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Kernel: Use PAE to allow accessing all physical memory beyond 4GB

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We already use PAE for the NX bit, but this changes the PhysicalAddress
structure to be able to hold 64 bit physical addresses. This allows us
to use all the available physical memory.
This commit is contained in:
Tom 2021-07-06 21:35:15 -06:00 • committed by Andreas Kling
parent 658b41a06c
commit ad5d9d648b
7 changed files with 87 additions and 86 deletions
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26
Kernel/PhysicalAddress.h
View file

@ -9,26 +9,31 @@
#include <AK/Format.h>
#include <AK/Types.h>
typedef u64 PhysicalPtr;
typedef u64 PhysicalSize;
class PhysicalAddress {
public:
ALWAYS_INLINE static PhysicalPtr physical_page_base(PhysicalPtr page_address) { return page_address & ~(PhysicalPtr)0xfff; }
PhysicalAddress() = default;
explicit PhysicalAddress(FlatPtr address)
explicit PhysicalAddress(PhysicalPtr address)
: m_address(address)
{
}
[[nodiscard]] PhysicalAddress offset(FlatPtr o) const { return PhysicalAddress(m_address + o); }
[[nodiscard]] FlatPtr get() const { return m_address; }
void set(FlatPtr address) { m_address = address; }
void mask(FlatPtr m) { m_address &= m; }
[[nodiscard]] PhysicalAddress offset(PhysicalPtr o) const { return PhysicalAddress(m_address + o); }
[[nodiscard]] PhysicalPtr get() const { return m_address; }
void set(PhysicalPtr address) { m_address = address; }
void mask(PhysicalPtr m) { m_address &= m; }
[[nodiscard]] bool is_null() const { return m_address == 0; }
[[nodiscard]] u8* as_ptr() { return reinterpret_cast<u8*>(m_address); }
[[nodiscard]] const u8* as_ptr() const { return reinterpret_cast<const u8*>(m_address); }
[[nodiscard]] PhysicalAddress page_base() const { return PhysicalAddress(m_address & 0xfffff000); }
[[nodiscard]] FlatPtr offset_in_page() const { return PhysicalAddress(m_address & 0xfff).get(); }
[[nodiscard]] PhysicalAddress page_base() const { return PhysicalAddress(physical_page_base(m_address)); }
[[nodiscard]] PhysicalPtr offset_in_page() const { return PhysicalAddress(m_address & 0xfff).get(); }
bool operator==(const PhysicalAddress& other) const { return m_address == other.m_address; }
bool operator!=(const PhysicalAddress& other) const { return m_address != other.m_address; }
@ -38,13 +43,16 @@ public:
bool operator<=(const PhysicalAddress& other) const { return m_address <= other.m_address; }
private:
FlatPtr m_address { 0 };
PhysicalPtr m_address { 0 };
};
template<>
struct AK::Formatter<PhysicalAddress> : AK::Formatter<FormatString> {
void format(FormatBuilder& builder, PhysicalAddress value)
{
return AK::Formatter<FormatString>::format(builder, "P{}", value.as_ptr());
if constexpr (sizeof(PhysicalPtr) == sizeof(u64))
return AK::Formatter<FormatString>::format(builder, "P{:016x}", value.get());
else
return AK::Formatter<FormatString>::format(builder, "P{}", value.as_ptr());
}
};