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Add IO helper methods

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This commit is contained in:
Braiden Vasco 2017-11-02 11:57:17 +00:00
parent 28cca159e5
commit 49a3b5b8f9
1 changed files with 48 additions and 0 deletions
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arch/io.h Normal file
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#ifndef KERNELMQ_INCLUDED_IO
#define KERNELMQ_INCLUDED_IO 1
inline static unsigned char inb(unsigned short port);
inline static unsigned short inw(unsigned short port);
inline static unsigned int ind(unsigned short port);
inline static void outb(unsigned short port, unsigned char value);
inline static void outw(unsigned short port, unsigned short value);
inline static void outd(unsigned short port, unsigned int value);
unsigned char inb(unsigned short port)
{
register unsigned char result;
asm volatile("inb %1, %0" : "=a" (result) : "dN" (port));
return result;
}
unsigned short inw(unsigned short port)
{
register unsigned short result;
asm volatile("inw %1, %0" : "=a" (result) : "dN" (port));
return result;
}
unsigned int ind(unsigned short port)
{
register unsigned int result;
asm volatile("ind %1, %0" : "=a" (result) : "dN" (port));
return result;
}
void outb(unsigned short port, unsigned char value)
{
asm volatile("outb %1, %0" : : "dN" (port), "a" (value));
}
void outw(unsigned short port, unsigned short value)
{
asm volatile("outw %1, %0" : : "dN" (port), "a" (value));
}
void outd(unsigned short port, unsigned int value)
{
asm volatile("outd %1, %0" : : "dN" (port), "a" (value));
}
#endif