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sortix--sortix/kernel/x86-family/x86-family.cpp

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/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011.
This file is part of Sortix.
Sortix is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
You should have received a copy of the GNU General Public License along with
Sortix. If not, see <http://www.gnu.org/licenses/>.
x86-family/x86-family.cpp
CPU stuff for the x86 CPU family.
*******************************************************************************/
#include <stdint.h>
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#include <sortix/kernel/kernel.h>
namespace Sortix {
namespace CPU {
void OutPortB(uint16_t port, uint8_t value)
{
asm volatile ("outb %1, %0" : : "dN" (port), "a" (value));
}
void OutPortW(uint16_t port, uint16_t value)
{
asm volatile ("outw %1, %0" : : "dN" (port), "a" (value));
}
void OutPortL(uint16_t port, uint32_t value)
{
asm volatile ("outl %1, %0" : : "dN" (port), "a" (value));
}
uint8_t InPortB(uint16_t port)
{
uint8_t result;
asm volatile("inb %1, %0" : "=a" (result) : "dN" (port));
return result;
}
uint16_t InPortW(uint16_t port)
{
uint16_t result;
asm volatile("inw %1, %0" : "=a" (result) : "dN" (port));
return result;
}
uint32_t InPortL(uint16_t port)
{
uint32_t result;
asm volatile("inl %1, %0" : "=a" (result) : "dN" (port));
return result;
}
void Reboot()
{
// Keyboard interface IO port: data and control.
const uint16_t KEYBOARD_INTERFACE = 0x64;
// Keyboard IO port.
const uint16_t KEYBOARD_IO = 0x60;
// Keyboard data is in buffer (output buffer is empty) (bit 0).
const uint8_t KEYBOARD_DATA = 1 << 0;
// User data is in buffer (command buffer is empty) (bit 1).
const uint8_t USER_DATA = 1 << 1;
// Disable interrupts.
asm volatile("cli");
// Clear all keyboard buffers (output and command buffers).
uint8_t byte;
do
{
byte = InPortB(KEYBOARD_INTERFACE);
if ( byte & KEYBOARD_DATA )
InPortB(KEYBOARD_IO);
} while ( byte & USER_DATA );
// CPU reset command.
uint8_t KEYBOARD_RESET_CPU = 0xFE;
// Now pulse the CPU reset line and reset.
OutPortB(KEYBOARD_INTERFACE, KEYBOARD_RESET_CPU);
// If that didn't work, just halt.
asm volatile("hlt");
}
void ShutDown()
{
// TODO: Unimplemented, just reboot.
Reboot();
}
} // namespace CPU
} // namespace Sortix