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/* Copyright 2013-2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <skiboot.h>
#include <vpd.h>
#include <string.h>
#include <fsp.h>
#include <device.h>
#define CHECK_SPACE(_p, _n, _e) (((_e) - (_p)) >= (_n))
/* Low level keyword search in a record. Can be used when we
* need to find the next keyword of a given type, for example
* when having multiple MF/SM keyword pairs
*/
const void *vpd_find_keyword(const void *rec, size_t rec_sz,
const char *kw, uint8_t *kw_size)
{
const uint8_t *p = rec, *end = rec + rec_sz;
while (CHECK_SPACE(p, 3, end)) {
uint8_t k1 = *(p++);
uint8_t k2 = *(p++);
uint8_t sz = *(p++);
if (k1 == kw[0] && k2 == kw[1]) {
if (kw_size)
*kw_size = sz;
return p;
}
p += sz;
}
return NULL;
}
/* Locate a record in a VPD blob
*
* Note: This works with VPD LIDs. It will scan until it finds
* the first 0x84, so it will skip all those 0's that the VPD
* LIDs seem to contain
*/
const void *vpd_find_record(const void *vpd, size_t vpd_size,
const char *record, size_t *sz)
{
const uint8_t *p = vpd, *end = vpd + vpd_size;
bool first_start = true;
size_t rec_sz;
uint8_t namesz = 0;
const char *rec_name;
while (CHECK_SPACE(p, 4, end)) {
/* Get header byte */
if (*(p++) != 0x84) {
/* Skip initial crap in VPD LIDs */
if (first_start)
continue;
break;
}
first_start = false;
rec_sz = *(p++);
rec_sz |= *(p++) << 8;
if (!CHECK_SPACE(p, rec_sz, end)) {
prerror("VPD: Malformed or truncated VPD,"
" record size doesn't fit\n");
return NULL;
}
/* Find record name */
rec_name = vpd_find_keyword(p, rec_sz, "RT", &namesz);
if (rec_name && strncmp(record, rec_name, namesz) == 0) {
*sz = rec_sz;
return p;
}
p += rec_sz;
if (*(p++) != 0x78) {
prerror("VPD: Malformed or truncated VPD,"
" missing final 0x78 in record %.4s\n",
rec_name ? rec_name : "????");
return NULL;
}
}
return NULL;
}
/* Locate a keyword in a record in a VPD blob
*
* Note: This works with VPD LIDs. It will scan until it finds
* the first 0x84, so it will skip all those 0's that the VPD
* LIDs seem to contain
*/
const void *vpd_find(const void *vpd, size_t vpd_size,
const char *record, const char *keyword,
uint8_t *sz)
{
size_t rec_sz;
const uint8_t *p;
p = vpd_find_record(vpd, vpd_size, record, &rec_sz);
if (p)
p = vpd_find_keyword(p, rec_sz, keyword, sz);
return p;
}
/* Helper to load a VPD LID. Pass a ptr to the corresponding LX keyword */
static void *vpd_lid_load(const uint8_t *lx, uint8_t lxrn, size_t *size)
{
/* Now this is a guess game as we don't have the info from the
* pHyp folks. But basically, it seems to boil down to loading
* a LID whose name is 0x80e000yy where yy is the last 2 digits
* of the LX record in hex.
*
* [ Correction: After a chat with some folks, it looks like it's
* actually 4 digits, though the lid number is limited to fff
* so we weren't far off. ]
*
* For safety, we look for a matching LX record in an LXRn
* (n = lxrn argument) or in VINI if lxrn=0xff
*/
uint32_t lid_no = 0x80e00000 | ((lx[6] & 0xf) << 8) | lx[7];
/* We don't quite know how to get to the LID directory so
* we don't know the size. Let's allocate 16K. All the VPD LIDs
* I've seen so far are much smaller.
*/
#define VPD_LID_MAX_SIZE 0x4000
void *data = malloc(VPD_LID_MAX_SIZE);
char record[4] = "LXR0";
const void *valid_lx;
uint8_t lx_size;
int rc;
if (!data) {
prerror("VPD: Failed to allocate memory for LID\n");
return NULL;
}
/* Adjust LID number for flash side */
lid_no = fsp_adjust_lid_side(lid_no);
printf("VPD: Trying to load VPD LID 0x%08x...\n", lid_no);
*size = VPD_LID_MAX_SIZE;
/* Load it from the FSP */
rc = fsp_fetch_data(0, FSP_DATASET_NONSP_LID, lid_no, 0, data, size);
if (rc) {
prerror("VPD: Error %d loading VPD LID\n", rc);
goto fail;
}
/* Validate it */
if (lxrn < 9)
record[3] = '0' + lxrn;
else
memcpy(record, "VINI", 4);
valid_lx = vpd_find(data, *size, record, "LX", &lx_size);
if (!valid_lx || lx_size != 8) {
prerror("VPD: Cannot find validation LX record\n");
goto fail;
}
if (memcmp(valid_lx, lx, 8) != 0) {
prerror("VPD: LX record mismatch !\n");
goto fail;
}
printf("VPD: Loaded %zu bytes\n", *size);
/* Got it ! */
return realloc(data, *size);
fail:
free(data);
return NULL;
}
void vpd_iohub_load(struct dt_node *hub_node)
{
void *vpd;
size_t sz;
const uint32_t *p;
unsigned int lx_idx;
const char *lxr;
p = dt_prop_get_def(hub_node, "ibm,vpd-lx-info", NULL);
if (!p)
return;
lx_idx = p[0];
lxr = (const char *)&p[1];
vpd = vpd_lid_load(lxr, lx_idx, &sz);
if (!vpd) {
prerror("VPD: Failed to load VPD LID\n");
} else {
dt_add_property(hub_node, "ibm,io-vpd", vpd, sz);
free(vpd);
}
}
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