DragonOS-Community/DragonOS
4
1
Fork 0
mirror of https://github.com/DragonOS-Community/DragonOS.git synced 2025-06-18 08:06:32 +00:00
Code Issues Releases Wiki Activity

🆕 新增了使用8259A芯片的中断响应程序

Browse Source
This commit is contained in:
fslongjin
2022-01-29 12:52:25 +08:00
parent 49eaf6ce95
commit eff673edcb
8 changed files with 302 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

50
kernel/common/glib.h
View File

@ -18,11 +18,11 @@
//内存屏障
#define io_mfence() __asm__ __volatile__("mfence\n\t" :: \
: "memory") // 在mfence指令前的读写操作当必须在mfence指令后的读写操作前完成。
: "memory") // 在mfence指令前的读写操作必须在mfence指令后的读写操作前完成。
#define io_sfence() __asm__ __volatile__("sfence\n\t" :: \
: "memory") // 在sfence指令前的写操作当必须在sfence指令后的写操作前完成
: "memory") // 在sfence指令前的写操作必须在sfence指令后的写操作前完成
#define io_lfence() __asm__ __volatile__("lfence\n\t" :: \
: "memory") // 在lfence指令前的读操作当必须在lfence指令后的读操作前完成。
: "memory") // 在lfence指令前的读操作必须在lfence指令后的读操作前完成。
// 定义类型的缩写
typedef unsigned long ul;
@ -140,4 +140,48 @@ void *memset_c(void *dst, unsigned char c, ul n)
for (int i = 0; i < n; ++i)
s[i] = c;
return dst;
}
// 从io口读入8个bit
unsigned char io_in8(unsigned short port)
{
unsigned char ret = 0;
__asm__ __volatile__( "inb %%dx, %0 \n\t"
"mfence \n\t"
:"=a"(ret)
:"d"(port)
:"memory");
return ret;
}
// 从io口读入32个bit
unsigned int io_in32(unsigned short port)
{
unsigned int ret = 0;
__asm__ __volatile__( "inl %%dx, %0 \n\t"
"mfence \n\t"
:"=a"(ret)
:"d"(port)
:"memory");
return ret;
}
// 输出8个bit到输出端口
void io_out8(unsigned short port,unsigned char value)
{
__asm__ __volatile__( "outb %0, %%dx \n\t"
"mfence \n\t"
:
:"a"(value),"d"(port)
:"memory");
}
// 输出32个bit到输出端口
void io_out32(unsigned short port,unsigned int value)
{
__asm__ __volatile__( "outl %0, %%dx \n\t"
"mfence \n\t"
:
:"a"(value),"d"(port)
:"memory");
}