Another major cleanup - folders for cdrom and floppy, renamed disc to floppy, renamed SuperIO stuff, others as needed.

src/random.c

@@ -0,0 +1,92 @@
+/*
+ * 86Box	A hypervisor and IBM PC system emulator that specializes in
+ *		running old operating systems and software designed for IBM
+ *		PC systems and compatibles from 1981 through fairly recent
+ *		system designs based on the PCI bus.
+ *
+ *		This file is part of the 86Box distribution.
+ *
+ *		A better random number generation, used for floppy weak bits
+ *		and network MAC address generation.
+ *
+ * Version:	@(#)random.c	1.0.2	2017/09/03
+ *
+ * Author:	Miran Grca, <mgrca8@gmail.com>
+ *		Copyright 2016,2017 Miran Grca.
+ */
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include "random.h"
+
+
+uint32_t preconst = 0x6ED9EBA1;
+
+
+static __inline__ uint32_t rotl32c (uint32_t x, uint32_t n)
+{
+#if 0
+  assert (n<32);
+#endif
+  return (x<<n) | (x>>(-n&31));
+}
+
+static __inline__ uint32_t rotr32c (uint32_t x, uint32_t n)
+{
+#if 0
+  assert (n<32);
+#endif
+  return (x>>n) | (x<<(-n&31));
+}
+
+#define ROTATE_LEFT rotl32c
+
+#define ROTATE_RIGHT rotr32c
+
+static __inline__ unsigned long long rdtsc(void)
+{
+    unsigned hi, lo;
+#ifdef __MSC__
+    __asm {
+		rdtsc
+		mov hi, edx	; EDX:EAX is already standard return!!
+		mov lo, eax
+    }
+#else
+      __asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
+#endif
+    return ( (unsigned long long)lo)|( ((unsigned long long)hi)<<32 );
+}
+
+static uint32_t RDTSC(void)
+{
+	return (uint32_t) (rdtsc());
+}
+
+
+static void random_twist(uint32_t *val)
+{
+	*val = ROTATE_LEFT(*val, rand() % 32);
+	*val ^= 0x5A827999;
+	*val = ROTATE_RIGHT(*val, rand() % 32);
+	*val ^= 0x4ED32706;
+}
+
+
+uint8_t random_generate(void)
+{
+	uint16_t r = 0;
+	r = (rand() ^ ROTATE_LEFT(preconst, rand() % 32)) % 256;
+	random_twist(&preconst);
+	return (r & 0xff);
+}
+
+
+void random_init(void)
+{
+	uint32_t seed = RDTSC();
+	srand(seed);
+	return;
+}