140 lines
4.2 KiB
C
140 lines
4.2 KiB
C
/*
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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[];
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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 uintptr_t 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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struct cbmem_console *const cbmem_cons = phys_to_virt(cbmem_console_p);
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memcpy(cbmem_cons->body + (cbmem_cons->cursor & CURSOR_MASK), buffer, count);
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cbmem_cons->cursor += count;
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}
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void cbmem_console_init(void)
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{
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const struct cbmem_console *const cbmem_cons = phys_to_virt(lib_sysinfo.cbmem_cons);
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cbmem_console_p = lib_sysinfo.cbmem_cons;
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if (cbmem_console_p && cbmem_cons->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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struct cbmem_console *const cbmem_cons = phys_to_virt(cbmem_console_p);
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while ((cbmem_cons->cursor & CURSOR_MASK) + count >=
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cbmem_cons->size) {
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size_t still_fits = cbmem_cons->size - (cbmem_cons->cursor & CURSOR_MASK);
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do_write(buffer, still_fits);
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cbmem_cons->cursor &= ~CURSOR_MASK;
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cbmem_cons->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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static void snapshot_putc(char *console, uint32_t *cursor, char c)
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{
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/* This is BIOS_LOG_IS_MARKER() from coreboot. Due to stupid
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licensing restrictions, we can't use it directly. */
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if (c >= 0x10 && c <= 0x18)
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return;
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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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if (!isprint(c) && !isspace(c))
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console[*cursor] = '?';
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else
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console[*cursor] = c;
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*cursor += 1;
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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 *const console_p = phys_to_virt(cbmem_console_p);
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char *console_c;
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uint32_t size, cursor, overflow, newc, oldc;
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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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newc = 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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for (oldc = cursor; oldc < size; oldc++)
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snapshot_putc(console_c, &newc, console_p->body[oldc]);
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}
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for (oldc = 0; oldc < size && oldc < cursor; oldc++)
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snapshot_putc(console_c, &newc, console_p->body[oldc]);
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console_c[newc] = '\0';
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return console_c;
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}
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