mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
109 lines
2.9 KiB
C++
109 lines
2.9 KiB
C++
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2014.
|
|
|
|
This file is part of Sortix.
|
|
|
|
Sortix 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 3 of the License, or (at your option) any later
|
|
version.
|
|
|
|
Sortix 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
|
|
Sortix. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
x86-family/memorymanagement.h
|
|
Handles memory for the x86 family of architectures.
|
|
|
|
*******************************************************************************/
|
|
|
|
#ifndef SORTIX_X86_FAMILY_MEMORYMANAGEMENT_H
|
|
#define SORTIX_X86_FAMILY_MEMORYMANAGEMENT_H
|
|
|
|
namespace Sortix {
|
|
|
|
struct PML
|
|
{
|
|
addr_t entry[4096 / sizeof(addr_t)];
|
|
};
|
|
|
|
} // namespace Sortix
|
|
|
|
namespace Sortix {
|
|
namespace Memory {
|
|
|
|
const addr_t PML_PRESENT = 1 << 0;
|
|
const addr_t PML_WRITABLE = 1 << 1;
|
|
const addr_t PML_USERSPACE = 1 << 2;
|
|
const addr_t PML_WRTHROUGH = 1 << 3;
|
|
const addr_t PML_NOCACHE = 1 << 4;
|
|
const addr_t PML_PAT = 1 << 7;
|
|
const addr_t PML_AVAILABLE1 = 1 << 9;
|
|
const addr_t PML_AVAILABLE2 = 1 << 10;
|
|
const addr_t PML_AVAILABLE3 = 1 << 11;
|
|
const addr_t PML_FORK = PML_AVAILABLE1;
|
|
const addr_t PML_FLAGS = 0xFFFUL; // Bits used for the flags.
|
|
const addr_t PML_ADDRESS = ~0xFFFUL; // Bits used for the address.
|
|
const addr_t PAT_UC = 0x00; // Uncacheable
|
|
const addr_t PAT_WC = 0x01; // Write-Combine
|
|
const addr_t PAT_WT = 0x04; // Writethrough
|
|
const addr_t PAT_WP = 0x05; // Write-Protect
|
|
const addr_t PAT_WB = 0x06; // Writeback
|
|
const addr_t PAT_UCM = 0x07; // Uncacheable, overruled by MTRR.
|
|
const addr_t PAT_NUM = 0x08;
|
|
|
|
// Desired PAT-Register PA-Field Indexing (different from BIOS defaults)
|
|
const addr_t PA[PAT_NUM] =
|
|
{
|
|
PAT_WB,
|
|
PAT_WT,
|
|
PAT_UCM,
|
|
PAT_UC,
|
|
PAT_WC,
|
|
PAT_WP,
|
|
0,
|
|
0,
|
|
};
|
|
|
|
// Inverse function of the above.
|
|
const addr_t PAINV[PAT_NUM] =
|
|
{
|
|
3, // UC
|
|
4, // WC
|
|
7, // No such
|
|
8, // No such
|
|
1, // WT
|
|
5, // WP,
|
|
0, // WB
|
|
2, // UCM
|
|
};
|
|
|
|
static inline addr_t EncodePATAsPMLFlag(addr_t pat)
|
|
{
|
|
pat = PAINV[pat];
|
|
addr_t result = 0;
|
|
if ( pat & 0x1 ) { result |= PML_WRTHROUGH; }
|
|
if ( pat & 0x2 ) { result |= PML_NOCACHE; }
|
|
if ( pat & 0x4 ) { result |= PML_PAT; }
|
|
return result;
|
|
}
|
|
|
|
bool MapPAT(addr_t physical, addr_t mapto, int prot, addr_t mtype);
|
|
addr_t ProtectionToPMLFlags(int prot);
|
|
int PMLFlagsToProtection(addr_t flags);
|
|
|
|
} // namespace Memory
|
|
} // namespace Sortix
|
|
|
|
#if defined(__i386__)
|
|
#include "../x86/memorymanagement.h"
|
|
#elif defined(__x86_64__)
|
|
#include "../x64/memorymanagement.h"
|
|
#endif
|
|
|
|
#endif
|