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         sub     %r4,%r4,%r5
  38
  39         xor     %r5,%r5,%r5
  40         li      %r5,0x1000
  41
  42         bl      ofw_claim
  43
  44         lis     %r4,_binary_freeldr_tmp_end@ha
  45         addi    %r4,%r4,_binary_freeldr_tmp_end@l
  46         lis     %r3,_binary_freeldr_tmp_start@ha
  47         addi    %r3,%r3,_binary_freeldr_tmp_start@l
  48
  49         lis     %r5,0x8000@ha
  50         addi    %r5,%r5,0x8000@l
  51
  52         bl      ofw_dumpregs
  53         bl      copy_bits
  54         bl      zero_registers
  55
  56         /* Zero CTR */
  57         mtcr    %r31
  58
  59         lis     %r3,0x8000@ha
  60         addi    %r3,%r3,0x8000@l
  61
  62         mtlr    %r3
  63
  64         lis     %r3,call_ofw@ha
  65         addi    %r3,%r3,call_ofw - _start
  66
  67         b       call_freeldr
  68
  69 zero_registers:
  70         xor     %r2,%r2,%r2
  71         mr      %r0,%r2
  72         mr      %r3,%r2
  73
  74         mr      %r4,%r2
  75         mr      %r5,%r2
  76         mr      %r6,%r2
  77         mr      %r7,%r2
  78
  79         mr      %r8,%r2
  80         mr      %r9,%r2
  81         mr      %r10,%r2
  82         mr      %r11,%r2
  83
  84         mr      %r12,%r2
  85         mr      %r13,%r2
  86         mr      %r14,%r2
  87         mr      %r15,%r2
  88
  89         mr      %r12,%r2
  90         mr      %r13,%r2
  91         mr      %r14,%r2
  92         mr      %r15,%r2
  93
  94         mr      %r16,%r2
  95         mr      %r17,%r2
  96         mr      %r18,%r2
  97         mr      %r19,%r2
  98
  99         mr      %r20,%r2
 100         mr      %r21,%r2
 101         mr      %r22,%r2
 102         mr      %r23,%r2
 103
 104         mr      %r24,%r2
 105         mr      %r25,%r2
 106         mr      %r26,%r2
 107         mr      %r27,%r2
 108
 109         mr      %r28,%r2
 110         mr      %r29,%r2
 111         mr      %r30,%r2
 112         mr      %r31,%r2
 113
 114         blr
 115
 116         .org    0x1000
 117 freeldr_banner:
 118         .ascii  "ReactOS OpenFirmware Boot Program\r\n\0"
 119
 120 freeldr_halt:
 121         .ascii  "ReactOS OpenFirmware Boot Program Halting\r\n\0"
 122
 123 ofw_memory_size:
 124         .long   0
 125         .long   0
 126         .long   0
 127         .long   0
 128
 129         .org    0x2000
 130 stack:
 131         .space  0x4000
 132