honeycrisp/unimem/experiments/dext_iosurface_pa/dext/CybMemDriver.iig

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/*
 * CybMemDriver.iig -- DriverKit Interface Definition
 *
 * IOUserClient subclass that receives an IOSurface-backed VA range
 * from userspace, wraps it via CreateMemoryDescriptorFromClient,
 * resolves to physical/IOVA segments via IODMACommand, returns PA list.
 *
 * PATH 2 experiment: IOSurface alloc -> DEXT reads physical addresses
 */

#ifndef CybMemDriver_h
#define CybMemDriver_h

#include <Availability.h>
#include <DriverKit/IOUserClient.iig>
#include <DriverKit/IODMACommand.iig>
#include <DriverKit/IOBufferMemoryDescriptor.iig>

enum {
    kCybMemMethodResolvePA = 0,
    kCybMemMethodCount     = 1,
};

#define CYBMEM_MAX_SEGMENTS 32

struct CybMemInput {
    uint64_t client_va;      // IOSurface base address in client address space
    uint64_t byte_length;    // IOSurface allocation size
    uint32_t surface_id;     // IOSurfaceGetID (for logging)
    uint32_t _pad0;
};

struct CybMemPhysSegment {
    uint64_t address;
    uint64_t length;
};

struct CybMemOutput {
    uint32_t num_segments;
    uint32_t flags;
    uint64_t total_length;
    struct CybMemPhysSegment segments[CYBMEM_MAX_SEGMENTS];
};

class CybMemDriver : public IOUserClient
{
public:
    virtual bool init() override;
    virtual void free() override;
    virtual kern_return_t Start(IOService * provider) override;
    virtual kern_return_t Stop(IOService * provider) override;

    virtual kern_return_t ExternalMethod(
        uint64_t                            selector,
        IOUserClientMethodArguments       * arguments,
        const IOUserClientMethodDispatch  * dispatch,
        OSObject                          * target,
        void                              * reference) override;

    virtual kern_return_t CopyClientMemoryForType(
        uint64_t                type,
        uint64_t              * options,
        IOMemoryDescriptor   ** memory) override;
};

#endif

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