop for next bit
|
|
ENDPROC(find_next_zero_bit)
|
|
|
|
/*
|
|
* Purpose : Find a 'one' bit
|
|
* Prototype: int find_first_bit
|
|
* (const unsigned long *addr, unsigned int maxbit);
|
|
*/
|
|
ENTRY(find_first_bit)
|
|
cxor.a r1, #0
|
|
beq 3f
|
|
mov r2, #0
|
|
1: ldb r3, [r0+], r2 >> #3
|
|
mov.a r3, r3
|
|
bne .L_found @ any now set - found zero bit
|
|
add r2, r2, #8 @ next bit pointer
|
|
2: csub.a r2, r1 @ any more?
|
|
bub 1b
|
|
3: mov r0, r1 @ no free bits
|
|
mov pc, lr
|
|
ENDPROC(find_first_bit)
|
|
|
|
/*
|
|
* Purpose : Find next 'one' bit
|
|
* Prototype: int find_next_zero_bit
|
|
* (void *addr, unsigned int maxbit, int offset)
|
|
*/
|
|
ENTRY(find_next_bit)
|
|
cxor.a r1, #0
|
|
beq 3b
|
|
and.a ip, r2, #7
|
|
beq 1b @ If new byte, goto old routine
|
|
ldb r3, [r0+], r2 >> #3
|
|
mov.a r3, r3 >> ip @ shift off unused bits
|
|
bne .L_found
|
|
or r2, r2, #7 @ if zero, then no bits here
|
|
add r2, r2, #1 @ align bit pointer
|
|
b 2b @ loop for next bit
|
|
ENDPROC(find_next_bit)
|
|
|
|
/*
|
|
* One or more bits in the LSB of r3 are assumed to be set.
|
|
*/
|
|
.L_found:
|
|
rsub r1, r3, #0
|
|
and r3, r3, r1
|
|
cntlz r3, r3
|
|
rsub r3, r3, #31
|
|
add r0, r2, r3
|
|
mov pc, lr
|
|
|