1 #include "u.h"
2 #include "../port/lib.h"
3 #include "mem.h"
4 #include "dat.h"
5 #include "fns.h"
6 #include "../port/error.h"
7 #include "io.h"
8
9 #include "../ip/ip.h"
10
11 enum {
12 Qdir = 0,
13 Qbase,
14
15 Qmax = 16,
16 };
17
18 typedef long Rdwrfn(Chan*, void*, long, vlong);
19
20 static Rdwrfn *readfn[Qmax];
21 static Rdwrfn *writefn[Qmax];
22
23 static Dirtab archdir[Qmax] = {
24 ".", { Qdir, 0, QTDIR }, 0, 0555,
25 };
26
27 Lock archwlock; /* the lock is only for changing archdir */
28 int narchdir = Qbase;
29
30 /*
31 * Add a file to the #P listing. Once added, you can't delete it.
32 * You can't add a file with the same name as one already there,
33 * and you get a pointer to the Dirtab entry so you can do things
34 * like change the Qid version. Changing the Qid path is disallowed.
35 */
36 Dirtab*
addarchfile(char * name,int perm,Rdwrfn * rdfn,Rdwrfn * wrfn)37 addarchfile(char *name, int perm, Rdwrfn *rdfn, Rdwrfn *wrfn)
38 {
39 int i;
40 Dirtab d;
41 Dirtab *dp;
42
43 memset(&d, 0, sizeof d);
44 strcpy(d.name, name);
45 d.perm = perm;
46
47 lock(&archwlock);
48 if(narchdir >= Qmax){
49 unlock(&archwlock);
50 return nil;
51 }
52
53 for(i=0; i<narchdir; i++)
54 if(strcmp(archdir[i].name, name) == 0){
55 unlock(&archwlock);
56 return nil;
57 }
58
59 d.qid.path = narchdir;
60 archdir[narchdir] = d;
61 readfn[narchdir] = rdfn;
62 writefn[narchdir] = wrfn;
63 dp = &archdir[narchdir++];
64 unlock(&archwlock);
65
66 return dp;
67 }
68
69 static Chan*
archattach(char * spec)70 archattach(char* spec)
71 {
72 return devattach('P', spec);
73 }
74
75 Walkqid*
archwalk(Chan * c,Chan * nc,char ** name,int nname)76 archwalk(Chan* c, Chan *nc, char** name, int nname)
77 {
78 return devwalk(c, nc, name, nname, archdir, narchdir, devgen);
79 }
80
81 static int
archstat(Chan * c,uchar * dp,int n)82 archstat(Chan* c, uchar* dp, int n)
83 {
84 return devstat(c, dp, n, archdir, narchdir, devgen);
85 }
86
87 static Chan*
archopen(Chan * c,int omode)88 archopen(Chan* c, int omode)
89 {
90 return devopen(c, omode, archdir, narchdir, devgen);
91 }
92
93 static void
archclose(Chan *)94 archclose(Chan*)
95 {
96 }
97
98 static long
archread(Chan * c,void * a,long n,vlong offset)99 archread(Chan *c, void *a, long n, vlong offset)
100 {
101 Rdwrfn *fn;
102
103 switch((ulong)c->qid.path){
104 case Qdir:
105 return devdirread(c, a, n, archdir, narchdir, devgen);
106
107 default:
108 if(c->qid.path < narchdir && (fn = readfn[c->qid.path]))
109 return fn(c, a, n, offset);
110 error(Eperm);
111 break;
112 }
113
114 return 0;
115 }
116
117 static long
archwrite(Chan * c,void * a,long n,vlong offset)118 archwrite(Chan *c, void *a, long n, vlong offset)
119 {
120 Rdwrfn *fn;
121
122 if(c->qid.path < narchdir && (fn = writefn[c->qid.path]))
123 return fn(c, a, n, offset);
124 error(Eperm);
125
126 return 0;
127 }
128
129 void archinit(void);
130
131 Dev archdevtab = {
132 'P',
133 "arch",
134
135 devreset,
136 archinit,
137 devshutdown,
138 archattach,
139 archwalk,
140 archstat,
141 archopen,
142 devcreate,
143 archclose,
144 archread,
145 devbread,
146 archwrite,
147 devbwrite,
148 devremove,
149 devwstat,
150 };
151
152 static long
cputyperead(Chan *,void * a,long n,vlong offset)153 cputyperead(Chan*, void *a, long n, vlong offset)
154 {
155 char name[64], str[128];
156
157 cputype2name(name, sizeof name);
158 snprint(str, sizeof str, "ARM %s %llud\n", name, m->cpuhz / Mhz);
159 return readstr(offset, a, n, str);
160 }
161
162 static long
tbread(Chan *,void * a,long n,vlong offset)163 tbread(Chan*, void *a, long n, vlong offset)
164 {
165 char str[16];
166 uvlong tb;
167
168 cycles(&tb);
169
170 snprint(str, sizeof(str), "%16.16llux", tb);
171 return readstr(offset, a, n, str);
172 }
173
174 static long
nsread(Chan *,void * a,long n,vlong offset)175 nsread(Chan*, void *a, long n, vlong offset)
176 {
177 char str[16];
178 uvlong tb;
179
180 cycles(&tb);
181
182 snprint(str, sizeof(str), "%16.16llux", (tb/700)* 1000);
183 return readstr(offset, a, n, str);
184 }
185
186 void
archinit(void)187 archinit(void)
188 {
189 addarchfile("cputype", 0444, cputyperead, nil);
190 addarchfile("timebase",0444, tbread, nil);
191 // addarchfile("nsec", 0444, nsread, nil);
192 }
193