5858

Move script to create a Soso boot image into a sub-directory.

I'm trying to streamline newcomer attention to just a couple of use cases.

1 files changed, 25 insertions, 0 deletions

diff --git a/tools/iso/kernel.soso/spinlock.c b/tools/iso/kernel.soso/spinlock.c
new file mode 100644
index 00000000..8efbdb20
--- /dev/null
+++ b/tools/iso/kernel.soso/spinlock.c
@@ -0,0 +1,25 @@
+#include "spinlock.h"
+
+static inline int32 exchangeAtomic(volatile int32* oldValueAddress, int32 newValue) {
+    //no need to use lock instruction on xchg
+
+    asm volatile ("xchgl %0, %1"
+                   : "=r"(newValue)
+                   : "m"(*oldValueAddress), "0"(newValue)
+                   : "memory");
+    return newValue;
+}
+
+void Spinlock_Init(Spinlock* spinlock) {
+    *spinlock = 0;
+}
+
+void Spinlock_Lock(Spinlock* spinlock) {
+    while (exchangeAtomic((int32*)spinlock, 1)) {
+        halt();
+    }
+}
+
+void Spinlock_Unlock(Spinlock* spinlock) {
+    *spinlock = 0;
+}