46b0f6d6ee
VELAPLATFO-12536 This provides the initial hooks for Flattened Device Tree support with QEMU RV. It also provides a new procfs file that exposes the fdt to userspace much like the /sys/firmware/fdt endpoint in Linux. See https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-firmware-ofw Nodes in the fdt are not yet usable by the OS. Signed-off-by: Brennan Ashton <bashton@brennanashton.com> Signed-off-by: liaoao <liaoao@xiaomi.com>
89 lines
3.0 KiB
C
89 lines
3.0 KiB
C
/****************************************************************************
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* include/nuttx/fdt.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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#ifndef __INCLUDE_NUTTX_FDT_H
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#define __INCLUDE_NUTTX_FDT_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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#include <stdint.h>
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#include <nuttx/compiler.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define FDT_MAGIC 0xd00dfeed
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct fdt_header_s
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{
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uint32_t magic;
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uint32_t totalsize;
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uint32_t off_dt_struct;
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uint32_t off_dt_strings;
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uint32_t off_mem_rsvmap;
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uint32_t version;
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uint32_t last_comp_version;
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uint32_t boot_cpuid_phys;
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uint32_t size_dt_strings;
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uint32_t size_dt_struct;
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};
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/****************************************************************************
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* Public Functions Definitions
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****************************************************************************/
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/****************************************************************************
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* Name: fdt_register
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*
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* Description:
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* Store the pointer to the flattened device tree and verify that it at
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* least appears to be valid. This function will not fully parse the FDT.
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*
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* Return:
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* Return -EINVAL if the fdt header does not have the expected magic value.
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* otherwise return OK. If OK is not returned the existing entry for FDT
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* is not modified.
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*
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****************************************************************************/
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int fdt_register(FAR const char *fdt_base);
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/****************************************************************************
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* Name: fdt_get
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*
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* Description:
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* Return the pointer to a raw FDT. NULL is returned if no FDT has been
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* loaded.
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*
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****************************************************************************/
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FAR const char *fdt_get(void);
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#endif /* __INCLUDE_NUTTX_FDT_H */
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