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// MIT License, Copyright (c) 2020 Marvin Borner
#ifndef PROC_H
#define PROC_H
#include <def.h>
#include <interrupts.h>
#include <list.h>
#include <stack.h>
#include <sys.h>
#define PROC_QUANTUM 10 // Milliseconds or something // TODO
#define EFLAGS_ALWAYS 0x2 // Always one
#define EFLAGS_INTERRUPTS 0x200 // Enable interrupts
#define GDT_USER_CODE_OFFSET 0x1b // User code segment offset in GDT (with ring3 mask)
#define GDT_USER_DATA_OFFSET 0x23 // User data segment offset in GDT (with ring3 mask)
#define PROC_MAX_WAIT_IDS 16
#define PROC_WAIT_MAGIC 0x00528491
#define STREAM_MAX_SIZE 4096
enum stream_defaults { STREAM_IN, STREAM_OUT, STREAM_ERR, STREAM_LOG, STREAM_UNKNOWN = -1 };
enum proc_state { PROC_RUNNING, PROC_SLEEPING };
enum proc_wait_type { PROC_WAIT_DEV, PROC_WAIT_MSG };
struct proc_wait_identifier {
u32 magic;
u32 id;
enum proc_wait_type type;
u32 func_ptr;
};
struct proc_wait {
struct proc_wait_identifier ids[PROC_MAX_WAIT_IDS];
u32 id_cnt;
};
struct stream {
u32 offset_read;
u32 offset_write;
char data[STREAM_MAX_SIZE];
};
struct proc {
u32 pid;
u32 entry;
u8 super;
char name[32];
struct stream streams[4];
struct regs regs;
struct proc_wait wait; // dev_id
enum proc_state state;
struct stack *messages;
};
void scheduler(struct regs *regs);
void proc_init(void);
void proc_print(void);
struct proc *proc_current(void);
u8 proc_super(void);
struct proc *proc_from_pid(u32 pid);
void proc_exit(struct proc *proc, int status);
void proc_yield(struct regs *r);
void proc_clear_quantum(void);
void proc_enable_waiting(u32 id, enum proc_wait_type type);
void proc_wait_for(u32 id, enum proc_wait_type type, u32 func_ptr);
struct proc *proc_make(void);
#endif
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