mirror of
https://github.com/torvalds/linux.git
synced 2024-12-11 05:33:09 +00:00
68 lines
1.2 KiB
ArmAsm
68 lines
1.2 KiB
ArmAsm
|
/* fls.S: SPARC default fls definition.
|
||
|
|
*
|
||
|
|
* SPARC default fls definition, which follows the same algorithm as
|
||
|
|
* in generic fls(). This function will be boot time patched on T4
|
||
|
|
* and onward.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/linkage.h>
|
||
|
|
#include <asm/export.h>
|
||
|
|
|
||
|
|
.text
|
||
|
|
.register %g2, #scratch
|
||
|
|
.register %g3, #scratch
|
||
|
|
ENTRY(fls)
|
||
|
|
brz,pn %o0, 6f
|
||
|
|
mov 0, %o1
|
||
|
|
sethi %hi(0xffff0000), %g3
|
||
|
|
mov %o0, %g2
|
||
|
|
andcc %o0, %g3, %g0
|
||
|
|
be,pt %icc, 8f
|
||
|
|
mov 32, %o1
|
||
|
|
sethi %hi(0xff000000), %g3
|
||
|
|
andcc %g2, %g3, %g0
|
||
|
|
bne,pt %icc, 3f
|
||
|
|
sethi %hi(0xf0000000), %g3
|
||
|
|
sll %o0, 8, %o0
|
||
|
|
1:
|
||
|
|
add %o1, -8, %o1
|
||
|
|
sra %o0, 0, %o0
|
||
|
|
mov %o0, %g2
|
||
|
|
2:
|
||
|
|
sethi %hi(0xf0000000), %g3
|
||
|
|
3:
|
||
|
|
andcc %g2, %g3, %g0
|
||
|
|
bne,pt %icc, 4f
|
||
|
|
sethi %hi(0xc0000000), %g3
|
||
|
|
sll %o0, 4, %o0
|
||
|
|
add %o1, -4, %o1
|
||
|
|
sra %o0, 0, %o0
|
||
|
|
mov %o0, %g2
|
||
|
|
4:
|
||
|
|
andcc %g2, %g3, %g0
|
||
|
|
be,a,pt %icc, 7f
|
||
|
|
sll %o0, 2, %o0
|
||
|
|
5:
|
||
|
|
xnor %g0, %o0, %o0
|
||
|
|
srl %o0, 31, %o0
|
||
|
|
sub %o1, %o0, %o1
|
||
|
|
6:
|
||
|
|
jmp %o7 + 8
|
||
|
|
sra %o1, 0, %o0
|
||
|
|
7:
|
||
|
|
add %o1, -2, %o1
|
||
|
|
ba,pt %xcc, 5b
|
||
|
|
sra %o0, 0, %o0
|
||
|
|
8:
|
||
|
|
sll %o0, 16, %o0
|
||
|
|
sethi %hi(0xff000000), %g3
|
||
|
|
sra %o0, 0, %o0
|
||
|
|
mov %o0, %g2
|
||
|
|
andcc %g2, %g3, %g0
|
||
|
|
bne,pt %icc, 2b
|
||
|
|
mov 16, %o1
|
||
|
|
ba,pt %xcc, 1b
|
||
|
|
sll %o0, 8, %o0
|
||
|
|
ENDPROC(fls)
|
||
|
|
EXPORT_SYMBOL(fls)
|