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Linux/arch/arm/lib/delay-loop.S

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Diff markup

Differences between /arch/arm/lib/delay-loop.S (Version linux-6.12-rc7) and /arch/alpha/lib/delay-loop.S (Version linux-4.11.12)


  1 /* SPDX-License-Identifier: GPL-2.0-only */       
  2 /*                                                
  3  *  linux/arch/arm/lib/delay.S                    
  4  *                                                
  5  *  Copyright (C) 1995, 1996 Russell King         
  6  */                                               
  7 #include <linux/linkage.h>                        
  8 #include <linux/cfi_types.h>                      
  9 #include <asm/assembler.h>                        
 10 #include <asm/delay.h>                            
 11                                                   
 12 #ifdef CONFIG_ARCH_RPC                            
 13                 .arch   armv4                     
 14 #endif                                            
 15                                                   
 16                 .text                             
 17                                                   
 18 .LC0:           .word   loops_per_jiffy           
 19 .LC1:           .word   UDELAY_MULT               
 20                                                   
 21 /*                                                
 22  * loops = r0 * HZ * loops_per_jiffy / 1000000    
 23  *                                                
 24  * r0  <= 2000                                    
 25  * HZ  <= 1000                                    
 26  */                                               
 27                                                   
 28 SYM_TYPED_FUNC_START(__loop_udelay)               
 29                 ldr     r2, .LC1                  
 30                 mul     r0, r2, r0                
 31                 b       __loop_const_udelay       
 32 SYM_FUNC_END(__loop_udelay)                       
 33                                                   
 34 SYM_TYPED_FUNC_START(__loop_const_udelay)         
 35                 ldr     r2, .LC0                  
 36                 ldr     r2, [r2]                  
 37                 umull   r1, r0, r2, r0            
 38                 adds    r1, r1, #0xffffffff       
 39                 adcs    r0, r0, r0                
 40                 reteq   lr                        
 41                 b       __loop_delay              
 42 SYM_FUNC_END(__loop_const_udelay)                 
 43                                                   
 44                 .align 3                          
 45                                                   
 46 @ Delay routine                                   
 47 SYM_TYPED_FUNC_START(__loop_delay)                
 48                 subs    r0, r0, #1                
 49 #if 0                                             
 50                 retls   lr                        
 51                 subs    r0, r0, #1                
 52                 retls   lr                        
 53                 subs    r0, r0, #1                
 54                 retls   lr                        
 55                 subs    r0, r0, #1                
 56                 retls   lr                        
 57                 subs    r0, r0, #1                
 58                 retls   lr                        
 59                 subs    r0, r0, #1                
 60                 retls   lr                        
 61                 subs    r0, r0, #1                
 62                 retls   lr                        
 63                 subs    r0, r0, #1                
 64 #endif                                            
 65                 bhi     __loop_delay              
 66                 ret     lr                        
 67 SYM_FUNC_END(__loop_delay)                        
                                                      

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