src/Unix/vm_alloc.h

/*
 *  vm_alloc.h - Wrapper to various virtual memory allocation schemes
 *               (supports mmap, vm_allocate or fallbacks to malloc)
 *
 *  Basilisk II (C) 1997-2004 Christian Bauer
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

// TODO: Win32 VM ?
#ifndef VM_ALLOC_H
#define VM_ALLOC_H

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#ifdef HAVE_MACH_VM
extern "C" {
#include <mach/mach.h>
}
#endif

/* Return value of `vm_acquire' in case of an error.  */
#ifdef HAVE_MACH_VM
#define VM_MAP_FAILED                   ((void *)-1)
#else
#ifdef HAVE_MMAP_VM
#define VM_MAP_FAILED                   ((void *)-1)
#else
#define VM_MAP_FAILED                   0
#endif
#endif

/* Mapping options.  */
#define VM_MAP_SHARED                   0x01
#define VM_MAP_PRIVATE                  0x02
#define VM_MAP_FIXED                    0x04
#define VM_MAP_32BIT                    0x08
#define VM_MAP_33BIT                    0x10

/* Default mapping options.  */
#define VM_MAP_DEFAULT                  (VM_MAP_PRIVATE)

/* Protection bits.  */
#ifdef HAVE_MACH_VM
#define VM_PAGE_NOACCESS                VM_PROT_NONE
#define VM_PAGE_READ                    VM_PROT_READ
#define VM_PAGE_WRITE                   VM_PROT_WRITE
#define VM_PAGE_EXECUTE                 VM_PROT_EXECUTE
#else
#ifdef HAVE_MMAP_VM
#define VM_PAGE_NOACCESS                PROT_NONE
#define VM_PAGE_READ                    PROT_READ
#define VM_PAGE_WRITE                   PROT_WRITE
#define VM_PAGE_EXECUTE                 PROT_EXEC
#else
#define VM_PAGE_NOACCESS                0x0
#define VM_PAGE_READ                    0x1
#define VM_PAGE_WRITE                   0x2
#define VM_PAGE_EXECUTE                 0x4
#endif
#endif

/* Default protection bits.  */
#define VM_PAGE_DEFAULT                 (VM_PAGE_READ | VM_PAGE_WRITE)

/* Initialize the VM system. Returns 0 if successful, -1 for errors.  */

extern int vm_init(void);

/* Deallocate all internal data used to wrap virtual memory allocators.  */

extern void vm_exit(void);

/* Allocate zero-filled memory of SIZE bytes. The mapping is private
   and default protection bits are read / write. The return value
   is the actual mapping address chosen or VM_MAP_FAILED for errors.  */

extern void * vm_acquire(size_t size, int options = VM_MAP_DEFAULT);

/* Allocate zero-filled memory at exactly ADDR (which must be page-aligned).
   Returns 0 if successful, -1 on errors.  */

extern int vm_acquire_fixed(void * addr, size_t size, int options = VM_MAP_DEFAULT);

/* Deallocate any mapping for the region starting at ADDR and extending
   LEN bytes. Returns 0 if successful, -1 on errors.  */

extern int vm_release(void * addr, size_t size);

/* Change the memory protection of the region starting at ADDR and
   extending LEN bytes to PROT. Returns 0 if successful, -1 for errors.  */

extern int vm_protect(void * addr, size_t size, int prot);

