cbmem_console.c 1.1 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * Copyright (C) 2011 The ChromiumOS Authors. All rights reserved.
  4. */
  5. #include <common.h>
  6. #include <console.h>
  7. #ifndef CONFIG_SYS_COREBOOT
  8. #error This driver requires coreboot
  9. #endif
  10. #include <asm/cb_sysinfo.h>
  11. struct cbmem_console {
  12. u32 buffer_size;
  13. u32 buffer_cursor;
  14. u8 buffer_body[0];
  15. } __attribute__ ((__packed__));
  16. static struct cbmem_console *cbmem_console_p;
  17. void cbmemc_putc(struct stdio_dev *dev, char data)
  18. {
  19. int cursor;
  20. cursor = cbmem_console_p->buffer_cursor++;
  21. if (cursor < cbmem_console_p->buffer_size)
  22. cbmem_console_p->buffer_body[cursor] = data;
  23. }
  24. void cbmemc_puts(struct stdio_dev *dev, const char *str)
  25. {
  26. char c;
  27. while ((c = *str++) != 0)
  28. cbmemc_putc(dev, c);
  29. }
  30. int cbmemc_init(void)
  31. {
  32. int rc;
  33. struct stdio_dev cons_dev;
  34. cbmem_console_p = lib_sysinfo.cbmem_cons;
  35. memset(&cons_dev, 0, sizeof(cons_dev));
  36. strcpy(cons_dev.name, "cbmem");
  37. cons_dev.flags = DEV_FLAGS_OUTPUT; /* Output only */
  38. cons_dev.putc = cbmemc_putc;
  39. cons_dev.puts = cbmemc_puts;
  40. rc = stdio_register(&cons_dev);
  41. return (rc == 0) ? 1 : rc;
  42. }