First commit

1 files changed, 41 insertions, 0 deletions

diff --git a/src/stem/sys.c b/src/stem/sys.c
new file mode 100644
index 0000000..71d1c31
--- /dev/null
+++ b/src/stem/sys.c
@@ -0,0 +1,41 @@
+#include "sys.h"
+#include "monitor.h"
+
+void outb(uint16_t port, uint8_t value) {
+	asm volatile("outb %1, %0" : : "dN"(port), "a"(value));
+}
+
+void outw(uint16_t port, uint16_t value) {
+	asm volatile("outw %1, %0" : : "dN"(port), "a"(value));
+}
+
+uint8_t inb(uint16_t port) {
+	uint8_t ret;
+	asm volatile("inb %1, %0" : "=a"(ret) : "dN"(port));
+	return ret;
+}
+
+uint16_t inw(uint16_t port) {
+	uint16_t ret;
+	asm volatile("inw %1, %0" : "=a"(ret) : "dN"(port));
+	return ret;
+}
+
+void panic(char* message, char* file, int line) {
+	monitor_write(">> PANIC: >>");
+	monitor_write(message); monitor_write("<< in file "); monitor_write(file);
+	monitor_write("\nSystem halted T_T");
+	asm volatile("cli; hlt");
+}
+
+static uint32_t if_locks = 1;
+
+void cli() {
+	asm volatile("cli");
+	if_locks++;
+}
+
+void sti() {
+	if_locks--;
+	if (if_locks == 0) asm volatile("sti");
+}