692 lines
13 KiB
C
692 lines
13 KiB
C
#include <u.h>
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#include <libc.h>
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#include <thread.h>
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#include <draw.h>
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#include "dat.h"
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#include "fns.h"
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char *segname;
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int segrclose;
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Region *mmap;
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int ctlfd, regsfd, mapfd, waitfd;
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Channel *waitch, *sleepch, *notifch;
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enum { MSEC = 1000*1000, MinSleep = MSEC, SleeperPoll = 2000*MSEC } ;
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int getexit, state, debug;
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typedef struct VmxNotif VmxNotif;
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struct VmxNotif {
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void (*f)(void *);
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void *arg;
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};
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int mainstacksize = 65536;
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void *
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emalloc(ulong sz)
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{
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void *v;
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v = malloc(sz);
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if(v == nil)
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sysfatal("malloc: %r");
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memset(v, 0, sz);
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setmalloctag(v, getcallerpc(&sz));
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return v;
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}
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void
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vmerror(char *fmt, ...)
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{
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Fmt f;
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char buf[256];
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va_list arg;
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fmtfdinit(&f, 2, buf, sizeof buf);
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va_start(arg, fmt);
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fmtvprint(&f, fmt, arg);
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va_end(arg);
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fmtprint(&f, "\n");
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fmtfdflush(&f);
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}
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int
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ctl(char *fmt, ...)
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{
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va_list va;
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int rc;
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va_start(va, fmt);
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rc = vfprint(ctlfd, fmt, va);
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va_end(va);
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return rc;
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}
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void
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modregion(Region *r)
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{
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if(r->segname == nil){
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if(fprint(mapfd, "--- wb %#ullx %#ullx\n", (uvlong)r->start, (uvlong)r->end) < 0)
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vmerror("updating memory map: %r");
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}else
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if(fprint(mapfd, "%c%c%c wb %#ullx %#ullx %s %#ullx\n",
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(r->type & REGR) != 0 ? 'r' : '-',
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(r->type & REGW) != 0 ? 'w' : '-',
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(r->type & REGX) != 0 ? 'x' : '-',
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(uvlong)r->start, (uvlong)r->end, r->segname, (uvlong)r->segoff) < 0)
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vmerror("updating memory map: %r");
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}
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static void
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vmxsetup(void)
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{
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static char buf[128];
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static char name[128];
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int rc;
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ctlfd = open("#X/clone", ORDWR|ORCLOSE);
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if(ctlfd < 0) sysfatal("open: %r");
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rc = read(ctlfd, name, sizeof(name) - 1);
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if(rc < 0) sysfatal("read: %r");
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name[rc] = 0;
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if(segname == nil){
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segname = smprint("vm.%s", name);
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segrclose = ORCLOSE;
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}
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snprint(buf, sizeof(buf), "#X/%s/regs", name);
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regsfd = open(buf, ORDWR);
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if(regsfd < 0) sysfatal("open: %r");
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snprint(buf, sizeof(buf), "#X/%s/map", name);
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mapfd = open(buf, OWRITE|OTRUNC);
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if(mapfd < 0) sysfatal("open: %r");
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snprint(buf, sizeof(buf), "#X/%s/wait", name);
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waitfd = open(buf, OREAD);
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if(waitfd < 0) sysfatal("open: %r");
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}
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enum { RCENT = 256 };
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static char *rcname[RCENT];
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static uvlong rcval[RCENT];
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static uvlong rcvalid[(RCENT+63)/64], rcdirty[(RCENT+63)/64];
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static int
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rclookup(char *n)
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{
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int i;
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for(i = 0; i < RCENT; i++)
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if(rcname[i] != nil && strcmp(n, rcname[i]) == 0)
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return i;
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return -1;
