mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
961ba9ec6c
This commit is joint work by Meisaka Yukara <Meisaka.Yukara@gmail.com> and Jonas 'Sortie' Termansen <sortie@maxsi.org>.
103 lines
2.6 KiB
C++
103 lines
2.6 KiB
C++
/*
|
|
* Copyright (c) 2011, 2012, 2014, 2015, 2017 Jonas 'Sortie' Termansen.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* x86-family/memorymanagement.h
|
|
* Handles memory for the x86 family of architectures.
|
|
*/
|
|
|
|
#ifndef SORTIX_X86_FAMILY_MEMORYMANAGEMENT_H
|
|
#define SORTIX_X86_FAMILY_MEMORYMANAGEMENT_H
|
|
|
|
#include <sortix/kernel/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;
|
|
#ifdef __x86_64__
|
|
const addr_t PML_NX = 1UL << 63;
|
|
#else
|
|
const addr_t PML_NX = 0;
|
|
#endif
|
|
const addr_t PML_FLAGS = 0xFFFUL | PML_NX; // Bits used for the flags.
|
|
const addr_t PML_ADDRESS = ~PML_FLAGS; // Bits used for the address.
|
|
|
|
// 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;
|
|
}
|
|
|
|
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
|