reactos/boot/freeldr/bootsect/ofw_tests/ofwtest.s

   1         .section .text
   2
   3 _start:
   4         .long   0xe00000 + 12
   5         .long   0
   6         .long   0
   7
   8         .globl ofw_functions_addr
   9         .globl ofw_dumpregs
  10
  11 ofw_functions_addr:
  12         .long   ofw_functions
  13
  14         .globl _begin
  15 _begin:
  16         sync
  17         isync
  18
  19         lis     %r1,stack@ha
  20         addi    %r1,%r1,stack@l
  21         addi    %r1,%r1,16384 - 0x10
  22
  23         /* Store ofw call addr */
  24         mr      %r21,%r5
  25         lis     %r8,_start@ha
  26         addi    %r7,%r8,ofw_call_addr - _start
  27         stw     %r21,0(%r7)
  28
  29         bl      ofw_dumpregs
  30
  31 foo:
  32         b       foo
  33
  34         .align  4
  35 call_freeldr:
  36         /* Get the address of the functions list --
  37          * Note:
  38          * Because of little endian switch we must use an even number of
  39          * instructions here..  Pad with a nop if needed. */
  40         mfmsr   %r10
  41         ori     %r10,%r10,1
  42         mtmsr   %r10
  43
  44         nop
  45
  46         /* Note that this is little-endian from here on */
  47         blr
  48         nop
  49
  50         .align  4
  51
  52 call_ofw:
  53         /* R3 has the function offset to call (n * 4)
  54          * Other arg registers are unchanged.
  55          * Note that these 4 instructions are in reverse order due to
  56          * little-endian convention */
  57         andi.   %r0,%r0,65534
  58         mfmsr   %r0
  59         mtmsr   %r0
  60         /* Now normal ordering resumes */
  61         subi    %r1,%r1,0x100
  62
  63         stw     %r8,4(%r1)
  64         stw     %r9,8(%r1)
  65         stw     %r10,12(%r1)
  66         mflr    %r8
  67         stw     %r8,16(%r1)
  68
  69         lis     %r10,0xe00000@ha
  70         add     %r9,%r3,%r10
  71         lwz     %r3,ofw_functions_addr - _start@l(%r9)
  72         lwz     %r3,0(%r3)
  73         mtctr   %r3
  74
  75         mr      %r3,%r4
  76         mr      %r4,%r5
  77         mr      %r5,%r6
  78         mr      %r6,%r7
  79         mr      %r7,%r8
  80
  81         /* Goto the swapped function */
  82         bctrl
  83
  84         lwz     %r8,16(%r1)
  85         mtlr    %r8
  86
  87         lwz     %r8,4(%r1)
  88         lwz     %r9,8(%r1)
  89         lwz     %r10,12(%r1)
  90
  91         addi    %r1,%r1,0x100
  92         /* Ok, go back to little endian */
  93         mfmsr   %r0
  94         ori     %r0,%r0,1
  95         mtmsr   %r0
  96
  97         /* Note that this is little-endian from here on */
  98         blr
  99         nop
 100
 101 zero_registers:
 102         xor     %r2,%r2,%r2
 103         mr      %r0,%r2
 104         mr      %r3,%r2
 105
 106         mr      %r4,%r2
 107         mr      %r5,%r2
 108         mr      %r6,%r2
 109         mr      %r7,%r2
 110
 111         mr      %r8,%r2
 112         mr      %r9,%r2
 113         mr      %r10,%r2
 114         mr      %r11,%r2
 115
 116         mr      %r12,%r2
 117         mr      %r13,%r2
 118         mr      %r14,%r2
 119         mr      %r15,%r2
 120
 121         mr      %r12,%r2
 122         mr      %r13,%r2
 123         mr      %r14,%r2
 124         mr      %r15,%r2
 125
 126         mr      %r16,%r2
 127         mr      %r17,%r2
 128         mr      %r18,%r2
 129         mr      %r19,%r2
 130
 131         mr      %r20,%r2
 132         mr      %r21,%r2
 133         mr      %r22,%r2
 134         mr      %r23,%r2
 135
 136         mr      %r24,%r2
 137         mr      %r25,%r2
 138         mr      %r26,%r2
 139         mr      %r27,%r2
 140
 141         mr      %r28,%r2
 142         mr      %r29,%r2
 143         mr      %r30,%r2
 144         mr      %r31,%r2
 145
 146         blr
 147
 148         .org    0x1000
 149 freeldr_banner:
 150         .ascii  "ReactOS OpenFirmware Boot Program\r\n\0"
 151
 152 freeldr_halt:
 153         .ascii  "ReactOS OpenFirmware Boot Program Halting\r\n\0"
 154
 155 freeldr_reg_init:
 156         .ascii  "r\0"
 157 freeldr_reg_lr:
 158         .ascii  "lr \0"
 159 freeldr_reg_cr:
 160         .ascii  "cr \0"
 161 freeldr_reg_ctr:
 162         .ascii  "ctr\0"
 163 freeldr_reg_msr:
 164         .ascii  "msr\0"
 165
 166 ofw_memory_size:
 167         .long   0
 168         .long   0
 169         .long   0
 170         .long   0
 171
 172 ofw_chosen_name:
 173         .ascii  "/chosen\0"
 174
 175 ofw_stdout_name:
 176         .ascii  "stdout\0"
 177
 178 ofw_memory_name:
 179         .ascii  "/memory@0\0"
 180
 181 ofw_reg_name:
 182         .ascii  "reg\0"
 183
 184         .org    0x2000
 185 stack:
 186         .space  0x4000
 187