1
0
Fork 0
mirror of https://gitlab.com/sortix/sortix.git synced 2023-02-13 20:55:38 -05:00
sortix--sortix/kernel/x86-family/x86-family.cpp
2014-12-03 14:19:49 +01:00

135 lines
3.2 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2014.
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 <errno.h>
#include <msr.h>
#include <stdint.h>
#include <sortix/kernel/ioport.h>
#include <sortix/kernel/kernel.h>
#include <sortix/kernel/syscall.h>
#include "gdt.h"
namespace Sortix {
namespace CPU {
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 = inport8(KEYBOARD_INTERFACE);
if ( byte & KEYBOARD_DATA )
inport8(KEYBOARD_IO);
} while ( byte & USER_DATA );
// CPU reset command.
uint8_t KEYBOARD_RESET_CPU = 0xFE;
// Now pulse the CPU reset line and reset.
outport8(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
namespace Sortix {
uint64_t sys_rdmsr(uint32_t msrid)
{
switch ( msrid )
{
case MSRID_FSBASE:
#if defined(__i386__)
return GDT::GetFSBase();
#elif defined(__x86_64__)
return rdmsr(msrid);
#endif
case MSRID_GSBASE:
#if defined(__i386__)
return GDT::GetGSBase();
#elif defined(__x86_64__)
return rdmsr(msrid);
#endif
default:
return errno = EPERM, UINT64_MAX;
};
}
uint64_t sys_wrmsr(uint32_t msrid, uint64_t value)
{
switch ( msrid )
{
case MSRID_FSBASE:
#if defined(__i386__)
if ( UINT32_MAX < value )
return errno = EINVAL, UINT64_MAX;
return GDT::SetFSBase((uint32_t) value), value;
#elif defined(__x86_64__)
if ( value >> 48 != 0x0000 && value >> 48 != 0xFFFF )
return errno = EINVAL, UINT64_MAX;
return wrmsr(msrid, value);
#endif
case MSRID_GSBASE:
#if defined(__i386__)
if ( UINT32_MAX < value )
return errno = EINVAL, UINT64_MAX;
return GDT::SetGSBase((uint32_t) value), value;
#elif defined(__x86_64__)
if ( value >> 48 != 0x0000 && value >> 48 != 0xFFFF )
return errno = EINVAL, UINT64_MAX;
return wrmsr(msrid, value);
#endif
default:
return errno = EPERM, UINT64_MAX;
};
}
} // namespace Sortix