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