pcsx2/plugins/USBqemu/qemu-usb/vl.cpp

#include <stdio.h>
#include <memory.h>
#include <malloc.h>
#include "vl.h"

void cpu_physical_memory_rw(uint32_t addr, uint8_t *buf,
                            int len, int is_write);

/* compute with 96 bit intermediate result: (a*b)/c */
uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
{
    union {
        uint64_t ll;
        struct {
#ifdef WORDS_BIGENDIAN
            uint32_t high, low;
#else
            uint32_t low, high;
#endif            
        } l;
    } u, res;
    uint64_t rl, rh;

    u.ll = a;
    rl = (uint64_t)u.l.low * (uint64_t)b;
    rh = (uint64_t)u.l.high * (uint64_t)b;
    rh += (rl >> 32);
    res.l.high = static_cast<uint32_t>(rh / c);
    res.l.low = (((rh % c) << 32) + (rl & 0xffffffff)) / c;
    return res.ll;
}