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Linux/arch/sparc/lib/GENbzero.S

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Diff markup

Differences between /arch/sparc/lib/GENbzero.S (Version linux-6.12-rc7) and /arch/sparc/lib/GENbzero.S (Version linux-4.19.322)


  1 /* SPDX-License-Identifier: GPL-2.0 */            
  2 /* GENbzero.S: Generic sparc64 memset/clear_us    
  3  *                                                
  4  * Copyright (C) 2007 David S. Miller (davem@d    
  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         .align  32                                
 17         .text                                     
 18                                                   
 19         .globl          GENmemset                 
 20         .type           GENmemset, #function      
 21 GENmemset:              /* %o0=buf, %o1=pat, %    
 22         and             %o1, 0xff, %o3            
 23         mov             %o2, %o1                  
 24         sllx            %o3, 8, %g1               
 25         or              %g1, %o3, %o2             
 26         sllx            %o2, 16, %g1              
 27         or              %g1, %o2, %o2             
 28         sllx            %o2, 32, %g1              
 29         ba,pt           %xcc, 1f                  
 30          or             %g1, %o2, %o2             
 31                                                   
 32         .globl          GENbzero                  
 33         .type           GENbzero, #function       
 34 GENbzero:                                         
 35         clr             %o2                       
 36 1:      brz,pn          %o1, GENbzero_return      
 37          mov            %o0, %o3                  
 38                                                   
 39         /* %o5: saved %asi, restored at GENbze    
 40          * %o4: store %asi to use                 
 41          */                                       
 42         rd              %asi, %o5                 
 43         mov             ASI_P, %o4                
 44         wr              %o4, 0x0, %asi            
 45                                                   
 46 GENbzero_from_clear_user:                         
 47         cmp             %o1, 15                   
 48         bl,pn           %icc, GENbzero_tiny       
 49          andcc          %o0, 0x7, %g1             
 50         be,pt           %xcc, 2f                  
 51          mov            8, %g2                    
 52         sub             %g2, %g1, %g1             
 53         sub             %o1, %g1, %o1             
 54 1:      EX_ST(stba %o2, [%o0 + 0x00] %asi)        
 55         subcc           %g1, 1, %g1               
 56         bne,pt          %xcc, 1b                  
 57          add            %o0, 1, %o0               
 58 2:      cmp             %o1, 128                  
 59         bl,pn           %icc, GENbzero_medium     
 60          andcc          %o0, (64 - 1), %g1        
 61         be,pt           %xcc, GENbzero_pre_loo    
 62          mov            64, %g2                   
 63         sub             %g2, %g1, %g1             
 64         sub             %o1, %g1, %o1             
 65 1:      EX_ST(stxa %o2, [%o0 + 0x00] %asi)        
 66         subcc           %g1, 8, %g1               
 67         bne,pt          %xcc, 1b                  
 68          add            %o0, 8, %o0               
 69                                                   
 70 GENbzero_pre_loop:                                
 71         andn            %o1, (64 - 1), %g1        
 72         sub             %o1, %g1, %o1             
 73 GENbzero_loop:                                    
 74         EX_ST(stxa %o2, [%o0 + 0x00] %asi)        
 75         EX_ST(stxa %o2, [%o0 + 0x08] %asi)        
 76         EX_ST(stxa %o2, [%o0 + 0x10] %asi)        
 77         EX_ST(stxa %o2, [%o0 + 0x18] %asi)        
 78         EX_ST(stxa %o2, [%o0 + 0x20] %asi)        
 79         EX_ST(stxa %o2, [%o0 + 0x28] %asi)        
 80         EX_ST(stxa %o2, [%o0 + 0x30] %asi)        
 81         EX_ST(stxa %o2, [%o0 + 0x38] %asi)        
 82         subcc           %g1, 64, %g1              
 83         bne,pt          %xcc, GENbzero_loop       
 84          add            %o0, 64, %o0              
 85                                                   
 86         membar          #Sync                     
 87         wr              %o4, 0x0, %asi            
 88         brz,pn          %o1, GENbzero_done        
 89 GENbzero_medium:                                  
 90          andncc         %o1, 0x7, %g1             
 91         be,pn           %xcc, 2f                  
 92          sub            %o1, %g1, %o1             
 93 1:      EX_ST(stxa %o2, [%o0 + 0x00] %asi)        
 94         subcc           %g1, 8, %g1               
 95         bne,pt          %xcc, 1b                  
 96          add            %o0, 8, %o0               
 97 2:      brz,pt          %o1, GENbzero_done        
 98          nop                                      
 99                                                   
100 GENbzero_tiny:                                    
101 1:      EX_ST(stba %o2, [%o0 + 0x00] %asi)        
102         subcc           %o1, 1, %o1               
103         bne,pt          %icc, 1b                  
104          add            %o0, 1, %o0               
105                                                   
106         /* fallthrough */                         
107                                                   
108 GENbzero_done:                                    
109         wr              %o5, 0x0, %asi            
110                                                   
111 GENbzero_return:                                  
112         retl                                      
113          mov            %o3, %o0                  
114         .size           GENbzero, .-GENbzero      
115         .size           GENmemset, .-GENmemset    
116                                                   
117         .globl          GENclear_user             
118         .type           GENclear_user, #functi    
119 GENclear_user:          /* %o0=buf, %o1=len */    
120         rd              %asi, %o5                 
121         brz,pn          %o1, GENbzero_done        
122          clr            %o3                       
123         cmp             %o5, ASI_AIUS             
124         bne,pn          %icc, GENbzero            
125          clr            %o2                       
126         ba,pt           %xcc, GENbzero_from_cl    
127          mov            ASI_AIUS, %o4             
128         .size           GENclear_user, .-GENcl    
129                                                   
130 #define BRANCH_ALWAYS   0x10680000                
131 #define NOP             0x01000000                
132 #define GEN_DO_PATCH(OLD, NEW)  \                 
133         sethi   %hi(NEW), %g1; \                  
134         or      %g1, %lo(NEW), %g1; \             
135         sethi   %hi(OLD), %g2; \                  
136         or      %g2, %lo(OLD), %g2; \             
137         sub     %g1, %g2, %g1; \                  
138         sethi   %hi(BRANCH_ALWAYS), %g3; \        
139         sll     %g1, 11, %g1; \                   
140         srl     %g1, 11 + 2, %g1; \               
141         or      %g3, %lo(BRANCH_ALWAYS), %g3;     
142         or      %g3, %g1, %g3; \                  
143         stw     %g3, [%g2]; \                     
144         sethi   %hi(NOP), %g3; \                  
145         or      %g3, %lo(NOP), %g3; \             
146         stw     %g3, [%g2 + 0x4]; \               
147         flush   %g2;                              
148                                                   
149         .globl  generic_patch_bzero               
150         .type   generic_patch_bzero,#function     
151 generic_patch_bzero:                              
152         GEN_DO_PATCH(memset, GENmemset)           
153         GEN_DO_PATCH(__bzero, GENbzero)           
154         GEN_DO_PATCH(__clear_user, GENclear_us    
155         retl                                      
156          nop                                      
157         .size   generic_patch_bzero,.-generic_    
                                                      

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