153 lines
4.0 KiB
C++
153 lines
4.0 KiB
C++
/*
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* \brief Support code for the thread API
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* \author Norman Feske
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* \author Stefan Kalkowski
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* \date 2010-01-13
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*/
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/*
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* Copyright (C) 2010-2015 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/synced_allocator.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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#include <untyped_memory.h>
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/* base-internal includes */
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#include <base/internal/stack_area.h>
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using namespace Genode;
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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 with the stack area. In contrast to the ordinary
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* implementation, core's version does not split between allocation of memory
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* and virtual memory management. Due to the missing availability of "real"
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* dataspaces and capabilities refering to it without having an entrypoint in
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* place, the allocation of a dataspace has no effect, but the attachment of
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* the thereby "empty" dataspace is doing both: allocation and attachment.
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*/
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class Stack_area_rm_session : public Rm_session
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{
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private:
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using Ds_slab = Synced_allocator<Tslab<Dataspace_component,
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get_page_size()> >;
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Ds_slab _ds_slab { platform()->core_mem_alloc() };
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enum { verbose = false };
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public:
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/**
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* Allocate and attach on-the-fly backing store to the stack area
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*/
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Local_addr attach(Dataspace_capability ds_cap, /* ignored capability */
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size_t size, 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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size = round_page(size);
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/* allocate physical memory */
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Range_allocator &phys_alloc = *platform_specific()->ram_alloc();
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size_t const num_pages = size >> get_page_size_log2();
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addr_t const phys = Untyped_memory::alloc_pages(phys_alloc, num_pages);
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Untyped_memory::convert_to_page_frames(phys, num_pages);
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Dataspace_component *ds = new (&_ds_slab)
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Dataspace_component(size, 0, phys, CACHED, true, 0);
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if (!ds) {
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PERR("dataspace for core stack does not exist");
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return (addr_t)0;
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}
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addr_t const core_local_addr =
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stack_area_virtual_base() + (addr_t)local_addr;
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if (verbose)
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PDBG("core_local_addr = %lx, phys_addr = %lx, size = 0x%zx",
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core_local_addr, ds->phys_addr(), ds->size());
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if (!map_local(ds->phys_addr(), core_local_addr,
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ds->size() >> get_page_size_log2())) {
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PERR("could not map phys %lx at local %lx",
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ds->phys_addr(), core_local_addr);
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return (addr_t)0;
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}
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ds->assign_core_local_addr((void*)core_local_addr);
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return local_addr;
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}
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void detach(Local_addr local_addr) { PWRN("Not implemented!"); }
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Pager_capability add_client(Thread_capability) {
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return Pager_capability(); }
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void remove_client(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 Stack_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, Cache_attribute cached) {
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return reinterpret_cap_cast<Ram_dataspace>(Native_capability()); }
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void free(Ram_dataspace_capability ds) {
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PWRN("Not 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) {
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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_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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