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base: remove local capability from generic base

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* Instead of using local capabilities within core's context area implementation
  for stack allocation/attachment, simply do both operations while stack gets
  attached, thereby getting rid of the local capabilities in generic code
* In base-hw the UTCB of core's main thread gets mapped directly instead of
  constructing a dataspace component out of it and hand over its local
  capability
* Remove local capability implementation from all platforms except Linux

Ref #1443
This commit is contained in:
Stefan Kalkowski 2015-03-17 11:47:25 +01:00 committed by Christian Helmuth
parent a168c9d6ce
commit b949489641
15 changed files with 144 additions and 227 deletions
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28
repos/base-foc/include/base/native_types.h
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@ -78,9 +78,7 @@ namespace Genode {
* Native_capability in Fiasco.OC is just a reference to a Cap_index.
*
* As Cap_index objects cannot be copied around, but Native_capability
* have to, we have to use this indirection. Moreover, it might instead
* of a Cap_index reference some process-local object, and thereby
* implements a local capability.
* have to, we have to use this indirection.
*/
class Native_capability
{
@ -97,18 +95,9 @@ namespace Genode {
private:
Cap_index* _idx;
void* _ptr;
protected:
/**
* Constructs a local capability, used by derived Capability
* class only
*
* \param ptr pointer to process-local object
*/
Native_capability(void* ptr) : _idx(0), _ptr(ptr) { }
inline void _inc()
{
if (_idx)
@ -127,21 +116,18 @@ namespace Genode {
/**
* Default constructor creates an invalid capability
*/
Native_capability() : _idx(0), _ptr(0) { }
Native_capability() : _idx(0) { }
/**
* Construct capability manually
*/
Native_capability(Cap_index* idx)
: _idx(idx), _ptr(0) { _inc(); }
: _idx(idx) { _inc(); }
Native_capability(const Native_capability &o)
: _idx(o._idx), _ptr(o._ptr) { _inc(); }
: _idx(o._idx) { _inc(); }
~Native_capability()
{
_dec();
}
~Native_capability() { _dec(); }
/**
* Return Cap_index object referenced by this object
@ -152,14 +138,13 @@ namespace Genode {
* Overloaded comparision operator
*/
bool operator==(const Native_capability &o) const {
return (_ptr) ? _ptr == o._ptr : _idx == o._idx; }
return _idx == o._idx; }
Native_capability& operator=(const Native_capability &o){
if (this == &o)
return *this;
_dec();
_ptr = o._ptr;
_idx = o._idx;
_inc();
return *this;
@ -172,7 +157,6 @@ namespace Genode {
long local_name() const { return _idx ? _idx->id() : 0; }
Dst dst() const { return _idx ? Dst(_idx->kcap()) : Dst(); }
bool valid() const { return (_idx != 0) && _idx->valid(); }
void *local() const { return _ptr; }
};

16
repos/base-foc/src/base/ipc/ipc.cc
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@ -49,13 +49,6 @@ using namespace Fiasco;
void Ipc_ostream::_marshal_capability(Native_capability const &cap)
{
/* first transfer local capability value */
_write_to_buf(cap.local());
/* if it's a local capability we're done */
if (cap.local())
return;
if (cap.valid()) {
if (!l4_msgtag_label(l4_task_cap_valid(L4_BASE_TASK_CAP, cap.dst()))) {
_write_to_buf(0);
@ -80,15 +73,6 @@ void Ipc_istream::_unmarshal_capability(Native_capability &cap)
{
long value = 0;
/* get local capability pointer from message buffer */
_read_from_buf(value);
/* if it's a local capability, the pointer is marshalled in the id */
if (value) {
cap = Capability<Native_capability>::local_cap((Native_capability*)value);
return;
}
/* extract capability id from message buffer */
_read_from_buf(value);

