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// MIT License, Copyright (c) 2020 Marvin Borner
#include <assert.h>
#include <boot.h>
#include <cpu.h>
#include <interrupts.h>
#include <load.h>
#include <mem.h>
#include <print.h>
#include <proc.h>
#include <str.h>
#include <timer.h>
u32 pid = 0;
struct proc *root;
struct proc *current;
struct proc *last;
void scheduler(struct regs *regs)
{
if (current)
memcpy(¤t->regs, regs, sizeof(struct regs));
timer_handler();
if (current && current->next)
current = current->next;
else
current = root;
while (current->state == PROC_ASLEEP) {
if (!current->next) {
assert(root->state == PROC_RUNNING || pid > 1);
current = root;
} else {
current = current->next;
}
}
/* proc_print(); */
memcpy(regs, ¤t->regs, sizeof(struct regs));
if (current->event) {
// TODO: Modify and backup EIP
printf("Event %d for pid %d\n", current->event, current->pid);
// TODO: Clear bit after resolve
current->event = 0;
}
if (regs->cs != GDT_USER_CODE_OFFSET) {
regs->gs = GDT_USER_DATA_OFFSET;
regs->fs = GDT_USER_DATA_OFFSET;
regs->es = GDT_USER_DATA_OFFSET;
regs->ds = GDT_USER_DATA_OFFSET;
regs->ss = GDT_USER_DATA_OFFSET;
regs->cs = GDT_USER_CODE_OFFSET;
regs->eflags = EFLAGS_ALWAYS | EFLAGS_INTERRUPTS;
}
/* printf("%d", current->pid); */
}
void proc_print()
{
struct proc *proc = root;
printf("\n");
while (proc) {
printf("Process %d [%s]: %s\n", proc->pid,
proc->state == PROC_RUNNING ? "running" : "sleeping", proc->name);
proc = proc->next;
}
printf("\n");
}
struct proc *proc_current()
{
return current;
}
void proc_attach(struct proc *proc)
{
if (!last->next) {
last->next = proc;
} else {
struct proc *save = last;
while (save->next)
save = save->next;
save->next = proc;
}
}
void proc_exit(int status)
{
printf("Process %d exited with status %d\n", current->pid, status);
current->state = PROC_ASLEEP;
}
struct proc *proc_make()
{
struct proc *proc = malloc(sizeof(*proc));
proc->pid = pid++;
proc->state = PROC_RUNNING;
proc->next = NULL;
if (current)
proc_attach(proc);
last = proc;
return proc;
}
extern void proc_jump_userspace();
u32 _esp, _eip;
void proc_init()
{
cli();
irq_install_handler(0, scheduler);
root = proc_make();
bin_load("/init", root);
proc_print();
_eip = root->regs.eip;
_esp = root->regs.esp;
char *args[] = { "init", (char *)boot_passed->vbe, NULL };
((u32 *)_esp)[0] = 2; // First argument (argc)
((u32 *)_esp)[1] = (u32)args; // Second argument (argv)
proc_jump_userspace();
printf("Returned!\n");
while (1) {
};
}
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