From 5836c7df10d48b9c3241f2fbdb9ea3a37313a6fd Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Mon, 9 Aug 2021 21:11:16 +0200
Subject: move all the tty stuff to a tty directory

---
 src/kernel/arch/i386/tty/log.c |  6 ++++++
 src/kernel/arch/i386/tty/vga.c | 33 +++++++++++++++++++++++++++++++++
 src/kernel/arch/i386/tty/vga.h |  6 ++++++
 3 files changed, 45 insertions(+)
 create mode 100644 src/kernel/arch/i386/tty/log.c
 create mode 100644 src/kernel/arch/i386/tty/vga.c
 create mode 100644 src/kernel/arch/i386/tty/vga.h

(limited to 'src/kernel/arch/i386/tty')

diff --git a/src/kernel/arch/i386/tty/log.c b/src/kernel/arch/i386/tty/log.c
new file mode 100644
index 0000000..1a2d874
--- /dev/null
+++ b/src/kernel/arch/i386/tty/log.c
@@ -0,0 +1,6 @@
+#include <kernel/arch/i386/tty/vga.h>
+#include <kernel/arch/log.h>
+
+void log_write(const char *buf, size_t len) {
+	tty_write(buf, len);
+}
diff --git a/src/kernel/arch/i386/tty/vga.c b/src/kernel/arch/i386/tty/vga.c
new file mode 100644
index 0000000..db4b47f
--- /dev/null
+++ b/src/kernel/arch/i386/tty/vga.c
@@ -0,0 +1,33 @@
+#include <kernel/arch/i386/tty/vga.h>
+
+struct vga_cell {
+	unsigned char c;
+	unsigned char style;
+} __attribute__((__packed__));
+
+static const size_t     vga_len = 80 * 25;
+static struct vga_cell *vga     = (void*) 0xB8000;
+static size_t           vga_pos = 0;
+
+static void tty_scroll() {
+	for (size_t i = 0; i < vga_len - 80; i++)
+		vga[i] = vga[i + 80];
+	vga_pos -= 80;
+}
+
+void tty_putchar(char c) {
+	if (vga_pos >= vga_len - 80)
+		tty_scroll();
+	vga[vga_pos++].c = c;
+}
+
+void tty_write(const char *buf, size_t len) {
+	for (size_t i = 0; i < len; i++)
+		tty_putchar(buf[i]);
+}
+
+void tty_clear() {
+	for (size_t i = 0; i < vga_len; i++)
+		vga[i].c = ' ';
+	vga_pos = 0;
+}
diff --git a/src/kernel/arch/i386/tty/vga.h b/src/kernel/arch/i386/tty/vga.h
new file mode 100644
index 0000000..cbb8efc
--- /dev/null
+++ b/src/kernel/arch/i386/tty/vga.h
@@ -0,0 +1,6 @@
+#pragma once
+#include <stddef.h>
+
+void tty_putchar(char c);
+void tty_write(const char *buf, size_t len);
+void tty_clear();
-- 
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