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}
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char *
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rcflush(int togo)
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{
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int i, j;
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static char buf[4096];
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char *p, *e;
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uvlong v;
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p = buf;
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e = buf + sizeof(buf);
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*p = 0;
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for(i = 0; i < (RCENT+63)/64; i++){
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if(v = rcdirty[i], v != 0){
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for(j = 0; j < 64; j++)
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if((v>>j & 1) != 0)
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p = seprint(p, e, "%s%c%#ullx%c", rcname[i*64+j], togo?'=':' ', rcval[i*64+j], togo?';':'\n');
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rcdirty[i] = 0;
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}
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rcvalid[i] = 0;
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}
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if(!togo && p != buf && write(regsfd, buf, p - buf) < p - buf)
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sysfatal("rcflush: write: %r");
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return p != buf ? buf : nil;
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}
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static void
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rcload(void)
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{
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static char buf[4096];
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char *p, *q, *f[2];
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int nf;
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int i, rc;
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rcflush(0);
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rc = pread(regsfd, buf, sizeof(buf) - 1, 0);
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if(rc < 0) sysfatal("rcload: pread: %r");
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buf[rc] = 0;
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p = buf;
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for(i = 0; i < nelem(rcname); i++){
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q = strchr(p, '\n');
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if(q == nil) break;
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*q = 0;
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nf = tokenize(p, f, nelem(f));
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p = q + 1;
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if(nf < 2) break;
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rcname[i] = f[0];
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rcval[i] = strtoull(f[1], nil, 0);
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rcvalid[i>>6] |= 1ULL<<(i&63);
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}
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for(; i < nelem(rcname); i++){
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rcname[i] = nil;
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rcvalid[i>>6] &= ~(1ULL<<(i&63));
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}
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}
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uvlong
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rget(char *reg)
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{
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int i;
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i = rclookup(reg);
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if(i < 0 || (rcvalid[i>>6]>>i&1) == 0){
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rcload();
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i = rclookup(reg);
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if(i < 0) sysfatal("unknown register %s", reg);
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}
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return rcval[i];
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}
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void
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rpoke(char *reg, uvlong val, int clean)
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{
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int i;
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i = rclookup(reg);
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if(i >= 0){
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if((rcvalid[i>>6]>>(i&63)&1) != 0 && rcval[i] == val) return;
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goto goti;
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}
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for(i = 0; i < nelem(rcname); i++)
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if(rcname[i] == nil){
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rcname[i] = reg;
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break;
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}
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assert(i < nelem(rcname));
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goti:
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rcval[i] = val;
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rcvalid[i>>6] |= 1ULL<<(i&63);
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if(!clean)
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rcdirty[i>>6] |= 1ULL<<(i&63);
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}
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uvlong
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rgetsz(char *reg, int sz)
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{
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switch(sz){
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case 1: return (u8int)rget(reg);
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case 2: return (u16int)rget(reg);
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case 4: return (u32int)rget(reg);
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case 8: return rget(reg);
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default:
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vmerror("invalid size operand for rgetsz");
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assert(0);
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return 0;
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}
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}
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void
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rsetsz(char *reg, uvlong val, int sz)
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{
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switch(sz){
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case 1: rset(reg, (u8int)val | rget(reg) & ~0xffULL); break;
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case 2: rset(reg, (u16int)val | rget(reg) & ~0xffffULL); break;
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case 4: rset(reg, (u32int)val); break;
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case 8: rset(reg, val); break;
