BarinkOS/source/kernel/memory/PageDirectory.cpp

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#include "PageDirectory.h"
void PageDirectory::enable()
{
// https://wiki.osdev.org/Setting_Up_Paging
//set each entry to not present
// int i;
// for(i = 0; i < 1024; i++)
// {
// // This sets the following flags to the pages:
// // Supervisor: Only kernel-mode can access them
// // Write Enabled: It can be both read from and written to
// // Not Present: The page table is not present
// this->page_directory[i] = 0x00000002;
// }
// // holds the physical address where we want to start mapping these pages to.
// // in this case, we want to map these pages to the very beginning of memory.
// //we will fill all 1024 entries in the table, mapping 4 megabytes
// for(unsigned int i = 0; i < 1024; i++)
// {
// // As the address is page aligned, it will always leave 12 bits zeroed.
// // Those bits are used by the attributes ;)
// first_page_table[i] = (i * 0x1000) | 3; // attributes: supervisor level, read/write, present.
// }
// // attributes: supervisor level, read/write, present
// this->page_directory[0] = ((unsigned int)first_page_table) | 3;
printf("Enable Paging!\n");
loadPageDirectory(this->page_directory);
enablePaging();
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}
void PageDirectory::MapPhysicalToVirtualAddress ( address_t PAddress , address_t VAddress, uint32_t size )
{
}