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os-k/include/mm/mm.h

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//----------------------------------------------------------------------------//
// GNU GPL OS/K //
// //
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// Desc: Memory manager functions //
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// //
// //
// 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 _KERNEL_H
#include <kernel.h>
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#endif
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#ifndef _MM_MM_H
#define _MM_MM_H
//----------------------------------------------------------------------------//
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#define MINIMUM_RAM_SIZE 16 // Mio, the minimum RAM size.
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#define IOMAP_SIZE (8 * 1024)
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#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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#define KPAGESIZE (4 * KB)
#define UPAGESIZE (2 * MB)
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//----------------------------------------------------------------------------//
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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 entry
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struct GdtEntry_t
{
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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
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uchar flags;
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uchar highBase; // last 8 bits
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} __attribute__((__packed__));
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struct TssDescriptor_t
{
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ushort lowLimit;
ushort lowBase;
uchar middleBase;
uchar access;
uchar flags;
uchar highBase;
uint veryHighBase;
uint reserved;
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} __attribute__ ((packed));
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struct Tss_t
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{
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uint reserved1;
// Stack pointers (RSP) for privilege levels 0-2
ulong rsp0;
ulong rsp1;
ulong rsp2;
ulong reserved2;
// Interrupt stack table pointers
ulong ist1;
ulong ist2;
ulong ist3;
ulong ist4;
ulong ist5;
ulong ist6;
ulong ist7;
ulong reserved3;
ushort reserved4;
// Offset to the I/O permission bit map from the 64-bit TSS base
ushort iomap_base;
uchar iomap[IOMAP_SIZE];
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} __attribute__ ((packed));
// The gdt pointer
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struct GdtPtr_t
{
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ushort limit; // upper 16 bits
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ulong 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
//
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extern void MmLoadGdt(GdtPtr_t *gdtPtr, ushort tssOffset);
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//
// Stores the descriptor table
//
extern void MmStoreGdt(void);
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void MmInitPaging(void);
void MmActivatePageHandler(void);
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//
// Returns the address of the stack guard pages
//
void *MmGetStackGuards(char rank);
//
// Translate a virtual address into physical address
//
void *MmTranslateKPageToAddr(void *rank);
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// Page directory pointer offset
typedef ulong pdpe_t;
// Page directory offset
typedef ulong pde_t;
// Page table entry
typedef ulong pte_t;
// paging.asm
void MmLoadPML4(void *);
void MmEnableWriteProtect(void);
void MmDisableWriteProtect(void);
void *MmGetStackGuards(char rank);
//----------------------------------------------------------------------------//
#endif