41956b5742
To support showing CBMEM logs on recovery screen, add a function cbmem_console_snapshot() to copy the CBMEM console to an allocated buffer. Non-printable characters are automatically replaced with '?' to ensure the returned string is printable. BRANCH=none BUG=b:146105976 TEST=emerge-nami libpayload Change-Id: Ie324055f5fd8276f1d833fc9d04f60a792dbb9f6 Signed-off-by: Yu-Ping Wu <yupingso@chromium.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/37667 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Hung-Te Lin <hungte@chromium.org>
124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
/*
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* This file is part of the libpayload project.
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*
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* Copyright (c) 2012 Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <libpayload.h>
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#include <stdint.h>
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struct cbmem_console {
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uint32_t size;
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uint32_t cursor;
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uint8_t body[0];
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} __packed;
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#define CURSOR_MASK ((1 << 28) - 1)
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#define OVERFLOW (1 << 31)
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static struct cbmem_console *cbmem_console_p;
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static struct console_output_driver cbmem_console_driver =
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{
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.write = &cbmem_console_write,
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};
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static void do_write(const void *buffer, size_t count)
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{
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memcpy(cbmem_console_p->body + (cbmem_console_p->cursor & CURSOR_MASK),
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buffer, count);
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cbmem_console_p->cursor += count;
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}
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void cbmem_console_init(void)
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{
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cbmem_console_p = lib_sysinfo.cbmem_cons;
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if (cbmem_console_p && cbmem_console_p->size)
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console_add_output_driver(&cbmem_console_driver);
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}
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void cbmem_console_write(const void *buffer, size_t count)
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{
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while ((cbmem_console_p->cursor & CURSOR_MASK) + count >=
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cbmem_console_p->size) {
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size_t still_fits = cbmem_console_p->size -
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(cbmem_console_p->cursor & CURSOR_MASK);
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do_write(buffer, still_fits);
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cbmem_console_p->cursor &= ~CURSOR_MASK;
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cbmem_console_p->cursor |= OVERFLOW;
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buffer += still_fits;
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count -= still_fits;
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}
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do_write(buffer, count);
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}
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char *cbmem_console_snapshot(void)
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{
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const struct cbmem_console *console_p = cbmem_console_p;
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char *console_c;
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uint32_t size, cursor, overflow;
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if (!console_p) {
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printf("ERROR: No cbmem console found in coreboot table\n");
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return NULL;
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}
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cursor = console_p->cursor & CURSOR_MASK;
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overflow = console_p->cursor & OVERFLOW;
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if (!overflow && cursor < console_p->size)
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size = cursor;
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else
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size = console_p->size;
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console_c = malloc(size + 1);
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if (!console_c) {
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printf("ERROR: Not enough memory for console (size = %u)\n",
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size);
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return NULL;
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}
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console_c[size] = '\0';
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if (overflow) {
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if (cursor >= size) {
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printf("ERROR: CBMEM console struct is corrupted\n");
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return NULL;
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}
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memcpy(console_c, console_p->body + cursor, size - cursor);
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memcpy(console_c + size - cursor, console_p->body, cursor);
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} else {
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memcpy(console_c, console_p->body, size);
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}
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/* Slight memory corruption may occur between reboots and give us a few
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unprintable characters like '\0'. Replace them with '?' on output. */
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for (cursor = 0; cursor < size; cursor++)
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if (!isprint(console_c[cursor]) && !isspace(console_c[cursor]))
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console_c[cursor] = '?';
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return console_c;
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}
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