f4b82b6405
The function is not relevant any longer, remove it. Also remove save_addrenv_t, the parameter taken by up_addrenv_restore. Implement addrenv_select() / addrenv_restore() to handle the temporary instantiation of address environments, e.g. when a process is being created.
267 lines
9.4 KiB
C
267 lines
9.4 KiB
C
/****************************************************************************
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* arch/arm/src/armv7-a/arm_addrenv_ustack.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 arch_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_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 address
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* environment.
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* up_addrenv_detach - Release the threads 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_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_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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****************************************************************************/
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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 <string.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/sched.h>
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#include <nuttx/addrenv.h>
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#include <arch/irq.h>
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#include "mmu.h"
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#include "addrenv.h"
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#if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_ARCH_STACK_DYNAMIC)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration */
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#if (CONFIG_ARCH_STACK_VBASE & SECTION_MASK) != 0
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# error CONFIG_ARCH_STACK_VBASE not aligned to section boundary
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#endif
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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_ustackalloc
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*
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* Description:
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* This function is called when a new thread is created in order to
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* instantiate an address environment for the new thread's stack.
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* up_addrenv_ustackalloc() is essentially the allocator of the physical
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* memory for the new task's stack.
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*
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* Input Parameters:
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* tcb - The TCB of the thread that requires the stack address environment.
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* stacksize - The size (in bytes) of the initial stack address
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* environment needed by the task. This region may be read/write only.
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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_ustackalloc(struct tcb_s *tcb, size_t stacksize)
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{
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int ret;
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binfo("tcb=%p stacksize=%lu\n", tcb, (unsigned long)stacksize);
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DEBUGASSERT(tcb);
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/* Initialize the address environment list to all zeroes */
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memset(tcb->xcp.ustack, 0, ARCH_STACK_NSECTS * sizeof(uintptr_t *));
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/* Back the allocation up with physical pages and set up the level 2
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* mapping (which of course does nothing until the L2 page table is hooked
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* into the L1 page table).
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*/
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/* Allocate .text space pages */
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ret = arm_addrenv_create_region(tcb->xcp.ustack, ARCH_STACK_NSECTS,
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CONFIG_ARCH_STACK_VBASE, stacksize,
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MMU_L2_UDATAFLAGS);
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if (ret < 0)
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{
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berr("ERROR: Failed to create stack region: %d\n", ret);
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up_addrenv_ustackfree(tcb);
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return ret;
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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_ustackfree
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*
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* Description:
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* This function is called when any thread exits. This function then
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* destroys the defunct address environment for the thread's stack,
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* releasing the underlying physical memory.
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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 stack address
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* environment.
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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_ustackfree(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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/* Destroy the stack region */
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arm_addrenv_destroy_region(tcb->xcp.ustack, ARCH_STACK_NSECTS,
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CONFIG_ARCH_STACK_VBASE, false);
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memset(tcb->xcp.ustack, 0, ARCH_STACK_NSECTS * sizeof(uintptr_t *));
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return OK;
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}
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/****************************************************************************
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* Name: up_addrenv_vustack
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*
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* Description:
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* Return the virtual address associated with the newly created stack
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* address environment.
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*
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* Input Parameters:
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* tcb - The TCB of the thread with the stack address environment of
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* interest.
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* vstack - The location to return the stack virtual base address.
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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_vustack(const struct tcb_s *tcb, void **vstack)
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{
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binfo("Return=%p\n", (void *)CONFIG_ARCH_STACK_VBASE);
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/* Not much to do in this case */
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DEBUGASSERT(tcb);
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*vstack = (void *)CONFIG_ARCH_STACK_VBASE;
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return OK;
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}
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/****************************************************************************
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* Name: up_addrenv_ustackselect
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*
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* Description:
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* After an address environment has been established for a task's stack
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* (via up_addrenv_ustackalloc(). This function may be called to
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* instantiate that address environment in the virtual address space.
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* This is a necessary step before each context switch to the newly created
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* thread (including the initial thread startup).
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*
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* Input Parameters:
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* tcb - The TCB of the thread with the stack address environment to be
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* instantiated.
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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_ustackselect(const struct tcb_s *tcb)
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{
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uintptr_t vaddr;
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uintptr_t paddr;
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int i;
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DEBUGASSERT(tcb);
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for (vaddr = CONFIG_ARCH_STACK_VBASE, i = 0;
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i < ARCH_TEXT_NSECTS;
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vaddr += ARCH_STACK_NSECTS, i++)
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{
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/* Set (or clear) the new page table entry */
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paddr = (uintptr_t)tcb->xcp.ustack[i];
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if (paddr)
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{
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mmu_l1_setentry(paddr, vaddr, MMU_L1_PGTABFLAGS);
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}
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else
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{
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mmu_l1_clrentry(vaddr);
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}
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}
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return OK;
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}
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#endif /* CONFIG_ARCH_ADDRENV && CONFIG_ARCH_STACK_DYNAMIC */
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