apio/Luna
1
1
Fork 0
Code Issues Pull Requests Actions Projects Releases 8 Wiki Activity

VMM: check if the entry is already present

Browse Source
This commit is contained in:
apio 2022-10-17 17:26:16 +02:00
parent 682be58d97
commit b334e1cd50
1 changed files with 11 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
kernel/src/memory/VMM.cpp
View File

@ -275,13 +275,19 @@ void VMM::install_kernel_page_directory_into_address_space(AddressSpace& space)
PageTable* kernel_last_pdp = (PageTable*)kernel_pml4->entries[511].get_address();
PageTable* kernel_last_pd = (PageTable*)kernel_last_pdp->entries[511].get_address();
PageTable* space_last_pdp = (PageTable*)PMM::request_page();
PageDirectoryEntry& space_last_pdp_pde = space_pml4->entries[511];
PageTable* space_last_pdp;
if (!space_last_pdp_pde.present)
{
space_last_pdp = (PageTable*)PMM::request_page();
space_last_pdp_pde.present = true;
space_last_pdp_pde.read_write = true;
space_last_pdp_pde.set_address((uint64_t)space_last_pdp);
}
else { space_last_pdp = (PageTable*)space_last_pdp_pde.get_address(); }
PageDirectoryEntry& space_last_pd_pde = space_last_pdp->entries[511];