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os-k/include/kernel/mm.h

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//----------------------------------------------------------------------------//
// GNU GPL OS/K //
// //
// Desc: Memory related functions //
// //
// //
// Copyright © 2018-2019 The OS/K Team //
// //
// This file is part of OS/K. //
// //
// OS/K 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 //
// any later version. //
// //
// OS/K 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 OS/K. If not, see <https://www.gnu.org/licenses/>. //
//----------------------------------------------------------------------------//
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#ifndef _KALKERN_BASE_H
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#include <kernel/base.h>
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#endif
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#ifndef _KALKERN_MM_H
#define _KALKERN_MM_H
//----------------------------------------------------------------------------//
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#define MINIMUM_RAM_SIZE 16 // Mio, the minimum RAM size.
#define AVAILABLE_ZONE 1 // Fully usable RAM zone
#define RESERVED_ZONE 2 // Used by the firmware
#define ACPI_ZONE 3 // Used by ACPI but can be freed
#define NVS_ZONE 4 // Dunno
#define BADRAM_ZONE 5 // Invalid zone because material problem...
#define MAX_ENTRIES 2048 // Max number of memory map entries
//----------------------------------------------------------------------------//
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// The entry structure of the map
struct MapEntry_t {
void *addr;
size_t length; // in bytes
uint type; // reserved or not
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} __attribute__((__packed__));
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// the map structure
struct MemoryMap_t {
size_t length;
size_t freeRamSize;
size_t nonfreeRamSize;
MapEntry_t entry[MAX_ENTRIES];
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} __attribute__((__packed__));
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// The gdt
struct GdtEntry_t
{
ushort lowLimit; // lower 16 bits
ushort lowBase; // lower 16 bits
uchar middleBase; // next 8 bits
uchar access; // determine what ring this segment can be used in
uchar granularity;
uchar highBase; // last 8 bits
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} __attribute__((__packed__));
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// The gdt pointer
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struct GdtPtr_t
{
uchar limit; // upper 16 bits
ushort base; // address of the first entry
} __attribute__((__packed__));
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//----------------------------------------------------------------------------//
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//
// Initializes the memory map structure
//
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void MmInitMemoryMap(void);
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//
// Initializes the memory map structure
//
void MmPrintMemoryMap(void);
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//
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// Returns the size of the first available memory zone
// from the start address pointer
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//
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size_t MmGetAvailZoneSize(void *start);
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//
// Returns the first available memory zone from the start address pointer
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//
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void *MmGetFirstAvailZone(void *start);
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//
// Initializes the descriptor table
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//
void MmInitGdt(void);
//
// Loads the descriptor table
//
extern void MmLoadGdt(GdtPtr_t *GdtPtr);
//----------------------------------------------------------------------------//
#endif