haiku.git

/*
 * Copyright 2006-2022, Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 */


#include <arch/generic/debug_uart.h>


void
DebugUART::Out8(int reg, uint8 value)
{
#if defined(__ARM__) || defined(__aarch64__)
	// 32-bit aligned
	*((uint8 *)Base() + reg * sizeof(uint32)) = value;
#elif defined(__i386__) || defined(__x86_64__)
	// outb for access to IO space.
	if ((Base() + reg) <= 0xFFFF)
		__asm__ volatile ("outb %%al,%%dx" : : "a" (value), "d" (Base() + reg));
	else
		*((uint8 *)Base() + reg) = value;
#else
	*((uint8 *)Base() + reg) = value;
#endif
}


uint8
DebugUART::In8(int reg)
{
#if defined(__ARM__) || defined(__aarch64__)
	// 32-bit aligned
	return *((uint8 *)Base() + reg * sizeof(uint32));
#elif defined(__i386__) || defined(__x86_64__)
	// inb for access to IO space.
	if ((Base() + reg) <= 0xFFFF) {
		uint8 _v;
		__asm__ volatile ("inb %%dx,%%al" : "=a" (_v) : "d" (Base() + reg));
		return _v;
	}
	return *((uint8 *)Base() + reg);
#else
	return *((uint8 *)Base() + reg);
#endif
}


void
DebugUART::Barrier()
{
	// Simple memory barriers
#if defined(__POWERPC__)
	asm volatile("eieio; sync");
#elif defined(__ARM__) || defined(__aarch64__)
	asm volatile ("" : : : "memory");
#endif
}