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- #include "u.h"
- #include "../port/lib.h"
- #include "mem.h"
- #include "dat.h"
- #include "fns.h"
- #include "../port/error.h"
- #include "io.h"
- #include "../ip/ip.h"
- enum {
- Qdir = 0,
- Qbase,
- Qmax = 16,
- };
- typedef long Rdwrfn(Chan*, void*, long, vlong);
- static Rdwrfn *readfn[Qmax];
- static Rdwrfn *writefn[Qmax];
- static Dirtab archdir[Qmax] = {
- ".", { Qdir, 0, QTDIR }, 0, 0555,
- };
- Lock archwlock; /* the lock is only for changing archdir */
- int narchdir = Qbase;
- /*
- * Add a file to the #P listing. Once added, you can't delete it.
- * You can't add a file with the same name as one already there,
- * and you get a pointer to the Dirtab entry so you can do things
- * like change the Qid version. Changing the Qid path is disallowed.
- */
- Dirtab*
- addarchfile(char *name, int perm, Rdwrfn *rdfn, Rdwrfn *wrfn)
- {
- int i;
- Dirtab d;
- Dirtab *dp;
- memset(&d, 0, sizeof d);
- strcpy(d.name, name);
- d.perm = perm;
- lock(&archwlock);
- if(narchdir >= Qmax){
- unlock(&archwlock);
- return nil;
- }
- for(i=0; i<narchdir; i++)
- if(strcmp(archdir[i].name, name) == 0){
- unlock(&archwlock);
- return nil;
- }
- d.qid.path = narchdir;
- archdir[narchdir] = d;
- readfn[narchdir] = rdfn;
- writefn[narchdir] = wrfn;
- dp = &archdir[narchdir++];
- unlock(&archwlock);
- return dp;
- }
- static Chan*
- archattach(char* spec)
- {
- return devattach('P', spec);
- }
- Walkqid*
- archwalk(Chan* c, Chan *nc, char** name, int nname)
- {
- return devwalk(c, nc, name, nname, archdir, narchdir, devgen);
- }
- static int
- archstat(Chan* c, uchar* dp, int n)
- {
- return devstat(c, dp, n, archdir, narchdir, devgen);
- }
- static Chan*
- archopen(Chan* c, int omode)
- {
- return devopen(c, omode, archdir, narchdir, devgen);
- }
- static void
- archclose(Chan*)
- {
- }
- static long
- archread(Chan *c, void *a, long n, vlong offset)
- {
- Rdwrfn *fn;
- switch((ulong)c->qid.path){
- case Qdir:
- return devdirread(c, a, n, archdir, narchdir, devgen);
- default:
- if(c->qid.path < narchdir && (fn = readfn[c->qid.path]))
- return fn(c, a, n, offset);
- error(Eperm);
- break;
- }
- return 0;
- }
- static long
- archwrite(Chan *c, void *a, long n, vlong offset)
- {
- Rdwrfn *fn;
- if(c->qid.path < narchdir && (fn = writefn[c->qid.path]))
- return fn(c, a, n, offset);
- error(Eperm);
- return 0;
- }
- void archinit(void);
- Dev archdevtab = {
- 'P',
- "arch",
- devreset,
- archinit,
- devshutdown,
- archattach,
- archwalk,
- archstat,
- archopen,
- devcreate,
- archclose,
- archread,
- devbread,
- archwrite,
- devbwrite,
- devremove,
- devwstat,
- };
- static long
- cputyperead(Chan*, void *a, long n, vlong offset)
- {
- char name[64], str[128];
- cputype2name(name, sizeof name);
- snprint(str, sizeof str, "ARM %s %llud\n", name, m->cpuhz / Mhz);
- return readstr(offset, a, n, str);
- }
- static long
- tbread(Chan*, void *a, long n, vlong offset)
- {
- char str[16];
- uvlong tb;
- cycles(&tb);
- snprint(str, sizeof(str), "%16.16llux", tb);
- return readstr(offset, a, n, str);
- }
- static long
- nsread(Chan*, void *a, long n, vlong offset)
- {
- char str[16];
- uvlong tb;
- cycles(&tb);
- snprint(str, sizeof(str), "%16.16llux", (tb/700)* 1000);
- return readstr(offset, a, n, str);
- }
- void
- archinit(void)
- {
- addarchfile("cputype", 0444, cputyperead, nil);
- addarchfile("timebase",0444, tbread, nil);
- // addarchfile("nsec", 0444, nsread, nil);
- }
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