ARMv7-A: Add skeleton environment and build support for process address environments

arch/arm/Kconfig

@@ -18,6 +18,7 @@ config ARCH_CHIP_A1X
 	select ARCH_HAVE_LOWVECTORS
 	select ARCH_HAVE_SDRAM
 	select BOOT_RUNFROMSDRAM
+	select ADDRENV if EXPERIMENTAL
 	---help---
 		Allwinner A1X family: A10, A10S (A12), A13 (ARM Cortex-A8)
 
@@ -135,6 +136,7 @@ config ARCH_CHIP_SAMA5
 	select ARCH_HAVE_LOWVECTORS
 	select ARCH_HAVE_I2CRESET
 	select ARCH_HAVE_TICKLESS
+        select ADDRENV if EXPERIMENTAL
 	---help---
 		Atmel SAMA5 (ARM Cortex-A5)
 

arch/arm/src/a1x/Make.defs

@@ -82,6 +82,10 @@ CMN_CSRCS += arm_allocpage.c arm_checkmapping.c arm_pginitialize.c
 CMN_CSRCS += arm_va2pte.c
 endif
 
+ifeq ($(CONFIG_ADDRENV),y)
+CMN_CSRCS += arm_addrenv.c
+endif
+
 ifeq ($(CONFIG_ELF),y)
 CMN_CSRCS += arm_elf.c
 endif

