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Prevent the msgbuf from getting trashed across reboots by moving avail_end 

back one page.
This commit is contained in:
thorpej 1995-12-09 07:54:19 +00:00
parent 3a0fa6f8ee
commit b1c7779d0a
1 changed files with 12 additions and 5 deletions
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17
sys/arch/hp300/hp300/pmap_bootstrap.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: pmap_bootstrap.c,v 1.7 1995/10/05 06:54:12 thorpej Exp $ */
/* $NetBSD: pmap_bootstrap.c,v 1.8 1995/12/09 07:54:19 thorpej Exp $ */
/*
* Copyright (c) 1991, 1993
@ -410,12 +410,19 @@ pmap_bootstrap(nextpa, firstpa)
/*
* VM data structures are now initialized, set up data for
* the pmap module.
*
* Note about avail_end: msgbuf is initialized just after
* avail_end in machdep.c. Since the last page is used
* for rebooting the system (code is copied there and
* excution continues from copied code before the MMU
* is disabled), the msgbuf will get trounced between
* reboots if it's placed in the last physical page.
* To work around this, we move avail_end back one more
* page so the msgbuf can be preserved.
*/
RELOC(avail_start, vm_offset_t) = nextpa;
RELOC(avail_end, vm_offset_t) =
hp300_ptob(RELOC(maxmem, int))
/* XXX allow for msgbuf */
- hp300_round_page(sizeof(struct msgbuf));
RELOC(avail_end, vm_offset_t) = hp300_ptob(RELOC(maxmem, int)) -
(hp300_round_page(sizeof(struct msgbuf)) + hp300_ptob(1));
RELOC(mem_size, vm_size_t) = hp300_ptob(RELOC(physmem, int));
RELOC(virtual_avail, vm_offset_t) =
VM_MIN_KERNEL_ADDRESS + (nextpa - firstpa);