591e79bc76
Add support for early boot access to NVRAM variables, using a new bhnd_nvram_data_getvar_direct() API to support zero-allocation direct reading of NVRAM variables from a bhnd_nvram_io instance backed by the CFE NVRAM device. Approved by: adrian (mentor) Differential Revision: https://reviews.freebsd.org/D9913
77 lines
2.7 KiB
C
77 lines
2.7 KiB
C
/*-
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* Copyright (c) 2015-2016 Landon Fuller <landonf@FreeBSD.org>
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* All rights reserved.
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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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* 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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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
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* redistribution must be conditioned upon including a substantially
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* similar Disclaimer requirement for further binary redistribution.
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*
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* NO WARRANTY
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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 NONINFRINGEMENT, MERCHANTIBILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGES.
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*
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* $FreeBSD$
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*/
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#ifndef _BHND_NVRAM_BHND_NVRAM_BCMVAR_H_
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#define _BHND_NVRAM_BHND_NVRAM_BCMVAR_H_
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#define BCM_NVRAM_ENCODE_OPT_VERSION "bcm_version"
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/**
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* BCM NVRAM header value data.
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*/
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union bhnd_nvram_bcm_hvar_value {
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uint16_t u16;
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uint32_t u32;
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};
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/**
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* Internal representation of BCM NVRAM values that mirror (and must be
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* vended as) NVRAM variables.
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*/
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struct bhnd_nvram_bcm_hvar {
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const char *name; /**< variable name */
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bhnd_nvram_type type; /**< value type */
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size_t nelem; /**< value element count */
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size_t len; /**< value length */
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const char *envp; /**< Pointer to the NVRAM variable mirroring
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this header value, or NULL. */
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bool stale; /**< header value does not match
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mirrored NVRAM value */
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/** variable data */
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union bhnd_nvram_bcm_hvar_value value;
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};
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/** BCM NVRAM header */
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struct bhnd_nvram_bcmhdr {
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uint32_t magic;
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uint32_t size;
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uint32_t cfg0; /**< crc:8, version:8, sdram_init:16 */
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uint32_t cfg1; /**< sdram_config:16, sdram_refresh:16 */
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uint32_t sdram_ncdl; /**< sdram_ncdl */
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} __packed;
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int bhnd_nvram_bcm_getvar_direct_common(struct bhnd_nvram_io *io,
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const char *name, void *outp, size_t *olen, bhnd_nvram_type otype,
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bool have_header);
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#endif /* _BHND_NVRAM_BHND_NVRAM_BCMVAR_H_ */
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