| /* |
| * This file is part of the libpayload project. |
| * |
| * Copyright (c) 2012 Google Inc. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <libpayload.h> |
| #include <stdint.h> |
| |
| struct cbmem_console { |
| uint32_t size; |
| uint32_t cursor; |
| uint8_t body[0]; |
| } __packed; |
| |
| #define CURSOR_MASK ((1 << 28) - 1) |
| #define OVERFLOW (1 << 31) |
| |
| static struct cbmem_console *cbmem_console_p; |
| |
| static struct console_output_driver cbmem_console_driver = |
| { |
| .write = &cbmem_console_write, |
| }; |
| |
| static void do_write(const void *buffer, size_t count) |
| { |
| memcpy(cbmem_console_p->body + (cbmem_console_p->cursor & CURSOR_MASK), |
| buffer, count); |
| cbmem_console_p->cursor += count; |
| } |
| |
| void cbmem_console_init(void) |
| { |
| cbmem_console_p = lib_sysinfo.cbmem_cons; |
| if (cbmem_console_p && cbmem_console_p->size) |
| console_add_output_driver(&cbmem_console_driver); |
| } |
| |
| void cbmem_console_write(const void *buffer, size_t count) |
| { |
| while ((cbmem_console_p->cursor & CURSOR_MASK) + count >= |
| cbmem_console_p->size) { |
| size_t still_fits = cbmem_console_p->size - |
| (cbmem_console_p->cursor & CURSOR_MASK); |
| do_write(buffer, still_fits); |
| cbmem_console_p->cursor &= ~CURSOR_MASK; |
| cbmem_console_p->cursor |= OVERFLOW; |
| buffer += still_fits; |
| count -= still_fits; |
| } |
| |
| do_write(buffer, count); |
| } |
| |
| char *cbmem_console_snapshot(void) |
| { |
| const struct cbmem_console *console_p = cbmem_console_p; |
| char *console_c; |
| uint32_t size, cursor, overflow; |
| |
| if (!console_p) { |
| printf("ERROR: No cbmem console found in coreboot table\n"); |
| return NULL; |
| } |
| |
| cursor = console_p->cursor & CURSOR_MASK; |
| overflow = console_p->cursor & OVERFLOW; |
| if (!overflow && cursor < console_p->size) |
| size = cursor; |
| else |
| size = console_p->size; |
| |
| console_c = malloc(size + 1); |
| if (!console_c) { |
| printf("ERROR: Not enough memory for console (size = %u)\n", |
| size); |
| return NULL; |
| } |
| console_c[size] = '\0'; |
| |
| if (overflow) { |
| if (cursor >= size) { |
| printf("ERROR: CBMEM console struct is corrupted\n"); |
| return NULL; |
| } |
| memcpy(console_c, console_p->body + cursor, size - cursor); |
| memcpy(console_c + size - cursor, console_p->body, cursor); |
| } else { |
| memcpy(console_c, console_p->body, size); |
| } |
| |
| /* Slight memory corruption may occur between reboots and give us a few |
| unprintable characters like '\0'. Replace them with '?' on output. */ |
| for (cursor = 0; cursor < size; cursor++) |
| if (!isprint(console_c[cursor]) && !isspace(console_c[cursor])) |
| console_c[cursor] = '?'; |
| |
| return console_c; |
| } |