![Al Viro](/assets/img/avatar_default.png)
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
252 lines
13 KiB
C
252 lines
13 KiB
C
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// vim:tw=110:ts=4:
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/************************************************************************************************************
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*
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* FILE : mmd.c
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*
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* DATE : $Date: 2004/07/23 11:57:45 $ $Revision: 1.4 $
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* Original: 2004/05/28 14:05:35 Revision: 1.32 Tag: hcf7_t20040602_01
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* Original: 2004/05/13 15:31:45 Revision: 1.30 Tag: hcf7_t7_20040513_01
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* Original: 2004/04/15 09:24:42 Revision: 1.25 Tag: hcf7_t7_20040415_01
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* Original: 2004/04/08 15:18:17 Revision: 1.24 Tag: t7_20040413_01
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* Original: 2004/04/01 15:32:55 Revision: 1.22 Tag: t7_20040401_01
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* Original: 2004/03/10 15:39:28 Revision: 1.18 Tag: t20040310_01
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* Original: 2004/03/03 14:10:12 Revision: 1.16 Tag: t20040304_01
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* Original: 2004/03/02 09:27:12 Revision: 1.14 Tag: t20040302_03
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* Original: 2004/02/24 13:00:29 Revision: 1.12 Tag: t20040224_01
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* Original: 2004/01/30 09:59:33 Revision: 1.11 Tag: t20040219_01
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*
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* AUTHOR : Nico Valster
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*
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* DESC : Common routines for HCF, MSF, UIL as well as USF sources
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*
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* Note: relative to Asserts, the following can be observed:
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* Since the IFB is not known inside the routine, the macro HCFASSERT is replaced with MDDASSERT.
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* Also the line number reported in the assert is raised by FILE_NAME_OFFSET (20000) to discriminate the
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* MMD Asserts from HCF and DHF asserts.
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*
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***************************************************************************************************************
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*
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*
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* SOFTWARE LICENSE
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*
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* This software is provided subject to the following terms and conditions,
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* which you should read carefully before using the software. Using this
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* software indicates your acceptance of these terms and conditions. If you do
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* not agree with these terms and conditions, do not use the software.
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*
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* COPYRIGHT © 2001 - 2004 by Agere Systems Inc. All Rights Reserved
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* All rights reserved.
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*
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* Redistribution and use in source or binary forms, with or without
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* modifications, are permitted provided that the following conditions are met:
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*
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* . Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following Disclaimer as comments in the code as
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* well as in the documentation and/or other materials provided with the
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* distribution.
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*
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* . Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following Disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* . Neither the name of Agere Systems Inc. nor the names of the contributors
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* may be 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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* Disclaimer
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, INFRINGEMENT AND THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. ANY
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* USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE IS SOLELY AT THE USERS OWN
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* RISK. IN NO EVENT SHALL AGERE SYSTEMS INC. OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, INCLUDING, BUT NOT LIMITED TO, CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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*
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**************************************************************************************************************/
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#include "hcf.h" // Needed as long as we do not really sort out the mess
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#include "hcfdef.h" // get CNV_LITTLE_TO_SHORT
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#include "mmd.h" // MoreModularDriver common include file
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//to distinguish DHF from HCF asserts by means of line number
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#undef FILE_NAME_OFFSET
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#define FILE_NAME_OFFSET DHF_FILE_NAME_OFFSET
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/*************************************************************************************************************
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*
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*.MODULE CFG_RANGE_SPEC_STRCT* mmd_check_comp( CFG_RANGES_STRCT *actp, CFG_SUP_RANGE_STRCT *supp )
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*.PURPOSE Checks compatibility between an actor and a supplier.
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*
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*.ARGUMENTS
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* actp
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* supp
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*
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*.RETURNS
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* NULL incompatible
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* <>NULL pointer to matching CFG_RANGE_SPEC_STRCT substructure in actor-structure matching the supplier
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*
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*.NARRATIVE
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*
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* Parameters:
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* actp address of the actor specification
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* supp address of the supplier specification
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*
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* Description: mmd_check_comp is a support routine to check the compatibility between an actor and a
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* supplier. mmd_check_comp is independent of the endianess of the actp and supp structures. This is
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* achieved by checking the "bottom" or "role" fields of these structures. Since these fields are restricted
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* to a limited range, comparing the contents to a value with a known endian-ess gives a clue to their actual
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* endianess.
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*
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*.DIAGRAM
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*1a: The role-field of the actor structure has a known non-zero, not "byte symmetric" value (namely
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* COMP_ROLE_ACT or 0x0001), so if and only the contents of this field matches COMP_ROLE_ACT (in Native
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* Endian format), the actor structure is Native Endian.