#endif /* VM_ALLOC_H */
Revision:	1.7
Committed:	2004-11-08T21:07:07Z (20 years ago) by gbeauche
Content type:	text/plain
Branch:	MAIN
Changes since 1.6:	+1 -0 lines
Log Message:	Enable 33-bit memory addressing on 64-bit JIT capable platforms (e.g. x86-64). This is useful to get rid of address offset sign extensions. It uses POSIX shared memory to create aliased regions, fallback to usual sign-extension way if shm_open et al. don't work (e.g. no /dev/shm mounted)
#	User	Rev	Content
1	gbeauche	1.1	/*
2			* vm_alloc.h - Wrapper to various virtual memory allocation schemes
3			* (supports mmap, vm_allocate or fallbacks to malloc)
4			*
5	cebix	1.6	* Basilisk II (C) 1997-2004 Christian Bauer
6	gbeauche	1.1	*
7			* This program is free software; you can redistribute it and/or modify
8			* it under the terms of the GNU General Public License as published by
9			* the Free Software Foundation; either version 2 of the License, or
10			* (at your option) any later version.
11			*
12			* This program is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			* GNU General Public License for more details.
16			*
17			* You should have received a copy of the GNU General Public License
18			* along with this program; if not, write to the Free Software
19			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20			*/
21
22			// TODO: Win32 VM ?
23			#ifndef VM_ALLOC_H
24			#define VM_ALLOC_H
25
26			#ifdef HAVE_UNISTD_H
27			#include <unistd.h>
28	gbeauche	1.3	#include <sys/types.h>
29	gbeauche	1.1	#endif
30			#ifdef HAVE_SYS_MMAN_H
31			#include <sys/mman.h>
32			#endif
33	gbeauche	1.4	#ifdef HAVE_MACH_VM
34			extern "C" {
35			#include <mach/mach.h>
36			}
37			#endif
38	gbeauche	1.1
39			/* Return value of `vm_acquire' in case of an error. */
40			#ifdef HAVE_MACH_VM
41			#define VM_MAP_FAILED ((void *)-1)
42			#else
43			#ifdef HAVE_MMAP_VM
44			#define VM_MAP_FAILED ((void *)-1)
45			#else
46			#define VM_MAP_FAILED 0
47			#endif
48			#endif
49
50	gbeauche	1.5	/* Mapping options. */
51			#define VM_MAP_SHARED 0x01
52			#define VM_MAP_PRIVATE 0x02
53			#define VM_MAP_FIXED 0x04
54			#define VM_MAP_32BIT 0x08
55	gbeauche	1.7	#define VM_MAP_33BIT 0x10
56	gbeauche	1.5
57			/* Default mapping options. */
58			#define VM_MAP_DEFAULT (VM_MAP_PRIVATE)
59
60	gbeauche	1.1	/* Protection bits. */
61			#ifdef HAVE_MACH_VM
62			#define VM_PAGE_NOACCESS VM_PROT_NONE
63			#define VM_PAGE_READ VM_PROT_READ
64			#define VM_PAGE_WRITE VM_PROT_WRITE
65			#define VM_PAGE_EXECUTE VM_PROT_EXECUTE
66			#else
67			#ifdef HAVE_MMAP_VM
68			#define VM_PAGE_NOACCESS PROT_NONE
69			#define VM_PAGE_READ PROT_READ
70			#define VM_PAGE_WRITE PROT_WRITE
71			#define VM_PAGE_EXECUTE PROT_EXEC
72			#else
73			#define VM_PAGE_NOACCESS 0x0
74			#define VM_PAGE_READ 0x1
75			#define VM_PAGE_WRITE 0x2
76			#define VM_PAGE_EXECUTE 0x4
77			#endif
78			#endif
79
80			/* Default protection bits. */
81			#define VM_PAGE_DEFAULT (VM_PAGE_READ \| VM_PAGE_WRITE)
82
83			/* Initialize the VM system. Returns 0 if successful, -1 for errors. */
84
85			extern int vm_init(void);
86
87			/* Deallocate all internal data used to wrap virtual memory allocators. */
88
89			extern void vm_exit(void);
90
91			/* Allocate zero-filled memory of SIZE bytes. The mapping is private
92			and default protection bits are read / write. The return value
93			is the actual mapping address chosen or VM_MAP_FAILED for errors. */
94
95	gbeauche	1.5	extern void * vm_acquire(size_t size, int options = VM_MAP_DEFAULT);
96	gbeauche	1.1
97			/* Allocate zero-filled memory at exactly ADDR (which must be page-aligned).
98			Returns 0 if successful, -1 on errors. */
99
100	gbeauche	1.5	extern int vm_acquire_fixed(void * addr, size_t size, int options = VM_MAP_DEFAULT);
101	gbeauche	1.1
102			/* Deallocate any mapping for the region starting at ADDR and extending
103			LEN bytes. Returns 0 if successful, -1 on errors. */
104
105			extern int vm_release(void * addr, size_t size);
106
107			/* Change the memory protection of the region starting at ADDR and
108			extending LEN bytes to PROT. Returns 0 if successful, -1 for errors. */
109
110			extern int vm_protect(void * addr, size_t size, int prot);
111
112			#endif /* VM_ALLOC_H */