1
repos/base-foc/src/core/cap_session_component.cc
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@ -34,6 +34,7 @@ namespace Fiasco {
using namespace Genode;
/***************************
** Cap_index_allocator **
***************************/

1
repos/base-hw/src/core/include/kernel/kernel.h
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@ -22,6 +22,7 @@ namespace Kernel {
Pd * core_pd();
Mode_transition_control * mtc();
Pic * pic();
Native_utcb * core_main_thread_utcb_phys_addr();
}
#endif /* _KERNEL__KERNEL_H_ */

15
repos/base-hw/src/core/kernel/kernel.cc
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@ -46,6 +46,7 @@ extern void * _start_secondary_cpus;
extern int _prog_img_beg;
extern int _prog_img_end;
namespace Kernel
{
/* import Genode types */
@ -190,6 +191,10 @@ namespace Kernel
Pic * Kernel::pic() { return unmanaged_singleton<Pic>(); }
Native_utcb* Kernel::core_main_thread_utcb_phys_addr() {
return unmanaged_singleton<Native_utcb,Genode::get_page_size()>(); }
/**
* Enable kernel-entry assembly to get an exclusive stack for every CPU
*/
@ -244,18 +249,14 @@ void init_kernel_mp_primary()
*(Core_thread_id *)s = 0;
/* initialize UTCB and map it */
static Native_utcb utcb __attribute__((aligned(get_page_size())));
static Dataspace_component main_utcb_ds(sizeof(Native_utcb),
(addr_t)UTCB_MAIN_THREAD,
(addr_t)&utcb, CACHED, true, 0);
Genode::map_local((addr_t)&utcb, (addr_t)UTCB_MAIN_THREAD,
Native_utcb * utcb = Kernel::core_main_thread_utcb_phys_addr();
Genode::map_local((addr_t)utcb, (addr_t)UTCB_MAIN_THREAD,
sizeof(Native_utcb) / get_page_size());
static Kernel::Thread t(Cpu_priority::max, 0, "core");
/* start thread with stack pointer at the top of stack */
utcb.start_info()->init(t.id(),
Dataspace_capability::local_cap(&main_utcb_ds));
utcb->start_info()->init(t.id(), Dataspace_capability());
t.ip = (addr_t)&_core_start;
t.sp = (addr_t)s + STACK_SIZE;
t.init(cpu_pool()->primary_cpu(), core_pd(),

16
repos/base-hw/src/core/thread_start.cc
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@ -18,6 +18,8 @@
#include <base/env.h>
/* core includes */
#include <map_local.h>
#include <kernel/kernel.h>
#include <platform.h>
#include <platform_thread.h>
@ -57,17 +59,11 @@ void Thread_base::_init_platform_thread(size_t, Type type)
return;
}
size_t const utcb_size = sizeof(Native_utcb);
addr_t const context_area = Native_config::context_area_virtual_base();
addr_t const utcb_new = (addr_t)&_context->utcb - context_area;
Rm_session * const rm = env_context_area_rm_session();
/* remap initial main-thread UTCB according to context-area spec */
try { rm->attach_at(_main_thread_utcb_ds, utcb_new, utcb_size); }
catch(...) {
PERR("failed to re-map UTCB");
while (1) ;
}
Genode::map_local((addr_t)Kernel::core_main_thread_utcb_phys_addr(),
(addr_t)&_context->utcb,
max(sizeof(Native_utcb) / get_page_size(), (size_t)1));
/* adjust initial object state in case of a main thread */
tid().thread_id = _main_thread_id;
}

