f6ef1f833c
Thoroughly clean up the code to vastly reduce the number of compiler warnings and found and fixed several bugs in the process; Applied all mainline PCem commits; Added SCSI hard disk emulation; Commented out all unfinished machines and graphics cards; Added the AOpen AP53 and ASUS P/I-P55T2 machines as well as another Tyan 440FX machine, all three with AMI WinBIOS (patch from TheCollector1995); Added the Diamond Stealth 3D 3000 (S3 ViRGE/VX) graphics card (patch from TheCollector1995); Added the PS/2 XT IDE (AccuLogic) HDD Controller (patch from TheCollector1995); Added Microsoft/Logitech Bus Mouse emulation (patch from waltje); Overhauled the makefiles (patch from waltje); Added the Adaptec AHA-1542CF SCSI controller (patch from waltje); Added preliminary (but still unfinished) Adaptec AHA-154x SCSI controller BIOS support (patch from waltje); Added an ISABugger debugging device (patch from waltje); Added sanity checks to the Direct3D code.
75 lines
1.3 KiB
C
75 lines
1.3 KiB
C
/* Better random number generator by Battler. */
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#include <assert.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include "disc_random.h"
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uint32_t preconst = 0x6ED9EBA1;
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static __inline__ uint32_t rotl32c (uint32_t x, uint32_t n)
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{
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assert (n<32);
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return (x<<n) | (x>>(-n&31));
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}
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static __inline__ uint32_t rotr32c (uint32_t x, uint32_t n)
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{
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assert (n<32);
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return (x>>n) | (x<<(-n&31));
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}
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#define ROTATE_LEFT rotl32c
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#define ROTATE_RIGHT rotr32c
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static __inline__ unsigned long long rdtsc(void)
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{
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unsigned hi, lo;
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#ifdef __MSC__
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__asm {
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rdtsc
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mov hi, edx ; EDX:EAX is already standard return!!
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mov lo, eax
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}
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#else
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__asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
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#endif
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return ( (unsigned long long)lo)|( ((unsigned long long)hi)<<32 );
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}
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static uint32_t RDTSC(void)
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{
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return (uint32_t) (rdtsc());
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}
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static void disc_random_twist(uint32_t *val)
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{
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*val = ROTATE_LEFT(*val, rand() % 32);
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*val ^= 0x5A827999;
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*val = ROTATE_RIGHT(*val, rand() % 32);
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*val ^= 0x4ED32706;
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}
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uint8_t disc_random_generate()
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{
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uint16_t r = 0;
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r = (rand() ^ ROTATE_LEFT(preconst, rand() % 32)) % 256;
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disc_random_twist(&preconst);
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return (r & 0xff);
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}
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void disc_random_init()
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{
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uint32_t seed = RDTSC();
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srand(seed);
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return;
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}
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