149 lines
3.7 KiB
C++
149 lines
3.7 KiB
C++
/*
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* \brief 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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/* local includes */
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#include <platform.h>
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#include <map_local.h>
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#include <dataspace_component.h>
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using namespace Genode;
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/**
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* Pointer to dataspace used to hold core contexts
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*/
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enum { MAX_CORE_CONTEXTS = 256 };
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static Dataspace_component *context_ds[MAX_CORE_CONTEXTS];
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/**
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* Region-manager session for allocating thread contexts
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*
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* This class corresponds to the managed dataspace that is normally
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* used for organizing thread contexts with the thread context area.
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* It "emulates" the sub address space by adjusting the local address
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* argument to 'attach' with the offset of the thread context area.
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*/
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class Context_area_rm_session : public Rm_session
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{
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public:
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/**
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* Attach backing store to thread-context area
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*/
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Local_addr attach(Dataspace_capability ds_cap,
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size_t size, off_t offset,
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bool use_local_addr, Local_addr local_addr, bool)
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{
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Dataspace_component *ds = context_ds[ds_cap.local_name()];
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if (!ds) {
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PERR("dataspace for core context does not exist");
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return 0;
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}
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if (!map_local(ds->phys_addr(),
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(addr_t)local_addr + Native_config::context_area_virtual_base(),
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ds->size() >> get_page_size_log2()))
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return 0;
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return local_addr;
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}
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void detach(Local_addr) { }
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Pager_capability add_client(Thread_capability) {
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return Pager_capability(); }
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void fault_handler(Signal_context_capability) { }
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State state() { return State(); }
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Dataspace_capability dataspace() { return Dataspace_capability(); }
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};
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class Context_area_ram_session : public Ram_session
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{
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public:
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Ram_dataspace_capability alloc(size_t size, bool)
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{
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/* find free context */
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unsigned i;
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for (i = 0; i < MAX_CORE_CONTEXTS; i++)
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if (!context_ds[i])
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break;
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if (i == MAX_CORE_CONTEXTS) {
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PERR("maximum number of core contexts (%d) reached", MAX_CORE_CONTEXTS);
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return Ram_dataspace_capability();
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}
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/* allocate physical memory */
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size = round_page(size);
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void *phys_base;
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if (platform_specific()->ram_alloc()->alloc_aligned(size, &phys_base,
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get_page_size_log2()).is_error()) {
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PERR("could not allocate backing store for new context");
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return Ram_dataspace_capability();
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}
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context_ds[i] = new (platform()->core_mem_alloc())
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Dataspace_component(size, 0, (addr_t)phys_base, false, true, 0);
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/*
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* We do not manage the dataspace via an entrypoint because it will
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* only be used by the 'context_area_rm_session'. Therefore, we
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* construct a "capability" by hand using the context ID as local
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* name.
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*/
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Native_capability cap;
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return reinterpret_cap_cast<Ram_dataspace>(Native_capability(cap.dst(), i));
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}
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void free(Ram_dataspace_capability ds) { PDBG("not yet implemented"); }
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int ref_account(Ram_session_capability ram_session) { return 0; }
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int transfer_quota(Ram_session_capability ram_session, size_t amount) { 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 context-area RM and RAM session
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*/
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namespace Genode {
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Rm_session *env_context_area_rm_session()
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{
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static Context_area_rm_session inst;
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return &inst;
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}
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Ram_session *env_context_area_ram_session()
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{
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static Context_area_ram_session inst;
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return &inst;
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}
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}
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