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incubator-nuttx/include/nuttx/addrenv.h

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/****************************************************************************
* include/nuttx/addrenv.h
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
#ifndef __INCLUDE_NUTTX_ADDRENV_H
#define __INCLUDE_NUTTX_ADDRENV_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifdef CONFIG_BUILD_KERNEL
# include <signal.h>
#endif
#include <stdbool.h>
#include <stdint.h>
#include <nuttx/wqueue.h>
#include <arch/arch.h>
#ifdef CONFIG_ARCH_ADDRENV
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* Pre-requisites */
#ifndef CONFIG_MM_PGALLOC
# error CONFIG_MM_PGALLOC not defined
#endif
#ifndef CONFIG_MM_PGSIZE
# error CONFIG_MM_PGSIZE not defined
#endif
/* .text region */
#ifndef CONFIG_ARCH_TEXT_VBASE
# error CONFIG_ARCH_TEXT_VBASE not defined
# define CONFIG_ARCH_TEXT_VBASE 0
#endif
#if (CONFIG_ARCH_TEXT_VBASE & CONFIG_MM_MASK) != 0
# error CONFIG_ARCH_TEXT_VBASE not aligned to page boundary
#endif
#ifndef CONFIG_ARCH_TEXT_NPAGES
# warning CONFIG_ARCH_TEXT_NPAGES not defined
# define CONFIG_ARCH_TEXT_NPAGES 1
#endif
#define ARCH_TEXT_SIZE (CONFIG_ARCH_TEXT_NPAGES * CONFIG_MM_PGSIZE)
#define ARCH_TEXT_VEND (CONFIG_ARCH_TEXT_VBASE + ARCH_TEXT_SIZE)
/* .bss/.data region */
#ifndef CONFIG_ARCH_DATA_VBASE
# error CONFIG_ARCH_DATA_VBASE not defined
# define CONFIG_ARCH_DATA_VBASE ARCH_TEXT_VEND
#endif
#if (CONFIG_ARCH_DATA_VBASE & CONFIG_MM_MASK) != 0
# error CONFIG_ARCH_DATA_VBASE not aligned to page boundary
#endif
#ifndef CONFIG_ARCH_DATA_NPAGES
# warning CONFIG_ARCH_DATA_NPAGES not defined
# define CONFIG_ARCH_DATA_NPAGES 1
#endif
#define ARCH_DATA_SIZE (CONFIG_ARCH_DATA_NPAGES * CONFIG_MM_PGSIZE)
#define ARCH_DATA_VEND (CONFIG_ARCH_DATA_VBASE + ARCH_DATA_SIZE)
/* Reserved .bss/.data region. In the kernel build (CONFIG_BUILD_KERNEL),
* the region at the beginning of the .bss/.data region is reserved for use
* by the OS. This reserved region contains support for:
*
* 1. The task group's heap memory management data structures and
* 2. Support for delivery of signals.
*
* We don't use sizeof(struct addrenv_reserve_s) but, instead, a nice
* even number that we must be assure is greater than or equal to
* sizeof(struct addrenv_reserve_s)
*/
#ifdef CONFIG_BUILD_KERNEL
# define ARCH_DATA_RESERVE_SIZE 512
#else
# define ARCH_DATA_RESERVE_SIZE 0
#endif
/* Heap region */
#ifndef CONFIG_ARCH_HEAP_VBASE
# error CONFIG_ARCH_HEAP_VBASE not defined
# define CONFIG_ARCH_HEAP_VBASE ARCH_DATA_VEND
#endif
#if (CONFIG_ARCH_HEAP_VBASE & CONFIG_MM_MASK) != 0
