LAB 4 IS DONE.

lab/kern/cpu.h

@@ -0,0 +1,46 @@
+
+#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