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cbmem_console.c 1.08 KiB
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  • /*
     * Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
     *
    
     * SPDX-License-Identifier:	GPL-2.0
    
    #include <console.h>
    
    #ifndef CONFIG_SYS_COREBOOT
    #error This driver requires coreboot
    #endif
    
    #include <asm/arch/sysinfo.h>
    
    struct cbmem_console {
    	u32 buffer_size;
    	u32 buffer_cursor;
    	u8  buffer_body[0];
    }  __attribute__ ((__packed__));
    
    static struct cbmem_console *cbmem_console_p;
    
    
    void cbmemc_putc(struct stdio_dev *dev, char data)
    
    {
    	int cursor;
    
    	cursor = cbmem_console_p->buffer_cursor++;
    	if (cursor < cbmem_console_p->buffer_size)
    		cbmem_console_p->buffer_body[cursor] = data;
    }
    
    
    void cbmemc_puts(struct stdio_dev *dev, const char *str)
    
    {
    	char c;
    
    	while ((c = *str++) != 0)
    
    		cbmemc_putc(dev, c);
    
    }
    
    int cbmemc_init(void)
    {
    	int rc;
    	struct stdio_dev cons_dev;
    	cbmem_console_p = lib_sysinfo.cbmem_cons;
    
    	memset(&cons_dev, 0, sizeof(cons_dev));
    
    	strcpy(cons_dev.name, "cbmem");
    	cons_dev.flags = DEV_FLAGS_OUTPUT; /* Output only */
    	cons_dev.putc  = cbmemc_putc;
    	cons_dev.puts  = cbmemc_puts;
    
    	rc = stdio_register(&cons_dev);
    
    	return (rc == 0) ? 1 : rc;
    }