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os-k/include/kernel/iomisc.h

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//----------------------------------------------------------------------------//
// GNU GPL OS/K //
// //
// Desc: Miscenalleous I/O functions and inlines //
// //
// //
// Copyright © 2018-2019 The OS/K Team //
// //
// This file is part of OS/K. //
// //
// OS/K 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 //
// any later version. //
// //
// OS/K 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 OS/K. If not, see <https://www.gnu.org/licenses/>. //
//----------------------------------------------------------------------------//
#ifndef _KALKERN_BASE_H
#include <kernel/base.h>
#endif
#ifndef _KALKERN_IOMISC_H
#define _KALKERN_IOMISC_H
//------------------------------------------//
// IRQ-related stuff //
//------------------------------------------//
//
// Returns whether IRQs are enabled
//
static inline bool KeCheckIRQStatus(void) {
ulong flags;
asm volatile ("pushf\n\tpop %0" : "=g"(flags) );
return flags & (1 << 9);
}
//
// Disables IRQs
//
#define KeDisableIRQs() asm volatile ("cli")
//
// Enables IRQs
//
#define KeEnableIRQs() asm volatile ("sti")
//
// Disables IRQs, but saves its previous state
//
static inline ulong KePauseIRQs(void) {
ulong flags;
asm volatile ("pushf\n\tcli\n\tpop %0" : "=r"(flags) : : "memory");
return flags;
}
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extern void IoSendEOItoPIC(uchar isr);
extern void IoEnableNMI(void);
extern void IoDisableNMI(void);
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extern void IdtRegisterIrq(void (*isr)(ISRFrame_t *regs), uchar irq, uchar flags);
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//
// Restore IRQ flag to its state before KePauseIRQs
//
#define KeRestoreIRQs(flags) asm("push %0\n\tpopf" : : "rm"(flags) : "memory","cc")
//------------------------------------------//
// 101 ways to hang the system //
//------------------------------------------//
//
// Pauses CPU until next interuption
//
#define KePauseCPU() asm volatile ("sti\n\thlt")
//
// Halts the CPU indefinitely
//
#define KeHaltCPU() do { asm volatile ("hlt"); } while (1)
//
// Halts the system, making sure it won't recover
//
#define KeCrashSystem() do { KeDisableIRQs(); KeHaltCPU(); } while (1)
//------------------------------------------//
// Ports I/O //
//------------------------------------------//
static inline void IoWriteByteOnPort(port_t port, uchar val)
{ asm volatile ("outb %1, %0" : : "dN" (port), "a" (val)); }
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static inline uchar IoReadByteFromPort(port_t port) {
uchar ret;
asm volatile ("inb %1, %0" : "=a"(ret) : "Nd"(port));
return ret;
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}
static inline ushort IoReadWordFromPort(port_t port) {
ushort ret;
asm volatile ("inw %1, %0" : "=a"(ret) : "Nd"(port));
return ret;
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}
static inline ushort IoReadDWordFromPort(port_t port) {
uint ret;
asm volatile ("inl %1, %0" : "=a"(ret) : "Nd"(port));
return ret;
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}
//------------------------------------------//
// Misc. I/O //
//------------------------------------------//
//
// Wait for completion of some I/O operation
// Port 0x80 is used for 'checkpoints' during POST
//
#define IoWaitCompletion() IoWriteByteOnPort(0x80, 0)
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#endif