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<title>LCOV - skiboot.info - libflash/ecc.h</title>
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<td width="10%" class="headerItem">Current view:</td>
<td width="35%" class="headerValue"><a href="../index.html">top level</a> - <a href="index.html">libflash</a> - ecc.h<span style="font-size: 80%;"> (source / <a href="ecc.h.func-sort-c.html">functions</a>)</span></td>
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<td width="10%" class="headerCovTableHead">Hit</td>
<td width="10%" class="headerCovTableHead">Total</td>
<td width="15%" class="headerCovTableHead">Coverage</td>
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<td class="headerItem">Test:</td>
<td class="headerValue">skiboot.info</td>
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<td class="headerItem">Lines:</td>
<td class="headerCovTableEntry">6</td>
<td class="headerCovTableEntry">8</td>
<td class="headerCovTableEntryMed">75.0 %</td>
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<td class="headerItem">Date:</td>
<td class="headerValue">2022-05-24 17:20:14</td>
<td></td>
<td class="headerItem">Functions:</td>
<td class="headerCovTableEntry">3</td>
<td class="headerCovTableEntry">4</td>
<td class="headerCovTableEntryMed">75.0 %</td>
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<td class="headerItem">Branches:</td>
<td class="headerCovTableEntry">0</td>
<td class="headerCovTableEntry">0</td>
<td class="headerCovTableEntryHi">-</td>
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<pre class="sourceHeading"> Branch data Line data Source code</pre>
<pre class="source">
<a name="1"><span class="lineNum"> 1 </span> : : // SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later</a>
<a name="2"><span class="lineNum"> 2 </span> : : /*</a>
<a name="3"><span class="lineNum"> 3 </span> : : * This is based on the hostboot ecc code</a>
<a name="4"><span class="lineNum"> 4 </span> : : *</a>
<a name="5"><span class="lineNum"> 5 </span> : : * Copyright 2013-2018 IBM Corp.</a>
<a name="6"><span class="lineNum"> 6 </span> : : */</a>
<a name="7"><span class="lineNum"> 7 </span> : : </a>
<a name="8"><span class="lineNum"> 8 </span> : : #ifndef __ECC_H</a>
<a name="9"><span class="lineNum"> 9 </span> : : #define __ECC_H</a>
<a name="10"><span class="lineNum"> 10 </span> : : </a>
<a name="11"><span class="lineNum"> 11 </span> : : #include <stdint.h></a>
<a name="12"><span class="lineNum"> 12 </span> : : #include <ccan/endian/endian.h></a>
<a name="13"><span class="lineNum"> 13 </span> : : </a>
<a name="14"><span class="lineNum"> 14 </span> : : struct ecc64 {</a>
<a name="15"><span class="lineNum"> 15 </span> : : beint64_t data;</a>
<a name="16"><span class="lineNum"> 16 </span> : : uint8_t ecc;</a>
<a name="17"><span class="lineNum"> 17 </span> : : } __attribute__((__packed__));</a>
<a name="18"><span class="lineNum"> 18 </span> : : </a>
<a name="19"><span class="lineNum"> 19 </span> : : extern int memcpy_from_ecc(beint64_t *dst, struct ecc64 *src, uint64_t len);</a>
<a name="20"><span class="lineNum"> 20 </span> : : extern int memcpy_from_ecc_unaligned(beint64_t *dst, struct ecc64 *src, uint64_t len,</a>
<a name="21"><span class="lineNum"> 21 </span> : : uint8_t alignment);</a>
<a name="22"><span class="lineNum"> 22 </span> : : </a>
<a name="23"><span class="lineNum"> 23 </span> : : extern int memcpy_to_ecc(struct ecc64 *dst, const beint64_t *src, uint64_t len);</a>
