Configured atomic swap

2 files changed, 24 insertions, 2 deletions

diff --git a/src/cpu/atomic/swap.a.h b/src/cpu/atomic/swap.a.h
index 63dd50b..1ca2a52 100644
--- a/src/cpu/atomic/swap.a.h
+++ b/src/cpu/atomic/swap.a.h
@@ -1,7 +1,12 @@
+#include "../../util/mutex.h"
+
 #ifndef CPU_ATOMIC_SWAP_A_H
 #define CPU_ATOMIC_SWAP_A_H
 
 /// https://stackoverflow.com/questions/16329123/use-of-strexeq-instead-of-strex-for-spinlock-implementation-in-arm
+/// https://elixir.bootlin.com/linux/v4.9/source/arch/arm/include/asm/spinlock.h
+/// https://elixir.bootlin.com/linux/v4.9/source/arch/arm/include/asm/spinlock_types.h#L23
+/// https://www.cs.uic.edu/~jbell/CourseNotes/OperatingSystems/3_Processes.html
 
 static inline void atm_lock(unsigned long pid, unsigned long* addr) {
 	unsigned long tmp, current_lock_value;
@@ -18,8 +23,8 @@ static inline void atm_lock(unsigned long pid, unsigned long* addr) {
 	: "cc");
 }
 
-static inline void atm_unlock(unsigned long* addr) {
-	unsigned long cleared = 0;
+static inline void atm_release(unsigned long* addr) {
+	unsigned long cleared = NULL_PID;
 	asm volatile(
 "	dmb\n"
 "	str %0, [%1]\n"
diff --git a/src/cpu/irq.c b/src/cpu/irq.c
index 0a1e080..adba7a7 100644
--- a/src/cpu/irq.c
+++ b/src/cpu/irq.c
@@ -3,6 +3,7 @@
 #include "../sys/timer.h"
 #include "../drivers/uart.a.h"
 #include "../drivers/uart.h"
+#include "../util/mutex.h"
 #include "../util/time.h"
 
 extern unsigned long cmdidx;
@@ -42,12 +43,14 @@ void c_irq_handler(void) {
 				} else {
 					unsigned long off = cmdidx;
 					if (off < 2048) {
+						// Newline Case
 						if (data == 0x0D) {
 							off = 0;
 							cmd[0] = 0x0;
 							//uart_char(0x0a);
 							uart_char(data);
 							uart_string("\033[?25l> \033[0K\033[?25h");
+						// Backspace Case
 						} else if (data == 0x08 || data == 0x7F) {
 							if (off > 0) {
 								off -= 1;
@@ -56,6 +59,19 @@ void c_irq_handler(void) {
 							uart_char((unsigned char)data);
 							uart_char(0x20);
 							uart_char((unsigned char)data);
+						// Lock Case
+						} else if (data == 0x6C) {
+							uart_char((unsigned char)data);
+							cmd[off] = (char) data;
+							off += 1;
+							lock_mutex(&exe_cnt_m, SCHED_PID);
+						// Release Case
+						} else if (data == 0x72) {
+							uart_char((unsigned char)data);
+							cmd[off] = (char) data;
+							off += 1;
+							release_mutex(&exe_cnt_m, SCHED_PID);
+						// Else output
 						} else {
 							uart_char((unsigned char)data);
 							cmd[off] = (char) data;
@@ -95,6 +111,7 @@ void c_irq_handler(void) {
 		c_timer();
 		//enable_irq();
 		enableirq();
+		return;
 	}
 	return;
 }