108 lines
3.8 KiB
C
108 lines
3.8 KiB
C
/****************************************************************************
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* drivers/mkrd.c
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*
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* Copyright (C) 2019 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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: %d\n", ret);
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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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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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