28cee59ca2
VPD reference: https://chromium.googlesource.com/chromiumos/platform/vpd/+/master/README.md Copy ChromeOS VPD driver to add support for VPD without CROMEOS. Possible use case: * Storing calibration data * Storing MAC address * Storing serial * Storing boot options + Now it's possible to define the VPD space by choosing one of the following enums: VPD_ANY, VPD_RW, VPD_RO. + CHROMEOS selects now VPD as part of it. + VPD is implemented as driver. Change-Id: Id9263bd39bf25d024e93daa57053fefcb1adc53a Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Reviewed-on: https://review.coreboot.org/25046 Reviewed-by: David Hendricks <david.hendricks@gmail.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
/*
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* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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*/
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#include <assert.h>
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#include "lib_vpd.h"
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/* Given an encoded string, this functions decodes the length field which varies
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* from 1 byte to many bytes.
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*
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* The in points the actual byte going to be decoded. The *length returns
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* the decoded length field. The number of consumed bytes will be stroed in
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* decoded_len.
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*
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* Returns VPD_FAIL if more bit is 1, but actually reaches the end of string.
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*/
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int decodeLen(const int32_t max_len,
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const uint8_t *in,
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int32_t *length,
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int32_t *decoded_len)
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{
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uint8_t more;
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int i = 0;
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assert(length);
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assert(decoded_len);
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*length = 0;
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do {
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if (i >= max_len)
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return VPD_FAIL;
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more = in[i] & 0x80;
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*length <<= 7;
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*length |= in[i] & 0x7f;
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++i;
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} while (more);
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*decoded_len = i;
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return VPD_OK;
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}
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/* Given the encoded string, this function invokes callback with extracted
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* (key, value). The *consumed will be plused the number of bytes consumed in
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* this function.
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*
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* The input_buf points to the first byte of the input buffer.
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*
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* The *consumed starts from 0, which is actually the next byte to be decoded.
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* It can be non-zero to be used in multiple calls.
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*
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* If one entry is successfully decoded, sends it to callback and returns the
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* result.
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*/
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int decodeVpdString(const int32_t max_len,
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const uint8_t *input_buf,
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int32_t *consumed,
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VpdDecodeCallback callback,
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void *callback_arg)
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{
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int type;
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int32_t key_len, value_len;
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int32_t decoded_len;
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const uint8_t *key, *value;
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/* type */
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if (*consumed >= max_len)
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return VPD_FAIL;
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type = input_buf[*consumed];
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switch (type) {
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case VPD_TYPE_INFO:
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case VPD_TYPE_STRING:
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(*consumed)++;
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/* key */
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if (VPD_OK != decodeLen(max_len - *consumed,
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&input_buf[*consumed], &key_len,
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&decoded_len) ||
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*consumed + decoded_len >= max_len) {
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return VPD_FAIL;
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}
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*consumed += decoded_len;
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key = &input_buf[*consumed];
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*consumed += key_len;
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/* value */
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if (VPD_OK != decodeLen(max_len - *consumed,
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&input_buf[*consumed],
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&value_len, &decoded_len) ||
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*consumed + decoded_len > max_len) {
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return VPD_FAIL;
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}
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*consumed += decoded_len;
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value = &input_buf[*consumed];
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*consumed += value_len;
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if (type == VPD_TYPE_STRING)
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return callback(key, key_len, value, value_len,
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callback_arg);
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return VPD_OK;
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default:
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return VPD_FAIL;
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break;
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}
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return VPD_OK;
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}
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