Tiberiu Chibici
caa7718af9
==================================================== Mainly changed: HAL.FSs + Updated 'mount' call in floppy driver, now done after controller is initialized + Added 'detect' function for FAT file systems + Implemented 'initdr' driver, however still bugged + Improved logger
89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
/*
|
|
* memory-init.c
|
|
*
|
|
* Created on: Aug 27, 2011
|
|
* Author: Tiberiu
|
|
*/
|
|
#include <memory-add.h>
|
|
#include <multiboot.h>
|
|
#include <debugio.h>
|
|
#include "../../drivers/cmos/cmos.h"
|
|
#include <stdio.h>
|
|
|
|
|
|
uint32 mem_kernel_end = 0;
|
|
uint8 mem_initialized = 0;
|
|
|
|
uint32 _memory_get_total_mem(MultibootInfo* info)
|
|
{
|
|
// Grub was nice enough to give us info
|
|
if (info->Flags & MultibootInfo_MEMORY) return (1024 + info->MemoryUpper);
|
|
|
|
// No? Get info from CMOS
|
|
uint8 low, high;
|
|
uint32 total;
|
|
|
|
low = CmosRead(0x30);
|
|
high = CmosRead(0x31);
|
|
total = (uint32)(low | high<<8) + 1024;
|
|
|
|
Error("Mem", "%#Missing memory info from bootloader. Reading from CMOS: %ukb\n", ColorLightRed, total);
|
|
|
|
return total;
|
|
}
|
|
|
|
void _memory_reserve_system(MultibootInfo* info)
|
|
{
|
|
MagicBreakpoint();
|
|
if ((info->Flags & MultibootInfo_MEM_MAP) != 0)
|
|
{
|
|
MultibootMemoryMapEntry* location = (MultibootMemoryMapEntry*)info->MemoryMapAddress;
|
|
|
|
while ((uint32)location < (info->MemoryMapAddress + info->MemoryMapLength))
|
|
{
|
|
if (location->Type > 1)
|
|
MemPhReserveFrames((uint32)location->Address, (uint32)location->Length);
|
|
|
|
location = (MultibootMemoryMapEntry*) ((uint32)location + location->Size + sizeof(uint32));
|
|
}
|
|
}
|
|
|
|
else
|
|
{
|
|
Error("Mem", "%#Missing %#memory map%# info from bootloader.\n", ColorLightRed, ColorWhite, ColorLightRed);
|
|
|
|
// Standard memory hole at 15mb
|
|
MemPhReserveFrames(0x00F00000, 0x00100000);
|
|
}
|
|
|
|
// Standard reserved memory areas
|
|
MemPhReserveFrames(0x0, 0x400 + 256); // Real mode IVT, BDA
|
|
MemPhReserveFrames(0x1000, 0x2400); // DMA buffer
|
|
MemPhReserveFrames(0x9FC00, 385*1024); // EBDA, Video memory, ROM area
|
|
}
|
|
|
|
|
|
void MemoryInitialize (MultibootInfo* info)
|
|
{
|
|
uint32 totalSystemMemory = _memory_get_total_mem(info);
|
|
|
|
MemPhInitialize(totalSystemMemory);
|
|
PagingInitialize(0x200000);
|
|
|
|
_memory_reserve_system(info);
|
|
|
|
KernelHeap = MemHeapCreate(KERNEL_HEAP_START, KERNEL_HEAP_START
|
|
+ KERNEL_HEAP_INITIAL_SIZE, 0xCFFFF000, 3); // is kernel, writeable
|
|
|
|
Log("Mem", "Done initializing memory!");
|
|
|
|
mem_initialized = 2;
|
|
}
|
|
|
|
void MemoryTempInitialize (uint32 kernel_end)
|
|
{
|
|
mem_initialized = 1;
|
|
mem_kernel_end = kernel_end;
|
|
Log("Mem", "Initialized temporary memory manager, allocating from %#0x%x.\n", kernel_end);
|
|
}
|