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gbeauche |
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/* |
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* vm_alloc.h - Wrapper to various virtual memory allocation schemes |
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* (supports mmap, vm_allocate or fallbacks to malloc) |
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* |
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* Basilisk II (C) 1997-2001 Christian Bauer |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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// TODO: Win32 VM ? |
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#ifndef VM_ALLOC_H |
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#define VM_ALLOC_H |
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#ifdef HAVE_UNISTD_H |
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#include <unistd.h> |
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#endif |
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#ifdef HAVE_SYS_MMAN_H |
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#include <sys/mman.h> |
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#endif |
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/* Return value of `vm_acquire' in case of an error. */ |
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#ifdef HAVE_MACH_VM |
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#define VM_MAP_FAILED ((void *)-1) |
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#else |
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#ifdef HAVE_MMAP_VM |
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#define VM_MAP_FAILED ((void *)-1) |
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#else |
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#define VM_MAP_FAILED 0 |
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#endif |
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#endif |
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/* Protection bits. */ |
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#ifdef HAVE_MACH_VM |
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#define VM_PAGE_NOACCESS VM_PROT_NONE |
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#define VM_PAGE_READ VM_PROT_READ |
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#define VM_PAGE_WRITE VM_PROT_WRITE |
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#define VM_PAGE_EXECUTE VM_PROT_EXECUTE |
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#else |
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#ifdef HAVE_MMAP_VM |
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#define VM_PAGE_NOACCESS PROT_NONE |
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#define VM_PAGE_READ PROT_READ |
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#define VM_PAGE_WRITE PROT_WRITE |
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#define VM_PAGE_EXECUTE PROT_EXEC |
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#else |
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#define VM_PAGE_NOACCESS 0x0 |
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#define VM_PAGE_READ 0x1 |
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#define VM_PAGE_WRITE 0x2 |
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#define VM_PAGE_EXECUTE 0x4 |
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#endif |
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#endif |
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/* Default protection bits. */ |
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#define VM_PAGE_DEFAULT (VM_PAGE_READ | VM_PAGE_WRITE) |
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/* Initialize the VM system. Returns 0 if successful, -1 for errors. */ |
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extern int vm_init(void); |
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/* Deallocate all internal data used to wrap virtual memory allocators. */ |
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extern void vm_exit(void); |
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/* Allocate zero-filled memory of SIZE bytes. The mapping is private |
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and default protection bits are read / write. The return value |
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is the actual mapping address chosen or VM_MAP_FAILED for errors. */ |
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extern void * vm_acquire(size_t size); |
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/* Allocate zero-filled memory at exactly ADDR (which must be page-aligned). |
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Returns 0 if successful, -1 on errors. */ |
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extern int vm_acquire_fixed(void * addr, size_t size); |
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/* Deallocate any mapping for the region starting at ADDR and extending |
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LEN bytes. Returns 0 if successful, -1 on errors. */ |
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extern int vm_release(void * addr, size_t size); |
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/* Change the memory protection of the region starting at ADDR and |
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extending LEN bytes to PROT. Returns 0 if successful, -1 for errors. */ |
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extern int vm_protect(void * addr, size_t size, int prot); |
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#endif /* VM_ALLOC_H */ |
