kernel/vm/include/vm/vm_object_physical.h

// Copyright 2016 The Fuchsia Authors
//
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT

#pragma once

#include <assert.h>
#include <fbl/array.h>
#include <fbl/canary.h>
#include <fbl/intrusive_double_list.h>
#include <fbl/macros.h>
#include <fbl/ref_counted.h>
#include <fbl/ref_ptr.h>
#include <kernel/mutex.h>
#include <lib/user_copy/user_ptr.h>
#include <list.h>
#include <stdint.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <zircon/thread_annotations.h>
#include <zircon/types.h>

// VMO representing a physical range of memory
class VmObjectPhysical final : public VmObject {
public:
    static zx_status_t Create(paddr_t base, uint64_t size, fbl::RefPtr<VmObject>* vmo);

    bool is_contiguous() const override { return true; }

    uint64_t size() const override { return size_; }

    zx_status_t Lookup(uint64_t offset, uint64_t len,
                       vmo_lookup_fn_t lookup_fn, void* context) override;

    void Dump(uint depth, bool verbose) override;

    zx_status_t GetPageLocked(uint64_t offset, uint pf_flags, list_node* free_list,
                              PageRequest* page_request,
                              vm_page_t**, paddr_t* pa) override TA_REQ(lock_);

    uint32_t GetMappingCachePolicy() const override;
    zx_status_t SetMappingCachePolicy(const uint32_t cache_policy) override;

private:
    // private constructor (use Create())
    VmObjectPhysical(paddr_t base, uint64_t size);

    // private destructor, only called from refptr
    ~VmObjectPhysical() override;
    friend fbl::RefPtr<VmObjectPhysical>;

    DISALLOW_COPY_ASSIGN_AND_MOVE(VmObjectPhysical);

    // members
    const uint64_t size_ = 0;
    const paddr_t base_ = 0;
    uint32_t mapping_cache_flags_ TA_GUARDED(lock_) = 0;
};