93 lines
3.1 KiB
C
93 lines
3.1 KiB
C
/****************************************************************************
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* drivers/misc/mkrd.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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* 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 <string.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/drivers/ramdisk.h>
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#ifdef CONFIG_DRVR_MKRD
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mkrd
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*
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* Description:
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* This is a wrapper function around ramdisk_register. It combines the
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* necessary operations to create a RAM disk into a single callable
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* function. Memory for the RAM disk is allocated, appropriated, from
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* the kernel heap (in build modes where there is a distinct kernel heap).
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*
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* Input Parameters:
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* minor: Selects suffix of device named /dev/ramN, N={1,2,3...}
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* nsectors: Number of sectors on device
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* sectize: The size of one sector
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* rdflags: See RDFLAG_* definitions. Typically
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* RDFLAG_WRENABLED | RDFLAG_FUNLINK
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*
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* Returned Value:
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* Zero on success; a negated errno value on failure.
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*
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****************************************************************************/
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int mkrd(int minor, uint32_t nsectors, uint16_t sectsize, uint8_t rdflags)
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{
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FAR uint8_t *buffer;
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int ret;
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/* Allocate the memory backing up the ramdisk from the kernel heap */
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buffer = (FAR uint8_t *)kmm_malloc(sectsize * nsectors);
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if (buffer == NULL)
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{
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ferr("ERROR: kmm_malloc() failed, enable DEBUG_MM for more info!\n");
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return -ENOMEM;
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}
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#ifdef CONFIG_DEBUG_INFO
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memset(buffer, 0, sectsize * nsectors);
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#endif
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finfo("RAMDISK at %p\n", buffer);
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/* Then register the ramdisk */
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ret = ramdisk_register(minor, buffer, nsectors, sectsize, rdflags);
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if (ret < 0)
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{
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ferr("ERROR: ramdisk_register() failed: %d\n", ret);
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kmm_free(buffer);
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}
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return ret;
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}
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#endif /* CONFIG_DRVR_MKRD */
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