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Reserve the DOS area in mmap_init if it wasn't already done by the 

preloader.
This commit is contained in:
Alexandre Julliard 2004-07-24 02:30:09 +00:00
parent 42f1c4818c
commit d0e5b8e2ee
1 changed files with 38 additions and 2 deletions
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40
libs/wine/mmap.c
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@ -189,7 +189,7 @@ void *wine_anon_mmap( void *start, size_t size, int prot, int flags )
}
#if defined(__i386__) && defined(HAVE_MMAP)
#ifdef HAVE_MMAP
/***********************************************************************
* reserve_area
@ -222,6 +222,30 @@ static void reserve_area( void *addr, void *end )
}
/***********************************************************************
* reserve_dos_area
*
* Reserve the DOS area (0x00000000-0x00110000).
*/
static void reserve_dos_area(void)
{
const size_t page_size = getpagesize();
const size_t dos_area_size = 0x110000;
void *ptr;
/* first page has to be handled specially */
ptr = wine_anon_mmap( (void *)page_size, dos_area_size - page_size, PROT_NONE, MAP_NORESERVE );
if (ptr != (void *)page_size)
{
if (ptr != (void *)-1) munmap( ptr, dos_area_size - page_size );
return;
}
/* now add first page with MAP_FIXED */
wine_anon_mmap( NULL, page_size, PROT_NONE, MAP_NORESERVE|MAP_FIXED );
wine_mmap_add_reserved_area( NULL, dos_area_size );
}
/***********************************************************************
* mmap_init
*/
@ -229,6 +253,7 @@ void mmap_init(void)
{
struct reserved_area *area;
struct list *ptr;
#ifdef __i386__
char stack;
char * const stack_ptr = &stack;
char *user_space_limit = (char *)0x80000000;
@ -259,9 +284,20 @@ void mmap_init(void)
reserve_area( base, 0 );
}
else reserve_area( user_space_limit, 0 );
#endif /* __i386__ */
/* reserve the DOS area if not already done */
ptr = list_head( &reserved_areas );
if (ptr)
{
area = LIST_ENTRY( ptr, struct reserved_area, entry );
if (!area->base) return; /* already reserved */
}
reserve_dos_area();
}
#else /* __i386__ */
#else /* HAVE_MMAP */
void mmap_init(void)
{