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-rw-r--r--build.zig6
-rw-r--r--kernel/drivers/drivers.c4
-rw-r--r--kernel/drivers/pci.c2
-rw-r--r--kernel/drivers/tty.c105
-rw-r--r--kernel/drivers/uart.c43
-rw-r--r--kernel/include/comus/drivers/tty.h27
-rw-r--r--kernel/include/comus/drivers/uart.h19
-rw-r--r--kernel/io/io.c19
-rw-r--r--kernel/lib/fputc.c11
-rw-r--r--kernel/lib/panic.c (renamed from kernel/io/panic.c)0
10 files changed, 215 insertions, 21 deletions
diff --git a/build.zig b/build.zig
index 42147ee..e673d1d 100644
--- a/build.zig
+++ b/build.zig
@@ -32,8 +32,10 @@ const kernel_src = &[_][]const u8{
"kernel/cpu/pic.c",
"kernel/drivers/drivers.c",
"kernel/drivers/pci.c",
- "kernel/io/io.c",
- "kernel/io/panic.c",
+ "kernel/drivers/tty.c",
+ "kernel/drivers/uart.c",
+ "kernel/lib/fputc.c",
+ "kernel/lib/panic.c",
"kernel/mboot/mboot.c",
"kernel/mboot/mmap.c",
"kernel/memory/memory.c",
diff --git a/kernel/drivers/drivers.c b/kernel/drivers/drivers.c
index 5b68248..4790c3a 100644
--- a/kernel/drivers/drivers.c
+++ b/kernel/drivers/drivers.c
@@ -1,7 +1,11 @@
#include <comus/drivers.h>
+#include <comus/drivers/uart.h>
+#include <comus/drivers/tty.h>
#include <comus/drivers/pci.h>
void drivers_init(void)
{
+ uart_init();
+ tty_init();
pci_init();
}
diff --git a/kernel/drivers/pci.c b/kernel/drivers/pci.c
index 83c47f1..5f17b3b 100644
--- a/kernel/drivers/pci.c
+++ b/kernel/drivers/pci.c
@@ -137,6 +137,8 @@ void pci_init(void)
printf("PCI DEVICES\n");
for (size_t i = 0; i < pci_table_next; i++) {
print_device(&pci_table[i]);
+ print_device(&pci_table[i]);
+ print_device(&pci_table[i]);
}
printf("\n");
}
diff --git a/kernel/drivers/tty.c b/kernel/drivers/tty.c
new file mode 100644
index 0000000..74715a2
--- /dev/null
+++ b/kernel/drivers/tty.c
@@ -0,0 +1,105 @@
+#include <lib.h>
+#include <comus/drivers/tty.h>
+#include <comus/asm.h>
+#include <comus/memory.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#define VGA_ADDR 0xB8000
+
+static const uint8_t width = 80;
+static const uint8_t height = 25;
+static volatile uint16_t *buffer = NULL;
+
+// position
+static uint32_t x, y;
+
+// color
+static uint8_t fg, bg;
+
+// blank color
+const uint16_t blank = (uint16_t) 0 | 0 << 12 | 15 << 8;
+
+static void term_clear_line(int line) {
+ if (line < 0 || line >= height)
+ return;
+ for (uint8_t x = 0; x < width; x++) {
+ const size_t index = line * width + x;
+ buffer[index] = blank;
+ }
+}
+
+static void term_clear(void) {
+ for (uint8_t y = 0; y < height; y++)
+ term_clear_line(y);
+}
+
+static void term_scroll(int lines) {
+ cli();
+ y -= lines;
+ if (!lines) return;
+ if (lines >= height || lines <= -height) {
+ term_clear();
+ } else if (lines > 0) {
+ memmovev(buffer, buffer + lines * width, 2 * (height - lines) * width);
+ term_clear_line(height - lines);
+ } else {
+ memmovev(buffer + lines * width, buffer + lines, (height + lines) * width);
+ }
+ sti();
+}
+
+void tty_init(void)
+{
+ buffer = mapaddr((void*)VGA_ADDR, width * height * sizeof(uint16_t));
+ x = 0;
+ y = 0;
+ fg = 15;
+ bg = 0;
+}
+
+void tty_out(char c)
+{
+ if (buffer == NULL)
+ return;
+
+ // handle special chars
+ switch (c) {
+ case '\n':
+ x = 0;
+ y++;
+ break;
+ case '\t':
+ x += 4;
+ break;
+ case '\v':
+ case '\f':
+ y++;
+ break;
+ case '\r':
+ x = 0;
+ break;
+ default: {
+ const size_t index = y * width + x;
+ buffer[index] = c | bg << 12 | fg << 8;
+ x++;
+ }
+ }
+
+ // wrap cursor if needed
+ if (x >= width) {
+ x = 0;
+ y++;
+ }
+ if (y >= height) {
+ term_scroll(y - (height - 1));
+ y = height - 1;
+ }
+
+ // set cursor position on screen
+ const uint16_t pos = y * width + x;
+ outb(0x3D4, 0x0F);
+ outb(0x3D5, (uint8_t) (pos & 0xFF));
+ outb(0x3D4, 0x0E);
+ outb(0x3D5, (uint8_t) ((pos >> 8) & 0xFF));
+}
diff --git a/kernel/drivers/uart.c b/kernel/drivers/uart.c
new file mode 100644
index 0000000..c999e45
--- /dev/null
+++ b/kernel/drivers/uart.c
@@ -0,0 +1,43 @@
+#include <comus/drivers/uart.h>
+#include <comus/asm.h>
+
+#define PORT 0x3F8
+
+int uart_init(void) {
+ outb(PORT + 1, 0x00); // disable interrupts
+ outb(PORT + 3, 0x80); // enable DLAB (divisor latch access bit)
+ outb(PORT + 0, 0x03); // (lo) Set baud divisor to 3 38400 baud
+ outb(PORT + 1, 0x00); // (hi)
+ outb(PORT + 3, 0x03); // disable DLAB, set 8 bits per word, one stop bit, no parity
+ outb(PORT + 2, 0xC7); // enable and clear FIFOs, set to maximum threshold
+ outb(PORT + 4, 0x0B); // ???
