184 lines
4.0 KiB
C++
184 lines
4.0 KiB
C++
/*
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* \brief Basic Genode types
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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) 2012-2015 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__NATIVE_TYPES_H_
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#define _INCLUDE__BASE__NATIVE_TYPES_H_
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/* Genode includes */
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#include <kernel/log.h>
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#include <base/native_capability.h>
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#include <base/ipc_msgbuf.h>
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#include <base/printf.h>
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namespace Genode
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{
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class Platform_thread;
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class Native_thread;
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using Native_thread_id = Kernel::capid_t;
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typedef int Native_connection_state;
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/**
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* Information that a thread creator hands out to a new thread
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*/
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class Start_info;
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/**
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* Coherent address region
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*/
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struct Native_region;
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struct Native_pd_args { };
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/**
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* Get the the minimal supported page-size log 2
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*/
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constexpr size_t get_page_size_log2() { return 12; }
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/**
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* Get the the minimal supported page-size
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*/
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constexpr size_t get_page_size() { return 1 << get_page_size_log2(); }
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/**
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* Memory region that is exclusive to every thread and known by the kernel
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*/
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class Native_utcb;
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}
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struct Genode::Native_thread
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{
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Platform_thread * platform_thread;
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Native_capability cap;
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};
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/**
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* Coherent address region
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*/
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struct Genode::Native_region
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{
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addr_t base;
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size_t size;
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};
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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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namespace Genode
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{
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static constexpr addr_t VIRT_ADDR_SPACE_START = 0x1000;
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static constexpr size_t VIRT_ADDR_SPACE_SIZE = 0xfffee000;
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/**
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* The main thread's UTCB, used during bootstrap of the main thread before it
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* allocates its stack area, needs to be outside the virtual memory area
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* controlled by the RM session, because it is needed before the main
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* thread can access its RM session.
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*/
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static constexpr Native_utcb * utcb_main_thread() {
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return (Native_utcb *) (VIRT_ADDR_SPACE_START + VIRT_ADDR_SPACE_SIZE); }
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}
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#endif /* _INCLUDE__BASE__NATIVE_TYPES_H_ */
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