144 lines
4.3 KiB
C++
144 lines
4.3 KiB
C++
#include "../memory/pageframealloc.h"
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#include "../boot/multiboot/data.h"
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#include "page.h"
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#include "pageframe.h"
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#include "../debug/output.h"
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#include "../memory/config.h"
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#include "../arch/lapic.h"
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#include "../arch/apic.h"
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//uint8_t PageFrameAllocator::bitmap[4294967296 / 4096 / 8];
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PageFrame PageFrameAllocator::PageFrames[4294967296 / 4096];
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void mark_pageframes(uintptr_t start, uintptr_t end, bool available){
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// DBG << "start: " << hex << start << " end: " << end;
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start = Page::floor(start);
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end = Page::ceil(end);
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if(start > 4294967296)
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start = 4294967296;
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if(end > 4294967296)
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end = 4294967296;
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//DBG << " page start: " << hex << start << " end: " << end << endl;
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for(uint64_t i = start; i < end; i += 4096){
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uint64_t pg = i/4096;
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PageFrameAllocator::PageFrames[pg].available = available;
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//if(available)
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// PageFrameAllocator::bitmap[pg/8] |= (1 << pg%8);
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//else
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// PageFrameAllocator::bitmap[pg/8] &= ~(1 << pg%8);
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}
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}
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void PageFrameAllocator::init(){
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Multiboot::Memory* memory_map_start = Multiboot::getMemoryMap();
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Multiboot::Memory* memory_map_entry = memory_map_start;
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//mark as available
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while(memory_map_entry != 0){
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uintptr_t start = (uintptr_t)memory_map_entry->getStartAddress();
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uintptr_t end = (uintptr_t)memory_map_entry->getEndAddress();
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bool available = memory_map_entry->isAvailable();
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if(available)
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mark_pageframes(start, end, true);
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memory_map_entry = memory_map_entry->getNext();
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}
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//mark as unavailable
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memory_map_entry = memory_map_start;
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while(memory_map_entry != 0){
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uintptr_t start = (uintptr_t)memory_map_entry->getStartAddress();
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uintptr_t end = (uintptr_t)memory_map_entry->getEndAddress();
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bool available = memory_map_entry->isAvailable();
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if(!available)
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mark_pageframes(start, end, false);
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memory_map_entry = memory_map_entry->getNext();
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}
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//mark other known regions as unavailable
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mark_pageframes((uintptr_t)&___KERNEL_START___, (uintptr_t)&___KERNEL_END___, false);
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mark_pageframes(0x00F00000, 0x00FFFFFF, false);
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mark_pageframes(0xfee00000, 0xfee003f0, false);
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mark_pageframes(APIC::getIOAPICAddress(), APIC::getIOAPICAddress()+0x10, false);
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}
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void PageFrameAllocator::stats(){
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Multiboot::Memory* memory_map_entry = Multiboot::getMemoryMap();
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while(memory_map_entry != 0){
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void* start = memory_map_entry->getStartAddress();
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void* end = memory_map_entry->getEndAddress();
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bool available = memory_map_entry->isAvailable();
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DBG << "Memory: " << hex << start << " to " << end << " is available: " << available << "." << endl;
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memory_map_entry = memory_map_entry->getNext();
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}
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uint64_t pages_available = 0;
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for(uint64_t i=0; i<(sizeof(PageFrames)/sizeof(PageFrames[0]));i++){
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if(PageFrames[i].available)
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//if(bitmap[i/8] & (1<<i%8))
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pages_available++;
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}
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for(uint64_t i=0; i < 0x2000000/4096/8; i++){
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if(i%64 == 0){
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DBG << endl << hex << i * 8 * 4096 << " " << flush;
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int x,y;
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dout.getPos(x,y);
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for(uint8_t j=x; j<10; j++){
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DBG<<" ";
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}
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}
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if(PageFrames[i].available)
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DBG << '#';
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else
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DBG << '.';
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}
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DBG << "\npages available: " << dec << pages_available << endl;
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}
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PageFrame* PageFrameAllocator::alloc(bool kernel){
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uintptr_t search_start;
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uintptr_t search_end;
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if(kernel){
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search_start = Page::ceil((uintptr_t)&___KERNEL_END___);
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search_end = 0x4000000;
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}
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else{
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search_start = 0x4000000;
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search_end = 0x8000000; //TODO find some appropriate value
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}
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uint64_t free_pageframe=0;
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//TODO make this more efficent
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for(uint64_t i=search_start/4096; i < search_end/4096; i++){
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if(PageFrames[i].available){
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free_pageframe = i;
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break;
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}
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}
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if(!free_pageframe)
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return 0;
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mark_pageframes(free_pageframe*4096, free_pageframe*4096, false);
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return &PageFrames[free_pageframe];
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}
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void PageFrameAllocator::free(PageFrame* frame){
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(void) frame;
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}
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void PageFrameAllocator::free(uintptr_t addr){
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(void) addr;
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}
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