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Linux/arch/sparc/lib/NGbzero.S

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /* NGbzero.S: Niagara optimized memset/clear_user.
  3  *
  4  * Copyright (C) 2006 David S. Miller (davem@davemloft.net)
  5  */
  6 #include <asm/asi.h>
  7 
  8 #define EX_ST(x,y)              \
  9 98:     x,y;                    \
 10         .section __ex_table,"a";\
 11         .align 4;               \
 12         .word 98b, __retl_o1_asi;\
 13         .text;                  \
 14         .align 4;
 15 
 16         .text
 17 
 18         .globl          NGmemset
 19         .type           NGmemset, #function
 20 NGmemset:               /* %o0=buf, %o1=pat, %o2=len */
 21         and             %o1, 0xff, %o3
 22         mov             %o2, %o1
 23         sllx            %o3, 8, %g1
 24         or              %g1, %o3, %o2
 25         sllx            %o2, 16, %g1
 26         or              %g1, %o2, %o2
 27         sllx            %o2, 32, %g1
 28         ba,pt           %xcc, 1f
 29          or             %g1, %o2, %o2
 30 
 31         .globl          NGbzero
 32         .type           NGbzero, #function
 33 NGbzero:
 34         clr             %o2
 35 1:      brz,pn          %o1, NGbzero_return
 36          mov            %o0, %o3
 37 
 38         /* %o5: saved %asi, restored at NGbzero_done
 39          * %g7: store-init %asi to use
 40          * %o4: non-store-init %asi to use
 41          */
 42         rd              %asi, %o5
 43         mov             ASI_BLK_INIT_QUAD_LDD_P, %g7
 44         mov             ASI_P, %o4
 45         wr              %o4, 0x0, %asi
 46 
 47 NGbzero_from_clear_user:
 48         cmp             %o1, 15
 49         bl,pn           %icc, NGbzero_tiny
 50          andcc          %o0, 0x7, %g1
 51         be,pt           %xcc, 2f
 52          mov            8, %g2
 53         sub             %g2, %g1, %g1
 54         sub             %o1, %g1, %o1
 55 1:      EX_ST(stba %o2, [%o0 + 0x00] %asi)
 56         subcc           %g1, 1, %g1
 57         bne,pt          %xcc, 1b
 58          add            %o0, 1, %o0
 59 2:      cmp             %o1, 128
 60         bl,pn           %icc, NGbzero_medium
 61          andcc          %o0, (64 - 1), %g1
 62         be,pt           %xcc, NGbzero_pre_loop
 63          mov            64, %g2
 64         sub             %g2, %g1, %g1
 65         sub             %o1, %g1, %o1
 66 1:      EX_ST(stxa %o2, [%o0 + 0x00] %asi)
 67         subcc           %g1, 8, %g1
 68         bne,pt          %xcc, 1b
 69          add            %o0, 8, %o0
 70 
 71 NGbzero_pre_loop:
 72         wr              %g7, 0x0, %asi
 73         andn            %o1, (64 - 1), %g1
 74         sub             %o1, %g1, %o1
 75 NGbzero_loop:
 76         EX_ST(stxa %o2, [%o0 + 0x00] %asi)
 77         EX_ST(stxa %o2, [%o0 + 0x08] %asi)
 78         EX_ST(stxa %o2, [%o0 + 0x10] %asi)
 79         EX_ST(stxa %o2, [%o0 + 0x18] %asi)
 80         EX_ST(stxa %o2, [%o0 + 0x20] %asi)
 81         EX_ST(stxa %o2, [%o0 + 0x28] %asi)
 82         EX_ST(stxa %o2, [%o0 + 0x30] %asi)
 83         EX_ST(stxa %o2, [%o0 + 0x38] %asi)
 84         subcc           %g1, 64, %g1
 85         bne,pt          %xcc, NGbzero_loop
 86          add            %o0, 64, %o0
 87 
 88         membar          #Sync
 89         wr              %o4, 0x0, %asi
 90         brz,pn          %o1, NGbzero_done
 91 NGbzero_medium:
 92          andncc         %o1, 0x7, %g1
 93         be,pn           %xcc, 2f
 94          sub            %o1, %g1, %o1
 95 1:      EX_ST(stxa %o2, [%o0 + 0x00] %asi)
 96         subcc           %g1, 8, %g1
 97         bne,pt          %xcc, 1b
 98          add            %o0, 8, %o0
 99 2:      brz,pt          %o1, NGbzero_done
100          nop
101 
102 NGbzero_tiny:
103 1:      EX_ST(stba %o2, [%o0 + 0x00] %asi)
104         subcc           %o1, 1, %o1
105         bne,pt          %icc, 1b
106          add            %o0, 1, %o0
107 
108         /* fallthrough */
109 
110 NGbzero_done:
111         wr              %o5, 0x0, %asi
112 
113 NGbzero_return:
114         retl
115          mov            %o3, %o0
116         .size           NGbzero, .-NGbzero
117         .size           NGmemset, .-NGmemset
118 
119         .globl          NGclear_user
120         .type           NGclear_user, #function
121 NGclear_user:           /* %o0=buf, %o1=len */
122         rd              %asi, %o5
123         brz,pn          %o1, NGbzero_done
124          clr            %o3
125         cmp             %o5, ASI_AIUS
126         bne,pn          %icc, NGbzero
127          clr            %o2
128         mov             ASI_BLK_INIT_QUAD_LDD_AIUS, %g7
129         ba,pt           %xcc, NGbzero_from_clear_user
130          mov            ASI_AIUS, %o4
131         .size           NGclear_user, .-NGclear_user
132 
133 #define BRANCH_ALWAYS   0x10680000
134 #define NOP             0x01000000
135 #define NG_DO_PATCH(OLD, NEW)   \
136         sethi   %hi(NEW), %g1; \
137         or      %g1, %lo(NEW), %g1; \
138         sethi   %hi(OLD), %g2; \
139         or      %g2, %lo(OLD), %g2; \
140         sub     %g1, %g2, %g1; \
141         sethi   %hi(BRANCH_ALWAYS), %g3; \
142         sll     %g1, 11, %g1; \
143         srl     %g1, 11 + 2, %g1; \
144         or      %g3, %lo(BRANCH_ALWAYS), %g3; \
145         or      %g3, %g1, %g3; \
146         stw     %g3, [%g2]; \
147         sethi   %hi(NOP), %g3; \
148         or      %g3, %lo(NOP), %g3; \
149         stw     %g3, [%g2 + 0x4]; \
150         flush   %g2;
151 
152         .globl  niagara_patch_bzero
153         .type   niagara_patch_bzero,#function
154 niagara_patch_bzero:
155         NG_DO_PATCH(memset, NGmemset)
156         NG_DO_PATCH(__bzero, NGbzero)
157         NG_DO_PATCH(__clear_user, NGclear_user)
158         NG_DO_PATCH(tsb_init, NGtsb_init)
159         retl
160          nop
161         .size   niagara_patch_bzero,.-niagara_patch_bzero

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