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Compute page size related parameters at run-time.

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This commit is contained in:
thorpej 1999-07-05 21:49:05 +00:00
parent 057479d6da
commit 3cedf1e346
1 changed files with 17 additions and 25 deletions
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42
lib/libc/stdlib/malloc.c
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@ -1,4 +1,4 @@
/* $NetBSD: malloc.c,v 1.19 1999/07/05 21:08:38 thorpej Exp $ */
/* $NetBSD: malloc.c,v 1.20 1999/07/05 21:49:05 thorpej Exp $ */
/*
* ----------------------------------------------------------------------------
@ -32,10 +32,6 @@
/*
* The basic parameters you can tweak.
*
* malloc_pageshift pagesize = 1 << malloc_pageshift
* It's probably best if this is the native
* page size, but it doesn't have to be.
*
* malloc_minsize minimum size of an allocation in bytes.
* If this is too small it's too much work
* to manage them. This is also the smallest
@ -46,11 +42,9 @@
#if defined(__FreeBSD__)
# if defined(__i386__)
# define malloc_pageshift 12U
# define malloc_minsize 16U
# endif
# if defined(__alpha__)
# define malloc_pageshift 13U
# define malloc_minsize 16U
# endif
# if !defined(__NETBSD_SYSCALLS)
@ -68,13 +62,10 @@
#endif /* __FreeBSD__ */
#if defined(__NetBSD__)
# include <sys/param.h>
# define malloc_pageshift PGSHIFT
# define malloc_minsize 16U
#endif /* __NetBSD__ */
#if defined(__sparc__) && defined(sun)
# define malloc_pageshift 12U
# define malloc_minsize 16U
# define MAP_ANON (0)
static int fdzero;
@ -86,7 +77,6 @@
/* Insert your combination here... */
#if defined(__FOOCPU__) && defined(__BAROS__)
# define malloc_pageshift 12U
# define malloc_minsize 16U
#endif /* __FOOCPU__ && __BAROS__ */
@ -145,29 +135,21 @@ struct pgfree {
#define MALLOC_FOLLOW ((struct pginfo*) 3)
#define MALLOC_MAGIC ((struct pginfo*) 4)
#ifndef malloc_pageshift
#define malloc_pageshift 12U
#endif
/*
* Page size related parameters, computed at run-time.
*/
static size_t malloc_pagesize;
static size_t malloc_pageshift;
static size_t malloc_pagemask;
#ifndef malloc_minsize
#define malloc_minsize 16U
#endif
#if !defined(malloc_pagesize)
#define malloc_pagesize (1UL<<malloc_pageshift)
#endif
#if ((1<<malloc_pageshift) != malloc_pagesize)
#error "(1<<malloc_pageshift) != malloc_pagesize"
#endif
#ifndef malloc_maxsize
#define malloc_maxsize ((malloc_pagesize)>>1)
#endif
/* A mask for the offset inside a page. */
#define malloc_pagemask ((malloc_pagesize)-1)
#define pageround(foo) (((foo) + (malloc_pagemask))&(~(malloc_pagemask)))
#define ptr2index(foo) (((u_long)(foo) >> malloc_pageshift)-malloc_origo)
@ -397,6 +379,16 @@ malloc_init (void)
int i, j;
int errnosave;
/*
* Compute page-size related variables.
*/
malloc_pagesize = sysconf(_SC_PAGESIZE);
malloc_pagemask = malloc_pagesize - 1;
for (malloc_pageshift = 0;
(1UL << malloc_pageshift) != malloc_pagesize;
malloc_pageshift++)
/* nothing */ ;
INIT_MMAP();
#ifdef MALLOC_EXTRA_SANITY