reactos/boot/freeldr/freeldr/arch/powerpc/boot.s

   1         .section ".text"
   2         .extern PpcInit
   3         .globl _start
   4         .globl call_ofw
   5 _start:
   6         sync
   7         isync
   8
   9         lis     %r1,stackend@ha
  10         addi    %r1,%r1,stackend@l
  11
  12         /* Store ofw call addr */
  13         mr      %r21,%r5
  14         lis     %r10,ofw_call_addr@ha
  15         stw     %r5,ofw_call_addr@l(%r10)
  16
  17         bl      zero_registers
  18
  19         /* Zero CTR */
  20         mtcr    %r31
  21
  22         lis     %r3,PpcInit@ha
  23         addi    %r3,%r3,PpcInit@l
  24         mtlr    %r3
  25
  26         /* Check for ofw */
  27         lis     %r3,ofw_call_addr@ha
  28         lwz     %r3,ofw_call_addr@l(%r3)
  29         cmpw    %r3,%r31 /* Zero? */
  30         mr      %r3,%r31
  31         beq     initfp
  32
  33         lis     %r3,call_ofw@ha
  34         addi    %r3,%r3,call_ofw@l
  35         b       bootme
  36
  37 initfp:
  38         /* Enabling FP at this point won't hurt, and the varargs scheme we're
  39          * using now requires it. */
  40         mfmsr   %r0
  41         ori     %r0,%r0,8192
  42         mtmsr   %r0
  43
  44 bootme:
  45         blr
  46
  47 zero_registers:
  48         xor     %r2,%r2,%r2
  49         mr      %r0,%r2
  50         mr      %r3,%r2
  51
  52         mr      %r4,%r2
  53         mr      %r5,%r2
  54         mr      %r6,%r2
  55         mr      %r7,%r2
  56
  57         mr      %r8,%r2
  58         mr      %r9,%r2
  59         mr      %r10,%r2
  60         mr      %r11,%r2
  61
  62         mr      %r12,%r2
  63         mr      %r13,%r2
  64         mr      %r14,%r2
  65         mr      %r15,%r2
  66
  67         mr      %r12,%r2
  68         mr      %r13,%r2
  69         mr      %r14,%r2
  70         mr      %r15,%r2
  71
  72         mr      %r16,%r2
  73         mr      %r17,%r2
  74         mr      %r18,%r2
  75         mr      %r19,%r2
  76
  77         mr      %r20,%r2
  78         mr      %r21,%r2
  79         mr      %r22,%r2
  80         mr      %r23,%r2
  81
  82         mr      %r24,%r2
  83         mr      %r25,%r2
  84         mr      %r26,%r2
  85         mr      %r27,%r2
  86
  87         mr      %r28,%r2
  88         mr      %r29,%r2
  89         mr      %r30,%r2
  90         mr      %r31,%r2
  91
  92         blr
  93
  94 ofw_memory_size:
  95         .long   0
  96         .long   0
  97         .long   0
  98         .long   0
  99
 100         .align  4
 101 stack:
 102         .space  0x4000
 103 stackend:
 104         .long   0,0,0,0
 105
 106         .globl _bss
 107         .section ".bss2"
 108 _bss:
 109         .long   0
 110
 111         .align  4