rename kernel/arch/log.h to io.h

it's not related to logging but to general io, the old name didn't make
sense

1 files changed, 29 insertions, 0 deletions

diff --git a/src/kernel/arch/io.h b/src/kernel/arch/io.h
new file mode 100644
index 0000000..ef8cb17
--- /dev/null
+++ b/src/kernel/arch/io.h
@@ -0,0 +1,29 @@
+#pragma once
+#include <stddef.h>
+
+void tty_init(void);
+void tty_write(const char *buf, size_t len);
+
+static inline void _tty_hex(const char *buf, size_t len) {
+	char hex[2];
+	for (size_t i = 0; i < len; i++) {
+		hex[0] = (buf[i] & 0xF0) >> 4;
+		hex[0] += '0';
+		if (hex[0] > '9')
+			hex[0] += 'a' - '9' - 1;
+
+		hex[1] = buf[i] & 0xF;
+		hex[1] += '0';
+		if (hex[1] > '9')
+			hex[1] += 'a' - '9' - 1;
+		
+		tty_write(hex, 2);
+	}
+}
+
+// used for static strings
+#define tty_const(str) tty_write(str, sizeof(str) - 1)
+
+// very hacky, shouldn't be actually used - only for debugging
+// prints backwards
+#define _tty_var(var) _tty_hex((void*)&var, sizeof(var))