add x86 supportHEADmaster

1 files changed, 30 insertions, 0 deletions

diff --git a/kernel/x86/kernel.c b/kernel/x86/kernel.c
new file mode 100644
index 0000000..296d966
--- /dev/null
+++ b/kernel/x86/kernel.c
@@ -0,0 +1,30 @@
+#include <sys/stddef.h>
+#include <early/uart.h>
+#include <sys/log.h>
+
+#define COM1_PORT 0x3F8
+
+void serial_init(void) {
+    outb(COM1_PORT + 1, 0x00);    // Disable interrupts
+    outb(COM1_PORT + 3, 0x80);    // Enable DLAB (set baud rate divisor)
+    outb(COM1_PORT + 0, 0x01);    // Set divisor to 1 (lo byte) -> 115200 baud
+    outb(COM1_PORT + 1, 0x00);    //                  (hi byte)
+    outb(COM1_PORT + 3, 0x03);    // 8 bits, no parity, one stop bit
+    outb(COM1_PORT + 2, 0xC7);    // Enable FIFO, clear them, with 14-byte threshold
+    outb(COM1_PORT + 4, 0x0B);    // IRQs enabled, RTS/DSR set
+}
+
+static int serial_tx_ready(void) {
+    return inb(COM1_PORT + 5) & 0x20;
+}
+
+void serial_putchar(char c) {
+    while (serial_tx_ready() == 0);
+    outb(COM1_PORT, c);
+}
+
+void kernel_main(void) {
+    serial_init();
+    register_console_callback(serial_putchar);
+    printk("wkern version %s (Compiler %s, Linker %s) on %s\n", VERSION, COMPILER_NAME, LINKER_NAME, ARCH_NAME);
+}