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Wrap IRQ with ASM

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This commit is contained in:
Mathieu Maret 2021-10-07 21:23:32 +02:00
parent 590311f3f1
commit ddc0c4c84a
9 changed files with 50 additions and 38 deletions
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4
Makefile
View File

@ -17,7 +17,7 @@ CPPFLAGS += $(foreach dir, $(SUBDIRS), -I$(dir))
asmsrc=$(wildcard arch/$(ARCH)/boot/*.asm)
asmobj=$(asmsrc:%.asm=%.o)
csrc=$(shell find $(SUBDIRS) -type f -name "*.c")# $(wildcard *.c)
cobj=$(csrc:%.c=%.o) arch/$(ARCH)/cpu_context_switch.o arch/$(ARCH)/irq_pit.o
cobj=$(csrc:%.c=%.o) arch/$(ARCH)/cpu_context_switch.o arch/$(ARCH)/irq_pit.o arch/$(ARCH)/irq_wrappers.o
deps = $(csrc:%.c=%.d)
kernel kernel.sym &: $(asmobj) $(cobj) linker.ld
@ -37,8 +37,6 @@ disk.img:
#https://gcc.gnu.org/onlinedocs/gcc/x86-Function-Attributes.html#x86-Function-Attributes
arch/$(ARCH)/exception_handler.o:arch/$(ARCH)/exception_handler.c
$(CC) $(CFLAGS) $(CPPFLAGS) -mgeneral-regs-only -c $< -o $@
arch/$(ARCH)/irq_handler.o:arch/$(ARCH)/irq_handler.c
$(CC) $(CFLAGS) $(CPPFLAGS) -mgeneral-regs-only -c $< -o $@
%.o:%.asm
$(AS) $(ASFLAGS) -o $@ $<

2
README.md
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@ -21,7 +21,7 @@ To generate iso image
you can also test it
`make self_test`
`make test`
# Debug

3
arch/x86/interrupt.h
View File

@ -52,6 +52,3 @@ DECLARE_INTERRUPT(EXCEPTION_RESERVED_11)
// IRQ
void pit_handler(struct interrupt_frame *frame);
void keyboard_handler(struct interrupt_frame *frame);
void timer_handler(struct interrupt_frame *frame);
void serial_handler(struct interrupt_frame *frame);

41
arch/x86/irq.c
View File

@ -1,7 +1,10 @@
#include "irq.h"
#include "idt.h"
#include "io.h"
#include "klibc.h"
#include "pic.h"
#include "stdarg.h"
#include "types.h"
int irqSetup()
{
@ -9,10 +12,28 @@ int irqSetup()
return 0;
}
// Assembly defined array. This is used to wrap C function than cannot:
// * get some cpu state
// * return using "iret" instead of "ret" without some compiler __attribute__
extern vaddr_t irq_handler_wrapper_array[IRQ_NUM];
irq_handler irq_handler_array[IRQ_NUM] = {
NULL,
};
void interrupt_handler_pic(int interrupt, struct interrupt_frame *frame)
{
if (0 > interrupt || IRQ_NUM <= interrupt) {
pr_err("Trying to handle unknow interrupt %d\n", interrupt);
return;
}
EOIIrq(interrupt);
if (irq_handler_array[interrupt] != NULL)
irq_handler_array[interrupt](frame);
}
int irqSetRoutine(int irq, irq_handler handler)
{
uint32_t flags;
@ -32,3 +53,23 @@ int irqSetRoutine(int irq, irq_handler handler)
restore_IRQs(flags);
return 0;
}
int irqSetRoutineWrapped(int irq, irq_handler handler)
{
uint32_t flags;
if ((irq < 0) || irq >= IRQ_NUM)
return -1;
disable_IRQs(flags);
irq_handler_array[irq] = handler;
if (handler != NULL) {
int ret = idt_set_handler(IRQ_INTERRUPT_BASE_ADDRESS + irq,
(unsigned int)irq_handler_wrapper_array[irq], 0);
if (!ret)
enableIrq(irq);
}
restore_IRQs(flags);
return 0;
}

3
arch/x86/irq.h
View File

@ -37,4 +37,7 @@
// __attribute__((interrupt)) void (*irq_handler)(int irq);
typedef void (*irq_handler)(struct interrupt_frame *frame);
int irqSetup();
// For C coded handler (The interrupt specific part is managed by a wrapper)
int irqSetRoutineWrapped(int irq, irq_handler handler);
// For ASM handler taking care of the special instruction needed by an IRQ handler
int irqSetRoutine(int irq, irq_handler handler);

29
arch/x86/irq_handler.c
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@ -1,29 +0,0 @@
#include "interrupt.h"
#include "io.h"
#include "irq.h"
#include "keyboard.h"
#include "pic.h"
#include "serial.h"
#include "vga.h"
// Need GCC > 6
__attribute__((interrupt)) void keyboard_handler(struct interrupt_frame *frame)
{
EOIIrq(IRQ_KEYBOARD);
keyboard_do_irq();
(void)frame;
}
__attribute__((interrupt)) void timer_handler(struct interrupt_frame *frame)
{
static int timeCnt = 0;
EOIIrq(IRQ_TIMER);
VGAPrintf(RED, BLACK, 20, VGA_HEIGHT - 1, "IRQ %d", timeCnt++);
(void)frame;
}
__attribute__((interrupt)) void serial_handler(struct interrupt_frame *frame)
{
EOIIrq(IRQ_COM1);
serialDoIrq(frame);
}

1
core/klibc.h
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@ -1,4 +1,5 @@
#pragma once
#include "assert.h"
#include "stdarg.h"
#include "minmax.h"

3
core/main.c
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@ -7,6 +7,7 @@
#include "interrupt.h"
#include "io.h"
#include "irq.h"
#include "keyboard.h"
#include "klibc.h"
#include "kthread.h"
#include "mem.h"
@ -134,7 +135,7 @@ void kmain(unsigned long magic, unsigned long addr)
}
printf("Setting up IRQ handlers\n");
irqSetRoutine(IRQ_KEYBOARD, keyboard_handler);
irqSetRoutineWrapped(IRQ_KEYBOARD, keyboard_do_irq);
printf("Enabling HW interrupts\n");
// Enabling the HW interrupts

2
drivers/serial.c
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@ -32,7 +32,7 @@ void serialSetup(int speed)
UART_1_STOP_BIT); // 8 bits, no parity, one stop bit
outb(PORT + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold
outb(PORT + 4, 0x0B); // IRQs enabled, RTS/DSR set
irqSetRoutine(IRQ_COM1, serial_handler);
irqSetRoutineWrapped(IRQ_COM1, serialDoIrq);
}
int isTransmitEmpty()