60
repos/base-linux/include/base/local_capability.h Normal file
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@ -0,0 +1,60 @@
/*
* \brief Local capability
* \author Norman Feske
* \author Stefan Kalkowski
* \date 2011-05-22
*
* A typed capability is a capability tied to one specifiec RPC interface
*/
/*
* Copyright (C) 2011-2015 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.
*/
#ifndef _INCLUDE__BASE_LINUX__CAPABILITY_H_
#define _INCLUDE__BASE_LINUX__CAPABILITY_H_
#include <base/capability.h>
namespace Genode {
template <typename> class Local_capability;
}
/**
* Local capability referring to a specific RPC interface
*
* \param RPC_INTERFACE class containing the RPC interface declaration
*/
template <typename RPC_INTERFACE>
class Genode::Local_capability
{
public:
/**
* Factory method to construct a local-capability.
*
* Local-capabilities can be used protection-domain internally
* only. They simply incorporate a pointer to some process-local
* object.
*
* \param ptr pointer to the corresponding local object.
* \return a capability that represents the local object.
*/
static Capability<RPC_INTERFACE> local_cap(RPC_INTERFACE* ptr) {
Untyped_capability cap(Cap_dst_policy::Dst(), (long)ptr);
return reinterpret_cap_cast<RPC_INTERFACE>(cap); }
/**
* Dereference a local-capability.
*
* \param c the local-capability.
* \return pointer to the corresponding local object.
*/
static RPC_INTERFACE* deref(Capability<RPC_INTERFACE> c) {
return reinterpret_cast<RPC_INTERFACE*>(c.local_name()); }
};
#endif /* _INCLUDE__BASE_LINUX__CAPABILITY_H_ */

4
repos/base-linux/include/rm_session/client.h
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@ -15,6 +15,7 @@
#define _INCLUDE__RM_SESSION__CLIENT_H_
/* Genode includes */
#include <base/local_capability.h>
#include <rm_session/capability.h>
namespace Genode {
@ -28,7 +29,8 @@ namespace Genode {
*
* \throw Local_interface::Non_local_capability
*/
Rm_session *_local() const { return Rm_session_capability::deref(*this); }
Rm_session *_local() const {
return Local_capability<Rm_session>::deref(*this); }
explicit Rm_session_client(Rm_session_capability session)
: Rm_session_capability(session) { }

6
repos/base-linux/src/base/env/platform_env.cc vendored
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@ -33,7 +33,7 @@ Platform_env_base::Rm_session_mmap::_dataspace_size(Dataspace_capability ds)
if (ds.valid())
return Dataspace_client(ds).size();
return Dataspace_capability::deref(ds)->size();
return Local_capability<Dataspace>::deref(ds)->size();
}
@ -78,7 +78,7 @@ Platform_env::Local_parent::session(Service_name const &service_name,
Rm_session_mmap *rm = new (env()->heap())
Rm_session_mmap(true, size);
return Session_capability::local_cap(rm);
return Local_capability<Session>::local_cap(rm);
}
return Expanding_parent_client::session(service_name, args, affinity);
@ -100,7 +100,7 @@ void Platform_env::Local_parent::close(Session_capability session)
*/
Capability<Rm_session_mmap> rm = static_cap_cast<Rm_session_mmap>(session);
destroy(env()->heap(), Capability<Rm_session_mmap>::deref(rm));
destroy(env()->heap(), Local_capability<Rm_session_mmap>::deref(rm));
}

7
repos/base-linux/src/base/env/platform_env.h vendored
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@ -23,6 +23,7 @@
/* Genode includes */
#include <util/misc_math.h>
#include <base/local_capability.h>
#include <base/heap.h>
#include <linux_cpu_session/client.h>
@ -307,10 +308,8 @@ namespace Genode {
* as argument to 'Rm_session_mmap::attach'. It is not a
* real capability.
*/
Dataspace_capability dataspace()
{
return Dataspace_capability::local_cap(this);
}
Dataspace_capability dataspace() {
return Local_capability<Dataspace>::local_cap(this); }
};
private:

7
repos/base-linux/src/base/env/rm_session_mmap.cc vendored
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@ -33,6 +33,7 @@
*/
/* Genode includes */
#include <base/local_capability.h>
#include <base/thread.h>
#include <linux_dataspace/client.h>
#include <linux_syscalls.h>
@ -49,7 +50,7 @@ static bool is_sub_rm_session(Dataspace_capability ds)
if (ds.valid())
return false;
return Dataspace_capability::deref(ds) != 0;
return Local_capability<Dataspace>::deref(ds) != 0;
}
@ -231,7 +232,7 @@ Platform_env::Rm_session_mmap::attach(Dataspace_capability ds,
if (is_sub_rm_session(ds)) {
Dataspace *ds_if = Dataspace_capability::deref(ds);
Dataspace *ds_if = Local_capability<Dataspace>::deref(ds);
Rm_session_mmap *rm = dynamic_cast<Rm_session_mmap *>(ds_if);
@ -355,7 +356,7 @@ void Platform_env::Rm_session_mmap::detach(Rm_session::Local_addr local_addr)
*/
if (is_sub_rm_session(region.dataspace())) {
Dataspace *ds_if = Dataspace_capability::deref(region.dataspace());
Dataspace *ds_if = Local_capability<Dataspace>::deref(region.dataspace());
Rm_session_mmap *rm = dynamic_cast<Rm_session_mmap *>(ds_if);
if (rm)
rm->_base = 0;

2
repos/base-linux/src/core/platform.cc
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@ -181,7 +181,7 @@ Genode::size_t
Platform_env_base::Rm_session_mmap::_dataspace_size(Capability<Dataspace> ds_cap)
{
if (!ds_cap.valid())
return Dataspace_capability::deref(ds_cap)->size();
return Local_capability<Dataspace>::deref(ds_cap)->size();
/* use RPC if called from a different thread */
if (!core_env()->entrypoint()->is_myself()) {

26
repos/base-nova/include/base/native_types.h
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@ -41,7 +41,7 @@ namespace Genode {
inline bool operator == (Native_thread_id t1, Native_thread_id t2)
{
return (t1.ec_sel == t2.ec_sel) &&
(t1.exc_pt_sel == t2.exc_pt_sel);
(t1.exc_pt_sel == t2.exc_pt_sel);
}
inline bool operator != (Native_thread_id t1, Native_thread_id t2)
{
@ -99,18 +99,12 @@ namespace Genode {
} _cap;
bool _trans_map;
void * _ptr;
addr_t _rcv_window;
enum { INVALID_INDEX = ~0UL };
protected:
explicit
Native_capability(void* ptr)
: _cap(), _trans_map(true), _ptr(ptr),
_rcv_window(INVALID_INDEX) {}
inline void _inc(bool inc_if_one = false) const
{
Cap_index idx(cap_map()->find(local_name()));
@ -130,7 +124,7 @@ namespace Genode {
*/
Native_capability()
: _cap(), _trans_map(true), _ptr(0), _rcv_window(INVALID_INDEX) {}
: _cap(), _trans_map(true), _rcv_window(INVALID_INDEX) {}
explicit
Native_capability(addr_t sel, unsigned rights = 0x1f)
@ -143,12 +137,11 @@ namespace Genode {
}
_trans_map = true;
_ptr = 0;
_rcv_window = INVALID_INDEX;
}
Native_capability(const Native_capability &o)
: _cap(o._cap), _trans_map(o._trans_map), _ptr(o._ptr),
: _cap(o._cap), _trans_map(o._trans_map),
_rcv_window(o._rcv_window) { if (valid()) _inc(); }
~Native_capability() { if (valid()) _dec(); }
@ -157,7 +150,7 @@ namespace Genode {
* Overloaded comparison operator
*/
bool operator==(const Native_capability &o) const {
return (_ptr) ? _ptr == o._ptr : local_name() == o.local_name(); }
return local_name() == o.local_name(); }
Native_capability operator+ () const
{
@ -178,7 +171,6 @@ namespace Genode {
_cap = o._cap;
_trans_map = o._trans_map;
_ptr = o._ptr;
_rcv_window = o._rcv_window;
if (valid()) _inc();
@ -187,19 +179,13 @@ namespace Genode {
}
/**
* Check whether the selector of the Native_cap and
* Check whether the selector of the Native_cap and
* the capability type is valid.
*/
bool valid() const { return !_cap.dst.is_null(); }
Dst dst() const { return _cap.dst; }
/**
* Return pointer to the server object identified by
* this cap
*/
void * local() const { return _ptr; }
/**
* Return the local_name. On NOVA it is the same as the
* destination value.
@ -247,7 +233,7 @@ namespace Genode {
* Return true if the cap should be tried first to
* be translated and if this fails it should be mapped.
*/
bool trans_map() const { return _trans_map; }
bool trans_map() const { return _trans_map; }
};
typedef int Native_connection_state;

