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elogtool: add "clear" command

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Adds "clear" command to cbfsutil/elogtool tool.
"clear" clears the RW_ELOG region by using either:
 * flashrom if no file is provided
 * or using file write if an input file is provided.

The region is filled with ELOG_TYPE_EOL. And a
ELOG_TYPE_LOG_CLEAR event is inserted.

Additionally, it does a minor cleanup to command "list", like:
 * use buffer_end()
 * add "list" to the cmds struct
 * and make elog_read() very similar to elog_write()

Usage:
$ elogtool clear

BUG=b:172210863
TEST=elogtool clear && elogtool list
     elogtool clear -f invalid.raw
     elogtool clear -f valid.raw

Change-Id: Ia28a6eb34c82103ab078a0841b022e2e5e430585
Signed-off-by: Ricardo Quesada <ricardoq@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56883
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
This commit is contained in:
Ricardo Quesada
2021-08-16 11:25:52 -07:00
committed by Furquan Shaikh
parent 6db0f04fa2
commit 49a96a9463
3 changed files with 175 additions and 48 deletions
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40
util/cbfstool/eventlog.c
View File

@@ -11,6 +11,7 @@
#include <commonlib/bsd/elog.h>
#include <vb2_api.h>
#include "common.h"
#include "valstr.h"
#define PATH_PCI_BUS_SHIFT 8
@@ -634,3 +635,42 @@ void eventlog_print_event(const struct event_header *event, int count)
eventlog_printf_ignore_separator_once = 1;
eventlog_printf("\n");
}
/*
* Initializes the eventlog header with the given type and data,
* and calculates the checksum.
* buffer_get() points to the event to be initialized.
* On success it returns 1, otherwise 0.
*/
int eventlog_init_event(const struct buffer *buf, uint8_t type,
const void *data, int data_size)
{
struct event_header *event;
time_t secs = time(NULL);
struct tm tm;
/* Must have at least size for data + checksum byte */
if (buffer_size(buf) < (size_t)data_size + 1)
return 0;
event = buffer_get(buf);
event->type = type;
gmtime_r(&secs, &tm);
elog_fill_timestamp(event, tm.tm_sec, tm.tm_min, tm.tm_hour,
tm.tm_mday, tm.tm_mon, tm.tm_year);
if (data && data_size) {
uint32_t *ptr = (uint32_t *)&event[1];
memcpy(ptr, data, data_size);
}
/* Header + data + checksum */
event->length = sizeof(*event) + data_size + 1;
/* Zero the checksum byte and then compute checksum */
elog_update_checksum(event, 0);
elog_update_checksum(event, -(elog_checksum_event(event)));
return 1;
}