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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 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 /* Wheee.... we are done. */ ret restore .align 8192 |