Porting PicoTCP WIP

kernel/picotcp/include/arch/pico_dos.h

@@ -0,0 +1,44 @@
+/*
+ * This is a picoTCP arch file for the DOS 16 bit target using OpenWatcom v1.9
+ * Copyright (C) 2015 Mateusz Viste
+ *
+ * This code is donated to the picoTCP project, and shares the same licensing,
+ * that is GNU GPLv2.
+ *
+ * See COPYING, LICENSE.GPLv2 and LICENSE.GPLv3 for usage.
+ */
+
+#include <dos.h>   /* provides int86() along with the union REGS type */
+
+#ifndef PICO_SUPPORT_DOS_WATCOM
+#define PICO_SUPPORT_DOS_WATCOM
+
+#define dbg(...)
+
+#define pico_zalloc(x) calloc(x, 1)
+#define pico_free(x) free(x)
+
+static inline unsigned long PICO_TIME_MS(void)
+{
+    union REGS regs;
+    unsigned long ticks;
+    regs.h.ah = 0;          /* get system time (IBM BIOS call) - INT 1A,0 */
+    int86(0x1A, &regs, &regs);
+    ticks = regs.x.cx;      /* number of ticks since midnight (high word) */
+    ticks <<= 16;
+    ticks |= regs.x.dx;     /* number of ticks since midnight (low word) */
+    return (ticks * 55);    /* a tick is 55ms because the i8253 PIT runs at 18.2 Hz */
+}
+
+static inline unsigned long PICO_TIME(void)
+{
+    return (PICO_TIME_MS() / 1000);
+}
+
+static inline void PICO_IDLE(void)
+{
+    union REGS regs;
+    int86(0x28, &regs, &regs); /* DOS 2+ IDLE INTERRUPT */
+}
+
+#endif /* PICO_SUPPORT_DOS_WATCOM */