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Implement switch to have a sparse memory file or to fill it beforehand.

This commit is contained in:
reinoud 2011-09-06 09:37:41 +00:00
parent 9fdc69723e
commit b2edc06421
1 changed files with 31 additions and 7 deletions
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38
sys/arch/usermode/usermode/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.56 2011/09/06 08:44:39 reinoud Exp $ */
/* $NetBSD: pmap.c,v 1.57 2011/09/06 09:37:41 reinoud Exp $ */
/*-
* Copyright (c) 2011 Reinoud Zandijk <reinoud@NetBSD.org>
@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.56 2011/09/06 08:44:39 reinoud Exp $");
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.57 2011/09/06 09:37:41 reinoud Exp $");
#include "opt_memsize.h"
#include "opt_kmempages.h"
@ -104,6 +104,8 @@ vaddr_t kmem_ext_start, kmem_ext_end;
vaddr_t kmem_user_start, kmem_user_end;
vaddr_t kmem_ext_cur_start, kmem_ext_cur_end;
#define SPARSE_MEMFILE
void
pmap_bootstrap(void)
{
@ -119,7 +121,6 @@ pmap_bootstrap(void)
vaddr_t va;
uintptr_t pg;
void *addr;
char dummy;
int err;
extern void _init(void); /* start of kernel */
@ -188,7 +189,7 @@ pmap_bootstrap(void)
aprint_debug("\tkmem_ext_end\t%p\n", (void *) kmem_ext_end);
aprint_debug("\tkmem_user_start\t%p\n", (void *) kmem_user_start);
aprint_debug("\tkmem_user_end\t%p\n", (void *) kmem_user_end);
aprint_debug("\n\n\n");
aprint_debug("\n\n");
aprint_debug("Creating memory mapped backend\n");
@ -203,9 +204,32 @@ pmap_bootstrap(void)
/* file_len is the backing store length, nothing to do with placement */
file_len = 1024 * MEMSIZE;
wlen = thunk_pwrite(mem_fh, &dummy, 1, file_len - 1);
if (wlen != 1)
panic("pmap_bootstrap: can't grow file\n");
#ifdef SPARSE_MEMFILE
{
char dummy;
wlen = thunk_pwrite(mem_fh, &dummy, 1, file_len - 1);
if (wlen != 1)
panic("pmap_bootstrap: can't grow file\n");
}
#else
{
void *block;
printf("Creating memory file\r");
block = thunk_malloc(PAGE_SIZE);
if (!block)
panic("pmap_bootstrap: can't malloc writeout block");
for (pg = 0; pg < file_len; pg += PAGE_SIZE) {
wlen = thunk_pwrite(mem_fh, block, PAGE_SIZE, pg);
if (wlen != PAGE_SIZE)
panic("pmap_bootstrap: write fails, disc full?");
}
thunk_free(block);
}
#endif
/* protect the current kernel section */
/* XXX kernel stack? */