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Sync/kernel/interrupts.c

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/************************
*** Team Kitty, 2019 ***
*** Sync ***
***********************/
/* This file contains all of the ISR and IRQ
* (Interrupt Service Request) functions.
*
* As they use the GCC interrupt attribute,
* this file must be compiled without red-
* zone protection, thus all of these
* functions are in their own file to
* accomodate this.
*
* Additionally, the kernel now has SSE/AVX support.
* So this file and this file *alone* must be compiled with
* -mgeneral-regs-only
*
* Calling a function like so:
*
* __attribute__((interrupt)) isr1(registers_t* frame) {}
*
* allows the function to be used to serve
* interrupts - GCC compiles it under unique
* conditions, as it preserves the state of
* the processor and stack between execution,
* as well as using the IRET instruction to
* return to the middle of the previous function.
*
* There is also a version of the interrupt
* attribute which allows for error handlers,
* these having a size_t input as an error code.
*/
#include <kernel.h>
#ifdef __x86_64__
typedef unsigned long long int uword_t;
#else
typedef unsigned int uword_t;
#endif
/* All of the ISR routines call this function for now.
! This function is NOT leaf, and it might clobber the stack.
! Be careful!
*/
void ISR_Common(INTERRUPT_FRAME* Frame, size_t Exception) {
/* Only the first 32 ISR/IRQs are reserved for exceptions by the CPU. We can handle up to 512 interrupts total, though. */
if(Exception < 32) {
/* exception_messages is an array of c-strings defined in kernel.h */
// TODO: Serial!
//serial_print(0x3F8, exception_messages[Exception]);
//serial_print(0x3F8, " Exception.\r\n");
printf("%s exception!", ExceptionStrings[Exception]);
panic();
}
}
/* The common handler for exceptions that throw error codes, which give us useful insight
into what went wrong. In pure Curle style, though, we just ignore the error code. */
void ISR_Error_Common(EXCEPTION_FRAME* Frame, size_t Exception) {
if(Exception < 32) {
//serial_print(0x3F8, ExceptionStrings[Exception]);
//serial_printf(0x3F8, " Exception. Context given: %d\r\n", Frame->ErrorCode);
printf("%s exception. Context: %x", ExceptionStrings[Exception], Frame->ErrorCode);
panic();
}
}
/* Likewise, this function is common to all IRQ handlers. It calls the assigned routine,
which was set up earlier by irq_install.*/
void IRQ_Common(INTERRUPT_FRAME* Frame, size_t Interrupt) {
// First we need to define a function pointer..
void (*Handler)(INTERRUPT_FRAME* Frame);
// Tell the user we've got an interrupt in..
//serial_print(0x3F8, "[INFO] Received IRQ: " + interrupt);
printf("[INFO] Received IRQ: %x", Interrupt);
/* We set all uninitialized routines to 0, so the if(handler) check here allows us to
safely tell whether we've actually got something for this IRQ. */
Handler = IRQ_Handlers[Interrupt];
// If there's something there,
if(Handler)
// Call the handler.
Handler(Frame);
/* The Slave PIC must be told it's been read in order to receive another 8+ IRQ. */
if(Interrupt > 7)
WritePort(0xA0, 0x20, 1);
/* In either case, we tell the Master PIC it's been read to receive any IRQ. */
WritePort(0x20, 0x20, 1);
}
/* However, in order to actually be able to receive IRQs, we need to remap the PICs. */
void RemapIRQControllers() {
/* 0x20 is the Master PIC,
0xA0 is the Slave PIC. */
WritePort(0x20, 0x11, 1);
WritePort(0xA0, 0x11, 1);
WritePort(0x21, 0x20, 1);
WritePort(0xA1, 0x28, 1);
WritePort(0x21, 0x04, 1);
WritePort(0xA1, 0x02, 1);
WritePort(0x21, 0x01, 1);
WritePort(0xA1, 0x01, 1);
WritePort(0x21, 0x0, 1);
WritePort(0xA1, 0x0, 1);
}
/* In order to actually handle the IRQs, though, we need to tell the kernel *where* the handlers are. */
/* A simple wrapper that adds a function pointer to the IRQ array. */
void InstallIRQHandler(int IRQ, void (*Handler)(INTERRUPT_FRAME* Frame)) {
IRQ_Handlers[IRQ] = Handler;
}
/* A simple wrapper that unlinks a function pointer, rendering the IRQ unused. */
void UninstallIRQHandler(int IRQ) {
IRQ_Handlers[IRQ] = 0; // 0 is used in the common check to make sure that the function is callable.
// This removes this irq from that check, ergo the function will no longer be called.
