| /* 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) |
