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dpm.hxx
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194 lines (144 loc) · 6.84 KB
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#pragma once
namespace phys {
bool is_address_valid( std::uint64_t pa );
}
namespace paging {
namespace dpm {
struct page_mapping_t {
std::uint64_t m_virtual_address;
pte* m_pte_address;
std::uint64_t m_original_pfn;
};
page_mapping_t m_page_mappings[ 64 ] = {};
bool m_is_initialized = false;
pte* get_pte_for_address( std::uint64_t address ) {
virt_addr_t va{ address };
auto pml4_va = nt::mm_get_virtual_for_physical( m_target_cr3 & ~0xf );
if ( !pml4_va ) return nullptr;
auto pml4 = reinterpret_cast< pml4e* >( pml4_va );
auto pml4_entry = &pml4[ va.pml4e_index ];
if ( !pml4_entry->hard.present ) return nullptr;
auto pdpt_va = nt::mm_get_virtual_for_physical( pml4_entry->hard.pfn << 12 );
if ( !pdpt_va ) return nullptr;
auto pdpt = reinterpret_cast< pdpte* >( pdpt_va );
auto pdpt_entry = &pdpt[ va.pdpte_index ];
if ( !pdpt_entry->hard.present ) return nullptr;
if ( pdpt_entry->hard.page_size ) return nullptr;
auto pd_va = nt::mm_get_virtual_for_physical( pdpt_entry->hard.pfn << 12 );
if ( !pd_va ) return nullptr;
auto pd = reinterpret_cast< pde* >( pd_va );
auto pd_entry = &pd[ va.pde_index ];
if ( !pd_entry->hard.present ) return nullptr;
if ( pd_entry->hard.page_size ) return nullptr;
auto pt_va = nt::mm_get_virtual_for_physical( pd_entry->hard.pfn << 12 );
if ( !pt_va ) return nullptr;
auto pt = reinterpret_cast< pte* >( pt_va );
auto pt_entry = &pt[ va.pte_index ];
if ( !pt_entry->hard.present ) return nullptr;
return pt_entry;
}
bool initialize( ) {
if ( m_is_initialized )
return false;
for ( auto i = 0; i < 64; i++ ) {
m_page_mappings[ i ].m_virtual_address = mmu::alloc_page( page_4kb_size );
if ( !m_page_mappings[ i ].m_virtual_address )
return false;
if ( !hide_pages( m_page_mappings[ i ].m_virtual_address, page_4kb_size ) )
return false;
m_page_mappings[ i ].m_pte_address = get_pte_for_address( m_page_mappings[ i ].m_virtual_address );
if ( !m_page_mappings[ i ].m_pte_address )
return false;
m_page_mappings[ i ].m_original_pfn = m_page_mappings[ i ].m_pte_address->hard.pfn;
}
m_is_initialized = true;
return true;
}
void cleanup( ) {
if ( !m_is_initialized )
return;
for ( auto i = 0; i < 64; i++ ) {
auto& mapping = m_page_mappings[ i ];
if ( mapping.m_pte_address && mapping.m_virtual_address ) {
_disable( );
mapping.m_pte_address->hard.pfn = mapping.m_original_pfn;
__invlpg( reinterpret_cast< void* >( mapping.m_virtual_address ) );
_enable( );
}
if ( mapping.m_virtual_address )
mapping.m_virtual_address = 0;
}
memset( m_page_mappings, 0, sizeof( m_page_mappings ) );
m_is_initialized = false;
}
std::uint64_t map_physical( std::uint64_t physical_address ) {
if ( !m_is_initialized ) {
return 0;
}
if ( !phys::is_address_valid( physical_address, page_4kb_size ) )
return 0;
auto processor = nt::ke_get_current_processor_number( );
if ( processor >= 64 )
processor = 0;
auto& mapping = m_page_mappings[ processor ];
if ( !mapping.m_pte_address || !mapping.m_virtual_address ) {
return 0;
}
_disable( );
mapping.m_pte_address->hard.pfn = physical_address >> page_shift;
mapping.m_pte_address->hard.read_write = 1;
__invlpg( reinterpret_cast< void* >( mapping.m_virtual_address ) );
_enable( );
return mapping.m_virtual_address + ( physical_address & page_4kb_mask );
}
bool read_physical( std::uint64_t physical_address, void* buffer, std::size_t size ) {
if ( !m_is_initialized ) {
return false;
}
if ( !phys::is_address_valid( physical_address, page_4kb_size ) )
return false;
auto processor = nt::ke_get_current_processor_number( );
if ( processor >= 64 )
processor = 0;
auto& mapping = m_page_mappings[ processor ];
if ( !mapping.m_pte_address || !mapping.m_virtual_address ) {
return false;
}
auto old_pfn = mapping.m_pte_address->hard.pfn;
_disable( );
mapping.m_pte_address->hard.pfn = physical_address >> page_shift;
__invlpg( reinterpret_cast< void* >( mapping.m_virtual_address ) );
auto source_ptr = reinterpret_cast< std::uint8_t* >( mapping.m_virtual_address ) + ( physical_address & page_4kb_mask );
__movsb( reinterpret_cast< std::uint8_t* >( buffer ), source_ptr, size );
mapping.m_pte_address->hard.pfn = old_pfn;
__invlpg( reinterpret_cast< void* >( mapping.m_virtual_address ) );
_enable( );
return true;
}
bool write_physical( std::uint64_t physical_address, void* buffer, std::size_t size ) {
if ( !m_is_initialized ) {
return false;
}
if ( !phys::is_address_valid( physical_address, page_4kb_size ) )
return false;
auto processor = nt::ke_get_current_processor_number( );
if ( processor >= 64 )
processor = 0;
auto& mapping = m_page_mappings[ processor ];
if ( !mapping.m_pte_address || !mapping.m_virtual_address ) {
return false;
}
auto old_pfn = mapping.m_pte_address->hard.pfn;
_disable( );
mapping.m_pte_address->hard.pfn = physical_address >> page_shift;
mapping.m_pte_address->hard.read_write = 1;
__invlpg( reinterpret_cast< void* >( mapping.m_virtual_address ) );
auto dest_ptr = reinterpret_cast< std::uint8_t* >( mapping.m_virtual_address ) + ( physical_address & page_4kb_mask );
__movsb( dest_ptr, reinterpret_cast< std::uint8_t* >( buffer ), size );
mapping.m_pte_address->hard.pfn = old_pfn;
__invlpg( reinterpret_cast< void* >( mapping.m_virtual_address ) );
_enable( );
return true;
}
}
}