265 lines
6.9 KiB
C++
265 lines
6.9 KiB
C++
/*
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* \brief Framebuffer driver front end
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* \author Norman Feske
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* \author Christian Helmuth
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* \author Sebastian Sumpf
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* \date 2007-09-11
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*/
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/*
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* Copyright (C) 2007-2013 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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/* Genode */
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#include <base/env.h>
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#include <base/sleep.h>
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#include <base/rpc_server.h>
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#include <root/component.h>
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#include <cap_session/connection.h>
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#include <framebuffer_session/framebuffer_session.h>
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#include <rom_session/connection.h>
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#include <util/xml_node.h>
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#include <dataspace/client.h>
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#include <blit/blit.h>
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#include <os/config.h>
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/* Local */
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#include "framebuffer.h"
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using namespace Genode;
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/***************
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** Utilities **
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***************/
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/**
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* Determine session argument value based on config file and session arguments
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*
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* \param attr_name attribute name of config node
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* \param args session argument string
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* \param arg_name argument name
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* \param default default session argument value if value is neither
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* specified in config node nor in session arguments
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*/
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unsigned long session_arg(const char *attr_name, const char *args,
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const char *arg_name, unsigned long default_value)
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{
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unsigned long result = default_value;
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/* try to obtain value from config file */
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try { Genode::config()->xml_node().attribute(attr_name).value(&result); }
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catch (...) { }
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/* check session argument to override value from config file */
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result = Arg_string::find_arg(args, arg_name).ulong_value(result);
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return result;
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}
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bool config_attribute(const char *attr_name)
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{
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bool result = false;
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try {
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result = Genode::config()->xml_node().attribute(attr_name).has_value("yes"); }
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catch (...) {}
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return result;
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}
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/***********************************************
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** Implementation of the framebuffer service **
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***********************************************/
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namespace Framebuffer {
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class Session_component : public Genode::Rpc_object<Session>
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{
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private:
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unsigned _scr_width, _scr_height, _scr_mode;
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bool _buffered;
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/* dataspace uses a back buffer (if '_buffered' is true) */
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Genode::Ram_dataspace_capability _bb_ds;
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void *_bb_addr;
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/* dataspace of physical frame buffer */
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Genode::Dataspace_capability _fb_ds;
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void *_fb_addr;
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Genode::Signal_context_capability _sync_sigh;
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void _refresh_buffered(int x, int y, int w, int h)
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{
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/* clip specified coordinates against screen boundaries */
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int x2 = min(x + w - 1, (int)_scr_width - 1),
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y2 = min(y + h - 1, (int)_scr_height - 1);
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int x1 = max(x, 0),
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y1 = max(y, 0);
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if (x1 > x2 || y1 > y2) return;
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/* determine bytes per pixel */
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int bypp = 0;
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if (_scr_mode == 16) bypp = 2;
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if (!bypp) return;
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/* copy pixels from back buffer to physical frame buffer */
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char *src = (char *)_bb_addr + bypp*(_scr_width*y1 + x1),
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*dst = (char *)_fb_addr + bypp*(_scr_width*y1 + x1);
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blit(src, bypp*_scr_width, dst, bypp*_scr_width,
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bypp*(x2 - x1 + 1), y2 - y1 + 1);
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}
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public:
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/**
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* Constructor
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*/
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Session_component(unsigned scr_width, unsigned scr_height, unsigned scr_mode,
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Genode::Dataspace_capability fb_ds, bool buffered)
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:
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_scr_width(scr_width), _scr_height(scr_height), _scr_mode(scr_mode),
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_buffered(buffered), _fb_ds(fb_ds)
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{
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if (!_buffered) return;
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if (scr_mode != 16) {
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PWRN("buffered mode not supported for mode %d", (int)scr_mode);
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_buffered = false;
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}
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size_t buf_size = scr_width*scr_height*scr_mode/8;
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try { _bb_ds = Genode::env()->ram_session()->alloc(buf_size); }
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catch (...) {
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PWRN("could not allocate back buffer, disabled buffered output");
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_buffered = false;
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}
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PDBG("use buf size %zd", buf_size);
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if (_buffered && _bb_ds.valid()) {
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_bb_addr = Genode::env()->rm_session()->attach(_bb_ds);
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_fb_addr = Genode::env()->rm_session()->attach(_fb_ds);
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}
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if (_buffered)
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PINF("using buffered output");
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}
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/**
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* Destructor
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*/
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~Session_component()
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{
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if (!_buffered) return;
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Genode::env()->rm_session()->detach(_bb_addr);
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Genode::env()->ram_session()->free(_bb_ds);
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Genode::env()->rm_session()->detach(_fb_addr);
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}
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/***********************************
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** Framebuffer session interface **
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***********************************/
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Dataspace_capability dataspace() override {
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return _buffered ? Dataspace_capability(_bb_ds)
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: Dataspace_capability(_fb_ds); }
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Mode mode() const override
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{
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return Mode(_scr_width, _scr_height,
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_scr_mode == 16 ? Mode::RGB565 : Mode::INVALID);
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}
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void mode_sigh(Genode::Signal_context_capability) override { }
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void sync_sigh(Genode::Signal_context_capability sigh) override
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{
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_sync_sigh = sigh;
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}
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void refresh(int x, int y, int w, int h) override
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{
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if (_buffered)
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_refresh_buffered(x, y, w, h);
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if (_sync_sigh.valid())
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Signal_transmitter(_sync_sigh).submit();
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}
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};
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/**
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* Shortcut for single-client root component
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*/
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typedef Genode::Root_component<Session_component, Genode::Single_client> Root_component;
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class Root : public Root_component
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{
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protected:
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Session_component *_create_session(const char *args) override
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{
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unsigned long scr_width = session_arg("width", args, "fb_width", 0),
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scr_height = session_arg("height", args, "fb_height", 0),
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scr_mode = session_arg("depth", args, "fb_mode", 16);
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bool buffered = config_attribute("buffered");
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if (Framebuffer_drv::set_mode(scr_width, scr_height, scr_mode) != 0) {
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PWRN("Could not set vesa mode %lux%lu@%lu", scr_width, scr_height,
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scr_mode);
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throw Root::Invalid_args();
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}
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printf("Using video mode: %lu x %lu x %lu\n", scr_width, scr_height, scr_mode);
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return new (md_alloc()) Session_component(scr_width, scr_height, scr_mode,
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Framebuffer_drv::hw_framebuffer(),
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buffered);
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}
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public:
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Root(Rpc_entrypoint *session_ep, Allocator *md_alloc)
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: Root_component(session_ep, md_alloc) { }
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};
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}
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int main(int argc, char **argv)
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{
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/* We need to create capabilities for sessions. Therefore, we request the
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* CAP service. */
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static Cap_connection cap;
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/* initialize server entry point */
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enum { STACK_SIZE = 8*1024 };
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static Rpc_entrypoint ep(&cap, STACK_SIZE, "vesa_ep");
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/* init driver back end */
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if (Framebuffer_drv::init()) {
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PERR("H/W driver init failed");
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return 3;
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}
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/* entry point serving framebuffer root interface */
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static Framebuffer::Root fb_root(&ep, env()->heap());
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/* tell parent about the service */
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env()->parent()->announce(ep.manage(&fb_root));
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/* main's done - go to sleep */
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sleep_forever();
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return 0;
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}
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