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/****************************************************************************
* arch/arm/include/arch.h
*
* Copyright (C) 2007-2009 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.
*
****************************************************************************/
/* This file should never be included directed but, rather,
* only indirectly through nuttx/arch.h
*/
#ifndef __ARCH_ARM_INCLUDE_ARCH_H
#define __ARCH_ARM_INCLUDE_ARCH_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifndef __ASSEMBLY__
# include <stdint.h>
# include <nuttx/pgalloc.h>
#endif
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifdef CONFIG_PIC
/* This identifies the register the is used by the processor as the PIC base
* register. It is usually r9 or r10
*/
#define PIC_REG r10
#define PIC_REG_STRING "r10"
/* Macros to get and set the PIC base register. picbase is assumed to be
* of type (void*) and that it will fit into a uint32_t. These must be
* inline so that they will be compatible with the ABIs rules for
* preserving the PIC register
*/
#define up_getpicbase(ppicbase) \
do { \
uint32_t picbase; \
__asm__ \
( \
"\tmov %0, " PIC_REG_STRING "\n\t" \
: "=r"(picbase) \
); \
*ppicbase = (FAR void*)picbase; \
} while (0)
#define up_setpicbase(picbase) \
do { \
uint32_t _picbase = (uint32_t)picbase; \
__asm__ \
( \
"\tmov " PIC_REG_STRING ", %0\n\t" \
: : "r"(_picbase) : PIC_REG_STRING \
); \
} while (0)
#endif
#ifdef CONFIG_ARCH_ADDRENV
#if CONFIG_MM_PGSIZE != 4096
# error Only pages sizes of 4096 are currently supported (CONFIG_ARCH_ADDRENV)
#endif
/* Convert 4KiB pages to 1MiB sections */
# define __PG2SECT_SHIFT (20 - MM_PGSHIFT)
# define __PG2SECT_MASK ((1 << __PG2SECT_SHIFT) - 1)
# define ARCH_PG2SECT(p) (((p) + __PG2SECT_MASK) >> __PG2SECT_SHIFT)
# define ARCH_SECT2PG(s) ((s) << __PG2SECT_SHIFT)
# define ARCH_TEXT_NSECTS ARCH_PG2SECT(CONFIG_ARCH_TEXT_NPAGES)
# define ARCH_DATA_NSECTS ARCH_PG2SECT(CONFIG_ARCH_DATA_NPAGES)
# define ARCH_HEAP_NSECTS ARCH_PG2SECT(CONFIG_ARCH_HEAP_NPAGES)
# define ARCH_STACK_NSECTS ARCH_PG2SECT(CONFIG_ARCH_STACK_NPAGES)
#endif
/****************************************************************************
* Inline functions
****************************************************************************/
/****************************************************************************
* Public Types
****************************************************************************/
#ifdef CONFIG_ARCH_ADDRENV
/* The task group resources are retained in a single structure, task_group_s
* that is defined in the header file nuttx/include/nuttx/sched.h. The type
* group_addrenv_t must be defined by platform specific logic in
* nuttx/arch/<architecture>/include/arch.h.
*
* These tables would hold the physical address of the level 2 page tables.
* All would be initially NULL and would not be backed up with physical memory
* until mappings in the level 2 page table are required.
*/
struct group_addrenv_s
{
FAR uint32_t *text[ARCH_TEXT_NSECTS];
FAR uint32_t *data[ARCH_DATA_NSECTS];
#if 0 /* Not yet implemented */
FAR uint32_t *heap[ARCH_HEAP_NSECTS];
#endif
};
typedef struct group_addrenv_s group_addrenv_t;
/* This type is used when the OS needs to temporarily instantiate a
* different address environment. Used in the implementation of
*
* int up_addrenv_select(group_addrenv_t addrenv, save_addrenv_t *oldenv);
* int up_addrenv_restore(save_addrenv_t oldenv);
*
* In this case, the saved valued in the L1 page table are returned
*/
struct save_addrenv_s
{
FAR uint32_t text[ARCH_TEXT_NSECTS];
FAR uint32_t data[ARCH_DATA_NSECTS];
#if 0 /* Not yet implemented */
FAR uint32_t heap[ARCH_HEAP_NSECTS];
#endif
};
typedef struct save_addrenv_s save_addrenv_t;
#endif
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __ARCH_ARM_INCLUDE_ARCH_H */
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