3f67c67aaf
All supported arch uses a push-down stack: The stack grows toward lower addresses in memory. The stack pointer register points to the lowest, valid working address (the "top" of the stack). Items on the stack are referenced as positive(include zero) word offsets from sp. Which means that for stack in the [begin, begin + size): 1.The initial SP point to begin + size 2.push equals sub and then store 3.pop equals load and then add Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
175 lines
5.4 KiB
C
175 lines
5.4 KiB
C
/****************************************************************************
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* arch/or1k/include/arch.h
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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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/* This file should never be included directly but, rather,
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* only indirectly through nuttx/arch.h
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*/
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#ifndef __ARCH_OR1K_INCLUDE_ARCH_H
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#define __ARCH_OR1K_INCLUDE_ARCH_H
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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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#ifndef __ASSEMBLY__
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# include <stdint.h>
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# include <nuttx/pgalloc.h>
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# include <nuttx/addrenv.h>
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#endif
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifdef CONFIG_ARCH_ADDRENV
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#if CONFIG_MM_PGSIZE != 4096
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# error Only pages sizes of 4096 are currently supported (CONFIG_ARCH_ADDRENV)
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#endif
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/* Convert 4KiB pages to 1MiB sections */
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# define __PG2SECT_SHIFT (20 - MM_PGSHIFT)
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# define __PG2SECT_MASK ((1 << __PG2SECT_SHIFT) - 1)
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# define ARCH_PG2SECT(p) (((p) + __PG2SECT_MASK) >> __PG2SECT_SHIFT)
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# define ARCH_SECT2PG(s) ((s) << __PG2SECT_SHIFT)
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# define ARCH_TEXT_NSECTS ARCH_PG2SECT(CONFIG_ARCH_TEXT_NPAGES)
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# define ARCH_DATA_NSECTS ARCH_PG2SECT(CONFIG_ARCH_DATA_NPAGES)
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# define ARCH_HEAP_NSECTS ARCH_PG2SECT(CONFIG_ARCH_HEAP_NPAGES)
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# ifdef CONFIG_MM_SHM
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# define ARCH_SHM_NSECTS ARCH_PG2SECT(ARCH_SHM_MAXPAGES)
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# endif
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# ifdef CONFIG_ARCH_STACK_DYNAMIC
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# define ARCH_STACK_NSECTS ARCH_PG2SECT(CONFIG_ARCH_STACK_NPAGES)
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# endif
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#endif /* CONFIG_ARCH_ADDRENV */
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/****************************************************************************
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* Inline functions
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****************************************************************************/
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/****************************************************************************
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* Name: or1k_getsp
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****************************************************************************/
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static inline uint32_t or1k_getsp(void)
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{
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uint32_t sp;
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__asm__
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(
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"\tmov %0, sp\n\t"
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: "=r"(sp)
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);
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return sp;
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}
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/****************************************************************************
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* Public Types
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****************************************************************************/
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#ifdef CONFIG_ARCH_ADDRENV
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/* The task group resources are retained in a single structure, task_group_s
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* that is defined in the header file nuttx/include/nuttx/sched.h. The type
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* group_addrenv_t must be defined by platform specific logic in
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* nuttx/arch/<architecture>/include/arch.h.
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*
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* These tables would hold the physical address of the level 2 page tables.
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* All would be initially NULL and would not be backed up with physical
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* memory until mappings in the level 2 page table are required.
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*/
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struct group_addrenv_s
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{
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/* Level 1 page table entries for each group section */
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FAR uintptr_t *text[ARCH_TEXT_NSECTS];
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FAR uintptr_t *data[ARCH_DATA_NSECTS];
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#ifdef CONFIG_BUILD_KERNEL
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FAR uintptr_t *heap[ARCH_HEAP_NSECTS];
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#ifdef CONFIG_MM_SHM
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FAR uintptr_t *shm[ARCH_SHM_NSECTS];
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#endif
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/* Initial heap allocation (in bytes). This exists only provide an
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* indirect path for passing the size of the initial heap to the heap
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* initialization logic. These operations are separated in time and
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* architecture. REVISIT: I would like a better way to do this.
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*/
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size_t heapsize;
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#endif
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};
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typedef struct group_addrenv_s group_addrenv_t;
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/* This type is used when the OS needs to temporarily instantiate a
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* different address environment. Used in the implementation of
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*
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* int up_addrenv_select(group_addrenv_t addrenv, save_addrenv_t *oldenv);
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* int up_addrenv_restore(save_addrenv_t oldenv);
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*
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* In this case, the saved valued in the L1 page table are returned
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*/
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struct save_addrenv_s
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{
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FAR uint32_t text[ARCH_TEXT_NSECTS];
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FAR uint32_t data[ARCH_DATA_NSECTS];
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#ifdef CONFIG_BUILD_KERNEL
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FAR uint32_t heap[ARCH_HEAP_NSECTS];
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#ifdef CONFIG_MM_SHM
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FAR uint32_t shm[ARCH_SHM_NSECTS];
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#endif
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#endif
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};
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typedef struct save_addrenv_s save_addrenv_t;
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#endif
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ARCH_OR1K_INCLUDE_ARCH_H */
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