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* 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* 70 archattach(char* spec) 71 { 72 return devattach('P', spec); 73 } 74 75 Walkqid* 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 82 archstat(Chan* c, uchar* dp, int n) 83 { 84 return devstat(c, dp, n, archdir, narchdir, devgen); 85 } 86 87 static Chan* 88 archopen(Chan* c, int omode) 89 { 90 return devopen(c, omode, archdir, narchdir, devgen); 91 } 92 93 static void 94 archclose(Chan*) 95 { 96 } 97 98 static long 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 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 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 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 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 187 archinit(void) 188 { 189 addarchfile("cputype", 0444, cputyperead, nil); 190 addarchfile("timebase",0444, tbread, nil); 191 // addarchfile("nsec", 0444, nsread, nil); 192 } 193