0bf642ff9a
Caller thread sends echo thread mapping information. Echo thread establish during reply the mappings. Fixes #248
151 lines
4.2 KiB
C++
151 lines
4.2 KiB
C++
/*
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* \brief NOVA-specific convenience functions
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* \author Norman Feske
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* \author Sebastian Sumpf
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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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#ifndef _NOVA_UTIL_H_
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#define _NOVA_UTIL_H_
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/* Genode includes */
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#include <base/printf.h>
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/* NOVA includes */
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#include <nova/syscalls.h>
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/* local includes */
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#include <echo.h>
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#include <util.h>
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enum { verbose_local_map = false };
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/**
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* Establish a one-to-one mapping
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*
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* \param utcb UTCB of the calling EC
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* \param src_crd capability range descriptor of source
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* resource to map locally
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* \param dst_crd capability range descriptor of mapping
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* target
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*
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* This functions sends a mapping from the calling EC to the echo EC.
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* In order to successfully transfer the mapping, we have to open a
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* corresponding receive window at the echo EC. We do this by poking
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* a receive-capability-range descriptor directly onto the echo UTCB.
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*/
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static int map_local(Nova::Utcb *utcb, Nova::Crd src_crd, Nova::Crd dst_crd,
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bool kern_pd = false)
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{
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/* open receive window at current EC */
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utcb->crd_rcv = dst_crd;
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/* tell echo thread what to map */
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utcb->msg[0] = src_crd.value();
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utcb->msg[1] = 0;
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utcb->msg[2] = kern_pd;
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utcb->set_msg_word(3);
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/* establish the mapping via a portal traversal during reply phase */
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Nova::uint8_t res = Nova::call(echo()->pt_sel());
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if (res != 0 || utcb->msg_words() != 1 || !utcb->msg[0]) {
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PERR("Failure - map_local 0x%lx:%lu:%u->0x%lx:%lu:%u - call result=%x utcb=%x:%lx !!!",
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src_crd.addr(), src_crd.order(), src_crd.type(),
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dst_crd.addr(), dst_crd.order(), dst_crd.type(),
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res, utcb->msg_words(), utcb->msg[0]);
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return res > 0 ? res : -1;
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}
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/* clear receive window */
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utcb->crd_rcv = 0;
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return 0;
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}
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static inline int unmap_local(Nova::Crd crd, bool self = true) {
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return Nova::revoke(crd, self); }
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inline int map_local_one_to_one(Nova::Utcb *utcb, Nova::Crd crd) {
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return map_local(utcb, crd, crd, true); }
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/**
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* Remap pages in the local address space
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*
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* \param utcb UTCB of the main thread
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* \param from_start physical source address
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* \param to_start local virtual destination address
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* \param num_pages number of pages to map
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*/
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inline int map_local(Nova::Utcb *utcb,
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Genode::addr_t from_start, Genode::addr_t to_start,
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Genode::size_t num_pages,
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bool kern_pd = false)
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{
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if (verbose_local_map)
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Genode::printf("::map_local: from %lx to %lx, %zd pages from kernel %u\n",
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from_start, to_start, num_pages, kern_pd);
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using namespace Nova;
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using namespace Genode;
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Rights const rwx(true, true, true);
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size_t const size = num_pages << get_page_size_log2();
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addr_t const from_end = from_start + size;
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addr_t const to_end = to_start + size;
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for (addr_t offset = 0; offset < size; ) {
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addr_t const from_curr = from_start + offset;
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addr_t const to_curr = to_start + offset;
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/*
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* The common alignment corresponds to the number of least significant
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* zero bits in both addresses.
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*/
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addr_t const common_bits = from_curr | to_curr;
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/*
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* Find highest clear bit in 'diff', starting from the least
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* significant candidate. We can skip all bits lower then
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* 'get_page_size_log2()' because they are not relevant as flexpage
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* size (and are always zero).
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*/
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size_t order = get_page_size_log2();
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for (; order < 32 && !(common_bits & (1 << order)); order++);
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/*
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* Look if flexpage fits into both 'from' and 'to' address range
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*/
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if (from_curr + (1 << order) > from_end)
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order = log2(from_end - from_curr);
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if (to_curr + (1 << order) > to_end)
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order = log2(to_end - to_curr);
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int const res = map_local(utcb,
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Mem_crd((from_curr >> 12), order - get_page_size_log2(), rwx),
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Mem_crd((to_curr >> 12), order - get_page_size_log2(), rwx),
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kern_pd);
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if (res) return res;
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/* advance offset by current flexpage size */
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offset += (1 << order);
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}
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return 0;
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}
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#endif /* _NOVA_UTIL_H_ */
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