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add bitmap

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This commit is contained in:
Eggert Jung
2026-01-10 22:29:28 +01:00
parent 0e3195ec3d
commit af3a28aa90
2 changed files with 26 additions and 4 deletions
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28
kernel/memory/pageframealloc.cc
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@@ -5,16 +5,36 @@
#include "../memory/config.h"
uint8_t PageFrameAllocator::bitmap[4294967296 / 4096 / 8];
void PageFrameAllocator::init(){
Multiboot::Memory* memory_map_start = Multiboot::getMemoryMap();
Multiboot::Memory* memory_map_entry = Multiboot::getMemoryMap();
dout << "kernel start: " << ___KERNEL_START___;
dout << " kernel end: " << ___KERNEL_END___ << endl;
while(memory_map_start != 0){
dout << "Memory: " << hex << memory_map_start->getStartAddress() << " to " << memory_map_start->getEndAddress() << " is available: " << memory_map_start->isAvailable() << ".\n";
memory_map_start = memory_map_start->getNext();
while(memory_map_entry != 0){
void* start = memory_map_entry->getStartAddress();
void* end = memory_map_entry->getEndAddress();
bool available = memory_map_entry->isAvailable();
dout << "Memory: " << hex << start << " to " << end << " is available: " << available << "." << endl;
//TODO priotity for conflicting regions
for(uint64_t i = (uint64_t)start; i < (uint64_t)end; i += 4096){
uint64_t pg = i/4096;
if(available)
bitmap[pg/8] |= 1 << pg%8;
else
bitmap[pg/8] &= ~(1 << pg%8);
}
memory_map_entry = memory_map_entry->getNext();
}
for(uint64_t i = (uint64_t)&___KERNEL_START___; i < (uint64_t)&___KERNEL_END___; i += 4096){
uint64_t pg = i/4096;
bitmap[pg/8] &= ~(1 << pg%8);
}
}
void PageFrameAllocator::stats(){