ejung/bsb2
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mark unavailable

Browse Source
This commit is contained in:
Eggert Jung
2026-01-11 21:29:41 +01:00
parent 064ed508c6
commit 139d91fdfc
1 changed files with 21 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
kernel/memory/pageframealloc.cc
View File

@@ -4,9 +4,20 @@
#include "../debug/output.h"
#include "../memory/config.h"
#include "../arch/lapic.h"
#include "../arch/apic.h"
uint8_t PageFrameAllocator::bitmap[4294967296 / 4096 / 8];
void mark_unavailable(uintptr_t start, uintptr_t end){
DBG << "start: " << hex << start << " end: " << end << endl;
for(uint64_t i = start; i < end; i += 4096){
uint64_t pg = i/4096;
PageFrameAllocator::bitmap[pg/8] &= ~(1 << pg%8);
}
}
void PageFrameAllocator::init(){
Multiboot::Memory* memory_map_entry = Multiboot::getMemoryMap();
@@ -29,17 +40,17 @@ void PageFrameAllocator::init(){
memory_map_entry = memory_map_entry->getNext();
}
// kernel image
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);
}
DBG << "kernel image ";
mark_unavailable((uintptr_t)&___KERNEL_START___, (uintptr_t)&___KERNEL_END___);
// ISA adresses
for(uint64_t i = (uint64_t)0x00F00000; i < (uint64_t)0x00FFFFFF; i += 4096){
uint64_t pg = i/4096;
bitmap[pg/8] &= ~(1 << pg%8);
}
DBG << "ISA adresses ";
mark_unavailable(0x00F00000, 0x00FFFFFF);
DBG << "LAPIC ";
mark_unavailable(0xfee00000, 0xfee003f0);
DBG << "IO APIC ";
mark_unavailable(APIC::getIOAPICAddress(), APIC::getIOAPICAddress()+0x10);
stats();
}