52 lines
2.0 KiB
C++
52 lines
2.0 KiB
C++
#ifndef __CPAGEDIRECTORY_H__
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#define __CPAGEDIRECTORY_H__
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#include "types.h"
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extern "C" {
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#include "Tier0/paging.h"
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};
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// This is more-or less just a C++ wrapper for T_PAGING_ML4. For use for pure-kernel processes only
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// It implements the following address space, virtually:
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//
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// name | start | end | mapping
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// -------- -------------------- --------------------- ------------------------------------------------------------------
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// LOWMEM - 0x0000000000000000 - 0x0000000000100000 -> lower 1MiB of physical memory, common, fits in 1/2 of a Table
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// SCRATCH - 0xFFFFFFFF00000000 - 0xFFFFFFFF3FFFFFFF -> kernel scratch space & heap. 4GiB, common, fits in 1/1 of a Directory
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// STACK - 0xFFFFFFFF40000000 - 0xFFFFFFFF4FFFFFFF -> kernel stack, unique per ML4, 256MiB, fits in 1/16 of a Directory,
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// TEXT - 0xFFFFFFFF80000000 - 0xFFFFFFFF8xxxxxxx -> kernel code physical location and the temp page, common, fits in x/16 of a Directory
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namespace cb {
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class CKernelML4 {
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private:
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// The paging direcotry structure
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T_PAGING_ML4 *m_Directory;
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bool m_ShouldFreeML4;
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// allocator and destructor for segments
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void *(*m_SegmentAllocator)(u64);
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void (*m_SegmentDestructor)(void *);
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// kernel stack segment physical memory
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u64 m_StackStartPhysical;
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u64 m_StackSize;
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// static pointers to common areas
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static T_PAGING_TAB *m_LOWMEM;
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static u64 m_LOWMEM_Physical;
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static T_PAGING_DIR *m_SCRATCH;
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static u64 m_SCRATCH_Physical;
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static T_PAGING_DIR *m_TEXT;
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static u64 m_TEXT_Physical;
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public:
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static void PopulateCommonPointers(void);
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// Creates a new page directory for a kernel task, with new stack and other internal stuff
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CKernelML4(void);
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// Destroys the structures and frees the segments, if needed
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~CKernelML4(void);
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};
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};
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#endif
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