Change all references of num_cpus -> num_cores
[akaros.git] / kern / include / ros / procinfo.h
1 /* See COPYRIGHT for copyright information. */
2
3 #ifndef ROS_PROCINFO_H
4 #define ROS_PROCINFO_H
5
6 #include <ros/memlayout.h>
7 #include <ros/common.h>
8 #include <ros/resource.h>
9 #include <ros/atomic.h>
10 #include <ros/arch/arch.h>
11 #include <string.h>
12
13 /* Process creation flags */
14 #define PROC_DUP_FGRP                   1
15
16 #define PROCINFO_MAX_ARGP 32
17 #define PROCINFO_ARGBUF_SIZE 3072
18
19 #ifdef ROS_KERNEL
20 #include <sys/queue.h>
21 #endif /* ROS_KERNEL */
22
23 /* Not necessary to expose all of this, but it doesn't hurt, and is convenient
24  * for the kernel.  Need to do some acrobatics for the TAILQ_ENTRY. */
25 struct vcore;
26 struct vcore {
27 #ifdef ROS_KERNEL
28         TAILQ_ENTRY(vcore)      list;
29 #else /* userspace */
30         void                            *dummy_ptr1;
31         void                            *dummy_ptr2;
32 #endif /* ROS_KERNEL */
33         uint32_t                        pcoreid;
34         bool                            valid;
35         uint32_t                        nr_preempts_sent;       /* these two differ when a preempt*/
36         uint32_t                        nr_preempts_done;       /* is in flight. */
37         uint64_t                        preempt_pending;
38         /* A process can see cumulative runtime as of the last resume, and can also
39          * calculate runtime in this interval, by adding (ns - resume) + total. */
40         uint64_t                        resume_ticks;           /* TSC at resume time */
41         uint64_t                        total_ticks;            /* ticks up to last offlining */
42 };
43
44 struct pcore {
45         uint32_t                        vcoreid;
46         bool                            valid;
47 };
48
49 typedef struct procinfo {
50         pid_t pid;
51         pid_t ppid;
52         size_t max_vcores;      /* TODO: change to a uint32_t */
53         uint64_t tsc_freq;
54         uint64_t timing_overhead;
55         void *heap_bottom;
56         /* glibc relies on stuff above this point.  if you change it, you need to
57          * rebuild glibc. */
58         bool is_mcp;                    /* is in multi mode */
59         unsigned long           res_grant[MAX_NUM_RESOURCES];
60         struct vcore            vcoremap[MAX_NUM_CORES];
61         uint32_t                        num_vcores;
62         struct pcore            pcoremap[MAX_NUM_CORES];
63         seq_ctr_t                       coremap_seqctr;
64 } procinfo_t;
65 #define PROCINFO_NUM_PAGES  ((sizeof(procinfo_t)-1)/PGSIZE + 1) 
66
67
68 // this is how user programs access the procinfo page
69 #ifndef ROS_KERNEL
70 # define __procinfo (*(procinfo_t*)UINFO)
71
72 #include <ros/common.h>
73 #include <ros/atomic.h>
74 #include <ros/syscall.h>
75
76 /* Figure out what your vcoreid is from your pcoreid and procinfo.  Only low
77  * level or debugging code should call this. */
78 static inline uint32_t __get_vcoreid_from_procinfo(void)
79 {
80         /* The assumption is that any IPIs/KMSGs would knock userspace into the
81          * kernel before it could read the closing of the seqctr.  Put another way,
82          * there is a 'memory barrier' between the IPI write and the seqctr write.
83          * I think this is true. */
84         uint32_t kpcoreid, kvcoreid;
85         seq_ctr_t old_seq;
86         do {
87                 cmb();
88                 old_seq = __procinfo.coremap_seqctr;
89                 kpcoreid = __ros_syscall_noerrno(SYS_getpcoreid, 0, 0, 0, 0, 0, 0);
90                 if (!__procinfo.pcoremap[kpcoreid].valid)
91                         continue;
92                 kvcoreid = __procinfo.pcoremap[kpcoreid].vcoreid;
93         } while (seqctr_retry(old_seq, __procinfo.coremap_seqctr));
94         return kvcoreid;
95 }
96
97 static inline uint32_t __get_vcoreid(void)
98 {
99         /* since sys_getvcoreid could lie (and might never change) */
100         return __get_vcoreid_from_procinfo();
101 }
102
103 #endif /* ifndef ROS_KERNEL */
104
105 #endif // !ROS_PROCDATA_H