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Kernel: Introduce the MemoryDevice

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This is a character device that is being used by the dmidecode utility.
We only allow to map the BIOS ROM area to userspace with this device.
This commit is contained in:
Liav A 2021-01-29 14:03:25 +02:00 • committed by Andreas Kling
parent df59b80e23
commit 5ab1864497
6 changed files with 235 additions and 0 deletions
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25
Kernel/VM/MemoryManager.h
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@ -85,6 +85,26 @@ struct UsedMemoryRange {
PhysicalAddress end;
};
struct ContiguousReservedMemoryRange {
PhysicalAddress start;
size_t length;
};
enum class PhysicalMemoryRangeType {
Usable = 0,
Reserved,
ACPI_Reclaimable,
ACPI_NVS,
BadMemory,
Unknown
};
struct PhysicalMemoryRange {
PhysicalMemoryRangeType type;
PhysicalAddress start;
size_t length;
};
const LogStream& operator<<(const LogStream& stream, const UsedMemoryRange& value);
#define MM Kernel::MemoryManager::the()
@ -187,11 +207,14 @@ public:
PageDirectory& kernel_page_directory() { return *m_kernel_page_directory; }
const Vector<UsedMemoryRange>& used_memory_ranges() { return m_used_memory_ranges; }
bool is_allowed_to_mmap_to_userspace(PhysicalAddress, const Range&) const;
private:
MemoryManager();
~MemoryManager();
void register_reserved_ranges();
enum class AccessSpace { Kernel,
User };
enum class AccessType { Read,
@ -245,6 +268,8 @@ private:
InlineLinkedList<Region> m_user_regions;
InlineLinkedList<Region> m_kernel_regions;
Vector<UsedMemoryRange> m_used_memory_ranges;
Vector<PhysicalMemoryRange> m_physical_memory_ranges;
Vector<ContiguousReservedMemoryRange> m_reserved_memory_ranges;
InlineLinkedList<VMObject> m_vmobjects;