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kernel: Patches to run processes in Ring 3.

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RaphProductions 2025-05-07 13:14:18 +02:00
parent 8f6399e309
commit e6a2c1e240
10 changed files with 271 additions and 22 deletions
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5
kernel/src/sys/arch/x86_64/gdt.c
View file

@ -2,6 +2,7 @@
#include <stdint.h>
#include <sys/arch/x86_64/gdt.h>
#include <sys/log.h>
#include <mm/memop.h>
gdt_table def_table = {
{
@ -25,10 +26,10 @@ gdt_table def_table = {
tssr tss_list[256]; // One tssr per CPU
void gdt_init() {
void gdt_init( char* kstack ) {
// TODO: adapt for multiprocessor kernel
tss_list[0].iopb = sizeof(tssr);
tss_list[0].rsp[0] = (uint64_t)kstack;
uintptr_t tss = (uintptr_t)&tss_list[0];
def_table.tss_entry.length = sizeof(tss_entry);

4
kernel/src/sys/arch/x86_64/gdt.h
View file

@ -26,7 +26,7 @@ typedef struct {
typedef struct {
uint32_t resv;
uint64_t rsp[3];
uint64_t rsp[4];
uint64_t resv1;
uint64_t ist[7];
uint64_t resv2;
@ -34,4 +34,4 @@ typedef struct {
uint16_t iopb;
} __attribute__((packed)) tssr; // Per CPU
void gdt_init();
void gdt_init(char* kstack);

6
kernel/src/sys/arch/x86_64/idt.c
View file

@ -29,10 +29,16 @@ void idt_init() {
idtr.limit = (uint16_t)sizeof(idt_entry_t) * 256 - 1;
for (uint16_t vector = 0; vector <= 256; vector++) {
if (vector == 0x80)
continue; // We skip the syscall handler, since it should be called from user space.
idt_set_descriptor(vector, isr_stub_table[vector], 0x8E);
vectors[vector] = 1;
}
uint16_t vector = 0x80;
idt_set_descriptor(vector, isr_stub_table[vector], 0xEE);
vectors[vector] = 1;
pic_init();
pic_unmask_irq(1);

12
kernel/src/sys/arch/x86_64/interrupts.c
View file

@ -39,6 +39,14 @@ void exception_handler(registers_t *regs) {
if (regs->int_no < 32) {
//panic(kmode_cpu_exception, regs);
log("ints - %d (RIP: %p, ERR: %d)\n", regs->int_no, regs->rip, regs->err_code);
if(regs->int_no == 0xe) {
uint64_t cr2;
asm ("mov %%cr2, %0" : "=r"(cr2));
log("ints - PF: Faulting location: %p\n", cr2);
log("ints - PF: Faulting page flags: %p\n", vmm_get_flags(vmm_current_pm, cr2));
}
dump_backtrace(regs);
asm ("cli");
while (1)
@ -63,7 +71,9 @@ void exception_handler(registers_t *regs) {
}
else if (regs->int_no == 0x80)
{
log("syscall - Hello World! Current process: %s", curr_proc->name);
log("syscall - Hello World! Current process: %s\n", curr_proc->name);
if (curr_proc->flags == SCHED_USER_PROCESS)
log("syscall - Btw we made it to userspace, baby!\n", curr_proc->name);
}
//logln(info, "arch/ints", "Received interrupt %d\n", regs->int_no);
pic_ack(regs->int_no - 32);