mirror of https://gitee.com/openkylin/linux.git
80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
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/*
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* arch/h8300/kernel/early_printk.c
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*
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* Copyright (C) 2009 Yoshinori Sato <ysato@users.sourceforge.jp>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/console.h>
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#include <linux/tty.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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static void sim_write(struct console *co, const char *ptr,
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unsigned len)
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{
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register const int fd __asm__("er0") = 1; /* stdout */
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register const char *_ptr __asm__("er1") = ptr;
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register const unsigned _len __asm__("er2") = len;
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__asm__(".byte 0x5e,0x00,0x00,0xc7\n\t" /* jsr @0xc7 (sys_write) */
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: : "g"(fd), "g"(_ptr), "g"(_len));
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}
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static struct console sim_console = {
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.name = "sim_console",
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.write = sim_write,
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.setup = NULL,
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.flags = CON_PRINTBUFFER,
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.index = -1,
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};
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static char sim_console_buf[32];
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static int sim_probe(struct platform_device *pdev)
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{
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if (sim_console.data)
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return -EEXIST;
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if (!strstr(sim_console_buf, "keep"))
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sim_console.flags |= CON_BOOT;
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register_console(&sim_console);
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return 0;
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}
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static int sim_remove(struct platform_device *pdev)
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{
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return 0;
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}
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static struct platform_driver sim_driver = {
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.probe = sim_probe,
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.remove = sim_remove,
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.driver = {
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.name = "h8300-sim",
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.owner = THIS_MODULE,
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},
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};
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early_platform_init_buffer("earlyprintk", &sim_driver,
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sim_console_buf, ARRAY_SIZE(sim_console_buf));
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static struct platform_device sim_console_device = {
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.name = "h8300-sim",
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.id = 0,
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};
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static struct platform_device *devices[] __initdata = {
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&sim_console_device,
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};
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void __init sim_console_register(void)
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{
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early_platform_add_devices(devices,
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ARRAY_SIZE(devices));
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}
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