kernel: implement cpu IDs and per-cpu variables

include/socks/cpu.h

@@ -1,13 +1,33 @@
 #ifndef SOCKS_CPU_H_
 #define SOCKS_CPU_H_
 
-#include <socks/bitmap.h>
+#include <socks/machine/cpu.h>
+#include <socks/sched.h>
+
+typedef enum cpu_flags {
+	CPU_ONLINE = 0x01u,
+} cpu_flags_t;
+
+typedef struct cpu_data {
+	cpu_flags_t c_flags;
+	unsigned int c_id;
+
+	task_t *c_current_task;
+	runqueue_t c_rq;
+} cpu_data_t;
 
 /* maximum number of processor cores that the kernel can support.
    TODO move to build config option */
 #define CPU_MAX 128
 
-DECLARE_BITMAP(cpu_available, CPU_MAX);
-DECLARE_BITMAP(cpu_online, CPU_MAX);
+#define this_cpu() (ml_cpu_block_get_id(ml_this_cpu()))
+
+extern cpu_data_t *get_this_cpu(void);
+extern void put_cpu(cpu_data_t *cpu);
+
+extern void cpu_set_available(unsigned int cpu_id);
+extern void cpu_set_online(unsigned int cpu_id);
+
+extern unsigned int cpu_get_highest_available(void);
 
 #endif