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

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This commit is contained in:
Gregory Nutt 2014-08-23 18:59:24 -06:00
parent 29406c0d20
commit 41196945d6
4 changed files with 308 additions and 0 deletions
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2
arch/arm/Kconfig
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@ -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)

4
arch/arm/src/a1x/Make.defs
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@ -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

298
arch/arm/src/armv7-a/arm_addrenv.c Normal file
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@ -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 */

4
arch/arm/src/sama5/Make.defs
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@ -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