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#ifndef SCHEDULER_H
#define SCHEDULER_H
#include "mem.h"
#define MAX_PROC 10
// If you change the following struct
// please consider updating the code in scheduler_asm.S
typedef struct REGISTERS {
u32 eax, ebx, ecx, edx;
u32 cs, eip;
u32 ss, esp, ebp;
u32 esi, edi;
u32 ds, es, fs, gs;
u32 eflags;
u32 ss0, esp0;
} __attribute__((packed)) REGISTERS;
// If you change the following struct
// please consider updating the code in scheduler_asm.S
typedef struct PROC {
u16 id;
u16 pid;
u32* page_dir;
REGISTERS regs;
} __attribute__((packed)) PROC;
extern char show_tics;
extern char scheduler_on;
extern PROC procs[MAX_PROC];
extern u16 current_id; // Current running task PID/id
extern u16 nproc; // Number of active tasks
/**
* Must be called at each clock interrupt
*/
void clock();
/**
* Called by clock() and schedule the next task
* Stack is a pointer pointing to the gs register on the stack.
* The stack must contains the interrupted process registers in the following
* order: gs,fs,es,ds,edi,esi,ebp,UNUSED,edx,ecx,ebx,eax,eip,cs,eflags,esp,ss
*/
void schedule(u32 *stack);
/**
* Create a new task to be schedule
*/
void task_create(void *task, int task_size);
/**
* Stack the scheduler starting by task with PID 0
*/
void scheduler_start();
#endif
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