# error CONFIG_ARCH_HEAP_VBASE not aligned to page boundary
#endif
#ifndef CONFIG_ARCH_HEAP_NPAGES
# warning CONFIG_ARCH_HEAP_NPAGES not defined
# define CONFIG_ARCH_HEAP_NPAGES 1
#endif
#define ARCH_HEAP_SIZE (CONFIG_ARCH_HEAP_NPAGES * CONFIG_MM_PGSIZE)
#define ARCH_HEAP_VEND (CONFIG_ARCH_HEAP_VBASE + ARCH_HEAP_SIZE)
#ifdef CONFIG_ARCH_STACK_DYNAMIC
/* User stack region */
# ifndef CONFIG_ARCH_STACK_VBASE
# error CONFIG_ARCH_STACK_VBASE not defined
# define CONFIG_ARCH_STACK_VBASE ARCH_HEAP_VEND
# endif
# if (CONFIG_ARCH_STACK_VBASE & CONFIG_MM_MASK) != 0
# error CONFIG_ARCH_STACK_VBASE not aligned to page boundary
# endif
# ifndef CONFIG_ARCH_STACK_NPAGES
# warning CONFIG_ARCH_STACK_NPAGES not defined
# define CONFIG_ARCH_STACK_NPAGES 1
# endif
# define ARCH_STACK_SIZE (CONFIG_ARCH_STACK_NPAGES * CONFIG_MM_PGSIZE)
# define ARCH_STACK_VEND (CONFIG_ARCH_STACK_VBASE + ARCH_STACK_SIZE)
#ifdef CONFIG_ARCH_KERNEL_STACK
/* Kernel stack */
# ifndef CONFIG_ARCH_KERNEL_STACKSIZE
# define CONFIG_ARCH_KERNEL_STACKSIZE 1568
# endif
#endif
/* A single page scratch region used for temporary mappings */
# define __ARCH_SHM_VBASE ARCH_STACK_VEND
#else
/* A single page scratch region used for temporary mappings */
# define __ARCH_SHM_VBASE ARCH_HEAP_VEND
#endif
/* Shared memory regions */
#ifdef CONFIG_ARCH_VMA_MAPPING
# ifndef CONFIG_ARCH_SHM_VBASE
# error CONFIG_ARCH_SHM_VBASE not defined
# define CONFIG_ARCH_SHM_VBASE __ARCH_SHM_VBASE
# endif
# if (CONFIG_ARCH_SHM_VBASE & CONFIG_MM_MASK) != 0
# error CONFIG_ARCH_SHM_VBASE not aligned to page boundary
# endif
# ifndef CONFIG_ARCH_SHM_MAXREGIONS
# warning CONFIG_ARCH_SHM_MAXREGIONS not defined
# define CONFIG_ARCH_SHM_MAXREGIONS 1
# endif
# ifndef CONFIG_ARCH_SHM_NPAGES
# warning CONFIG_ARCH_SHM_NPAGES not defined
# define CONFIG_ARCH_SHM_NPAGES 1
# endif
# define ARCH_SHM_SIZE (CONFIG_ARCH_SHM_NPAGES * CONFIG_MM_PGSIZE)
# define ARCH_SHM_VEND (CONFIG_ARCH_SHM_VBASE + ARCH_SHM_SIZE - 1)
# define ARCH_SCRATCH_VBASE ARCH_SHM_VEND
#else
# define ARCH_SCRATCH_VBASE __ARCH_SHM_VBASE
#endif
#ifdef CONFIG_MM_KMAP
# ifndef CONFIG_ARCH_KMAP_VBASE
# error CONFIG_ARCH_KMAP_VBASE not defined
# endif
# if (CONFIG_ARCH_KMAP_VBASE & CONFIG_MM_MASK) != 0
# error CONFIG_ARCH_KMAP_VBASE not aligned to page boundary
# endif
# ifndef CONFIG_ARCH_KMAP_NPAGES
# error CONFIG_ARCH_KMAP_NPAGES not defined
# endif
# define ARCH_KMAP_SIZE (CONFIG_ARCH_KMAP_NPAGES * CONFIG_MM_PGSIZE)
# define ARCH_KMAP_VEND (CONFIG_ARCH_KMAP_VBASE + ARCH_KMAP_SIZE - 1)
#endif
/* There is no need to use the scratch memory region if the page pool memory
* is statically mapped.
