119 lines
2.7 KiB
C++
119 lines
2.7 KiB
C++
/*
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* \brief UTCB definition
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2012-01-02
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*/
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/*
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* Copyright (C) 2016 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__BASE__INTERNAL__NATIVE_UTCB_H_
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#define _INCLUDE__BASE__INTERNAL__NATIVE_UTCB_H_
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/* Genode includes */
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#include <base/stdint.h>
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#include <base/ipc_msgbuf.h>
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/* base-internal includes */
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#include <base/internal/page_size.h>
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/* kernel includes */
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#include <kernel/interface.h>
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namespace Genode { struct Native_utcb; }
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class Genode::Native_utcb
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{
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public:
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enum { MAX_CAP_ARGS = Msgbuf_base::MAX_CAP_ARGS};
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enum Offsets { THREAD_MYSELF, PARENT, UTCB_DATASPACE };
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private:
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Kernel::capid_t _caps[MAX_CAP_ARGS]; /* capability buffer */
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size_t _cap_cnt; /* capability counter */
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size_t _size; /* bytes to transfer */
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uint8_t _buf[get_page_size() - sizeof(_caps) -
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sizeof(_cap_cnt) - sizeof(_size)];
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public:
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Native_utcb& operator= (const Native_utcb &o)
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{
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_cap_cnt = 0;
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_size = o._size;
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memcpy(_buf, o._buf, _size);
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return *this;
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}
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/**
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* Set the destination capability id (server object identity)
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*/
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void destination(Kernel::capid_t id) {
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*reinterpret_cast<long*>(_buf) = id; }
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/**
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* Return the count of capabilities in the UTCB
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*/
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size_t cap_cnt() { return _cap_cnt; }
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/**
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* Set the count of capabilities in the UTCB
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*/
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void cap_cnt(size_t cnt) { _cap_cnt = cnt; }
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/**
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* Return the start address of the payload data
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*/
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void const * base() const { return &_buf; }
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/**
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* Copy data from the message buffer 'o' to this UTCB
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*/
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void copy_from(Msgbuf_base &o, size_t size)
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{
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_size = size;
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_cap_cnt = o._snd_cap_cnt;
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for (unsigned i = 0; i < _cap_cnt; i++)
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_caps[i] = o._caps[i].dst();
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memcpy(_buf, o.buf, min(_size, o._size));
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}
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/**
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* Copy data from this UTCB to the message buffer 'o'
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*/
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void copy_to(Msgbuf_base &o)
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{
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o._snd_cap_cnt = _cap_cnt;
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for (unsigned i = 0; i < _cap_cnt; i++) {
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o._caps[i] = _caps[i];
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if (o._caps[i].valid()) Kernel::ack_cap(o._caps[i].dst());
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}
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memcpy(o.buf, _buf, min(_size, o._size));
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}
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/**
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* Return the capability id at index 'i'
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*/
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Kernel::capid_t cap_get(unsigned i) {
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return (i < _cap_cnt) ? _caps[i] : Kernel::cap_id_invalid(); }
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/**
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* Set the capability id 'cap_id' at the next index
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*/
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void cap_add(Kernel::capid_t cap_id) {
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if (_cap_cnt < MAX_CAP_ARGS) _caps[_cap_cnt++] = cap_id; }
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};
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#endif /* _INCLUDE__BASE__INTERNAL__NATIVE_UTCB_H_ */
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