reactos/boot/freeldr/bootsect/ofwboot.s

   1         .section .text
   2
   3 _start:
   4         .long   0xe00000 + 12
   5         .long   0
   6         .long   0
   7
   8         .globl _begin
   9 _begin:
  10         sync
  11         isync
  12
  13         lis     %r1,stack@ha
  14         addi    %r1,%r1,stack@l
  15         addi    %r1,%r1,16384 - 0x10
  16
  17         /* Store ofw call addr */
  18         mr      %r21,%r5
  19         lis     %r10,0xe00000@ha
  20         stw     %r5,ofw_call_addr - _start@l(%r10)
  21
  22         lis     %r3,0xe00000@ha
  23         addi    %r3,%r3,freeldr_banner - _start
  24
  25         bl      ofw_print_string
  26
  27         bl      ofw_print_eol
  28
  29         /* Claim enough bytes to place freeldr at 0x8000 */
  30         lis     %r3,0x8000@ha
  31         addi    %r3,%r3,0x8000@l
  32
  33         lis     %r4,_binary_freeldr_tmp_end@ha
  34         addi    %r4,%r4,_binary_freeldr_tmp_end@l
  35         lis     %r5,_binary_freeldr_tmp_start@ha
  36         addi    %r5,%r5,_binary_freeldr_tmp_start@l
  37         /* Make sufficient room for .bss */
  38         sub     %r4,%r4,%r5
  39         addi    %r4,%r4,0x6000
  40
  41         xor     %r5,%r5,%r5
  42         li      %r5,0x1000
  43
  44         bl      ofw_claim
  45
  46         lis     %r4,_binary_freeldr_tmp_end@ha
  47         addi    %r4,%r4,_binary_freeldr_tmp_end@l
  48         lis     %r3,_binary_freeldr_tmp_start@ha
  49         addi    %r3,%r3,_binary_freeldr_tmp_start@l
  50
  51         lis     %r5,0x8000@ha
  52         addi    %r5,%r5,0x8000@l
  53
  54         bl      ofw_dumpregs
  55         bl      copy_bits
  56         bl      zero_registers
  57
  58         /* Zero CTR */
  59         mtcr    %r31
  60
  61         lis     %r3,0x8000@ha
  62         addi    %r3,%r3,0x8000@l
  63
  64         mtlr    %r3
  65
  66         lis     %r3,call_ofw@ha
  67         addi    %r3,%r3,call_ofw - _start
  68
  69         b       call_freeldr
  70
  71 zero_registers:
  72         xor     %r2,%r2,%r2
  73         mr      %r0,%r2
  74         mr      %r3,%r2
  75
  76         mr      %r4,%r2
  77         mr      %r5,%r2
  78         mr      %r6,%r2
  79         mr      %r7,%r2
  80
  81         mr      %r8,%r2
  82         mr      %r9,%r2
  83         mr      %r10,%r2
  84         mr      %r11,%r2
  85
  86         mr      %r12,%r2
  87         mr      %r13,%r2
  88         mr      %r14,%r2
  89         mr      %r15,%r2
  90
  91         mr      %r12,%r2
  92         mr      %r13,%r2
  93         mr      %r14,%r2
  94         mr      %r15,%r2
  95
  96         mr      %r16,%r2
  97         mr      %r17,%r2
  98         mr      %r18,%r2
  99         mr      %r19,%r2
 100
 101         mr      %r20,%r2
 102         mr      %r21,%r2
 103         mr      %r22,%r2
 104         mr      %r23,%r2
 105
 106         mr      %r24,%r2
 107         mr      %r25,%r2
 108         mr      %r26,%r2
 109         mr      %r27,%r2
 110
 111         mr      %r28,%r2
 112         mr      %r29,%r2
 113         mr      %r30,%r2
 114         mr      %r31,%r2
 115
 116         blr
 117
 118         .org    0x1000
 119 freeldr_banner:
 120         .ascii  "ReactOS OpenFirmware Boot Program\r\n\0"
 121
 122 freeldr_halt:
 123         .ascii  "ReactOS OpenFirmware Boot Program Halting\r\n\0"
 124
 125 ofw_memory_size:
 126         .long   0
 127         .long   0
 128         .long   0
 129         .long   0
 130
 131         .org    0x2000
 132 stack:
 133         .space  0x4000
 134