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*2a: Since the role-field of the supplier structure is 0x0000, the test as used for the actor does not work
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* for a supplier. A supplier has always exactly 1 variant,top,bottom record with (officially, but see the
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* note below) each of these 3 values in the range 1 through 99, so one byte of the word value of variant,
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* top and bottom words is 0x00 and the other byte is non-zero. Whether the lowest address byte or the
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* highest address byte is non-zero depends on the Endianess of the LTV. If and only if the word value of
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* bottom is less than 0x0100, the supplier is Native Endian.
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* NOTE: the variant field of the supplier structure can not be used for the Endian Detection Algorithm,
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* because a a zero-valued variant has been used as Controlled Deployment indication in the past.
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* Note: An actor may have multiple sets of variant,top,bottom records, including dummy sets with variant,
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* top and bottom fields with a zero-value. As a consequence the endianess of the actor can not be determined
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* based on its variant,top,bottom values.
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*
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* Note: the L and T field of the structures are always in Native Endian format, so you can not draw
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* conclusions concerning the Endianess of the structure based on these two fields.
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*
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*1b/2b
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* The only purpose of the CFG_RANGE_SPEC_BYTE_STRCT is to give easy access to the non-zero byte of the word
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* value of variant, top and bottom. The variables sup_endian and act_endian are used for the supplier and
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* actor structure respectively. These variables must be 0 when the structure has LE format and 1 if the
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* structure has BE format. This can be phrased as:
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* the variable is false (i.e 0x0000) if either
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* (the platform is LE and the LTV is the same as the platform)
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* or
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* (the platform is BE and the LTV differs from the platform).
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* the variable is true (i.e 0x0001) if either
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* (the platform is BE and the LTV is the same as the platform)
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* or
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* (the platform is LE and the LTV differs from the platform).
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*
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* Alternatively this can be phrased as:
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* if the platform is LE
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* if the LTV is LE (i.e the same as the platform), then the variable = 0
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* else (the LTV is BE (i.e. different from the platform) ), then the variable = 1
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* if the platform is BE
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* if the LTV is BE (i.e the same as the platform), then the variable = 1
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* else (the LTV is LE (i.e. different from the platform) ), then the variable = 0
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*
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* This is implemented as:
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* #if HCF_BIG_ENDIAN == 0 //platform is LE
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* sup/act_endian becomes reverse of structure-endianess as determined in 1a/1b
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* #endif
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*6: Each of the actor variant-bottom-top records is checked against the (single) supplier variant-bottom-top
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* range till either an acceptable match is found or all actor records are tried. As explained above, due to
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* the limited ranges of these values, checking a byte is acceptable and suitable.
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*8: depending on whether a match was found or not (as reflected by the value of the control variable of the
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* for loop), the NULL pointer or a pointer to the matching Number/Bottom/Top record of the Actor structure
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* is returned.
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* As an additional safety, checking the supplier length protects against invalid Supplier structures, which
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* may be caused by failing hcf_get_info (in which case the len-field is zero). Note that the contraption
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* "supp->len != sizeof(CFG_SUP_RANGE_STRCT)/sizeof(hcf_16) - 1"
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* did turn out not to work for a compiler which padded the structure definition.
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*
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* Note: when consulting references like DesignNotes and Architecture specifications there is a confusing use
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* of the notions number and variant. This resulted in an inconsistent use in the HCF nomenclature as well.
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* This makes the logic hard to follow and one has to be very much aware of the context when walking through
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* the code.
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* NOTE: The Endian Detection Algorithm places limitations on future extensions of the fields, i.e. they should
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* stay within the currently defined boundaries of 1 through 99 (although 1 through 255) would work as well
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* and there should never be used a zero value for the bottom of a valid supplier.
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* Note: relative to Asserts, the following can be observed:
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* 1: Supplier variant 0x0000 has been used for Controlled Deployment
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* 2: An actor may have one or more variant record specifications with a top of zero and a non-zero bottom
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* to override the HCF default support of a particular variant by the MSF programmer via hcfcfg.h
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* 3: An actor range can be specified as all zeros, e.g. as padding in the automatically generated firmware
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* image files.