30
repos/base/include/base/capability.h
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@ -135,14 +135,6 @@ class Genode::Capability : public Untyped_capability
return cap;
}
/**
* Private constructor, should be used by the local-capability
* factory method only.
*
* \param ptr pointer to the local object this capability represents.
*/
Capability(void *ptr) : Untyped_capability(ptr) {}
/**
* Wrapper for the return type instantiated by 'call' overloads
*
@ -186,28 +178,6 @@ class Genode::Capability : public Untyped_capability
*/
Capability() { }
/**
* Factory method to construct a local-capability.
*
* Local-capabilities can be used protection-domain internally
* only. They simply incorporate a pointer to some process-local
* object.
*
* \param ptr pointer to the corresponding local object.
* \return a capability that represents the local object.
*/
static Capability<RPC_INTERFACE> local_cap(RPC_INTERFACE* ptr) {
return Capability<RPC_INTERFACE>((void*)ptr); }
/**
* Dereference a local-capability.
*
* \param c the local-capability.
* \return pointer to the corresponding local object.
*/
static RPC_INTERFACE* deref(Capability<RPC_INTERFACE> c) {
return reinterpret_cast<RPC_INTERFACE*>(c.local()); }
template <typename IF>
typename Trait::Call_return<typename IF::Ret_type>::Type
call() const

