72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
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#define MODULE "vmm"
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#include "memory/AddressSpace.h"
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#include "log/Log.h"
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#include "memory/PMM.h"
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#include "memory/VMM.h"
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AddressSpace AddressSpace::create()
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{
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AddressSpace result;
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result.m_pml4 = (PageTable*)PMM::request_page();
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VMM::install_kernel_page_directory_into_address_space(result);
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return result;
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}
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void AddressSpace::destroy()
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{
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uint64_t pages_freed = 0;
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for (int i = 0; i < 512; i++)
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{
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PageDirectoryEntry& pdp_pde = m_pml4->entries[i];
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if (!pdp_pde.present) continue;
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if (pdp_pde.larger_pages)
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{
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pages_freed++;
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PMM::free_page((void*)pdp_pde.get_address());
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continue;
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}
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PageTable* pdp = (PageTable*)pdp_pde.get_address();
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for (int j = 0; j < 511; j++) // skip the last page directory, it's the kernel one
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{
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PageDirectoryEntry& pd_pde = pdp->entries[j];
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if (!pd_pde.present) continue;
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if (pd_pde.larger_pages)
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{
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pages_freed++;
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PMM::free_page((void*)pd_pde.get_address());
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continue;
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}
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PageTable* pd = (PageTable*)pd_pde.get_address();
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for (int k = 0; k < 512; k++)
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{
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PageDirectoryEntry& pt_pde = pd->entries[k];
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if (!pt_pde.present) continue;
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if (pt_pde.larger_pages)
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{
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pages_freed++;
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PMM::free_page((void*)pt_pde.get_address());
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continue;
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}
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PageTable* pt = (PageTable*)pt_pde.get_address();
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for (int l = 0; l < 512; l++)
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{
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PageDirectoryEntry& pde = pt->entries[l];
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if (pde.present) continue;
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pages_freed++;
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PMM::free_page((void*)pde.get_address());
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}
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pages_freed++;
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PMM::free_page(pt);
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}
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pages_freed++;
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PMM::free_page(pd);
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}
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pages_freed++;
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PMM::free_page(pdp);
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}
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pages_freed++;
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PMM::free_page(m_pml4);
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kdbgln("Reclaimed %ld pages from address space!", pages_freed);
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}
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