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This patch integrates three region maps into each PD session to reduce the session overhead and to simplify the PD creation procedure. Please refer to the issue cited below for an elaborative discussion. Note the API change: With this patch, the semantics of core's RM service have changed. Now, the service is merely a tool for creating and destroying managed dataspaces, which are rarely needed. Regular components no longer need a RM session. For this reason, the corresponding argument for the 'Process' and 'Child' constructors has been removed. The former interface of the 'Rm_session' is not named 'Region_map'. As a minor refinement, the 'Fault_type' enum values are now part of the 'Region_map::State' struct. Issue #1938
84 lines
2.0 KiB
C++
84 lines
2.0 KiB
C++
/*
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* \brief Linux-specific definitions and utilities for the stack area
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* \author Christian Helmuth
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* \date 2013-09-26
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*/
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/*
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* Copyright (C) 2010-2013 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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#ifndef _INCLUDE__BASE__INTERNAL__STACK_AREA_H_
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#define _INCLUDE__BASE__INTERNAL__STACK_AREA_H_
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/* Genode includes */
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#include <base/thread.h>
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#include <rm_session/rm_session.h>
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#include <linux_syscalls.h>
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/* Linux includes */
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#include <sys/mman.h>
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extern Genode::addr_t _stack_area_start;
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namespace Genode {
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/**
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* Stack area base address
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*
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* Please update platform-specific files after changing these
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* functions, e.g., 'base-linux/src/ld/stack_area.*.ld'.
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*/
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static addr_t stack_area_virtual_base() {
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return align_addr((addr_t)&_stack_area_start, 20); }
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static constexpr addr_t stack_area_virtual_size() { return 0x10000000UL; }
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static constexpr addr_t stack_virtual_size() { return 0x00100000UL; }
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}
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static inline void flush_stack_area()
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{
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using namespace Genode;
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void * const base = (void *)stack_area_virtual_base();
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size_t const size = stack_area_virtual_size();
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int ret;
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if ((ret = lx_munmap(base, size)) < 0) {
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PERR("%s: failed ret=%d", __func__, ret);
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throw Region_map::Region_conflict();
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}
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}
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static inline Genode::addr_t reserve_stack_area()
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{
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using namespace Genode;
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int const flags = MAP_ANONYMOUS | MAP_PRIVATE;
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int const prot = PROT_NONE;
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size_t const size = stack_area_virtual_size();
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void * const addr_in = (void *)stack_area_virtual_base();
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void * const addr_out = lx_mmap(addr_in, size, prot, flags, -1, 0);
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/* reserve at local address failed - unmap incorrect mapping */
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if (addr_in != addr_out) {
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lx_munmap((void *)addr_out, size);
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PERR("%s: failed addr_in=%p addr_out=%p ret=%ld)", __func__,
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addr_in, addr_out, (long)addr_out);
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throw Region_map::Region_conflict();
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}
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return (addr_t) addr_out;
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}
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#endif /* _INCLUDE__BASE__INTERNAL__STACK_AREA_H_ */
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