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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 42 // Milliseconds or something // TODO
#define PROC_STACK_SIZE (1 << 20) // 1MiB
#define EFLAGS_ALWAYS 0x2 // Always one
#define EFLAGS_INTERRUPTS 0x200 // Enable interrupts
#define GDT_SUPER_CODE_OFFSET 0x08 // Super (kernel) code segment offset in GDT
#define GDT_SUPER_DATA_OFFSET 0x10 // Super (kernel) data segment offset in GDT
#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 RING(regs) ((regs->cs) & 3)
#define STREAM_MAX_SIZE 4096
enum stream_defaults { STREAM_IN, STREAM_OUT, STREAM_ERR, STREAM_LOG, STREAM_UNKNOWN = -1 };
enum proc_priv { PROC_PRIV_NONE, PROC_PRIV_ROOT, PROC_PRIV_KERNEL };
enum proc_state { PROC_RUNNING, PROC_BLOCKED };
struct stream {
u32 offset_read;
u32 offset_write;
char data[STREAM_MAX_SIZE];
};
struct proc {
u32 pid;
u32 entry;
char name[64];
char dir[64];
struct stream streams[4];
struct page_dir *page_dir;
struct regs regs;
enum proc_priv priv;
enum proc_state state;
struct stack *messages;
struct list *memory;
u32 bus_conn;
struct {
u32 user;
u32 kernel;
} stack;
struct {
u32 user;
u32 kernel;
} ticks;
struct {
u8 val;
u8 cnt;
} quantum;
};
void scheduler(struct regs *regs) NONNULL;
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, struct regs *r, s32 status) NONNULL;
void proc_yield(void);
void proc_set_quantum(struct proc *proc, u32 value);
void proc_reset_quantum(struct proc *proc);
void proc_state(struct proc *proc, enum proc_state state);
struct proc *proc_make(enum proc_priv priv);
void proc_stack_push(struct proc *proc, u32 data) NONNULL;
#endif
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