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default:
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vmerror("invalid size operand for rsetsz");
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assert(0);
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}
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}
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Region *
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mkregion(u64int pa, u64int end, int type)
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{
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Region *r, *s, **rp;
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r = emalloc(sizeof(Region));
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if(end < pa) sysfatal("end of region %p before start of region %#p", (void*)end, (void*)pa);
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if((pa & BY2PG-1) != 0 || (end & BY2PG-1) != 0) sysfatal("address %#p not page aligned", (void*)pa);
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r->start = pa;
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r->end = end;
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r->type = type;
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for(s = mmap; s != nil; s = s->next)
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if(!(pa < s->start && end < s->end || pa >= s->start && pa >= s->end))
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sysfatal("region %#p-%#p overlaps region %#p-%#p", (void*)pa, (void*)end, (void*)s->start, (void*)s->end);
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for(rp = &mmap; (*rp) != nil && (*rp)->start < end; rp = &(*rp)->next)
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;
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r->next = *rp;
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*rp = r;
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return r;
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}
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Region *
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regptr(u64int addr)
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{
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Region *r;
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for(r = mmap; r != nil; r = r->next)
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if(addr >= r->start && addr < r->end)
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return r;
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return nil;
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}
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void *
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gptr(u64int addr, u64int len)
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{
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Region *r;
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if(addr + len < addr)
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return nil;
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for(r = mmap; r != nil; r = r->next)
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if(addr >= r->start && addr < r->end){
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if(addr + len > r->end)
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return nil;
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return (uchar *) r->v + (addr - r->start);
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}
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return nil;
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}
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uintptr
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gpa(void *v)
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{
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Region *r;
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for(r = mmap; r != nil; r = r->next)
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if(v >= r->v && v < r->ve)
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return (uchar *) v - (uchar *) r->v + r->start;
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return -1;
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}
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uintptr
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gavail(void *v)
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{
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Region *r;
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for(r = mmap; r != nil; r = r->next)
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if(v >= r->v && v < r->ve)
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return (uchar *) r->ve - (uchar *) v;
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return 0;
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}
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void *
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gend(void *v)
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{
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return (u8int *) v + gavail(v);
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}
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static void
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mksegment(char *sn)
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{
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uintptr sz;
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int fd;
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Region *r;
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char buf[256];
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u8int *gmem, *p;
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sz = BY2PG; /* temporary page */
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sz += 256*1024; /* vga */
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for(r = mmap; r != nil; r = r->next){
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if((r->type & REGALLOC) == 0)
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continue;
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r->segname = sn;
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if(sz + (r->end - r->start) < sz)
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sysfatal("out of address space");
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sz += r->end - r->start;
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}
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gmem = segattach(0, sn, nil, sz);
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if(gmem == (void*)-1){
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snprint(buf, sizeof(buf), "#g/%s", sn);
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fd = create(buf, OREAD|segrclose, DMDIR | 0777);
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if(fd < 0) sysfatal("create: %r");
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snprint(buf, sizeof(buf), "#g/%s/ctl", sn);
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fd = open(buf, OWRITE|OTRUNC);
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if(fd < 0) sysfatal("open: %r");
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snprint(buf, sizeof(buf), "va %#ullx %#ullx sticky", 0x10000000ULL, (uvlong)sz);
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if(write(fd, buf, strlen(buf)) < 0) sysfatal("write: %r");
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close(fd);
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gmem = segattach(0, sn, nil, sz);
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if(gmem == (void*)-1) sysfatal("segattach: %r");
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}else{
