diff options
| author | Miod Vallat <miod@cvs.openbsd.org> | 2004-11-27 14:26:33 +0000 |
|---|---|---|
| committer | Miod Vallat <miod@cvs.openbsd.org> | 2004-11-27 14:26:33 +0000 |
| commit | ffaaa05b0a39cb5292abb8e72796ae8d11649cad (patch) | |
| tree | 20d401430c7d452048d0da7f6aa02b8eada26952 /sys/arch/m68k | |
| parent | 0290d1a059c8f3bddcc05459e4cc70c0968e620b (diff) | |
In pmap_bootstrap(), replace PMAP_MD_RWZERO, which would leave the lowest
page writeable, with PMAP_MD_RWLOW, which tells how many pages have to be
left writeable on low addresses, since the mac rom needs more than one.
This lets non-DDB mac68k kernels run.
No change on non-mac68k platforms.
Diffstat (limited to 'sys/arch/m68k')
| -rw-r--r-- | sys/arch/m68k/m68k/pmap_bootstrap.c | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/sys/arch/m68k/m68k/pmap_bootstrap.c b/sys/arch/m68k/m68k/pmap_bootstrap.c index 809aaebcfcd..5b5ce76369e 100644 --- a/sys/arch/m68k/m68k/pmap_bootstrap.c +++ b/sys/arch/m68k/m68k/pmap_bootstrap.c @@ -1,4 +1,4 @@ -/* $OpenBSD: pmap_bootstrap.c,v 1.7 2004/07/22 19:37:39 miod Exp $ */ +/* $OpenBSD: pmap_bootstrap.c,v 1.8 2004/11/27 14:26:30 miod Exp $ */ /* * Copyright (c) 1995 Theo de Raadt @@ -74,7 +74,7 @@ * PMAP_MD_RELOC3() general purpose kernel virtual addresses relocation * PMAP_MD_MAPIOSPACE() setup machine-specific internal iospace components * PMAP_MD_MEMSIZE() compute avail_end - * PMAP_MD_RWZERO define to NOT make virtual address 0 read only + * PMAP_MD_RWLOW number of pages to keep writeable, starting at address 0 */ extern char *etext; @@ -348,23 +348,24 @@ pmap_bootstrap(nextpa, firstpa) */ pte = &(PA2VA(kptpa, u_int *))[m68k_btop(KERNBASE)]; epte = &pte[m68k_btop(trunc_page((vaddr_t)&etext))]; -#ifndef PMAP_MD_RWZERO - *pte++ = firstpa | PG_NV; /* make *NULL fail in the kernel */ -#if defined(KGDB) || defined(DDB) - protopte = (firstpa + NBPG) | PG_RW | PG_V | PG_U; /* XXX RW for now */ -#else - protopte = (firstpa + NBPG) | PG_RO | PG_V | PG_U; -#endif -#else + #if defined(KGDB) || defined(DDB) protopte = firstpa | PG_RW | PG_V | PG_U; /* XXX RW for now */ #else protopte = firstpa | PG_RO | PG_V | PG_U; #endif +#ifdef PMAP_MD_RWLOW + for (num = PMAP_MD_RWLOW; num != 0; num--) { + *pte++ = (protopte & ~PG_RO) | PG_RW; + protopte += PAGE_SIZE; + } +#else + *pte++ = PG_NV; /* make *NULL fail in the kernel */ + protopte += PAGE_SIZE; #endif while (pte < epte) { *pte++ = protopte; - protopte += NBPG; + protopte += PAGE_SIZE; } /* * Validate PTEs for kernel data/bss, dynamic data allocated |