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kernel_samsung_sm7125/arch/sparc64/lib/bzero.S

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Linux-2.6.12-rc2 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!
20 years ago
/* bzero.S: Simple prefetching memset, bzero, and clear_user
* implementations.
*
* Copyright (C) 2005 David S. Miller <davem@davemloft.net>
*/
.text
.globl __memset
.type __memset, #function
__memset: /* %o0=buf, %o1=pat, %o2=len */
.globl memset
.type memset, #function
memset: /* %o0=buf, %o1=pat, %o2=len */
and %o1, 0xff, %o3
mov %o2, %o1
sllx %o3, 8, %g1
or %g1, %o3, %o2
sllx %o2, 16, %g1
or %g1, %o2, %o2
sllx %o2, 32, %g1
ba,pt %xcc, 1f
or %g1, %o2, %o2
.globl __bzero
.type __bzero, #function
__bzero: /* %o0=buf, %o1=len */
clr %o2
1: mov %o0, %o3
brz,pn %o1, __bzero_done
cmp %o1, 16
bl,pn %icc, __bzero_tiny
prefetch [%o0 + 0x000], #n_writes
andcc %o0, 0x3, %g0
be,pt %icc, 2f
1: stb %o2, [%o0 + 0x00]
add %o0, 1, %o0
andcc %o0, 0x3, %g0
bne,pn %icc, 1b
sub %o1, 1, %o1
2: andcc %o0, 0x7, %g0
be,pt %icc, 3f
stw %o2, [%o0 + 0x00]
sub %o1, 4, %o1
add %o0, 4, %o0
3: and %o1, 0x38, %g1
cmp %o1, 0x40
andn %o1, 0x3f, %o4
bl,pn %icc, 5f
and %o1, 0x7, %o1
prefetch [%o0 + 0x040], #n_writes
prefetch [%o0 + 0x080], #n_writes
prefetch [%o0 + 0x0c0], #n_writes
prefetch [%o0 + 0x100], #n_writes
prefetch [%o0 + 0x140], #n_writes
4: prefetch [%o0 + 0x180], #n_writes
stx %o2, [%o0 + 0x00]
stx %o2, [%o0 + 0x08]
stx %o2, [%o0 + 0x10]
stx %o2, [%o0 + 0x18]
stx %o2, [%o0 + 0x20]
stx %o2, [%o0 + 0x28]
stx %o2, [%o0 + 0x30]
stx %o2, [%o0 + 0x38]
subcc %o4, 0x40, %o4
bne,pt %icc, 4b
add %o0, 0x40, %o0
brz,pn %g1, 6f
nop
5: stx %o2, [%o0 + 0x00]
subcc %g1, 8, %g1
bne,pt %icc, 5b
add %o0, 0x8, %o0
6: brz,pt %o1, __bzero_done
nop
__bzero_tiny:
1: stb %o2, [%o0 + 0x00]
subcc %o1, 1, %o1
bne,pt %icc, 1b
add %o0, 1, %o0
__bzero_done:
retl
mov %o3, %o0
.size __bzero, .-__bzero
.size __memset, .-__memset
.size memset, .-memset
#define EX_ST(x,y) \
98: x,y; \
.section .fixup; \
.align 4; \
99: retl; \
mov %o1, %o0; \
.section __ex_table; \
.align 4; \
.word 98b, 99b; \
.text; \
.align 4;
.globl __bzero_noasi
.type __bzero_noasi, #function
__bzero_noasi: /* %o0=buf, %o1=len */
brz,pn %o1, __bzero_noasi_done
cmp %o1, 16
bl,pn %icc, __bzero_noasi_tiny
EX_ST(prefetcha [%o0 + 0x00] %asi, #n_writes)
andcc %o0, 0x3, %g0
be,pt %icc, 2f
1: EX_ST(stba %g0, [%o0 + 0x00] %asi)
add %o0, 1, %o0
andcc %o0, 0x3, %g0
bne,pn %icc, 1b
sub %o1, 1, %o1
2: andcc %o0, 0x7, %g0
be,pt %icc, 3f
EX_ST(stwa %g0, [%o0 + 0x00] %asi)
sub %o1, 4, %o1
add %o0, 4, %o0
3: and %o1, 0x38, %g1
cmp %o1, 0x40
andn %o1, 0x3f, %o4
bl,pn %icc, 5f
and %o1, 0x7, %o1
EX_ST(prefetcha [%o0 + 0x040] %asi, #n_writes)
EX_ST(prefetcha [%o0 + 0x080] %asi, #n_writes)
EX_ST(prefetcha [%o0 + 0x0c0] %asi, #n_writes)
EX_ST(prefetcha [%o0 + 0x100] %asi, #n_writes)
EX_ST(prefetcha [%o0 + 0x140] %asi, #n_writes)
4: EX_ST(prefetcha [%o0 + 0x180] %asi, #n_writes)
EX_ST(stxa %g0, [%o0 + 0x00] %asi)
EX_ST(stxa %g0, [%o0 + 0x08] %asi)
EX_ST(stxa %g0, [%o0 + 0x10] %asi)
EX_ST(stxa %g0, [%o0 + 0x18] %asi)
EX_ST(stxa %g0, [%o0 + 0x20] %asi)
EX_ST(stxa %g0, [%o0 + 0x28] %asi)
EX_ST(stxa %g0, [%o0 + 0x30] %asi)
EX_ST(stxa %g0, [%o0 + 0x38] %asi)
subcc %o4, 0x40, %o4
bne,pt %icc, 4b
add %o0, 0x40, %o0
brz,pn %g1, 6f
nop
5: EX_ST(stxa %g0, [%o0 + 0x00] %asi)
subcc %g1, 8, %g1
bne,pt %icc, 5b
add %o0, 0x8, %o0
6: brz,pt %o1, __bzero_noasi_done
nop
__bzero_noasi_tiny:
1: EX_ST(stba %g0, [%o0 + 0x00] %asi)
subcc %o1, 1, %o1
bne,pt %icc, 1b
add %o0, 1, %o0
__bzero_noasi_done:
retl
clr %o0
.size __bzero_noasi, .-__bzero_noasi