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    unative_t priv;
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    unative_t priv;
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    /** Data passed from/to userspace. */
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    /** Data passed from/to userspace. */
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    ipc_data_t data;
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    ipc_data_t data;
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    /** Buffer for IPC_M_DATA_SEND. */
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    /** Buffer for IPC_M_DATA_WRITE and IPC_M_DATA_READ. */
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    uint8_t *buffer;
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    uint8_t *buffer;
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} call_t;
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} call_t;
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extern void ipc_init(void);
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extern void ipc_init(void);
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extern call_t * ipc_wait_for_call(answerbox_t *box, uint32_t usec, int flags);
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extern call_t * ipc_wait_for_call(answerbox_t *box, uint32_t usec, int flags);