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/*
* Copyright (c) 2024, sakumisu
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef USB_MEMCPY_H
#define USB_MEMCPY_H
#include <stdint.h>
#include <stddef.h>
#define ALIGN_UP_DWORD(x) ((uint32_t)(uintptr_t)(x) & (sizeof(uint32_t) - 1))
static inline void dword2array(char *addr, uint32_t w)
{
addr[0] = w;
addr[1] = w >> 8;
addr[2] = w >> 16;
addr[3] = w >> 24;
}
static inline void *usb_memcpy(void *s1, const void *s2, size_t n)
{
char *b1 = (char *)s1;
const char *b2 = (const char *)s2;
uint32_t *w1;
const uint32_t *w2;
if (ALIGN_UP_DWORD(b1) == ALIGN_UP_DWORD(b2)) {
while (ALIGN_UP_DWORD(b1) != 0 && n > 0) {
*b1++ = *b2++;
--n;
}
w1 = (uint32_t *)b1;
w2 = (const uint32_t *)b2;
while (n >= 4 * sizeof(uint32_t)) {
*w1++ = *w2++;
*w1++ = *w2++;
*w1++ = *w2++;
*w1++ = *w2++;
n -= 4 * sizeof(uint32_t);
}
while (n >= sizeof(uint32_t)) {
*w1++ = *w2++;
n -= sizeof(uint32_t);
}
b1 = (char *)w1;
b2 = (const char *)w2;
while (n--) {
*b1++ = *b2++;
}
} else {
while (n > 0 && ALIGN_UP_DWORD(b2) != 0) {
*b1++ = *b2++;
--n;
}
w2 = (const uint32_t *)b2;
while (n >= 4 * sizeof(uint32_t)) {
dword2array(b1, *w2++);
b1 += sizeof(uint32_t);
dword2array(b1, *w2++);
b1 += sizeof(uint32_t);
dword2array(b1, *w2++);
b1 += sizeof(uint32_t);
dword2array(b1, *w2++);
b1 += sizeof(uint32_t);
n -= 4 * sizeof(uint32_t);
}
while (n >= sizeof(uint32_t)) {
dword2array(b1, *w2++);
b1 += sizeof(uint32_t);
n -= sizeof(uint32_t);
}
b2 = (const char *)w2;
while (n--) {
*b1++ = *b2++;
}
}
return s1;
}
#endif
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