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memset(gmem, 0, sz > 1<<24 ? 1<<24 : sz);
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}
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p = gmem;
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for(r = mmap; r != nil; r = r->next){
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if(r->segname == nil) continue;
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r->segoff = p - gmem;
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r->v = p;
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p += r->end - r->start;
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r->ve = p;
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}
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/* vga */
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r = regptr(0xa0000);
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r->segoff = p - gmem;
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r->v = p;
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p += 256*1024;
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r->ve = p;
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for(r = mmap; r != nil; r = r->next)
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modregion(r);
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}
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void
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postexc(char *name, vlong code)
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{
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if(code >= 0){
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if(ctl("exc %s,%#ux", name, (u32int)code) < 0)
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sysfatal("ctl(postexc): %r");
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}else
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if(ctl("exc %s", name) < 0)
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sysfatal("ctl(postexc): %r");
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}
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void
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launch(void)
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{
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char *s;
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s = rcflush(1);
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if(ctl("go %s", s == nil ? "" : s) < 0)
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sysfatal("go %s: %r", s == nil ? "" : s);
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getexit++;
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}
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static void
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waitproc(void *)
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{
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static char buf[512];
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char *p;
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int rc;
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threadsetname("waitexit");
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for(;;){
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rc = read(waitfd, buf, sizeof(buf) - 1);
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if(rc < 0)
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sysfatal("read: %r");
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buf[rc] = 0;
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p = strchr(buf, '\n');
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if(p != nil) *p = 0;
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sendp(waitch, strdup(buf));
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}
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}
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vlong timerevent = -1;
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Lock timerlock;
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int timerid;
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static void
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sleeperproc(void *)
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{
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vlong then, now, dt, adj;
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timerid = threadid();
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timerevent = nanosec() + SleeperPoll;
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unlock(&timerlock);
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threadsetname("sleeper");
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adj = 0;
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for(;;){
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lock(&timerlock);
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then = timerevent;
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now = nanosec();
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if(then <= now) timerevent = now + SleeperPoll;
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unlock(&timerlock);
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if(then > now){
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dt = then - now;
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if(dt+adj >= MinSleep){
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sleep((dt + adj) / MSEC);
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continue;
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}
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adj = dt;
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}
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sendul(sleepch, 0);
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}
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}
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static void
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runloop(void)
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{
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char *waitmsg;
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ulong ul;
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VmxNotif notif;
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lock(&timerlock);
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proccreate(waitproc, nil, 4096);
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proccreate(sleeperproc, nil, 4096);
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launch();
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for(;;){
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enum {
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WAIT,
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SLEEP,
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NOTIF,
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};
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Alt a[] = {
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[WAIT] {waitch, &waitmsg, CHANRCV},
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[SLEEP] {sleepch, &ul, CHANRCV},
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[NOTIF] {notifch, ¬if, CHANRCV},
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{nil, nil, CHANEND}
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};
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switch(alt(a)){
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case WAIT:
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getexit--;
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processexit(waitmsg);
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free(waitmsg);
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break;