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*.ENDDOC END DOCUMENTATION
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*************************************************************************************************************/
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CFG_RANGE_SPEC_STRCT*
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mmd_check_comp( CFG_RANGES_STRCT *actp, CFG_SUP_RANGE_STRCT *supp )
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{
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CFG_RANGE_SPEC_BYTE_STRCT *actq = (CFG_RANGE_SPEC_BYTE_STRCT*)actp->var_rec;
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CFG_RANGE_SPEC_BYTE_STRCT *supq = (CFG_RANGE_SPEC_BYTE_STRCT*)&(supp->variant);
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hcf_16 i;
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int act_endian; //actor endian flag
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int sup_endian; //supplier endian flag
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act_endian = actp->role == COMP_ROLE_ACT; //true if native endian /* 1a */
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sup_endian = supp->bottom < 0x0100; //true if native endian /* 2a */
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#if HCF_ASSERT
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MMDASSERT( supp->len == 6, supp->len )
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MMDASSERT( actp->len >= 6 && actp->len%3 == 0, actp->len )
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if ( act_endian ) { //native endian
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MMDASSERT( actp->role == COMP_ROLE_ACT, actp->role )
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MMDASSERT( 1 <= actp->id && actp->id <= 99, actp->id )
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} else { //non-native endian
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MMDASSERT( actp->role == CNV_END_SHORT(COMP_ROLE_ACT), actp->role )
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MMDASSERT( 1 <= CNV_END_SHORT(actp->id) && CNV_END_SHORT(actp->id) <= 99, actp->id )
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}
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if ( sup_endian ) { //native endian
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MMDASSERT( supp->role == COMP_ROLE_SUPL, supp->role )
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MMDASSERT( 1 <= supp->id && supp->id <= 99, supp->id )
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MMDASSERT( 1 <= supp->variant && supp->variant <= 99, supp->variant )
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MMDASSERT( 1 <= supp->bottom && supp->bottom <= 99, supp->bottom )
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MMDASSERT( 1 <= supp->top && supp->top <= 99, supp->top )
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MMDASSERT( supp->bottom <= supp->top, supp->bottom << 8 | supp->top )
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} else { //non-native endian
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MMDASSERT( supp->role == CNV_END_SHORT(COMP_ROLE_SUPL), supp->role )
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MMDASSERT( 1 <= CNV_END_SHORT(supp->id) && CNV_END_SHORT(supp->id) <= 99, supp->id )
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MMDASSERT( 1 <= CNV_END_SHORT(supp->variant) && CNV_END_SHORT(supp->variant) <= 99, supp->variant )
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MMDASSERT( 1 <= CNV_END_SHORT(supp->bottom) && CNV_END_SHORT(supp->bottom) <=99, supp->bottom )
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MMDASSERT( 1 <= CNV_END_SHORT(supp->top) && CNV_END_SHORT(supp->top) <=99, supp->top )
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MMDASSERT( CNV_END_SHORT(supp->bottom) <= CNV_END_SHORT(supp->top), supp->bottom << 8 | supp->top )
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}
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#endif // HCF_ASSERT
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#if HCF_BIG_ENDIAN == 0
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act_endian = !act_endian; /* 1b*/
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sup_endian = !sup_endian; /* 2b*/
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#endif // HCF_BIG_ENDIAN
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for ( i = actp->len ; i > 3; actq++, i -= 3 ) { /* 6 */
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MMDASSERT( actq->variant[act_endian] <= 99, i<<8 | actq->variant[act_endian] )
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MMDASSERT( actq->bottom[act_endian] <= 99 , i<<8 | actq->bottom[act_endian] )
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MMDASSERT( actq->top[act_endian] <= 99 , i<<8 | actq->top[act_endian] )
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MMDASSERT( actq->bottom[act_endian] <= actq->top[act_endian], i<<8 | actq->bottom[act_endian] )
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if ( actq->variant[act_endian] == supq->variant[sup_endian] &&
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actq->bottom[act_endian] <= supq->top[sup_endian] &&
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actq->top[act_endian] >= supq->bottom[sup_endian]
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) break;
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}
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if ( i <= 3 || supp->len != 6 /*sizeof(CFG_SUP_RANGE_STRCT)/sizeof(hcf_16) - 1 */ ) {
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actq = NULL; /* 8 */
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}
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#if HCF_ASSERT
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if ( actq == NULL ) {
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for ( i = 0; i <= supp->len; i += 2 ) {
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MMDASSERT( DO_ASSERT, MERGE_2( ((hcf_16*)supp)[i], ((hcf_16*)supp)[i+1] ) );
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}
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for ( i = 0; i <= actp->len; i += 2 ) {
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MMDASSERT( DO_ASSERT, MERGE_2( ((hcf_16*)actp)[i], ((hcf_16*)actp)[i+1] ) );
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}
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}
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#endif // HCF_ASSERT
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return (CFG_RANGE_SPEC_STRCT*)actq;
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} // mmd_check_comp
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