jos/kern/cpu.h
Anish Athalye da1f8392b1 Lab 4
2018-10-08 21:32:14 -07:00

47 lines
1.1 KiB
C

#ifndef JOS_INC_CPU_H
#define JOS_INC_CPU_H
#include <inc/types.h>
#include <inc/memlayout.h>
#include <inc/mmu.h>
#include <inc/env.h>
// Maximum number of CPUs
#define NCPU 8
// Values of status in struct Cpu
enum {
CPU_UNUSED = 0,
CPU_STARTED,
CPU_HALTED,
};
// Per-CPU state
struct CpuInfo {
uint8_t cpu_id; // Local APIC ID; index into cpus[] below
volatile unsigned cpu_status; // The status of the CPU
struct Env *cpu_env; // The currently-running environment.
struct Taskstate cpu_ts; // Used by x86 to find stack for interrupt
};
// Initialized in mpconfig.c
extern struct CpuInfo cpus[NCPU];
extern int ncpu; // Total number of CPUs in the system
extern struct CpuInfo *bootcpu; // The boot-strap processor (BSP)
extern physaddr_t lapicaddr; // Physical MMIO address of the local APIC
// Per-CPU kernel stacks
extern unsigned char percpu_kstacks[NCPU][KSTKSIZE];
int cpunum(void);
#define thiscpu (&cpus[cpunum()])
void mp_init(void);
void lapic_init(void);
void lapic_startap(uint8_t apicid, uint32_t addr);
void lapic_eoi(void);
void lapic_ipi(int vector);
#endif