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