diff options
author | Danny Holman <dholman@gymli.org> | 2022-01-15 16:24:08 -0600 |
---|---|---|
committer | Danny Holman <dholman@gymli.org> | 2022-01-15 16:25:41 -0600 |
commit | 06121c7075e91056820c674f192be460ef5eb656 (patch) | |
tree | 2d49c1ebfc0255877bf613d53dfd2723e48d8383 /arch/i386/boot | |
parent | acc73186bc3de78ceb0a54cbf2605dff1b9a6d62 (diff) |
arch: i386: add support for IRQs and system calls
Add support for rudementary system calls and IRQ interrupts.
Signed-off-by: Danny Holman <dholman@gymli.org>
Diffstat (limited to 'arch/i386/boot')
-rw-r--r-- | arch/i386/boot/boot.s | 4 | ||||
-rw-r--r-- | arch/i386/boot/idt.c | 6 | ||||
-rw-r--r-- | arch/i386/boot/pic.c | 2 | ||||
-rw-r--r-- | arch/i386/boot/syscall.c | 21 | ||||
-rw-r--r-- | arch/i386/boot/syscall.h | 9 |
5 files changed, 40 insertions, 2 deletions
diff --git a/arch/i386/boot/boot.s b/arch/i386/boot/boot.s index 4b32ca2..91df039 100644 --- a/arch/i386/boot/boot.s +++ b/arch/i386/boot/boot.s @@ -71,6 +71,10 @@ _start: call idt_install call pic_remap + pushl $1 + pushl print_hello + call register_syscall + call kernel_main call jump_userspace diff --git a/arch/i386/boot/idt.c b/arch/i386/boot/idt.c index dbcfaa2..0789a17 100644 --- a/arch/i386/boot/idt.c +++ b/arch/i386/boot/idt.c @@ -1,4 +1,4 @@ -#include <kernel/idt.h> +#include "syscall.h" #include <kernel/isr.h> #include <kernel/io.h> #include <kernel/pic.h> @@ -157,6 +157,10 @@ void idt_install(void) { idt_set_gate(30, isr_stub_30, 0x08, IDT_EXCEPTION); idt_set_gate(31, isr_stub_31, 0x08, IDT_EXCEPTION); + idt_set_gate(128, syscall_stub, 0x08, IDT_INTERRUPT); + + register_syscall(halt_catch_fire, 0); + __asm__ volatile("lidt %0" : : "memory"(idtr)); __asm__ volatile("sti"); } diff --git a/arch/i386/boot/pic.c b/arch/i386/boot/pic.c index 607023c..69a0785 100644 --- a/arch/i386/boot/pic.c +++ b/arch/i386/boot/pic.c @@ -51,7 +51,7 @@ void irq_set_mask(uint8_t irq) { outb(port, data); } -void irq_clear_mask(unsigned char irq) { +void irq_clear_mask(uint8_t irq) { uint16_t port; uint8_t data; diff --git a/arch/i386/boot/syscall.c b/arch/i386/boot/syscall.c new file mode 100644 index 0000000..fb613b3 --- /dev/null +++ b/arch/i386/boot/syscall.c @@ -0,0 +1,21 @@ +#include "syscall.h" +#include <kernel/io.h> +#include <stddef.h> + +void *(*syscall_handlers[30])(struct isr_frame *frame); + +void syscall_dispatch(struct isr_frame *frame) { + if (syscall_handlers[frame->eax] != NULL) + syscall_handlers[frame->eax](frame); + else + kprintf("Error: Invalid system call number: %d\n", frame->eax); + __asm__ volatile("cli;hlt"); +} + +void register_syscall(void *handler(struct isr_frame*), int num) { + syscall_handlers[num] = handler; +} + +void print_hello(struct isr_frame *frame) { + kprintf("Hello syscall\n"); +} diff --git a/arch/i386/boot/syscall.h b/arch/i386/boot/syscall.h new file mode 100644 index 0000000..376fb7c --- /dev/null +++ b/arch/i386/boot/syscall.h @@ -0,0 +1,9 @@ +#ifndef I386_SYSCALL_H +#define I386_SYSCALL_H + +#include <kernel/isr.h> + +void syscall_dispatch(struct isr_frame *frame); +void register_syscall(void *handler(struct isr_frame*), int num); + +#endif |