+ outb(PORT + 4, 0x1E); // set in loopback mode for test
+ outb(PORT + 0, 0xAE); // test by sending 0xAE
+
+ uint8_t response = inb(PORT + 0);
+ if (response != 0xAE) {
+ // TODO: panic here?
+ return -1;
+ }
+
+ // disable loopback, enable IRQs
+ outb(PORT + 4, 0x0F);
+ return 0;
+}
+
+uint8_t uart_in(void) {
+ // wait for data to be available
+ while ((inb(PORT + 5) & 0x01) == 0);
+ return inb(PORT);
+}
+
+void uart_out(uint8_t ch) {
+ // wait for output to be free
+ while ((inb(PORT + 5) & 0x20) == 0);
+ outb(PORT, ch);
+}
+
+void uart_out_str(const char *str) {
+ while (*str)
+ uart_out(*str++);
+}
diff --git a/kernel/include/comus/drivers/tty.h b/kernel/include/comus/drivers/tty.h
new file mode 100644
index 0000000..c951c3e
--- /dev/null
+++ b/kernel/include/comus/drivers/tty.h
@@ -0,0 +1,27 @@
+/**
+ * @file tty.h
+ *
+ * @author Freya Murphy <freya@freyacat.org>
+ *
+ * Terminal output
+ */
+
+#ifndef TTY_H_
+#define TTY_H_
+
+/**
+ * Initalize the terminal
+ */
+void tty_init(void);
+
+/**
+ * Output a character to the terminal
+ */
+void tty_out(char c);
+
+/**
+ * Output a string to the terminal
+ */
+void tty_out_str(char *str);
+
+#endif /* tty.h */
diff --git a/kernel/include/comus/drivers/uart.h b/kernel/include/comus/drivers/uart.h
new file mode 100644
index 0000000..9a2d70a
--- /dev/null
+++ b/kernel/include/comus/drivers/uart.h
@@ -0,0 +1,19 @@
+/**
+ * @file uart.h
+ *
+ * @author Freya Murphy <freya@freyacat.org>
+ *
+ * Serial interface
+ */
+
+#ifndef UART_H_
+#define UART_H_
+
+#include <stdint.h>
+
+int uart_init(void);
+uint8_t uart_in(void);
+void uart_out(uint8_t ch);
+void uart_out_str(const char *str);
+
+#endif /* uart.h */
diff --git a/kernel/io/io.c b/kernel/io/io.c
deleted file mode 100644
index 489148d..0000000
--- a/kernel/io/io.c
+++ /dev/null
@@ -1,19 +0,0 @@
-#include <lib.h>
-#include <stdio.h>
-#include <comus/asm.h>
-
-#define PORT 0x3F8
-static void serial_out(uint8_t ch)
-{
- // wait for output to be free
- while ((inb(PORT + 5) & 0x20) == 0)
- ;
- outb(PORT, ch);
-}
-
-void fputc(FILE *stream, char c)
-{
- (void)stream;
-
- serial_out(c);
-}
diff --git a/kernel/lib/fputc.c b/kernel/lib/fputc.c
new file mode 100644
index 0000000..ef9b6f6
--- /dev/null
+++ b/kernel/lib/fputc.c
@@ -0,0 +1,11 @@
+#include <lib.h>
+#include <comus/drivers/tty.h>
+#include <comus/drivers/uart.h>
+
+void fputc(FILE *stream, char c)
+{
+ (void)stream; // TODO: manage stream
+ uart_out(c);
+ tty_out(c);
+}
+
diff --git a/kernel/io/panic.c b/kernel/lib/panic.c
index 403418f..403418f 100644
--- a/kernel/io/panic.c
+++ b/kernel/lib/panic.c
generated by cgit v1.2.3-freya (git 2.51.0) at 2025-09-22 17:30:12 +0000