121 lines
2.9 KiB
C++
121 lines
2.9 KiB
C++
/*
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* \brief Linux-specific support code for the thread API
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* \author Norman Feske
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* \date 2010-01-13
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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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/* Genode includes */
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#include <rm_session/rm_session.h>
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#include <ram_session/ram_session.h>
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#include <base/printf.h>
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#include <base/thread.h>
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/* base-internal includes */
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#include <base/internal/stack_area.h>
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/**
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* Region-manager session for allocating stacks
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*
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* This class corresponds to the managed dataspace that is normally used for
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* organizing stacks within the stack. It "emulates" the sub address space by
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* adjusting the local address argument to 'attach' with the offset of the
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* stack area.
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*/
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class Stack_area_rm_session : public Genode::Rm_session
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{
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public:
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Stack_area_rm_session()
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{
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flush_stack_area();
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reserve_stack_area();
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}
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/**
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* Attach backing store to stack area
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*/
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Local_addr attach(Genode::Dataspace_capability ds_cap,
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Genode::size_t size, Genode::off_t offset,
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bool use_local_addr, Local_addr local_addr,
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bool executable)
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{
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using namespace Genode;
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/* convert stack-area-relative to absolute virtual address */
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addr_t addr = (addr_t)local_addr + stack_area_virtual_base();
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/* use anonymous mmap for allocating stack backing store */
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int flags = MAP_FIXED | MAP_ANONYMOUS | MAP_PRIVATE;
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int prot = PROT_READ | PROT_WRITE;
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void *res = lx_mmap((void*)addr, size, prot, flags, -1, 0);
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if ((addr_t)res != addr)
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throw Region_conflict();
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return local_addr;
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}
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void detach(Local_addr local_addr) {
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PWRN("stack area detach from 0x%p - not implemented", (void *)local_addr); }
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Genode::Pager_capability add_client(Genode::Thread_capability) {
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return Genode::Pager_capability(); }
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void remove_client(Genode::Pager_capability) { }
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void fault_handler(Genode::Signal_context_capability) { }
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State state() { return State(); }
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Genode::Dataspace_capability dataspace() {
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return Genode::Dataspace_capability(); }
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};
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class Stack_area_ram_session : public Genode::Ram_session
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{
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public:
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Genode::Ram_dataspace_capability alloc(Genode::size_t size,
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Genode::Cache_attribute) {
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return Genode::Ram_dataspace_capability(); }
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void free(Genode::Ram_dataspace_capability) { }
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int ref_account(Genode::Ram_session_capability) { return 0; }
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int transfer_quota(Genode::Ram_session_capability, Genode::size_t) { return 0; }
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size_t quota() { return 0; }
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size_t used() { return 0; }
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};
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/**
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* Return single instance of the stack-area RM and RAM session
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*/
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namespace Genode {
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Rm_session *env_stack_area_rm_session()
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{
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static Stack_area_rm_session inst;
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return &inst;
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}
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Ram_session *env_stack_area_ram_session()
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{
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static Stack_area_ram_session inst;
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return &inst;
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}
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}
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