| /* $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 |
