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[RFC,11/47] lkl: basic kernel console support

Message ID 25feebc8e8e21081aec66a14114bb4ad1312118e.1571798507.git.thehajime@gmail.com
State Superseded
Headers show
Series [RFC,01/47] asm-generic: atomic64: allow using generic atomic64 on 64bit platforms | expand

Commit Message

Hajime Tazaki Oct. 23, 2019, 4:37 a.m. UTC 
From: Octavian Purdila <tavi.purdila@gmail.com>

Write operations are deferred to the host print operation.

Signed-off-by: Octavian Purdila <tavi.purdila@gmail.com>
---
 arch/um/lkl/kernel/console.c | 42 ++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 arch/um/lkl/kernel/console.c
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Patch

diff --git a/arch/um/lkl/kernel/console.c b/arch/um/lkl/kernel/console.c
new file mode 100644
index 000000000000..54d7f756c6da
--- /dev/null
+++ b/arch/um/lkl/kernel/console.c
@@ -0,0 +1,42 @@ 
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <asm/host_ops.h>
+
+static void console_write(struct console *con, const char *str,
+			  unsigned int len)
+{
+	if (lkl_ops->print)
+		lkl_ops->print(str, len);
+}
+
+#ifdef CONFIG_LKL_EARLY_CONSOLE
+static struct console lkl_boot_console = {
+	.name	= "lkl_boot_console",
+	.write	= console_write,
+	.flags	= CON_PRINTBUFFER | CON_BOOT,
+	.index	= -1,
+};
+
+int __init lkl_boot_console_init(void)
+{
+	register_console(&lkl_boot_console);
+	return 0;
+}
+early_initcall(lkl_boot_console_init);
+#endif
+
+static struct console lkl_console = {
+	.name	= "lkl_console",
+	.write	= console_write,
+	.flags	= CON_PRINTBUFFER,
+	.index	= -1,
+};
+
+static int __init lkl_console_init(void)
+{
+	register_console(&lkl_console);
+	return 0;
+}
+core_initcall(lkl_console_init);