184 lines
7.2 KiB
C
184 lines
7.2 KiB
C
/****************************************************************************
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* arch/arm/src/armv7-a/arm_addrenv_kstack.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Address Environment Interfaces
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*
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* Low-level interfaces used in binfmt/ to instantiate tasks with address
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* environments. These interfaces all operate on type group_addrenv_t which
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* is an abstract representation of a task group's address environment and
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* must be defined in arch/arch.h if CONFIG_ARCH_ADDRENV is defined.
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*
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* up_addrenv_create - Create an address environment
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* up_addrenv_destroy - Destroy an address environment.
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* up_addrenv_vtext - Returns the virtual base address of the .text
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* address environment
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* up_addrenv_vdata - Returns the virtual base address of the .bss/.data
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* address environment
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* up_addrenv_heapsize - Returns the size of the initial heap allocation.
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* up_addrenv_select - Instantiate an address environment
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* up_addrenv_restore - Restore an address environment
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* up_addrenv_clone - Copy an address environment from one location to
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* another.
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*
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* Higher-level interfaces used by the tasking logic. These interfaces are
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* used by the functions in sched/ and all operate on the thread which whose
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* group been assigned an address environment by up_addrenv_clone().
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*
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* up_addrenv_attach - Clone the address environment assigned to one TCB
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* to another. This operation is done when a pthread
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* is created that share's the same group address
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* environment.
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* up_addrenv_detach - Release the thread's reference to an address
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* environment when a task/thread exits.
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*
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* CONFIG_ARCH_STACK_DYNAMIC=y indicates that the user process stack resides
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* in its own address space. This options is also *required* if
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* CONFIG_BUILD_KERNEL and CONFIG_LIBC_EXECFUNCS are selected. Why?
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* Because the caller's stack must be preserved in its own address space
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* when we instantiate the environment of the new process in order to
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* initialize it.
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*
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* NOTE: The naming of the CONFIG_ARCH_STACK_DYNAMIC selection implies that
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* dynamic stack allocation is supported. Certainly this option must be set
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* if dynamic stack allocation is supported by a platform. But the more
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* general meaning of this configuration environment is simply that the
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* stack has its own address space.
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*
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* If CONFIG_ARCH_STACK_DYNAMIC=y is selected then the platform specific
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* code must export these additional interfaces:
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*
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* up_addrenv_ustackalloc - Create a stack address environment
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* up_addrenv_ustackfree - Destroy a stack address environment.
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* up_addrenv_vustack - Returns the virtual base address of the stack
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* up_addrenv_ustackselect - Instantiate a stack address environment
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*
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* If CONFIG_ARCH_KERNEL_STACK is selected, then each user process will have
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* two stacks: (1) a large (and possibly dynamic) user stack and (2) a
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* smaller kernel stack. However, this option is *required* if both
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* CONFIG_BUILD_KERNEL and CONFIG_LIBC_EXECFUNCS are selected. Why? Because
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* when we instantiate and initialize the address environment of the new
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* user process, we will temporarily lose the address environment of the old
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* user process, including its stack contents. The kernel C logic will crash
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* immediately with no valid stack in place.
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*
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* If CONFIG_ARCH_KERNEL_STACK=y is selected then the platform specific
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* code must export these additional interfaces:
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*
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* up_addrenv_kstackalloc - Create a stack in the kernel address
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* environment
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* up_addrenv_kstackfree - Destroy the kernel stack.
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* up_addrenv_vkstack - Return the base address of the kernel stack
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/sched.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/addrenv.h>
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#include <nuttx/arch.h>
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#include "addrenv.h"
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#if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_ARCH_KERNEL_STACK)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_addrenv_kstackalloc
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*
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* Description:
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* This function is called when a new thread is created to allocate
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* the new thread's kernel stack. This function may be called for certain
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* terminating threads which have no kernel stack. It must be tolerant of
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* that case.
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*
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* Input Parameters:
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* tcb - The TCB of the thread that requires the kernel stack.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int up_addrenv_kstackalloc(struct tcb_s *tcb)
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{
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binfo("tcb=%p stacksize=%u\n", tcb, ARCH_KERNEL_STACKSIZE);
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DEBUGASSERT(tcb && tcb->xcp.kstack == 0);
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/* Allocate the kernel stack */
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tcb->xcp.kstack = (uint32_t *)kmm_memalign(8, ARCH_KERNEL_STACKSIZE);
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if (!tcb->xcp.kstack)
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{
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berr("ERROR: Failed to allocate the kernel stack\n");
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return -ENOMEM;
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}
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return OK;
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}
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/****************************************************************************
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* Name: up_addrenv_kstackfree
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*
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* Description:
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* This function is called when any thread exits. This function frees
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* the kernel stack.
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*
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* Input Parameters:
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* tcb - The TCB of the thread that no longer requires the kernel stack.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int up_addrenv_kstackfree(struct tcb_s *tcb)
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{
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binfo("tcb=%p\n", tcb);
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DEBUGASSERT(tcb);
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/* Does the exiting thread have a kernel stack? */
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if (tcb->xcp.kstack)
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{
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/* Yes.. Free the kernel stack */
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kmm_free(tcb->xcp.kstack);
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tcb->xcp.kstack = NULL;
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}
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return OK;
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}
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#endif /* CONFIG_ARCH_ADDRENV && CONFIG_ARCH_KERNEL_STACK */
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