110 lines
2.8 KiB
C++
110 lines
2.8 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) 2010-2017 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 Affero General Public License version 3.
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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/thread.h>
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/* base-internal includes */
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#include <base/internal/stack_area.h>
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#include <base/internal/globals.h>
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/**
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* Region-map 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_region_map : public Genode::Region_map
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{
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public:
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Stack_area_region_map()
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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, Genode::size_t size,
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Genode::off_t, bool, Local_addr local_addr, bool,
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bool) override
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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) override
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{
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Genode::warning("stack area detach from ", (void*)local_addr,
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" - not implemented");
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}
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void fault_handler(Genode::Signal_context_capability) override { }
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State state() override { return State(); }
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Genode::Dataspace_capability dataspace() override {
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return Genode::Dataspace_capability(); }
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};
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struct Stack_area_ram_allocator : Genode::Ram_allocator
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{
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Genode::Ram_dataspace_capability alloc(Genode::size_t,
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Genode::Cache_attribute) override {
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return Genode::Ram_dataspace_capability(); }
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void free(Genode::Ram_dataspace_capability) override { }
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Genode::size_t dataspace_size(Genode::Ram_dataspace_capability) const override { 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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Region_map *env_stack_area_region_map;
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Ram_allocator *env_stack_area_ram_allocator;
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void init_stack_area()
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{
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static Stack_area_region_map rm_inst;
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env_stack_area_region_map = &rm_inst;
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static Stack_area_ram_allocator ram_inst;
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env_stack_area_ram_allocator = &ram_inst;
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}
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}
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