tmpreset.s

完整的Bell实验室的嵌入式文件系统TFS

# 1 "reset.s"
 




















# 1 "cpu.h" 1
 






























 












 











 




# 22 "reset.s" 2

# 1 "cpuio.h" 1




# 23 "reset.s" 2


 
    
     
    . 1 

 
    
     



     
    .equ MonStackSz, 4096
    .equ FiqStackSz, 4096
    .equ IrqStackSz, 4096
    .equ AbtStackSz, 4096
    .equ UndStackSz, 4096
    .equ SysStackSz, 4096 

     
    .global MonStack
    .global FiqStack
    .global IrqStack
    .global AbtStack
    .global UndStack
    .global SysStack        
    
     
    .comm   MonStack, MonStackSz     
    .comm   FiqStack, FiqStackSz     
    .comm   IrqStack, IrqStackSz     
    .comm   AbtStack, AbtStackSz     
    .comm   UndStack, UndStackSz     
    .comm   SysStack, SysStackSz     
     

 
    
    .extern undefined_instruction
    .extern software_interrupt
    .extern abort_prefetch
    .extern abort_data
    .extern not_used
    .extern interrupt_request
    .extern fast_interrupt_request
    .extern start

    .global reset
    .global coldstart
    .global lukewarmstart
    .global warmstart
    .global ipaddr
    .global etheraddr
    .global moncomptr

 
    
    .text

 
        
     

 
reset:  
    b do_reset
    b undefined_instruction
    b software_interrupt
    b abort_prefetch
    b abort_data
    b not_used
    b interrupt_request
    b fast_interrupt_request

 
    
     



 

ipaddr:
    .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
    .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
    .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
    
etheraddr:
    .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
    .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
    .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff

    @@
    @@ Pointer to the 'moncom' link function at 0x00000050
    @@
    
moncomptr:
    .long   moncom

 
    
do_reset:
     






 

coldstart:

     



     

    mov r1, #0x90000000  
    add r1, r1, #0x50000     
    mov r2, #0x0         
    str r2, [r1, #0x4]   


     



         




     



    mov r1, #0x90000000      
    add r1, r1, #0x20000     
    mov r2, #0x0b        
                     
                     
    str r2, [r1, #0x14]       

     


    
# 210 "reset.s"


     



     

    mov r1, #0xA0000000  

     









    ldr r2, =0xAAAAAA9F
    str r2, [r1, #0x04]  
    ldr r2, =0xAAAAAAAA
    str r2, [r1, #0x08]         
    str r2, [r1, #0x0C]         

    ldr r2, =0xAAAAAA7F
    str r2, [r1, #0x20]     
    ldr r2, =0xAAAAAAAA
    str r2, [r1, #0x24]         
    str r2, [r1, #0x28]         

     
















    ldr r2, =0x003001B1     
    str r2, [r1, #0x1C]  

     
    ldr r2, =0x72547254
    str r2, [r1, #0x00]  

     
    ldr r1, =0xC0000000
.rept   8   
    ldr r0, [r1]
.endr

    mov r1, #0xA0000000  

     




















    ldr r2, =0x7254a265  
    str r2, [r1, #0x00]  

            

     











    
    ldr r2, =0x47704770 
    str r2, [r1, #0x10]  

    ldr r2, =0x22212419 
    str r2, [r1, #0x14]  

    ldr r2, =0x42196669 
    str r2, [r1, #0x2C]  

    ldr r2, =0xafccafcc 
    str r2, [r1, #0x30]  

     

    ldr r2, =0x994a994a
    str r2, [r1, #0x18]






        
     


    
# 348 "reset.s"

    
     
    






    mov r0, #(3<<4) 
    
     

 
    
lukewarmstart:  
     
    mov r11, r0

     

 

     



     
    mrs r0, cpsr                 
    bic r0, r0, #0x1f            
    orr r0, r0, #0x11            
    msr CPSR_c, r0               
    ldr sp, =(FiqStack + FiqStackSz - 4)     
     
    mrs r0, cpsr                 
    bic r0, r0, #0x1f            
    orr r0, r0, #0x12            
    msr CPSR_c, r0               
    ldr sp, =(IrqStack + IrqStackSz - 4)     
     
    mrs r0, cpsr                 
    bic r0, r0, #0x1f            
    orr r0, r0, #0x17            
    msr CPSR_c, r0               
    ldr sp, =(AbtStack + AbtStackSz - 4)     
     
    mrs r0, cpsr                 
    bic r0, r0, #0x1f            
    orr r0, r0, #0x1b            
    msr CPSR_c, r0               
    ldr sp, =(UndStack + UndStackSz - 4)     
     
    mrs r0, cpsr                 
    bic r0, r0, #0x1f            
    orr r0, r0, #0x1f            
    msr CPSR_c, r0               
    ldr sp, =(SysStack + SysStackSz - 4)     
     


    mov r0, r11      
    b   warmstart

    
 

bailout:
    mov r0, #(7<<4) 
    b   warmstart

 
    
warmstart:
     
    mov r11, r0

     

 


     
    mrs r0, cpsr                 
    bic r0, r0, #0x1f            
    orr r0, r0, #0x13            
    msr CPSR_c, r0               
     
    ldr sp, =(MonStack + MonStackSz - 4)

     


 
    
    mov r0, r11
jump_to_c:
    bl start

     
    b reset

.align 4