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libkernaux
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Add port I/O functions

This commit is contained in:
Alex Kotov 2020-11-29 04:45:50 +05:00
parent 5d2f20f6b3
commit 372a26612f
Signed by: kotovalexarian
GPG Key ID: 553C0EBBEB5D5F08
1 changed files with 55 additions and 0 deletions
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55
include/kernaux/arch/i386.h
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@ -5,6 +5,19 @@
extern "C" {
#endif
inline static unsigned char kernaux_arch_i386_inportb(unsigned short port);
inline static unsigned short kernaux_arch_i386_inportw(unsigned short port);
inline static unsigned int kernaux_arch_i386_inportd(unsigned short port);
inline static void
kernaux_arch_i386_outportb(unsigned short port, unsigned char value);
inline static void
kernaux_arch_i386_outportw(unsigned short port, unsigned short value);
inline static void
kernaux_arch_i386_outportd(unsigned short port, unsigned int value);
void kernaux_arch_i386_hang() __attribute__((noreturn));
unsigned long kernaux_arch_i386_read_cr0();
@ -14,6 +27,48 @@ void kernaux_arch_i386_write_cr0(volatile unsigned long value);
void kernaux_arch_i386_write_cr3(volatile unsigned long value);
void kernaux_arch_i386_write_cr4(volatile unsigned long value);
unsigned char kernaux_arch_i386_inportb(const unsigned short port)
{
register unsigned char result;
asm volatile("inb %1, %0" : "=a" (result) : "dN" (port));
return result;
}
unsigned short kernaux_arch_i386_inportw(const unsigned short port)
{
register unsigned short result;
asm volatile("inw %1, %0" : "=a" (result) : "dN" (port));
return result;
}
unsigned int kernaux_arch_i386_inportd(const unsigned short port)
{
register unsigned int result;
asm volatile("ind %1, %0" : "=a" (result) : "dN" (port));
return result;
}
void kernaux_arch_i386_outportb(
const unsigned short port,
const unsigned char value
) {
asm volatile("outb %1, %0" : : "dN" (port), "a" (value));
}
void kernaux_arch_i386_outportw(
const unsigned short port,
const unsigned short value
) {
asm volatile("outw %1, %0" : : "dN" (port), "a" (value));
}
void kernaux_arch_i386_outportd(
const unsigned short port,
const unsigned int value
) {
asm volatile("outd %1, %0" : : "dN" (port), "a" (value));
}
#ifdef __cplusplus
}
#endif