// Generate page table for IA-32e
void kInitializePageTables( void )
{
PML4TENTRY* pstPML4TEntry;
PDPTENTRY* pstPDPTEntry;
PDENTRY* pstPDEntry;
DWORD dwMappingAddress;
int i;
// Generate PML4 Table
// Except for first, set 0x00
pstPML4TEntry = ( PML4TENTRY* ) 0x100000;
kSetPageEntryData( &( pstPML4TEntry[0] ), 0x00, 0x101000, PAGE_FLAGS_DEFAULT, 0 );
for ( i = 1 ; i < PAGE_MAXENTRYCOUNT ; i++ )
{
// Don't use this section
// Initiate 0
kSetPageEntryData( &( pstPML4TEntry[i] ), 0, 0 ,0 ,0 );
}
// Generate Page Directory Pointer Table
// One PDPT can handle fully 512GB
// We set 64 entries for 64GB
pstPDPTEntry = ( PDPTENTRY* ) 0x101000;
for ( i = 0 ; i < 64 ; i++ )
{
kSetPageEntryData( &( pstPDPTEntry[i]),
0, 0x102000 + ( i * PAGE_TABLESIZE ), PAGE_FLAGS_DEFAULT, 0 );
}
for ( i = 64 ; i < PAGE_MAXENTRYCOUNT ; i++ )
{
// Don't use this section
// Initiate 0
kSetPageEntryData( &( pstPDPTEntry[i] ), 0, 0, 0, 0);
}
// Generate Page Directory
// One page directory can handle 1GB
// We set 64 entries for 64GB
pstPDEntry = ( PDENTRY* ) 0x102000;
dwMappingAddress = 0;
for ( i = 0 ; i < PAGE_MAXENTRYCOUNT * 64 ; i++ )
{
// Here is Proteced mode(32 bit)
// To access 64 bit address,
// access unit is MB ( >> 20 )
// For under 4GB, dwUpperBaseAddress is 0
kSetPageEntryData( &( pstPDEntry[i] ),
( i * ( PAGE_DEFAULTSIZE >> 20 ) ) >> 12, dwMappingAddress,
PAGE_FLAGS_DEFAULT | PAGE_FLAGS_PS, 0 );
dwMappingAddress += PAGE_DEFAULTSIZE;
}
}
/**
* IA-32e 모드 커널을 위한 페이지 테이블 생성
*/
void kInitializePageTables( void )
{
PML4TENTRY* pstPML4TEntry;
PDPTENTRY* pstPDPTEntry;
PDENTRY* pstPDEntry;
DWORD dwMappingAddress;
int i;
// PML4 테이블 생성
// 첫 번째 엔트리 외에 나머지는 모두 0으로 초기화
pstPML4TEntry = ( PML4TENTRY* ) 0x100000;
kSetPageEntryData( &( pstPML4TEntry[ 0 ] ), 0x00, 0x101000, PAGE_FLAGS_DEFAULT,
0 );
for( i = 1 ; i < PAGE_MAXENTRYCOUNT ; i++ )
{
kSetPageEntryData( &( pstPML4TEntry[ i ] ), 0, 0, 0, 0 );
}
// 페이지 디렉터리 포인터 테이블 생성
// 하나의 PDPT로 512GByte까지 매핑 가능하므로 하나로 충분함
// 64개의 엔트리를 설정하여 64GByte까지 매핑함
pstPDPTEntry = ( PDPTENTRY* ) 0x101000;
for( i = 0 ; i < 64 ; i++ )
{
kSetPageEntryData( &( pstPDPTEntry[ i ] ), 0, 0x102000 + ( i * PAGE_TABLESIZE ),
PAGE_FLAGS_DEFAULT, 0 );
}
for( i = 64 ; i < PAGE_MAXENTRYCOUNT ; i++ )
{
kSetPageEntryData( &( pstPDPTEntry[ i ] ), 0, 0, 0, 0 );
}
// 페이지 디렉터리 테이블 생성
// 하나의 페이지 디렉터리가 1GByte까지 매핑 가능
// 여유있게 64개의 페이지 디렉터리를 생성하여 총 64GB까지 지원
pstPDEntry = ( PDENTRY* ) 0x102000;
dwMappingAddress = 0;
for( i = 0 ; i < PAGE_MAXENTRYCOUNT * 64 ; i++ )
{
// 32비트로는 상위 어드레스를 표현할 수 없으므로, Mbyte 단위로 계산한 다음
// 최종 결과를 다시 4Kbyte로 나누어 32비트 이상의 어드레스를 계산함
kSetPageEntryData( &( pstPDEntry[ i ] ),
( i * ( PAGE_DEFAULTSIZE >> 20 ) ) >> 12, dwMappingAddress,
PAGE_FLAGS_DEFAULT | PAGE_FLAGS_PS, 0 );
dwMappingAddress += PAGE_DEFAULTSIZE;
}
}
/// Initialize page tables for IA-32e mode
void k32PageManager::kInitPage(void)
{
// Allocate PML4 table
kSetPageTableAddress(&pstPML4T, (PTE*)0x100000);
// Set all enties as 0, except for the first entry
kSetPageEntryData(&(pstPML4T[0]), 0x00, 0x101000, PAGE_FLAGS_DEFAULT, 0);
for (int i = 1; i < PAGE_MAXENTRYCOUNT; i++) {
kSetPageEntryData(&(pstPML4T[i]), 0, 0, 0, 0);
}
// Allocate PDP table
kSetPageTableAddress(&pstPDPT, (PTE*)0x101000);
// Set 64 entries to handle up to 64 GB
// The others are set as 0
for (int i = 0; i < 64; i++) {
kSetPageEntryData(&(pstPDPT[i]), 0, 0x102000 + (i * PAGE_TABLESIZE),
PAGE_FLAGS_DEFAULT, 0);
}
for (int i = 64; i < PAGE_MAXENTRYCOUNT; i++) {
kSetPageEntryData(&(pstPDPT[i]), 0, 0, 0, 0);
}
// Allocate PD table
kSetPageTableAddress(&pstPDT, (PTE*)0x102000);
int dwMappingAddress = 0;
// One page table can handle 2 MB
// To set 64 GB, 2 * 512 * 64 times are required
for (int i = 0; i < PAGE_MAXENTRYCOUNT * 64; i++) {
// Total number of bits is 64 bits
// To access above 32 bits, use shift operation
kSetPageEntryData(&(pstPDT[i]), (i * (PAGE_DEFAULTSIZE >> 20)) >> 12,
dwMappingAddress,
PAGE_FLAGS_DEFAULT | PAGE_FLAGS_PS, 0);
dwMappingAddress += PAGE_DEFAULTSIZE;
}
return;
}
