drawing lines to fb

1 files changed, 21 insertions, 0 deletions

diff --git a/kernel/debug.c b/kernel/debug.c
new file mode 100644
index 0000000..3ce4866
--- /dev/null
+++ b/kernel/debug.c
@@ -0,0 +1,21 @@
+#include <stdint.h>
+
+void bochs_breakpoint(void)
+{
+	__asm__ volatile ("xchgw %bx, %bx;");
+}
+
+void put_in_r8(uint64_t value)
+{
+	__asm__ volatile ("movq %0, %%r8;" : : "r"(value) : "%r8");
+}
+
+void put_in_r9(uint64_t value)
+{
+	__asm__ volatile ("movq %0, %%r9;" : : "r"(value) : "%r9");
+}
+
+void put_in_r10(uint64_t value)
+{
+	__asm__ volatile ("movq %0, %%r10;" : : "r"(value) : "%r10");
+}