Nigel/BarinkOS
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Implemented the basis for syscalls

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A software interrupt with vector 0x50 will cause a syscall to start executing.
The EAX register will hold the syscall_num.
Other registers and the stack can be used to hold further arguments.
This commit is contained in:
Nigel Barink
2023-02-27 00:34:30 +01:00
parent 2d0bb16fad
commit 5781f730d9
7 changed files with 141 additions and 143 deletions
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35
kernel/interrupts/idt.cpp
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@ -3,6 +3,9 @@
#include "../drivers/ps-2/keyboard.h"
#include "../i386/processor.h"
#include "../memory/VirtualMemoryManager.h"
#include "../syscalls.h"
IDT_entry idt_table[256];
IDT_ptr idt_ptr;
@ -18,7 +21,7 @@ void set_id_entry (uint8_t num , uint32_t base, uint16_t sel, uint8_t flags){
void irs_handler (registers* regs) {
uint32_t FaultingAddress;
//printf("(IRS) Interrupt number: %d \r", regs.int_no);
printf("(IRS) Interrupt number: %d \n EAX: ", regs->int_no, regs->eax);
switch (regs->int_no)
{
case 0:
@ -259,6 +262,29 @@ void irs_handler (registers* regs) {
printf("EBP: 0x%x\n", regs->ebp);
break;
case 50:
printf("SYSTEMCALL\n");
printf("EAX 0x%x\n", regs->eax);
switch (regs->eax) {
case 0x0:
printf("test!\n");
break;
case 0x5:
sys_open();
break;
case 0x10:
sys_read((FILE*)regs->ebx, (char*)regs->ecx);
break;
case 0x20:
sys_write((FILE*)regs->ebx, (const char*)regs->ecx, regs->edx);
break;
case 0x666:
sys_version();
break;
};
break;
default:
// PANIC!!!
break;
@ -269,9 +295,6 @@ void irs_handler (registers* regs) {
}
void irq_handler (registers regs) {
switch (regs.int_no) {
case 0:
pit_tick++;
@ -328,7 +351,7 @@ void irq_handler (registers regs) {
}
void initidt(){
// Initialise the IDT pointer
// Initialize the IDT pointer
idt_ptr.length = sizeof(IDT_entry) * 255;
idt_ptr.base = (uint32_t)&idt_table;
@ -371,7 +394,7 @@ void initidt(){
set_id_entry(30, (uint32_t) irs30 , 0x08, 0x8E);
set_id_entry(31, (uint32_t) irs31 , 0x08, 0x8E);
set_id_entry(0x50, (uint32_t) irs50, 0x08, 0x8E);
//print_serial("Remapping PIC\n");
PIC_remap(0x20, 0x28);

1
kernel/interrupts/idt.h
View File

@ -70,6 +70,7 @@ extern "C" {
extern void irs29 ();
extern void irs30 ();
extern void irs31 ();
extern void irs50();