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Kernel: Change Region allocation helpers

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We now can create a cacheable Region, so when map() is called, if a
Region is cacheable then all the virtual memory space being allocated
to it will be marked as not cache disabled.

In addition to that, OS components can create a Region that will be
mapped to a specific physical address by using the appropriate helper
method.
This commit is contained in:
Liav A 2020-01-09 23:29:31 +02:00 • committed by Andreas Kling
parent b913e30011
commit d2b41010c5
7 changed files with 77 additions and 56 deletions
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19
Kernel/VM/Region.h
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@ -26,11 +26,11 @@ public:
Execute = 4,
};
static NonnullOwnPtr<Region> create_user_accessible(const Range&, const StringView& name, u8 access);
static NonnullOwnPtr<Region> create_user_accessible(const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, const StringView& name, u8 access);
static NonnullOwnPtr<Region> create_user_accessible(const Range&, NonnullRefPtr<Inode>, const StringView& name, u8 access);
static NonnullOwnPtr<Region> create_kernel_only(const Range&, const StringView& name, u8 access);
static NonnullOwnPtr<Region> create_kernel_only(const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, const StringView& name, u8 access);
static NonnullOwnPtr<Region> create_user_accessible(const Range&, const StringView& name, u8 access, bool cacheable = true);
static NonnullOwnPtr<Region> create_user_accessible(const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, const StringView& name, u8 access, bool cacheable = true);
static NonnullOwnPtr<Region> create_user_accessible(const Range&, NonnullRefPtr<Inode>, const StringView& name, u8 access, bool cacheable = true);
static NonnullOwnPtr<Region> create_kernel_only(const Range&, const StringView& name, u8 access, bool cacheable = true);
static NonnullOwnPtr<Region> create_kernel_only(const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, const StringView& name, u8 access, bool cacheable = true);
~Region();
@ -40,6 +40,7 @@ public:
bool is_readable() const { return m_access & Access::Read; }
bool is_writable() const { return m_access & Access::Write; }
bool is_executable() const { return m_access & Access::Execute; }
bool is_cacheable() const { return m_cacheable; }
const String& name() const { return m_name; }
unsigned access() const { return m_access; }
@ -115,6 +116,7 @@ public:
void set_writable(bool b) { set_access_bit(Access::Write, b); }
void set_executable(bool b) { set_access_bit(Access::Execute, b); }
void set_page_directory(PageDirectory&);
void map(PageDirectory&);
enum class ShouldDeallocateVirtualMemoryRange {
No,
@ -130,9 +132,9 @@ public:
Region* m_prev { nullptr };
// NOTE: These are public so we can make<> them.
Region(const Range&, const String&, u8 access);
Region(const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, const String&, u8 access);
Region(const Range&, NonnullRefPtr<Inode>, const String&, u8 access);
Region(const Range&, const String&, u8 access, bool cacheable);
Region(const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, const String&, u8 access, bool cacheable);
Region(const Range&, NonnullRefPtr<Inode>, const String&, u8 access, bool cacheable);
private:
Bitmap& ensure_cow_map() const;
@ -159,6 +161,7 @@ private:
u8 m_access { 0 };
bool m_shared { false };
bool m_user_accessible { false };
bool m_cacheable { false };
bool m_stack { false };
bool m_mmap { false };
mutable OwnPtr<Bitmap> m_cow_map;