git.zerfleddert.de Git - linexec-j720/blob - asm/asm.asm

   1         TTL     C:\pocket\test\asm.cpp
   2
   3         AREA    |.drectve|, DRECTVE
   4         DCB     "-defaultlib:coredll.lib "
   5         DCB     "-defaultlib:corelibc.lib "
   6
   7         EXPORT  |?do_it@@YAXXZ|                         ; do_it
   8         AREA    |.pdata|, PDATA
   9 |$T222| DCD     |?do_it@@YAXXZ|
  10         DCD     0x40000100
  11         AREA    |.text|, CODE
  12 |?do_it@@YAXXZ| PROC                                    ; do_it
  13 |$M220|
  14
  15
  16                 mcr     p15, 0, r0, c7, c5, 0   ;/* invalidate i cache & BTB */
  17                 mrc     p15, 0, r0, c2, c0, 0
  18                 mov     r0, r0
  19                 sub     pc, pc, #4
  20
  21
  22 ; turn off LCD controller...
  23 ; I couldn't figure out how to use armasm.exe conditional with variables
  24 ; #if xscale
  25 ;               ldr     r9, =0x44000000
  26 ;               ldr     r8, [r9]
  27 ;               orr     r8, r8, #0x400
  28 ;               str     r8, [r9]
  29
  30 ; #elif strongarm
  31                 ldr     r9, =0xb0100000
  32                 ldr     r8, [r9]
  33                 bic     r8, r8, #1
  34                 str     r8, [r9]
  35
  36                 mov     r8, #0
  37                 ldr     r9, =0x48000000
  38                 str     r8, [r9, #0x1FC]
  39
  40
  41 ; turn off unused serial ports
  42
  43                 mov r8, #0
  44                 ldr r9, =0x80010000
  45                 str r8, [r9, #0xC]
  46                 ldr r9, =0x80050000
  47                 str r8, [r9, #0xC]
  48
  49 ; #endif
  50
  51                 add     r9, r1, #0x100
  52
  53 ; #if xscale
  54 ;               ldr     r5, =0xa0000100
  55 ;               ldr     r7, =0xa0400000
  56
  57 ; #elif strongarm
  58                 ldr     r5, =0xc0000100
  59                 ldr     r7, =0xc0400000
  60 ; #endif
  61
  62
  63 label           ldr     r8, [r9]
  64                 str     r8, [r5]
  65                 add     r9, r9, #4
  66                 add     r5, r5, #4
  67                 cmp     r5, r7
  68                 blt     label
  69
  70 ; #if xscale
  71 ;               MOV     r4, #0xA0000000
  72
  73 ; #elif strongarm
  74                 MOV     r4, #0xc0000000
  75 ; #endif
  76
  77                 add     r11,r4,#0x8000
  78
  79                 mov     r10,r2          ;machine number passed from DRAMloader
  80
  81                 mcr     p15, 0, r0, c8, c7, 0x00 ;/* invalidate I+D TLB */
  82                 mrc     p15, 0, r0, c2, c0, 0
  83                 mov     r0, r0
  84                 sub     pc, pc, #4
  85
  86 ; they skipped this, unnecessary? seems like we need to do this
  87
  88                 mcr     p15, 0, r0, c7, c5, 0   ;/* invalidate i cache & BTB */
  89
  90                 mov     r0, #0
  91                 mcr     p15, 0, r0, c13, c0, 0
  92                 mrc     p15, 0, r0, c2, c0, 0
  93                 mov     r0, r0
  94                 sub     pc, pc, #4
  95
  96 ; This is needed to get Linux 2.6 booting
  97                 mov     r0, #0
  98                 mcr     p15, 0, r0, c7, c10, 4  ; Drain write buffer
  99                 mcr     p15, 0, r0, c7, c7, 0   ; invalidate I+D & BTB
 100
 101                 mrc     p15, 0, r0, c1, c0, 0
 102                 bic     r0, r0, #5              ; MMU & Dcache off
 103                 bic     r0, r0, #0x1000         ; Icache off
 104                 mcr     p15, 0, r0, c1, c0, 0   ; disable the MMU & caches
 105                 mrc     p15, 0, r0, c2, c0, 0
 106                 mov     r0, r0
 107                 sub     pc, pc, #4
 108
 109
 110                 mov     r0, #0
 111                 mcr     p15, 0, r0, c13, c0, 0  ; clear PID
 112                 mcr     p15, 0, r0, c8, c7, 0   ; invalidate I+D TLB
 113                 mrc     p15, 0, r0, c2, c0, 0
 114                 mov     r0, r0
 115                 sub     pc, pc, #4
 116
 117 ;Set parameters for kernel
 118                 mov     r0, #0
 119                 mov     r1, r10
 120                 ldr     r2, [r2, #0]
 121                 mov     r2, #0
 122
 123 ; Jump into the kernel:
 124                 mov             pc, r11
 125
 126
 127 |$M221|
 128         ENDP  ; |?do_it@@YAXXZ|, do_it
 129         END
 130