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Add IRQHandler class that can be subclasses to handle an IRQ.

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Also move Keyboard to a class implementation using this pattern.
This commit is contained in:
Andreas Kling 2018-10-22 12:58:29 +02:00
parent 8f941561b4
commit a9ca75c98b
8 changed files with 152 additions and 100 deletions
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65
Kernel/i386.cpp
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@ -5,6 +5,8 @@
#include "Assertions.h"
#include "Task.h"
#include "MemoryManager.h"
#include "IRQHandler.h"
#include "PIC.h"
struct DescriptorTablePointer {
WORD size;
@ -16,6 +18,8 @@ static DescriptorTablePointer s_gdtr;
static Descriptor* s_idt;
static Descriptor* s_gdt;
static IRQHandler** s_irqHandler;
static WORD s_gdtLength;
WORD allocateGDTEntry()
@ -27,6 +31,26 @@ WORD allocateGDTEntry()
return newGDTEntry;
}
extern "C" void handleIRQ();
extern "C" void commonIRQEntry();
asm(
".globl commonIRQEntry\n"
"commonIRQEntry: \n"
" pusha\n"
" pushw %ds\n"
" pushw %es\n"
" pushw %ss\n"
" pushw %ss\n"
" popw %ds\n"
" popw %es\n"
" call handleIRQ\n"
" popw %es\n"
" popw %ds\n"
" popa\n"
" iret\n"
);
extern volatile dword exception_state_dump;
extern volatile word exception_code;
asm(
@ -290,6 +314,20 @@ static void unimp_trap()
HANG;
}
void registerIRQHandler(byte irq, IRQHandler& handler)
{
ASSERT(!s_irqHandler[irq]);
s_irqHandler[irq] = &handler;
kprintf("irq handler for %u: %p\n", irq, &handler);
registerInterruptHandler(IRQ_VECTOR_BASE + irq, commonIRQEntry);
}
void unregisterIRQHandler(byte irq, IRQHandler& handler)
{
ASSERT(s_irqHandler[irq] == &handler);
s_irqHandler[irq] = nullptr;
}
void registerInterruptHandler(BYTE index, void (*f)())
{
s_idt[index].low = 0x00080000 | LSW((f));
@ -351,6 +389,11 @@ void idt_init()
registerInterruptHandler(0x57, irq7_handler);
s_irqHandler = new IRQHandler*[16];
for (byte i = 0; i < 16; ++i) {
s_irqHandler[i] = nullptr;
}
flushIDT();
}
@ -358,3 +401,25 @@ void loadTaskRegister(WORD selector)
{
asm("ltr %0"::"r"(selector));
}
void handleIRQ()
{
WORD isr = PIC::getISR();
if (!isr) {
kprintf("Spurious IRQ\n");
return;
}
byte irq;
for (byte i = 0; i < 16; ++i) {
if (isr & (1 << i)) {
irq = i;
break;
}
}
if (s_irqHandler[irq])
s_irqHandler[irq]->handleIRQ();
PIC::eoi(irq);
}