169 lines
4.4 KiB
C++
169 lines
4.4 KiB
C++
/*
|
|
* \brief Support code for the thread API
|
|
* \author Norman Feske
|
|
* \author Stefan Kalkowski
|
|
* \date 2010-01-13
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2010-2015 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
/* Genode includes */
|
|
#include <rm_session/rm_session.h>
|
|
#include <ram_session/ram_session.h>
|
|
#include <base/printf.h>
|
|
#include <base/synced_allocator.h>
|
|
#include <base/thread.h>
|
|
|
|
/* base-internal includes */
|
|
#include <base/internal/stack_area.h>
|
|
|
|
/* local includes */
|
|
#include <platform.h>
|
|
#include <map_local.h>
|
|
#include <dataspace_component.h>
|
|
|
|
using namespace Genode;
|
|
|
|
|
|
/**
|
|
* Region-manager session for allocating stacks
|
|
*
|
|
* This class corresponds to the managed dataspace that is normally
|
|
* used for organizing stacks within the stack area.
|
|
* In contrast to the ordinary implementation, core's version does
|
|
* not split between allocation of memory and virtual memory management.
|
|
* Due to the missing availability of "real" dataspaces and capabilities
|
|
* referring to it without having an entrypoint in place, the allocation
|
|
* of a dataspace has no effect, but the attachment of the thereby "empty"
|
|
* dataspace is doing both: allocation and attachment.
|
|
*/
|
|
class Stack_area_rm_session : public Rm_session
|
|
{
|
|
private:
|
|
|
|
using Ds_slab = Synced_allocator<Tslab<Dataspace_component,
|
|
get_page_size()> >;
|
|
|
|
Ds_slab _ds_slab { platform()->core_mem_alloc() };
|
|
|
|
enum { verbose = false };
|
|
|
|
public:
|
|
|
|
/**
|
|
* Allocate and attach on-the-fly backing store to stack area
|
|
*/
|
|
Local_addr attach(Dataspace_capability ds_cap, /* ignored capability */
|
|
size_t size, off_t offset,
|
|
bool use_local_addr, Local_addr local_addr,
|
|
bool executable)
|
|
{
|
|
/* allocate physical memory */
|
|
size = round_page(size);
|
|
void *phys_base;
|
|
Range_allocator *ra = platform_specific()->ram_alloc();
|
|
if (ra->alloc_aligned(size, &phys_base,
|
|
get_page_size_log2()).is_error()) {
|
|
PERR("could not allocate backing store for new stack");
|
|
return (addr_t)0;
|
|
}
|
|
|
|
if (verbose)
|
|
PDBG("phys_base = %p, size = 0x%zx", phys_base, size);
|
|
|
|
Dataspace_component *ds = new (&_ds_slab)
|
|
Dataspace_component(size, 0, (addr_t)phys_base, CACHED, true, 0);
|
|
if (!ds) {
|
|
PERR("dataspace for core stack does not exist");
|
|
return (addr_t)0;
|
|
}
|
|
|
|
addr_t core_local_addr = stack_area_virtual_base() + (addr_t)local_addr;
|
|
|
|
if (verbose)
|
|
PDBG("core_local_addr = %lx, phys_addr = %lx, size = 0x%zx",
|
|
core_local_addr, ds->phys_addr(), ds->size());
|
|
|
|
if (!map_local(ds->phys_addr(), core_local_addr,
|
|
ds->size() >> get_page_size_log2())) {
|
|
PERR("could not map phys %lx at local %lx",
|
|
ds->phys_addr(), core_local_addr);
|
|
return (addr_t)0;
|
|
}
|
|
|
|
ds->assign_core_local_addr((void*)core_local_addr);
|
|
|
|
return local_addr;
|
|
}
|
|
|
|
void detach(Local_addr local_addr)
|
|
{
|
|
using Genode::addr_t;
|
|
|
|
if ((addr_t)local_addr >= stack_area_virtual_size())
|
|
return;
|
|
|
|
addr_t const detach = stack_area_virtual_base() + (addr_t)local_addr;
|
|
addr_t const stack = stack_virtual_size();
|
|
addr_t const pages = ((detach & ~(stack - 1)) + stack - detach)
|
|
>> get_page_size_log2();
|
|
|
|
unmap_local(detach, pages);
|
|
}
|
|
|
|
Pager_capability add_client(Thread_capability) {
|
|
return Pager_capability(); }
|
|
|
|
void remove_client(Pager_capability) { }
|
|
|
|
void fault_handler(Signal_context_capability) { }
|
|
|
|
State state() { return State(); }
|
|
|
|
Dataspace_capability dataspace() { return Dataspace_capability(); }
|
|
};
|
|
|
|
|
|
class Stack_area_ram_session : public Ram_session
|
|
{
|
|
public:
|
|
|
|
Ram_dataspace_capability alloc(size_t size, Cache_attribute cached) {
|
|
return reinterpret_cap_cast<Ram_dataspace>(Native_capability()); }
|
|
|
|
void free(Ram_dataspace_capability ds) { }
|
|
|
|
int ref_account(Ram_session_capability ram_session) { return 0; }
|
|
|
|
int transfer_quota(Ram_session_capability ram_session, size_t amount) {
|
|
return 0; }
|
|
|
|
size_t quota() { return 0; }
|
|
|
|
size_t used() { return 0; }
|
|
};
|
|
|
|
|
|
/**
|
|
* Return single instance of the context-area RM and RAM session
|
|
*/
|
|
namespace Genode {
|
|
|
|
Rm_session *env_stack_area_rm_session()
|
|
{
|
|
static Stack_area_rm_session inst;
|
|
return &inst;
|
|
}
|
|
|
|
Ram_session *env_stack_area_ram_session()
|
|
{
|
|
static Stack_area_ram_session inst;
|
|
return &inst;
|
|
}
|
|
}
|