152
repos/base/src/core/context_area.cc
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@ -1,11 +1,12 @@
/*
* \brief Support code for the thread API
* \author Norman Feske
* \author Stefan Kalkowski
* \date 2010-01-13
*/
/*
* Copyright (C) 2010-2013 Genode Labs GmbH
* 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.
@ -25,37 +26,54 @@
using namespace Genode;
/**
* Pointer to dataspace used to hold core contexts
*/
enum { MAX_CORE_CONTEXTS = 256 };
static Dataspace_component *context_ds[MAX_CORE_CONTEXTS];
/**
* Region-manager session for allocating thread contexts
*
* This class corresponds to the managed dataspace that is normally
* used for organizing thread contexts with the thread context area.
* It "emulates" the sub address space by adjusting the local address
* argument to 'attach' with the offset of the thread context 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
* refering 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 Context_area_rm_session : public Rm_session
{
enum { verbose = false };
private:
using Ds_slab = Synchronized_allocator<Tslab<Dataspace_component,
get_page_size()> >;
Ds_slab _ds_slab { platform()->core_mem_alloc() };
enum { verbose = false };
public:
/**
* Attach backing store to thread-context area
* Allocate and attach on-the-fly backing store to thread-context area
*/
Local_addr attach(Dataspace_capability ds_cap,
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)
{
Dataspace_component *ds =
dynamic_cast<Dataspace_component*>(Dataspace_capability::deref(ds_cap));
/* 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 context");
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 context does not exist");
return (addr_t)0;
@ -70,7 +88,8 @@ class Context_area_rm_session : public Rm_session
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);
PERR("could not map phys %lx at local %lx",
ds->phys_addr(), core_local_addr);
return (addr_t)0;
}
@ -79,35 +98,7 @@ class Context_area_rm_session : public Rm_session
return local_addr;
}
void detach(Local_addr local_addr)
{
addr_t core_local_addr = Native_config::context_area_virtual_base() +
(addr_t)local_addr;
Dataspace_component *ds = 0;
/* find the dataspace component for the given address */
for (unsigned i = 0; i < MAX_CORE_CONTEXTS; i++) {
if (context_ds[i] &&
(core_local_addr >= context_ds[i]->core_local_addr()) &&
(core_local_addr < (context_ds[i]->core_local_addr() +
context_ds[i]->size()))) {
ds = context_ds[i];
break;
}
}
if (!ds) {
PERR("dataspace for core context does not exist");
return;
}
if (verbose)
PDBG("core_local_addr = %lx, phys_addr = %lx, size = 0x%zx",
ds->core_local_addr(), ds->phys_addr(), ds->size());
Genode::unmap_local(ds->core_local_addr(), ds->size() >> get_page_size_log2());
}
void detach(Local_addr local_addr) { PWRN("Not implemented!"); }
Pager_capability add_client(Thread_capability) {
return Pager_capability(); }
@ -124,76 +115,18 @@ class Context_area_rm_session : public Rm_session
class Context_area_ram_session : public Ram_session
{
private:
enum { verbose = false };
using Ds_slab = Synchronized_allocator<Tslab<Dataspace_component,
get_page_size()> >;
Ds_slab _ds_slab { platform()->core_mem_alloc() };
public:
Ram_dataspace_capability alloc(size_t size, Cache_attribute cached)
{
/* find free context */
unsigned i;
for (i = 0; i < MAX_CORE_CONTEXTS; i++)
if (!context_ds[i])
break;
Ram_dataspace_capability alloc(size_t size, Cache_attribute cached) {
return reinterpret_cap_cast<Ram_dataspace>(Native_capability()); }
if (i == MAX_CORE_CONTEXTS) {
PERR("maximum number of core contexts (%d) reached", MAX_CORE_CONTEXTS);
return Ram_dataspace_capability();
}
/* allocate physical memory */
size = round_page(size);
void *phys_base;
if (platform_specific()->ram_alloc()->alloc_aligned(size, &phys_base,
get_page_size_log2()).is_error()) {
PERR("could not allocate backing store for new context");
return Ram_dataspace_capability();
}
if (verbose)
PDBG("phys_base = %p, size = 0x%zx", phys_base, size);
context_ds[i] = new (&_ds_slab)
Dataspace_component(size, 0, (addr_t)phys_base, CACHED, true, 0);
Dataspace_capability cap = Dataspace_capability::local_cap(context_ds[i]);
return static_cap_cast<Ram_dataspace>(cap);
}
void free(Ram_dataspace_capability ds)
{
Dataspace_component *dataspace_component =
dynamic_cast<Dataspace_component*>(Dataspace_capability::deref(ds));
if (!dataspace_component)
return;
for (unsigned i = 0; i < MAX_CORE_CONTEXTS; i++)
if (context_ds[i] == dataspace_component) {
context_ds[i] = 0;
break;
}
void *phys_addr = (void*)dataspace_component->phys_addr();
size_t size = dataspace_component->size();
if (verbose)
PDBG("phys_addr = %p, size = 0x%zx", phys_addr, size);
destroy(&_ds_slab, dataspace_component);
platform_specific()->ram_alloc()->free(phys_addr, size);
}
void free(Ram_dataspace_capability ds) {
PWRN("Not implemented!"); }
int ref_account(Ram_session_capability ram_session) { return 0; }
int transfer_quota(Ram_session_capability ram_session, size_t amount) { return 0; }
int transfer_quota(Ram_session_capability ram_session, size_t amount) {
return 0; }
size_t quota() { return 0; }
@ -218,4 +151,3 @@ namespace Genode {
return &inst;
}
}