mirror of
https://github.com/DragonOS-Community/DragonOS.git
synced 2025-06-09 19:36:47 +00:00
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
#include "glib.h"
|
||
#include "string.h"
|
||
|
||
/**
|
||
* @brief 这个函数让蜂鸣器发声，目前仅用于真机调试。未来将移除，请勿依赖此函数。
|
||
*
|
||
* @param times 发声循环多少遍
|
||
*/
|
||
void __experimental_beep(uint64_t times)
|
||
{
|
||
io_out8(0x43, 182&0xff);
|
||
io_out8(0x42, 2280&0xff);
|
||
io_out8(0x42, (2280>>8)&0xff);
|
||
uint32_t x = io_in8(0x61)&0xff;
|
||
x |= 3;
|
||
io_out8(0x61, x&0xff);
|
||
|
||
times *= 10000;
|
||
for(uint64_t i=0;i<times;++i)
|
||
pause();
|
||
x = io_in8(0x61);
|
||
x &= 0xfc;
|
||
io_out8(0x61, x&0xff);
|
||
|
||
// 延迟一段时间
|
||
for(uint64_t i=0;i<times;++i)
|
||
pause();
|
||
}
|
||
|
||
/**
|
||
* @brief 将数据从src搬运到dst，并能正确处理地址重叠的问题
|
||
*
|
||
* @param dst 目标地址指针
|
||
* @param src 源地址指针
|
||
* @param size 大小
|
||
* @return void* 指向目标地址的指针
|
||
*/
|
||
void *memmove(void *dst, const void *src, uint64_t size)
|
||
{
|
||
const char *_src = src;
|
||
char *_dst = dst;
|
||
|
||
if (!size)
|
||
return dst;
|
||
|
||
// 当源地址大于目标地址时，使用memcpy来完成
|
||
if (dst <= src)
|
||
return memcpy(dst, src, size);
|
||
|
||
// 当源地址小于目标地址时，为防止重叠覆盖，因此从后往前拷贝
|
||
_src += size;
|
||
_dst += size;
|
||
|
||
// 逐字节拷贝
|
||
while (size--)
|
||
*--_dst = *--_src;
|
||
|
||
return dst;
|
||
} |