*/
#ifdef CONFIG_ARCH_PGPOOL_MAPPING
# ifndef CONFIG_ARCH_PGPOOL_PBASE
# error CONFIG_ARCH_PGPOOL_PBASE not defined
# endif
# ifndef CONFIG_ARCH_PGPOOL_VBASE
# error CONFIG_ARCH_PGPOOL_VBASE not defined
# endif
# ifndef CONFIG_ARCH_PGPOOL_SIZE
# error CONFIG_ARCH_PGPOOL_SIZE not defined
# endif
# define CONFIG_ARCH_PGPOOL_PEND \
(CONFIG_ARCH_PGPOOL_PBASE + CONFIG_ARCH_PGPOOL_SIZE)
# define CONFIG_ARCH_PGPOOL_VEND \
(CONFIG_ARCH_PGPOOL_VBASE + CONFIG_ARCH_PGPOOL_SIZE)
#endif
/****************************************************************************
* Public Type Definitions
****************************************************************************/
struct tcb_s; /* Forward reference to TCB */
/****************************************************************************
* Public Types
****************************************************************************/
#ifndef __ASSEMBLY__
struct addrenv_s
{
struct arch_addrenv_s addrenv; /* The address environment page directory */
struct work_s work; /* Worker to free address environment */
int refs; /* Users of address environment */
};
typedef struct addrenv_s addrenv_t;
/* Reserved .bss/.data region. In the kernel build (CONFIG_BUILD_KERNEL),
* the region at the beginning of the .bss/.data region is reserved for use
* by the OS. This reserved region contains support for:
*
* 1. The task group's heap memory management data structures and
* 2. Support for delivery of signals.
*/
#ifdef CONFIG_BUILD_KERNEL
/* This is the type of the signal handler trampoline routine. This
* trampoline is called directly from kernel logic. It simply forwards the
* signal information to the real signal handler. When the signal handler
* returns, this function issues a system call in order to return in kernel
* mode.
*/
typedef CODE void (*addrenv_sigtramp_t)(_sa_sigaction_t sighand, int signo,
FAR siginfo_t *info,
FAR void *ucontext);
struct mm_heaps_s; /* Forward reference */
/* This structure describes the format of the .bss/.data reserved area */
struct addrenv_reserve_s
{
addrenv_sigtramp_t ar_sigtramp; /* Signal trampoline */
struct mm_heap_s *ar_usrheap; /* User space heap structure */
};
/* Each instance of this structure resides at the beginning of the user-
* space .bss/.data region. This macro is provided to simplify access:
*/
#define ARCH_DATA_RESERVE \
((FAR struct addrenv_reserve_s *)CONFIG_ARCH_DATA_VBASE)
#endif
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: addrenv_allocate
*
* Description:
* Allocate an address environment for a new process.
*
* Input Parameters:
* None
*
* Returned Value:
* Pointer to the new address environment, or NULL if out of memory.
*
****************************************************************************/
FAR struct addrenv_s *addrenv_allocate(void);
/****************************************************************************
* Name: addrenv_switch
*
* Description:
* Switch to an address environment.
*
* Input Parameters:
* tcb - The tcb of the task to switch to, or NULL to use the task at the
* head of the ready-to-run list.
*
* Returned Value:
* This is a NuttX internal function so it follows the convention that
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
int addrenv_switch(FAR struct tcb_s *tcb);
/****************************************************************************
* Name: addrenv_attach
*
* Description:
* Attach address environment to a newly process. Called by exec() right
* before injecting the new process into the system.
*
* Input Parameters:
* tcb - The tcb of the newly loaded task.
* addrenv - The address environment that is attached.
*
* Returned Value:
* This is a NuttX internal function so it follows the convention that
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
int addrenv_attach(FAR struct tcb_s *tcb, FAR struct addrenv_s *addrenv);
/****************************************************************************
* Name: addrenv_join
*
* Description:
* Join the parent process's address environment.
*
* Input Parameters:
* ptcb - The tcb of the parent process.
* tcb - The tcb of the child process.
*
* Returned Value:
* This is a NuttX internal function so it follows the convention that
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
int addrenv_join(FAR struct tcb_s *ptcb, FAR struct tcb_s *tcb);
/****************************************************************************
* Name: addrenv_leave
*
* Description:
* Leave a process's address environment.
*
* Input Parameters:
* tcb - The tcb of the process.
*
* Returned Value:
* This is a NuttX internal function so it follows the convention that
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
int addrenv_leave(FAR struct tcb_s *tcb);
/****************************************************************************
* Name: addrenv_select
*
* Description:
* Temporarily select a different address environment for the currently
* running process.
*
* Input Parameters:
* addrenv - The address environment to instantiate.
* oldenv - The old active address environment is placed here.
*
* Returned Value:
* This is a NuttX internal function so it follows the convention that
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
int addrenv_select(FAR struct addrenv_s *addrenv,
FAR struct addrenv_s **oldenv);
/****************************************************************************
* Name: addrenv_restore
*
* Description:
* Switch back to the procces's previous address environment.
