arch/sparc64/prom/map.S

   1 /* $Id: map.S,v 1.2 1999/11/19 05:53:02 davem Exp $
   2  * map.S: Tricky coding required to fixup the kernel OBP maps
   3  *        properly.
   4  *
   5  * Copyright (C) 1999 David S. Miller (davem@redhat.com)
   6  */
   7
   8         .text
   9         .align  8192
  10         .globl  prom_boot_page
  11 prom_boot_page:
  12 call_method:
  13         .asciz  "call-method"
  14         .align  8
  15 map:
  16         .asciz  "map"
  17         .align  8
  18
  19         /* When we are invoked, our caller has remapped us to
  20          * page zero, therefore we must use PC relative addressing
  21          * for everything after we begin performing the unmap/map
  22          * calls.
  23          */
  24         .globl  prom_remap
  25 prom_remap:     /* %o0 = physpage, %o1 = virtpage, %o2 = mmu_ihandle */
  26         rd      %pc, %g1
  27         srl     %o2, 0, %o2                     ! kill sign extension
  28         sethi   %hi(p1275buf), %g2
  29         or      %g2, %lo(p1275buf), %g2
  30         ldx     [%g2 + 0x10], %g3               ! prom_cif_stack
  31         save    %g3, -(192 + 128), %sp
  32         ldx     [%g2 + 0x08], %l0               ! prom_cif_handler
  33         mov     %g6, %i3
  34         mov     %g4, %i4
  35         mov     %g5, %i5
  36         flushw
  37
  38         sethi   %hi(prom_remap - call_method), %g7
  39         or      %g7, %lo(prom_remap - call_method), %g7
  40         sub     %g1, %g7, %l2                   ! call-method string
  41         sethi   %hi(prom_remap - map), %g7
  42         or      %g7, %lo(prom_remap - map), %g7
  43         sub     %g1, %g7, %l4                   ! map string
  44
  45         /* OK, map the 4MB region we really live at. */
  46         stx     %l2, [%sp + 2047 + 128 + 0x00]  ! call-method
  47         mov     7, %l5
  48         stx     %l5, [%sp + 2047 + 128 + 0x08]  ! num_args
  49         mov     1, %l5
  50         stx     %l5, [%sp + 2047 + 128 + 0x10]  ! num_rets
  51         stx     %l4, [%sp + 2047 + 128 + 0x18]  ! map
  52         stx     %i2, [%sp + 2047 + 128 + 0x20]  ! mmu_ihandle
  53         mov     -1, %l5
  54         stx     %l5, [%sp + 2047 + 128 + 0x28]  ! mode == default
  55         sethi   %hi(4 * 1024 * 1024), %l5
  56         stx     %l5, [%sp + 2047 + 128 + 0x30]  ! size
  57         stx     %i1, [%sp + 2047 + 128 + 0x38]  ! vaddr
  58         stx     %g0, [%sp + 2047 + 128 + 0x40]  ! filler
  59         stx     %i0, [%sp + 2047 + 128 + 0x48]  ! paddr
  60         call    %l0
  61          add    %sp, (2047 + 128), %o0          ! argument array
  62
  63         /* Restore hard-coded globals. */
  64         mov     %i3, %g6
  65         mov     %i4, %g4
  66         mov     %i5, %g5
  67
  68         /* Wheee.... we are done. */
  69         ret
  70         restore
  71
  72         .align  8192