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| author | Palmer Dabbelt <palmer@sifive.com> | 2017-12-08 15:10:35 -0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@sifive.com> | 2018-08-13 08:31:30 -0700 |
| commit | 5b5c2a2c44d7225ab3abbcc7e1881b97ea9872dd (patch) | |
| tree | ea7f911326a319e74058cfb5b30ad3f5b2d90fee /arch/riscv | |
| parent | 758914fea278658943e3a56e4d373ae8c6f0d9e5 (diff) | |
| download | linux-5b5c2a2c44d7225ab3abbcc7e1881b97ea9872dd.tar.gz | |
RISC-V: Add early printk support via the SBI console
This code lives entirely within the RISC-V arch code. I've left it within an "#ifdef CONFIG_EARLY_PRINTK" despite always having EARLY_PRINTK support on RISC-V just in case someone wants to remove it. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
Diffstat (limited to 'arch/riscv')
| -rw-r--r-- | arch/riscv/kernel/setup.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c index f0d2070866d4..db20dc630e7e 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -39,6 +39,27 @@ #include <asm/tlbflush.h> #include <asm/thread_info.h> +#ifdef CONFIG_EARLY_PRINTK +static void sbi_console_write(struct console *co, const char *buf, + unsigned int n) +{ + int i; + + for (i = 0; i < n; ++i) { + if (buf[i] == '\n') + sbi_console_putchar('\r'); + sbi_console_putchar(buf[i]); + } +} + +struct console riscv_sbi_early_console_dev __initdata = { + .name = "early", + .write = sbi_console_write, + .flags = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME, + .index = -1 +}; +#endif + #ifdef CONFIG_DUMMY_CONSOLE struct screen_info screen_info = { .orig_video_lines = 30, @@ -195,6 +216,12 @@ static void __init setup_bootmem(void) void __init setup_arch(char **cmdline_p) { +#if defined(CONFIG_EARLY_PRINTK) + if (likely(early_console == NULL)) { + early_console = &riscv_sbi_early_console_dev; + register_console(early_console); + } +#endif *cmdline_p = boot_command_line; parse_early_param(); |