*
* Input Parameters:
* addrenv - The address environment to restore.
*
* Returned Value:
* This is a NuttX internal function so it follows the convention that
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
int addrenv_restore(FAR struct addrenv_s *addrenv);
/****************************************************************************
* Name: addrenv_take
*
* Description:
* Take a reference to an address environment.
*
* Input Parameters:
* addrenv - The address environment.
*
* Returned Value:
* None.
*
****************************************************************************/
void addrenv_take(FAR struct addrenv_s *addrenv);
/****************************************************************************
* Name: addrenv_give
*
* Description:
* Give back a reference to an address environment, obtaining the resulting
* reference counter as returned value.
*
* Input Parameters:
* addrenv - The address environment.
*
* Returned Value:
* Remaining reference count.
*
****************************************************************************/
int addrenv_give(FAR struct addrenv_s *addrenv);
/****************************************************************************
* Name: addrenv_drop
*
* Description:
* Drop an address environment.
*
* Input Parameters:
* addrenv - The address environment.
* deferred - yes: The address environment should be dropped by the worker
* no: The address environment can be dropped at once
*
* Returned Value:
* None.
*
****************************************************************************/
void addrenv_drop(FAR struct addrenv_s *addrenv, bool deferred);
/****************************************************************************
* Address Environment Interfaces
*
* Low-level interfaces used in binfmt/ to instantiate tasks with address
* environments. These interfaces all operate on type arch_addrenv_t which
* is an abstract representation of a task group's address environment and
* must be defined in arch/arch.h if CONFIG_ARCH_ADDRENV is defined.
*
* up_addrenv_create - Create an address environment
* up_addrenv_destroy - Destroy an address environment.
* up_addrenv_vtext - Returns the virtual base address of the .text
* address environment
* up_addrenv_vdata - Returns the virtual base address of the .bss/.data
* address environment
* up_addrenv_vheap - Returns the virtual base address of the heap
* address environment
* up_addrenv_heapsize - Returns the size of the initial heap allocation.
* up_addrenv_select - Instantiate an address environment
* up_addrenv_clone - Copy an address environment from one location to
* another.
*
* 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_clone().
*
* 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 group address
* environment.
* up_addrenv_detach - Release the thread's reference to an address
* environment when a task/thread exits.
*
* CONFIG_ARCH_STACK_DYNAMIC=y indicates that the user process stack resides
* in its own address space. This options is also *required* if
* CONFIG_BUILD_KERNEL and CONFIG_LIBC_EXECFUNCS are selected. Why?
* Because the caller's stack must be preserved in its own address space
* when we instantiate the environment of the new process in order to
* initialize it.
*
* NOTE: The naming of the CONFIG_ARCH_STACK_DYNAMIC selection implies that
* dynamic stack allocation is supported. Certainly this option must be set
* if dynamic stack allocation is supported by a platform. But the more
* general meaning of this configuration environment is simply that the
* stack has its own address space.
*
* If CONFIG_ARCH_STACK_DYNAMIC=y is selected then the platform specific
* code must export these additional interfaces:
*
* up_addrenv_ustackalloc - Create a stack address environment
* up_addrenv_ustackfree - Destroy a stack address environment.
* up_addrenv_vustack - Returns the virtual base address of the stack
* up_addrenv_ustackselect - Instantiate a stack address environment
*
* If CONFIG_ARCH_KERNEL_STACK is selected, then each user process will have
* two stacks: (1) a large (and possibly dynamic) user stack and (2) a
* smaller kernel stack. However, this option is *required* if both
* CONFIG_BUILD_KERNEL and CONFIG_LIBC_EXECFUNCS are selected. Why? Because
* when we instantiate and initialize the address environment of the new
* user process, we will temporarily lose the address environment of the old
* user process, including its stack contents. The kernel C logic will crash
* immediately with no valid stack in place.
*
* If CONFIG_ARCH_STACK_DYNAMIC=y is selected then the platform specific
* code must export these additional interfaces:
*
* up_addrenv_kstackalloc - Create a stack in the kernel address
* environment
* up_addrenv_kstackfree - Destroy the kernel stack.
*
****************************************************************************/
/* Prototyped in include/nuttx/arch.h as part of the OS/platform interface */
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_ARCH_ADDRENV */
#endif /* __INCLUDE_NUTTX_ADDRENV_H */
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