}
/* The interrupt numbers, their meanings, and
* special information is laid out below:
*
* 0 - Divide by Zero
* 1 - Debug
* 2 - Non-Maskable
* 3 - Breakpoint
* 4 - Into Detected Overflow
* 5 - Out of Bounds
* 6 - Invalid Opcode
* 7 - No Coprocessor
* 8 - Double Fault * (With Error)
* 9 - Coprocessor Segment Overrun
* 10 - Bad TSS * (With Error)
* 11 - Segment Not Present * (With Error)
* 12 - Stack Fault * (With Error)
* 13 - General Protection Fault * (With Error)
* 14 - Page Fault * (With Error)
* 15 - Unknown Interrupt
* 16 - Coprocessor Fault
* 17 - Alignment Check
* 18 - Machine Check
* 19 to 31 - Reserved
*/
__attribute__((interrupt)) void ISR0Handler(INTERRUPT_FRAME* Frame) {
// This baby is the timer.
// TODO: Change ISR0Handler to TimerHandler.
// Here, we can do some timer related stuff.
// For starts, we just tick a timer that tells us how long the program has been running.
time++;
ISR_Common(Frame, 0);
}
__attribute__((interrupt)) void ISR1Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 1);
}
__attribute__((interrupt)) void ISR2Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 2);
}
__attribute__((interrupt)) void ISR3Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 3);
}
__attribute__((interrupt)) void ISR4Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 4);
}
__attribute__((interrupt)) void ISR5Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 5);
}
__attribute__((interrupt)) void ISR6Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 6);
}
__attribute__((interrupt)) void ISR7Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 7);
}
__attribute__((interrupt)) void ISR8Handler(EXCEPTION_FRAME* Frame) {
ISR_Error_Common(Frame, 8);
}
__attribute__((interrupt)) void ISR9Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 9);
}
__attribute__((interrupt)) void ISR10Handler(EXCEPTION_FRAME* Frame) {
ISR_Error_Common(Frame, 10);
}
__attribute__((interrupt)) void ISR11Handler(EXCEPTION_FRAME* Frame) {
ISR_Error_Common(Frame, 11);
}
__attribute__((interrupt)) void ISR12Handler(EXCEPTION_FRAME* Frame) {
ISR_Error_Common(Frame, 12);
}
__attribute__((interrupt)) void ISR13Handler(EXCEPTION_FRAME* Frame) {
ISR_Error_Common(Frame, 13);
}
__attribute__((interrupt)) void ISR14Handler(EXCEPTION_FRAME* Frame) {
ISR_Error_Common(Frame, 14);
}
__attribute__((interrupt)) void ISR15Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 15);
}
__attribute__((interrupt)) void ISR16Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 16);
}
__attribute__((interrupt)) void ISR17Handler(EXCEPTION_FRAME* Frame) {
ISR_Error_Common(Frame, 17);
}
__attribute__((interrupt)) void ISR18Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 18);
}
__attribute__((interrupt)) void ISR19Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 19);
}
__attribute__((interrupt)) void ISR20Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 20);
}
__attribute__((interrupt)) void ISR21Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 21);
}
__attribute__((interrupt)) void ISR22Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 22);
}
__attribute__((interrupt)) void ISR23Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 23);
}
__attribute__((interrupt)) void ISR24Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 24);
}
__attribute__((interrupt)) void ISR25Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 25);
}
__attribute__((interrupt)) void ISR26Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 26);
}
__attribute__((interrupt)) void ISR27Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 27);
}
__attribute__((interrupt)) void ISR28Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 28);
}
__attribute__((interrupt)) void ISR29Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 29);
}
__attribute__((interrupt)) void ISR30Handler(EXCEPTION_FRAME* Frame) {
ISR_Error_Common(Frame, 30);
}
__attribute__((interrupt)) void ISR31Handler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 31);
}
__attribute__((interrupt)) void ReservedISRHandler(INTERRUPT_FRAME* Frame) {
ISR_Common(Frame, 33); // if < 32, isn't handled.
// Effectively disables this ISR.
}
__attribute__((interrupt)) void irq0(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 0);
}
__attribute__((interrupt)) void irq1(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 1);
}
__attribute__((interrupt)) void irq2(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 2);
}
__attribute__((interrupt)) void irq3(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 3);
}
__attribute__((interrupt)) void irq4(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 4);
}
__attribute__((interrupt)) void irq5(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 5);
}
__attribute__((interrupt)) void irq6(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 6);
}
__attribute__((interrupt)) void irq7(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 7);
}
__attribute__((interrupt)) void irq8(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 8);
}
__attribute__((interrupt)) void irq9(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 9);
}
__attribute__((interrupt)) void irq10(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 10);
}
__attribute__((interrupt)) void irq11(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 11);
}
__attribute__((interrupt)) void irq12(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 12);
}
__attribute__((interrupt)) void irq13(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 13);
}
__attribute__((interrupt)) void irq14(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 14);
}
__attribute__((interrupt)) void irq15(INTERRUPT_FRAME* Frame) {
IRQ_Common(Frame, 15);
}
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