1 files changed, 43 insertions, 0 deletions
diff --git a/src/kernel/include/dev/v86.h b/src/kernel/include/dev/v86.h
new file mode 100644
index 0000000..b260fa7
--- /dev/null
+++ b/src/kernel/include/dev/v86.h
@@ -0,0 +1,43 @@
+#pragma once
+
+// This is in no way a complete 16-bit PC virtualizer, only a way
+// to call BIOS functions.
+// It is very ugly: it uses a global mutex and a lot of global variables.
+
+#include <thread.h>
+#include <mutex.h>
+
+#define V86_ALLOC_ADDR 0x20000
+#define V86_STACK_TOP 0x80000
+#define V86_BIOS_BEGIN 0xA0000
+#define V86_BIOS_END 0x100000
+
+typedef uint32_t v86_farptr_t;
+
+#define V86_SEG_OF_LIN(x)  ((size_t)(x) >> 4)
+#define V86_OFF_OF_LIN(x)  ((size_t)(x) & 0x0F)
+#define V86_LIN_OF_SEG_OFF(seg, off)   ((((size_t)(seg)) << 4) + ((size_t)(off)))
+inline void* v86_lin_of_fp(v86_farptr_t x) {
+	return (void*)V86_LIN_OF_SEG_OFF(x>>16, x & 0xFFFF);
+}
+inline v86_farptr_t v86_fp_of_lin(void* p) {
+	return (V86_SEG_OF_LIN(p) << 16) | V86_OFF_OF_LIN(p);
+}
+
+typedef struct {
+	uint16_t ax, bx, cx, dx, di, si;
+	uint16_t cs, ds, es, fs, gs, ss;
+	uint16_t ip, sp;
+} v86_regs_t;
+extern v86_regs_t v86_regs;
+
+bool v86_begin_session();
+
+void* v86_alloc(size_t size);
+
+bool v86_bios_int(uint8_t int_no);
+
+void v86_end_session();
+
+
+/* vim: set ts=4 sw=4 tw=0 noet :*/