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74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
/******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along
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with Sortix. If not, see <http://www.gnu.org/licenses/>.
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memorymanagement.h
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Functions that allow modification of virtual memory.
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******************************************************************************/
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#ifndef SORTIX_MEMORYMANAGEMENT_H
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#define SORTIX_MEMORYMANAGEMENT_H
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// Forward declarations.
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typedef struct multiboot_info multiboot_info_t;
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namespace Sortix
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{
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namespace Page
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{
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addr_t Get();
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void Put(addr_t page);
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// Rounds a memory address down to nearest page.
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inline addr_t AlignDown(addr_t page) { return page & ~(0xFFFUL); }
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// Rounds a memory address up to nearest page.
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inline addr_t AlignUp(addr_t page) { return AlignDown(page + 0xFFFUL); }
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}
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namespace Memory
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{
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void Init(multiboot_info_t* bootinfo);
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void InvalidatePage(addr_t addr);
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void Flush();
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addr_t Fork();
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addr_t SwitchAddressSpace(addr_t addrspace);
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void DestroyAddressSpace();
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bool MapRangeKernel(addr_t where, size_t bytes);
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void UnmapRangeKernel(addr_t where, size_t bytes);
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bool MapRangeUser(addr_t where, size_t bytes);
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void UnmapRangeUser(addr_t where, size_t bytes);
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bool MapKernel(addr_t physical, addr_t mapto);
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bool MapUser(addr_t physical, addr_t mapto);
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addr_t UnmapKernel(addr_t mapto);
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addr_t UnmapUser(addr_t mapto);
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void Statistics(size_t* amountused, size_t* totalmem);
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#if defined(PLATFORM_X86)
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const addr_t HEAPLOWER = 0x80000000UL;
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const addr_t HEAPUPPER = 0xFF400000UL;
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#elif defined(PLATFORM_X64)
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const addr_t HEAPLOWER = 0xFFFF800000000000UL;
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const addr_t HEAPUPPER = 0xFFFFFE8000000000UL;
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#endif
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}
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}
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#endif
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