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67 lines
2.3 KiB
67 lines
2.3 KiB
// Copyright 2020 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include "base/Stream.h"
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#include <inttypes.h>
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static const uint32_t kDmaBufSizeMB = 32;
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// GOLDFISH DMA
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//
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// Goldfish DMA is an extension to the pipe device
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// and is designed to facilitate high-speed RAM->RAM
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// transfers from guest to host.
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//
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// See docs/GOLDFISH-VIRTUAL-HARDWARE.txt and
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// docs/ANDROID-QEMU-PIPE.txt
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//
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// for more details.
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// Host / virtual device interface:
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typedef struct {
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// add_buffer():
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// Tell us that there is a physically-contiguous buffer in the guest
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// starting at |guest_paddr|. This should be used upon allocation
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// of the DMA buffer in the ugest.
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void (*add_buffer)(void* pipe, uint64_t guest_paddr, uint64_t sz);
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// remove_buffer():
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// Tell us that we don't care about tracking this buffer anymore.
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// This should usually be used when the DMA buffer has been freed
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// in the ugest.
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void (*remove_buffer)(uint64_t guest_paddr);
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// get_host_addr():
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// Obtain a pointer to guest physical memory that is usable as
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// as host void*.
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void* (*get_host_addr)(uint64_t guest_paddr);
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// invalidate_host_mappings():
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// Sometimes (say, on snapshot save/load) we may need to re-map
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// the guest DMA buffers so to regain access to them.
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// This function tells our map of DMA buffers to remap the buffers
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// next time they are used.
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void (*invalidate_host_mappings)(void);
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// unlock():
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// Unlocks the buffer at |guest_paddr| to signal the guest
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// that we are done writing it.
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void (*unlock)(uint64_t guest_paddr);
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// reset_host_mappings();
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// Not only invalidates the mappings, but also removes them from the record.
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void (*reset_host_mappings)(void);
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// For snapshots.
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void (*save_mappings)(android::base::Stream* stream);
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void (*load_mappings)(android::base::Stream* stream);
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} GoldfishDmaOps;
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extern const GoldfishDmaOps android_goldfish_dma_ops;
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