<a name="24"><span class="lineNum"> 24 </span> : : extern int memcpy_to_ecc_unaligned(struct ecc64 *dst, const beint64_t *src, uint64_t len,</a>
<a name="25"><span class="lineNum"> 25 </span> : : uint8_t alignment);</a>
<a name="26"><span class="lineNum"> 26 </span> : : </a>
<a name="27"><span class="lineNum"> 27 </span> : : /*</a>
<a name="28"><span class="lineNum"> 28 </span> : : * Calculate the size of a buffer if ECC is added</a>
<a name="29"><span class="lineNum"> 29 </span> : : *</a>
<a name="30"><span class="lineNum"> 30 </span> : : * We add 1 byte of ecc for every 8 bytes of data. So we need to round up to 8</a>
<a name="31"><span class="lineNum"> 31 </span> : : * bytes length and then add 1/8</a>
<a name="32"><span class="lineNum"> 32 </span> : : */</a>
<a name="33"><span class="lineNum"> 33 </span> : : #ifndef ALIGN_UP</a>
<a name="34"><span class="lineNum"> 34 </span> : : #define ALIGN_UP(_v, _a) (((_v) + (_a) - 1) & ~((_a) - 1))</a>
<a name="35"><span class="lineNum"> 35 </span> : : #endif</a>
<a name="36"><span class="lineNum"> 36 </span> : : </a>
<a name="37"><span class="lineNum"> 37 </span> : : #define BYTES_PER_ECC 8</a>
<a name="38"><span class="lineNum"> 38 </span> : : </a>
<a name="39"><span class="lineNum"> 39 </span> :<span class="lineCov"> 119 : static inline uint64_t ecc_size(uint64_t len)</span></a>
<a name="40"><span class="lineNum"> 40 </span> : : {</a>
<a name="41"><span class="lineNum"> 41 </span> :<span class="lineCov"> 119 : return ALIGN_UP(len, BYTES_PER_ECC) >> 3;</span></a>
<a name="42"><span class="lineNum"> 42 </span> : : }</a>
<a name="43"><span class="lineNum"> 43 </span> : : </a>
<a name="44"><span class="lineNum"> 44 </span> :<span class="lineCov"> 119 : static inline uint64_t ecc_buffer_size(uint64_t len)</span></a>
<a name="45"><span class="lineNum"> 45 </span> : : {</a>
<a name="46"><span class="lineNum"> 46 </span> :<span class="lineCov"> 119 : return ALIGN_UP(len, BYTES_PER_ECC) + ecc_size(len);</span></a>
<a name="47"><span class="lineNum"> 47 </span> : : }</a>
<a name="48"><span class="lineNum"> 48 </span> : : </a>
<a name="49"><span class="lineNum"> 49 </span> : : static inline int ecc_buffer_size_check(uint64_t len)</a>
<a name="50"><span class="lineNum"> 50 </span> : : {</a>
<a name="51"><span class="lineNum"> 51 </span> : : return len % (BYTES_PER_ECC + 1);</a>
<a name="52"><span class="lineNum"> 52 </span> : : }</a>
<a name="53"><span class="lineNum"> 53 </span> : : </a>
<a name="54"><span class="lineNum"> 54 </span> :<span class="lineNoCov"> 0 : static inline uint64_t ecc_buffer_size_minus_ecc(uint64_t len)</span></a>
<a name="55"><span class="lineNum"> 55 </span> : : {</a>
<a name="56"><span class="lineNum"> 56 </span> :<span class="lineNoCov"> 0 : return len * BYTES_PER_ECC / (BYTES_PER_ECC + 1);</span></a>
<a name="57"><span class="lineNum"> 57 </span> : : }</a>
<a name="58"><span class="lineNum"> 58 </span> : : </a>
<a name="59"><span class="lineNum"> 59 </span> :<span class="lineCov"> 123 : static inline uint64_t ecc_buffer_align(uint64_t start, uint64_t pos)</span></a>
<a name="60"><span class="lineNum"> 60 </span> : : {</a>
<a name="61"><span class="lineNum"> 61 </span> :<span class="lineCov"> 123 : return pos - ((pos - start) % (BYTES_PER_ECC + 1));</span></a>
<a name="62"><span class="lineNum"> 62 </span> : : }</a>
<a name="63"><span class="lineNum"> 63 </span> : : </a>
<a name="64"><span class="lineNum"> 64 </span> : : #endif</a>
</pre>
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