dvander@28: /* vim: set ts=4 sw=4 tw=99 et:
dvander@28:  *
dvander@28:  * Copyright (C) 2012 David Anderson
dvander@28:  *
dvander@28:  * This file is part of JITCraft.
dvander@28:  *
dvander@28:  * JITCraft is free software: you can redistribute it and/or modify it under
dvander@28:  * the terms of the GNU General Public License as published by the Free
dvander@28:  * Software Foundation, either version 3 of the License, or (at your option)
dvander@28:  * any later version.
dvander@28:  * 
dvander@28:  * Foobar is distributed in the hope that it will be useful, but WITHOUT ANY
dvander@28:  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
dvander@28:  * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
dvander@28:  *
dvander@28:  * You should have received a copy of the GNU General Public License along with
dvander@28:  * JITCraft. If not, see http://www.gnu.org/licenses/.
dvander@28:  */
dvander@28: #ifndef _include_jitcraft_platform_h_
dvander@28: #define _include_jitcraft_platform_h_
dvander@28: 
dvander@28: #include "Utility.h"
dvander@28: 
dvander@59: namespace ke {
dvander@28: 
dvander@11: namespace OS {
dvander@11:     enum Protection {
dvander@11:         Prot_ReadWrite,         // rw-, for the heap
dvander@11:         Prot_ReadExecute,       // r-x, for code
dvander@11:         Prot_ReadWriteExecute   // rwx, if disabling r-x for code.
dvander@11:     };
dvander@11: 
dvander@11:     enum MapMode {
dvander@11:         Map_Reserve,            // don't ask for actual pages yet
dvander@11:         Map_Commit              // ask for pages right away
dvander@11:     };
dvander@11: 
dvander@11:     Address MapMemory(size_t amount, MapMode mode, Protection prot);
dvander@11:     bool CommitMemory(Address address, size_t amount, Protection prot);
dvander@11:     void UnmapMemory(Address address, size_t size);
dvander@11: 
dvander@11:     class AlignableMapping {
dvander@11:         Address base_;
dvander@11:         Address aligned_;
dvander@11:         size_t size_;
dvander@11: 
dvander@11:       public:
dvander@11:         AlignableMapping(Address ptr, size_t alignment, size_t size)
dvander@11:           : base_(ptr),
dvander@11:             size_(size)
dvander@11:         {
dvander@11:             aligned_ = base_;
dvander@11:             if (!IsAligned(aligned_, alignment))
dvander@11:                 aligned_ = AlignedBase(aligned_, alignment) + alignment;
dvander@11:         }
dvander@11: 
dvander@11:         AlignableMapping() : base_(NULL), aligned_(NULL), size_(0)
dvander@11:         {
dvander@11:         }
dvander@11: 
dvander@11:         Address base() const {
dvander@11:             return base_;
dvander@11:         }
dvander@11:         bool isValid() const {
dvander@11:             return !!base_;
dvander@11:         }
dvander@11:         size_t size() const {
dvander@11:             return size_;
dvander@11:         }
dvander@11:         Address aligned() const {
dvander@11:             return aligned_;
dvander@11:         }
dvander@11:     };
dvander@11: 
dvander@51:     // MapAlignedMemory is guaranteed to return zeroed memory.
dvander@11:     AlignableMapping MapAlignedMemory(size_t amount, size_t alignment, MapMode mode);
dvander@11:     void UnmapAlignedMemory(Address address, size_t size);
dvander@11: 
dvander@11:     // The default alignment of memory returned via MapMemory().
dvander@11:     // :TODO: better ifdefs
dvander@11: #ifdef _MSC_VER
dvander@28:     static const size_t kPageAlignment = 64 * kKB;
dvander@11: #else
dvander@28:     static const size_t kPageAlignment = 4 * kKB;
dvander@11: #endif
dvander@11: 
dvander@28: }
dvander@28: 
dvander@28: }
dvander@28: 
dvander@28: #endif // _include_jitcraft_platform_h_