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- /* SPDX-License-Identifier: GPL-2.0 */
- /* bzero.S: Simple prefetching memset, bzero, and clear_user
- * implementations.
- *
- * Copyright (C) 2005 David S. Miller <davem@davemloft.net>
- */
- #include <linux/linkage.h>
- #include <asm/export.h>
- .text
- ENTRY(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
- ENTRY(__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
- ENDPROC(__bzero)
- ENDPROC(memset)
- EXPORT_SYMBOL(__bzero)
- EXPORT_SYMBOL(memset)
- #define EX_ST(x,y) \
- 98: x,y; \
- .section __ex_table,"a";\
- .align 4; \
- .word 98b, __retl_o1; \
- .text; \
- .align 4;
- ENTRY(__clear_user) /* %o0=buf, %o1=len */
- brz,pn %o1, __clear_user_done
- cmp %o1, 16
- bl,pn %icc, __clear_user_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, __clear_user_done
- nop
- __clear_user_tiny:
- 1: EX_ST(stba %g0, [%o0 + 0x00] %asi)
- subcc %o1, 1, %o1
- bne,pt %icc, 1b
- add %o0, 1, %o0
- __clear_user_done:
- retl
- clr %o0
- ENDPROC(__clear_user)
- EXPORT_SYMBOL(__clear_user)
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