arch/arm/src/armv7-a/arm_addrenv.c

@@ -0,0 +1,298 @@
+/****************************************************************************
+ * arch/arm/src/armv7/arm_addrenv.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+/****************************************************************************
+ * Address Environment Interfaces
+ *
+ * Low-level interfaces used in binfmt/ to instantiate tasks with address
+ * environments.  These interfaces all operate on type group_addrenv_t which
+ * is an abstract representation of a task group's address environment and
+ * must be defined in arch/arch.h if CONFIG_ADDRENV is defined.
+ *
+ *   up_addrenv_create  - Create an address environment
+ *   up_addrenv_destroy - Destroy an address environment.
+ *   up_addrenv_vaddr   - Returns the virtual base address of the address
+ *                        environment
+ *   up_addrenv_select  - Instantiate an address environment
+ *   up_addrenv_restore - Restore an address environment
+ *   up_addrenv_assign  - Assign an address environment to a group
+ *
+ * Higher-level interfaces used by the tasking logic.  These interfaces are
+ * used by the functions in sched/ and all operate on the thread which whose
+ * group been assigned an address environment by up_addrenv_assign().
+ *
+ *   up_addrenv_attach  - Clone the address environment assigned to one TCB
+ *                        to another.  This operation is done when a pthread
+ *                        is created that share's the same address
+ *                        environment.
+ *   up_addrenv_detach  - Release the threads reference to an address
+ *                        environment when a task/thread exits.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <errno.h>
+
+#include <nuttx/arch.h>
+#include <arch/arch.h>
+
+#ifdef CONFIG_ADDRENV
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_addrenv_create
+ *
+ * Description:
+ *   This function is called when a new task is created in order to
+ *   instantiate an address environment for the new task group. 
+ *   up_addrenv_create() is essentially the allocator of the physical
+ *   memory for the new task.
+ *
+ * Input Parameters:
+ *   envsize - The size (in bytes) of the address environment needed by the
+ *     task.
+ *   addrenv - The location to return the representation of the task address
+ *     environment.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int up_addrenv_create(size_t envsize, FAR group_addrenv_t *addrenv)
+{
+#warning Missing logic
+  return -ENOSYS;
+}
+
+/****************************************************************************
+ * Name: up_addrenv_destroy
+ *
+ * Description:
+ *   This function is called when a final thread leaves the task group and
+ *   the task group is destroyed.  This function then destroys the defunct
+ *   address environment, releasing the underlying physical memory.
+ *
+ * Input Parameters:
+ *   addrenv - The address environment to be destroyed.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int up_addrenv_destroy(group_addrenv_t addrenv)
+{
+#warning Missing logic
+  return -ENOSYS;
+}
+
+/****************************************************************************
+ * Name: up_addrenv_vaddr
+ *
+ * Description:
+ *   Return the virtual address associated with the newly create address
+ *   environment.  This function is used by the binary loaders in order
+ *   get an address that can be used to initialize the new task.
+ *
+ * Input Parameters:
+ *   addrenv - The representation of the task address environment previously
+ *      returned by up_addrenv_create.
+ *   vaddr - The location to return the virtual address.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int up_addrenv_vaddr(FAR group_addrenv_t addrenv, FAR void **vaddr)
+{
+#warning Missing logic
+  return -ENOSYS;
+}
+
+/****************************************************************************
+ * Name: up_addrenv_select
+ *
+ * Description:
+ *   After an address environment has been established for a task group (via
+ *   up_addrenv_create().  This function may be called to to instantiate
+ *   that address environment in the virtual address space.  this might be
+ *   necessary, for example, to load the code for the task group from a file or
+ *   to access address environment private data.
+ *
+ * Input Parameters:
+ *   addrenv - The representation of the task address environment previously
+ *     returned by up_addrenv_create.
+ *   oldenv
+ *     The address environment that was in place before up_addrenv_select().
+ *     This may be used with up_addrenv_restore() to restore the original
+ *     address environment that was in place before up_addrenv_select() was
+ *     called.  Note that this may be a task agnostic, hardware
+ *     representation that is different from group_addrenv_t.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int up_addrenv_select(group_addrenv_t addrenv, hw_addrenv_t *oldenv)
+{
+#warning Missing logic
+  return -ENOSYS;
+}
+
+/****************************************************************************
+ * Name: up_addrenv_restore
+ *
+ * Description:
+ *   After an address environment has been temporarily instantiated by
+ *   up_addrenv_select(), this function may be called to to restore the
+ *   original address environment.
+ *
+ * Input Parameters:
+ *   oldenv - The hardware representation of the address environment
+ *     previously returned by up_addrenv_select.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int up_addrenv_restore(hw_addrenv_t oldenv)
+{
+#warning Missing logic
+  return -ENOSYS;
+}
+
+/****************************************************************************
+ * Name: up_addrenv_assign
+ *
+ * Description:
+ *   Assign an address environment to a new task group.
+ *
+ * Input Parameters:
+ *   addrenv - The representation of the task address environment previously
+ *     returned by up_addrenv_create().
+ *   group - The new task group to receive the address environment.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int up_addrenv_assign(group_addrenv_t addrenv, FAR struct task_group_s *group)
+{
+#warning Missing logic
+  return -ENOSYS;
+}
+
+/****************************************************************************
+ * Name: up_addrenv_attach
+ *
+ * Description:
+ *   This function is called from the core scheduler logic when a thread
+ *   is created that needs to share the address environment of its task
+ *   group.
+ *
+ *   NOTE: In some platforms, nothing will need to be done in this case.
+ *   Simply being a member of the group that has the address environment
+ *   may be sufficient.
+ *
+ * Input Parameters:
+ *   group - The task group to which the new thread belongs.
+ *   tcb   - The TCB of the thread needing the address environment.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int up_addrenv_attach(FAR struct task_group_s *group, FAR struct tcb_s *tcb)
+{
+#warning Missing logic
+  return -ENOSYS;
+}
+
+/****************************************************************************
+ * Name: up_addrenv_detach
+ *
+ * Description:
+ *   This function is called when a task or thread exits in order to release
+ *   its reference to an address environment.  The address environment,
+ *   however, should persist until up_addrenv_destroy() is called when the
+ *   task group is itself destroyed.  Any resources unique to this thread
+ *   may be destroyed now.
+ *
+ *   NOTE: In some platforms, nothing will need to be done in this case.
+ *   Simply being a member of the group that has the address environment
+ *   may be sufficient.
+ *
+ * Input Parameters:
+ *   group - The group to which the thread belonged.
+ *   tcb - The TCB of the task or thread whose the address environment will
+ *     be released.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int up_addrenv_detach(FAR struct task_group_s *group, FAR struct tcb_s *tcb)
+{
+#warning Missing logic
+  return -ENOSYS;
+}
+
+#endif /* CONFIG_ADDRENV */

arch/arm/src/sama5/Make.defs

@@ -84,6 +84,10 @@ CMN_CSRCS += arm_allocpage.c arm_checkmapping.c arm_pginitialize.c
 CMN_CSRCS += arm_va2pte.c
 endif
 
+ifeq ($(CONFIG_ADDRENV),y)
+CMN_CSRCS += arm_addrenv.c
+endif
+
 ifeq ($(CONFIG_ELF),y)
 CMN_CSRCS += arm_elf.c
 endif