126 lines
4.2 KiB
C++
126 lines
4.2 KiB
C++
/*
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* Copyright (c) 2011, 2012, 2014, 2015, 2017 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* sortix/kernel/memorymanagement.h
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* Functions that allow modification of virtual memory.
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*/
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#ifndef _INCLUDE_SORTIX_KERNEL_MEMORYMANAGEMENT_H
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#define _INCLUDE_SORTIX_KERNEL_MEMORYMANAGEMENT_H
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#include <stddef.h>
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#include <stdint.h>
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#include <sortix/kernel/decl.h>
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typedef struct multiboot_info multiboot_info_t;
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namespace Sortix {
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class Process;
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enum page_usage
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{
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PAGE_USAGE_OTHER,
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PAGE_USAGE_PHYSICAL,
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PAGE_USAGE_PAGING_OVERHEAD,
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PAGE_USAGE_KERNEL_HEAP,
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PAGE_USAGE_FILESYSTEM_CACHE,
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PAGE_USAGE_USER_SPACE,
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PAGE_USAGE_EXECUTE,
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PAGE_USAGE_DRIVER,
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PAGE_USAGE_NETWORK_PACKET,
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PAGE_USAGE_NUM_KINDS,
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PAGE_USAGE_WASNT_ALLOCATED,
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};
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} // namespace Sortix
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namespace Sortix {
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namespace Page {
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bool Reserve(size_t* counter, size_t amount);
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bool ReserveUnlocked(size_t* counter, size_t amount);
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bool Reserve(size_t* counter, size_t least, size_t ideal);
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bool ReserveUnlocked(size_t* counter, size_t least, size_t ideal);
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addr_t GetReserved(size_t* counter, enum page_usage usage);
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addr_t GetReservedUnlocked(size_t* counter, enum page_usage usage);
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addr_t Get(enum page_usage usage);
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addr_t GetUnlocked(enum page_usage usage);
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addr_t Get32Bit(enum page_usage usage);
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addr_t Get32BitUnlocked(enum page_usage usage);
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void Put(addr_t page, enum page_usage usage);
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void PutUnlocked(addr_t page, enum page_usage usage);
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void Lock();
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void Unlock();
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inline size_t Size() { return 4096UL; }
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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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// Tests whether an address is page aligned.
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inline bool IsAligned(addr_t page) { return AlignDown(page) == page; }
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} // namespace Page
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} // namespace Sortix
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namespace Sortix {
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namespace Memory {
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const addr_t PAT_UC = 0x00; // Uncacheable
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const addr_t PAT_WC = 0x01; // Write-Combine
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const addr_t PAT_WT = 0x04; // Writethrough
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const addr_t PAT_WP = 0x05; // Write-Protect
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const addr_t PAT_WB = 0x06; // Writeback
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const addr_t PAT_UCM = 0x07; // Uncacheable, overruled by MTRR.
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const addr_t PAT_NUM = 0x08;
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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 GetAddressSpace();
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addr_t SwitchAddressSpace(addr_t addrspace);
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void DestroyAddressSpace(addr_t fallback);
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bool Map(addr_t physical, addr_t mapto, int prot);
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bool MapPAT(addr_t physical, addr_t mapto, int prot, addr_t mtype);
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addr_t Unmap(addr_t mapto);
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addr_t Physical(addr_t mapto);
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int PageProtection(addr_t mapto);
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bool LookUp(addr_t mapto, addr_t* physical, int* prot);
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int ProvidedProtection(int prot);
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void PageProtect(addr_t mapto, int protection);
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void PageProtectAdd(addr_t mapto, int protection);
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void PageProtectSub(addr_t mapto, int protection);
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bool MapRange(addr_t where, size_t bytes, int protection, enum page_usage usage);
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bool UnmapRange(addr_t where, size_t bytes, enum page_usage usage);
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void Statistics(size_t* amountused, size_t* totalmem);
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addr_t GetKernelStack();
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size_t GetKernelStackSize();
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void GetKernelVirtualArea(addr_t* from, size_t* size);
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void GetUserVirtualArea(uintptr_t* from, size_t* size);
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void UnmapMemory(Process* process, uintptr_t addr, size_t size);
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bool ProtectMemory(Process* process, uintptr_t addr, size_t size, int prot);
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bool MapMemory(Process* process, uintptr_t addr, size_t size, int prot);
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} // namespace Memory
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} // namespace Sortix
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#endif
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