1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2011 The ChromiumOS Authors. All rights reserved. 4 */ 5 6 #include <common.h> 7 #include <console.h> 8 #ifndef CONFIG_SYS_COREBOOT 9 #error This driver requires coreboot 10 #endif 11 12 #include <asm/arch/sysinfo.h> 13 14 struct cbmem_console { 15 u32 buffer_size; 16 u32 buffer_cursor; 17 u8 buffer_body[0]; 18 } __attribute__ ((__packed__)); 19 20 static struct cbmem_console *cbmem_console_p; 21 22 void cbmemc_putc(struct stdio_dev *dev, char data) 23 { 24 int cursor; 25 26 cursor = cbmem_console_p->buffer_cursor++; 27 if (cursor < cbmem_console_p->buffer_size) 28 cbmem_console_p->buffer_body[cursor] = data; 29 } 30 31 void cbmemc_puts(struct stdio_dev *dev, const char *str) 32 { 33 char c; 34 35 while ((c = *str++) != 0) 36 cbmemc_putc(dev, c); 37 } 38 39 int cbmemc_init(void) 40 { 41 int rc; 42 struct stdio_dev cons_dev; 43 cbmem_console_p = lib_sysinfo.cbmem_cons; 44 45 memset(&cons_dev, 0, sizeof(cons_dev)); 46 47 strcpy(cons_dev.name, "cbmem"); 48 cons_dev.flags = DEV_FLAGS_OUTPUT; /* Output only */ 49 cons_dev.putc = cbmemc_putc; 50 cons_dev.puts = cbmemc_puts; 51 52 rc = stdio_register(&cons_dev); 53 54 return (rc == 0) ? 1 : rc; 55 } 56