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UserspaceEmulator: Add support for shared buffers (shbuf)

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We track these separately from regular mmap() regions, as they have
slightly different behaviors.
This commit is contained in:
Andreas Kling 2020-07-15 17:32:46 +02:00
parent 0ce4d3e942
commit 2da44dba44
7 changed files with 312 additions and 13 deletions
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7
DevTools/UserspaceEmulator/SoftMMU.h
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@ -26,6 +26,7 @@
#pragma once
#include <AK/HashMap.h>
#include <AK/NonnullOwnPtrVector.h>
#include <AK/OwnPtr.h>
#include <AK/Types.h>
@ -33,6 +34,8 @@
namespace UserspaceEmulator {
class SharedBufferRegion;
class SoftMMU {
public:
class Region {
@ -54,6 +57,7 @@ public:
virtual u32 read32(u32 offset) = 0;
virtual u8* cacheable_ptr([[maybe_unused]] u32 offset) { return nullptr; }
virtual bool is_shared_buffer() const { return false; }
protected:
Region(u32 base, u32 size)
@ -86,9 +90,12 @@ public:
void copy_from_vm(void* destination, const FlatPtr source, size_t);
ByteBuffer copy_buffer_from_vm(const FlatPtr source, size_t);
SharedBufferRegion* shbuf_region(int shbuf_id);
private:
OwnPtr<Region> m_tls_region;
NonnullOwnPtrVector<Region> m_regions;
HashMap<int, Region*> m_shbuf_regions;
};
}