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/******************************** -*- C -*- ****************************
*
* System specific implementation module.
*
* This module contains implementations of various operating system
* specific routines. This module should encapsulate most (or all)
* of these calls so that the rest of the code is portable.
*
*
***********************************************************************/
/***********************************************************************
*
* Copyright 1988,89,90,91,92,94,95,99,2000,2001,2002,2003,2006,2007,2008,2009
* Free Software Foundation, Inc.
* Written by Steve Byrne.
*
* This file is part of GNU Smalltalk.
*
* GNU Smalltalk 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, or (at your option) any later
* version.
*
* Linking GNU Smalltalk statically or dynamically with other modules is
* making a combined work based on GNU Smalltalk. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* In addition, as a special exception, the Free Software Foundation
* give you permission to combine GNU Smalltalk with free software
* programs or libraries that are released under the GNU LGPL and with
* independent programs running under the GNU Smalltalk virtual machine.
*
* You may copy and distribute such a system following the terms of the
* GNU GPL for GNU Smalltalk and the licenses of the other code
* concerned, provided that you include the source code of that other
* code when and as the GNU GPL requires distribution of source code.
*
* Note that people who make modified versions of GNU Smalltalk are not
* obligated to grant this special exception for their modified
* versions; it is their choice whether to do so. The GNU General
* Public License gives permission to release a modified version without
* this exception; this exception also makes it possible to release a
* modified version which carries forward this exception.
*
* GNU Smalltalk 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
* GNU Smalltalk; see the file COPYING. If not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
***********************************************************************/
#include "gstpriv.h"
#ifdef WIN32
# define WIN32_LEAN_AND_MEAN /* avoid including junk */
# include <windows.h>
#endif
#ifndef MAP_FAILED
# define MAP_FAILED ((char *) -1)
#endif
int
_gst_mem_protect (PTR addr, size_t len, int prot)
{
DWORD oldprot;
int my_prot;
switch (prot & (PROT_READ | PROT_WRITE | PROT_EXEC))
{
case PROT_NONE:
my_prot = 0; break;
case PROT_READ:
my_prot = PAGE_READONLY; break;
case PROT_WRITE:
case PROT_READ | PROT_WRITE:
my_prot = PAGE_READWRITE; break;
case PROT_EXEC:
my_prot = PAGE_EXECUTE; break;
case PROT_EXEC | PROT_READ:
my_prot = PAGE_EXECUTE_READ; break;
case PROT_EXEC | PROT_WRITE:
case PROT_EXEC | PROT_READ | PROT_WRITE:
my_prot = PAGE_EXECUTE_READWRITE; break;
default:
return -1;
}
if (VirtualProtect (addr, len, my_prot, &oldprot))
return 0;
else
return -1;
}
PTR
_gst_osmem_alloc (size_t size)
{
PTR addr;
addr = VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_NOACCESS);
if (addr)
{
PTR result = VirtualAlloc (addr, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if (result)
return result;
VirtualFree (addr, size, MEM_RELEASE);
}
errno = ENOMEM;
return NULL;
}
void
_gst_osmem_free (PTR ptr, size_t size)
{
VirtualFree(ptr, size, MEM_DECOMMIT);
VirtualFree(ptr, size, MEM_RELEASE);
}
PTR
_gst_osmem_reserve (PTR address, size_t size)
{
PTR base;
base = VirtualAlloc(address, size, MEM_RESERVE, PAGE_NOACCESS);
if (!base && address)
base = VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_NOACCESS);
if (!base)
errno = ENOMEM;
return base;
}
void
_gst_osmem_release (PTR base, size_t size)
{
VirtualFree(base, size, MEM_RELEASE);
}
PTR
_gst_osmem_commit (PTR base, size_t size)
{
PTR addr;
addr = VirtualAlloc (base, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if (!addr)
errno = ENOMEM;
return addr;
}
void
_gst_osmem_decommit (PTR base, size_t size)
{
VirtualFree(base, size, MEM_DECOMMIT);
}
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