93 lines
2.4 KiB
C++
93 lines
2.4 KiB
C++
/*
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* \brief Fiasco.OC-specific implementation of the IO_MEM session interface
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* \author Christian Helmuth
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* \author Stefan Kalkowski
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* \date 2006-08-28
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*/
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/*
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* Copyright (C) 2006-2012 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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/* core includes */
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#include <platform.h>
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#include <util.h>
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#include <io_mem_session_component.h>
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/* Fiasco includes */
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namespace Fiasco {
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#include <l4/sys/ipc.h>
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#include <l4/sigma0/sigma0.h>
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}
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using namespace Genode;
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void Io_mem_session_component::_unmap_local(addr_t base, size_t size)
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{
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platform()->region_alloc()->free(reinterpret_cast<void *>(base));
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}
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static inline bool can_use_super_page(addr_t base, size_t size)
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{
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return (base & (get_super_page_size() - 1)) == 0
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&& (size >= get_super_page_size());
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}
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addr_t Io_mem_session_component::_map_local(addr_t base, size_t size)
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{
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using namespace Fiasco;
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/* align large I/O dataspaces on a super-page boundary within core */
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size_t alignment = (size >= get_super_page_size()) ? get_super_page_size_log2()
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: get_page_size_log2();
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/* find appropriate region for mapping */
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void *local_base = 0;
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if (!platform()->region_alloc()->alloc_aligned(size, &local_base, alignment))
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return 0;
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/* call sigma0 for I/O region */
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unsigned offset = 0;
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while (size) {
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/* FIXME what about caching demands? */
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/* FIXME what about read / write? */
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l4_utcb_mr()->mr[0] = SIGMA0_REQ_FPAGE_IOMEM;
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size_t page_size_log2 = get_page_size_log2();
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if (can_use_super_page(base + offset, size))
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page_size_log2 = get_super_page_size_log2();
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l4_utcb_mr()->mr[1] = l4_fpage(base + offset,
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page_size_log2, L4_FPAGE_RWX).raw;
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/* open receive window for mapping */
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l4_utcb_br()->bdr = 0;
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l4_utcb_br()->br[0] = L4_ITEM_MAP;
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l4_utcb_br()->br[1] = l4_fpage((addr_t)local_base + offset,
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page_size_log2, L4_FPAGE_RWX).raw;
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l4_msgtag_t tag = l4_msgtag(L4_PROTO_SIGMA0, 2, 0, 0);
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tag = l4_ipc_call(L4_BASE_PAGER_CAP, l4_utcb(), tag, L4_IPC_NEVER);
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if (l4_ipc_error(tag, l4_utcb())) {
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PERR("Ipc error %ld", l4_ipc_error(tag, l4_utcb()));
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return 0;
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}
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if (l4_msgtag_items(tag) < 1) {
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PERR("Got no mapping!");
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return 0;
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}
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offset += 1 << page_size_log2;
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size -= 1 << page_size_log2;
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}
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return (addr_t)local_base;
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}
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