139 lines
4.2 KiB
C
139 lines
4.2 KiB
C
/*
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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) 1997-2008 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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#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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#include <sys/types.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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#ifdef HAVE_MACH_VM
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extern "C" {
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#include <mach/mach.h>
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#include <mach/task.h>
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}
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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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/* Option to vm_get_write_watch() to reset the write-tracking state
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once it was retrieved. Otherwise, you have to manually call
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vm_reset_write_watch() and potentially lose some info. */
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#define VM_WRITE_WATCH_RESET 0x01
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/* Mapping options. */
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#define VM_MAP_SHARED 0x01
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#define VM_MAP_PRIVATE 0x02
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#define VM_MAP_FIXED 0x04
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#define VM_MAP_32BIT 0x08
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#define VM_MAP_WRITE_WATCH 0x10
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/* Default mapping options. */
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#define VM_MAP_DEFAULT (VM_MAP_PRIVATE)
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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, int options = VM_MAP_DEFAULT);
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extern void * vm_acquire_reserved(size_t size);
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extern int vm_init_reserved(void * host_address);
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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, int options = VM_MAP_DEFAULT);
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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 SIZE 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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/* Return the addresses of the pages that got modified since the last
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reset of the write-tracking state for the specified range [ ADDR,
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ADDR + SIZE [. Returns 0 if successful, -1 for errors. */
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extern int vm_get_write_watch(void * addr, size_t size,
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void ** pages, unsigned int * n_pages,
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int options = 0);
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/* Reset the write-tracking state for the specified range [ ADDR, ADDR
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+ SIZE [. Returns 0 if successful, -1 for errors. */
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extern int vm_reset_write_watch(void * addr, size_t size);
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/* Returns the size of a page. */
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extern int vm_get_page_size(void);
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#endif /* VM_ALLOC_H */
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