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 /* convert AddrDevid register to a string in buf and return buf */ 153 char * 154 cputype2name(char *buf, int size) 155 { 156 seprint(buf, buf + size, "Cortex-A8"); 157 return buf; 158 } 159 160 static long 161 cputyperead(Chan*, void *a, long n, vlong offset) 162 { 163 char name[64], str[128]; 164 165 cputype2name(name, sizeof name); 166 snprint(str, sizeof str, "ARM %s %llud\n", name, m->cpuhz / Mhz); 167 return readstr(offset, a, n, str); 168 } 169 170 static long 171 tbread(Chan*, void *a, long n, vlong offset) 172 { 173 char str[16]; 174 uvlong tb; 175 176 cycles(&tb); 177 178 snprint(str, sizeof(str), "%16.16llux", tb); 179 return readstr(offset, a, n, str); 180 } 181 182 static long 183 nsread(Chan*, void *a, long n, vlong offset) 184 { 185 char str[16]; 186 uvlong tb; 187 188 cycles(&tb); 189 190 snprint(str, sizeof(str), "%16.16llux", (tb/700)* 1000); 191 return readstr(offset, a, n, str); 192 } 193 194 void 195 archinit(void) 196 { 197 addarchfile("cputype", 0444, cputyperead, nil); 198 addarchfile("timebase",0444, tbread, nil); 199 // addarchfile("nsec", 0444, nsread, nil); 200 } 201