ed2e610178
Use virtual regions for memory used during core initialization behind context area. Enables us to start Vancouver VMs up to 1280 MiB, which requires large virtual regions of contiguous aligned memory. Exclude used virtual regions of echo and of pager thread in core.
88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
/*
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* \brief Echo implementation
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* \author Norman Feske
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* \author Alexander Boettcher
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* \date 2010-01-19
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*/
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/*
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* Copyright (C) 2010-2012 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 includes */
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#include <base/cap_sel_alloc.h>
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/* Core includes */
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#include <platform_pd.h>
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/* local includes */
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#include <echo.h>
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enum {
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ECHO_STACK_SIZE = 1024,
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ECHO_CPU_NO = 0,
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ECHO_GLOBAL = false,
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ECHO_EXC_BASE = 0
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};
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inline void *echo_stack_top()
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{
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static char echo_stack[ECHO_STACK_SIZE];
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return &echo_stack[ECHO_STACK_SIZE - sizeof(long)];
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}
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/**
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* IDC handler for the echo portal, executed by the echo EC
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*/
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static void echo_reply()
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{
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/* collect map information from calling thread, sent as 3 words */
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Nova::Crd snd_rcv(echo()->utcb()->msg[0]);
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Nova::mword_t offset = echo()->utcb()->msg[1];
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bool kern_pd = echo()->utcb()->msg[2];
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/* reset message transfer descriptor */
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echo()->utcb()->set_msg_word(0);
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/* append capability-range as message-transfer item */
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bool res = echo()->utcb()->append_item(snd_rcv, offset, kern_pd);
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/* set return code, 0 means failure */
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echo()->utcb()->msg[0] = res;
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echo()->utcb()->items += 1;
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/* during reply the mapping will be established */
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Nova::reply(echo_stack_top());
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}
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Echo::Echo(Genode::addr_t utcb_addr)
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:
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_ec_sel(Genode::cap_selector_allocator()->alloc()),
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_pt_sel(Genode::cap_selector_allocator()->alloc()),
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_utcb((Nova::Utcb *)utcb_addr)
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{
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using namespace Nova;
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/* create echo EC */
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Genode::addr_t pd_sel = Genode::Platform_pd::pd_core_sel();
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uint8_t res = create_ec(_ec_sel, pd_sel, ECHO_CPU_NO, utcb_addr,
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(mword_t)echo_stack_top(), ECHO_EXC_BASE, ECHO_GLOBAL);
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/* make error condition visible by raising an unhandled page fault */
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if (res) { ((void (*)())(res*0x10000UL))(); }
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/* set up echo portal to ourself */
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res = create_pt(_pt_sel, pd_sel, _ec_sel, Mtd(0), (mword_t)echo_reply);
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if (res) { ((void (*)())(res*0x10001UL))(); }
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/* echo thread doesn't receive anything, it transfers items during reply */
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utcb()->crd_rcv = utcb()->crd_xlt = 0;
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}
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Echo *echo() { static Echo inst(Echo::ECHO_UTCB_ADDR); return &inst; }
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