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/* $Id: map.S,v 1.2 1999/11/19 05:53:02 davem Exp $
* map.S: Tricky coding required to fixup the kernel OBP maps
* properly.
*
* Copyright (C) 1999 David S. Miller (davem@redhat.com)
*/
.text
.align 8192
.globl prom_boot_page
prom_boot_page:
call_method:
.asciz "call-method"
.align 8
map:
.asciz "map"
.align 8
/* When we are invoked, our caller has remapped us to
* page zero, therefore we must use PC relative addressing
* for everything after we begin performing the unmap/map
* calls.
*/
.globl prom_remap
prom_remap: /* %o0 = physpage, %o1 = virtpage, %o2 = mmu_ihandle */
rd %pc, %g1
srl %o2, 0, %o2 ! kill sign extension
sethi %hi(p1275buf), %g2
or %g2, %lo(p1275buf), %g2
ldx [%g2 + 0x10], %g3 ! prom_cif_stack
save %g3, -(192 + 128), %sp
ldx [%g2 + 0x08], %l0 ! prom_cif_handler
mov %g6, %i3
mov %g4, %i4
mov %g5, %i5
flushw
sethi %hi(prom_remap - call_method), %g7
or %g7, %lo(prom_remap - call_method), %g7
sub %g1, %g7, %l2 ! call-method string
sethi %hi(prom_remap - map), %g7
or %g7, %lo(prom_remap - map), %g7
sub %g1, %g7, %l4 ! map string
/* OK, map the 4MB region we really live at. */
stx %l2, [%sp + 2047 + 128 + 0x00] ! call-method
mov 7, %l5
stx %l5, [%sp + 2047 + 128 + 0x08] ! num_args
mov 1, %l5
stx %l5, [%sp + 2047 + 128 + 0x10] ! num_rets
stx %l4, [%sp + 2047 + 128 + 0x18] ! map
stx %i2, [%sp + 2047 + 128 + 0x20] ! mmu_ihandle
mov -1, %l5
stx %l5, [%sp + 2047 + 128 + 0x28] ! mode == default
sethi %hi(4 * 1024 * 1024), %l5
stx %l5, [%sp + 2047 + 128 + 0x30] ! size
stx %i1, [%sp + 2047 + 128 + 0x38] ! vaddr
stx %g0, [%sp + 2047 + 128 + 0x40] ! filler
stx %i0, [%sp + 2047 + 128 + 0x48] ! paddr
call %l0
add %sp, (2047 + 128), %o0 ! argument array
/* Restore hard-coded globals. */
mov %i3, %g6
mov %i4, %g4
mov %i5, %g5
/* Wheee.... we are done. */
ret
restore
.align 8192
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