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case SLEEP:
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pitadvance();
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rtcadvance();
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break;
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case NOTIF:
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notif.f(notif.arg);
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break;
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}
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if(getexit == 0 && state == VMRUNNING)
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launch();
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}
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}
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static int mainid;
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void
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sendnotif(void (*f)(void *), void *arg)
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{
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VmxNotif notif = {f, arg};
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if(threadid() == mainid)
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f(arg);
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else
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send(notifch, ¬if);
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}
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extern void vgainit(int);
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extern void pciinit(void);
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extern void pcibusmap(void);
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extern void cpuidinit(void);
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extern void vgafbparse(char *);
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extern void init9p(char *);
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int cmdlinen;
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char **cmdlinev;
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int bootmodn;
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char **bootmod;
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static uvlong
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siparse(char *s)
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{
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uvlong l;
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char *p;
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l = strtoull(s, &p, 0);
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switch(*p){
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case 'k': case 'K': p++; l *= 1<<10; break;
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case 'm': case 'M': p++; l *= 1<<20; break;
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case 'g': case 'G': p++; l *= 1<<30; break;
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}
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if(*p != 0) sysfatal("invalid argument: %s", s);
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return l;
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}
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static void
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setiodebug(char *s)
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{
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char *p;
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int n, m, neg;
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extern u32int iodebug[32];
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do{
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if(neg = *s == '!')
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s++;
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n = strtoul(s, &p, 0);
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if(s == p)
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no: sysfatal("invalid iodebug argument (error at %#q)", s);
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if(n >= sizeof(iodebug)*8)
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range: sysfatal("out of iodebug range (0-%#ux)", sizeof(iodebug)*8-1);
|
||
s = p + 1;
|
||
if(*p == '-'){
|
||
m = strtoul(s, &p, 0);
|
||
if(m >= sizeof(iodebug)*8)
|
||
goto range;
|
||
if(s == p || m < n) goto no;
|
||
s = p + 1;
|
||
}else
|
||
m = n;
|
||
for(; n <= m; n++)
|
||
if(neg)
|
||
iodebug[n>>5] &= ~(1<<(n&31));
|
||
else
|
||
iodebug[n>>5] |= 1<<(n&31);
|
||
}while(*p == ',');
|
||
if(*p != 0) goto no;
|
||
}
|
||
|
||
static void
|
||
usage(void)
|
||
{
|
||
char *blanks, *p;
|
||
|
||
blanks = strdup(argv0);
|
||
for(p = blanks; *p != 0; p++)
|
||
*p = ' ';
|
||
fprint(2, "usage: %s [ -M mem ] [ -c com1rd[,com1wr] ] [ -C com2rd[,com2r] ] [ -n nic ]\n", argv0);
|
||
fprint(2, " %s [ -d blockfile ] [ -m module ] [ -v|-w vga ] [ -9 srv ] kernel [ args ... ]\n", blanks);
|
||
threadexitsall("usage");
|
||
}
|
||
|
||
void (*kconfig)(void);
|
||
|
||
void
|
||
threadmain(int argc, char **argv)
|
||
{
|
||
static int (*edev[16])(char *);
|
||
static char *edevt[nelem(edev)];
|
||
static char *edevaux[nelem(edev)];
|
||
static int edevn;
|
||
static uvlong gmemsz = 64*1024*1024;
|
||
static char *srvname;
|
||
extern uintptr fbsz, fbaddr;
|
||
int newwin = 0;
|
||
int i;
|
||
|
||
quotefmtinstall();
|
||
mainid = threadid();
|
||
cpuidinit();
|
||
waitch = chancreate(sizeof(char *), 32);
|
||
sleepch = chancreate(sizeof(ulong), 32);
|
||
notifch = chancreate(sizeof(VmxNotif), 16);
|
||
|
||
ARGBEGIN {
|
||
case 'm':
|
||
bootmod = realloc(bootmod, (bootmodn + 1) * sizeof(char *));
|
||
bootmod[bootmodn++] = strdup(EARGF(usage()));
|
||
break;
|
||
case 's':
|
||
segname = strdup(EARGF(usage()));
|
||
segrclose = 0;
|
||
break;
|
||
case 'c':
|
||
uartinit(0, EARGF(usage()));
|
||
break;
|
||
case 'C':
|
||
uartinit(1, EARGF(usage()));
|
||
break;
|
||
case 'n':
|
||
assert(edevn < nelem(edev));
|
||
edev[edevn] = mkvionet;
|
||
edevt[edevn] = "virtio network";
|
||
edevaux[edevn++] = strdup(EARGF(usage()));
|
||
break;
|
||
case 'd':
|
||
assert(edevn < nelem(edev));
|
||
edevaux[edevn] = strdup(EARGF(usage()));
|
||
if(strncmp(edevaux[edevn], "ide:", 4) == 0){
|
||
edevaux[edevn] += 4;
|
||
edev[edevn] = mkideblk;
|
||
edevt[edevn] = "ide block";
|
||
}else{
|
||
edev[edevn] = mkvioblk;
|
||
edevt[edevn] = "virtio block";
|
||
}
|
||
edevn++;
|
||
break;
|
||
case 'D':
|
||
debug++;
|
||
break;
|
||
case 'M':
|
||
gmemsz = siparse(EARGF(usage()));
|
||
if(gmemsz != (uintptr) gmemsz) sysfatal("too much memory for address space");
|
||
break;
|
||
case 'w':
|
||
newwin = 1;
|
||
case 'v':
|
||
vgafbparse(EARGF(usage()));
|
||
break;
|
||
case '9':
|
||
if(srvname != nil) usage();
|
||
srvname = EARGF(usage());
|
||
break;
|
||
case L'ι':
|
||
setiodebug(EARGF(usage()));
|
||
break;
|
||
default:
|
||
usage();
|
||
} ARGEND;
|
||
if(argc < 1) usage();
|
||
cmdlinen = argc - 1;
|
||
cmdlinev = argv + 1;
|
||
|
||
if(gmemsz < 1<<20) sysfatal("640 KB of RAM is not enough for everyone");
|
||
mkregion(0, 0xa0000, REGALLOC|REGFREE|REGRWX);
|
||
mkregion(0xa0000, 0xc0000, REGALLOC|REGRWX);
|
||
mkregion(0xc0000, 0x100000, REGALLOC|REGRES|REGRWX);
|
||
if(fbsz != 0 && fbaddr < gmemsz){
|
||
mkregion(0x100000, fbaddr, REGALLOC|REGFREE|REGRWX);
|
||
mkregion(fbaddr + fbsz, gmemsz, REGALLOC|REGFREE|REGRWX);
|
||
}else
|
||
mkregion(0x100000, gmemsz, REGALLOC|REGFREE|REGRWX);
|
||
if(fbsz != 0){
|
||
if(fbaddr < 1<<20) sysfatal("framebuffer must not be within first 1 MB");
|
||
if(fbaddr != (u32int) fbaddr || (u32int)(fbaddr+fbsz) < fbaddr) sysfatal("framebuffer must be within first 4 GB");
|
||
mkregion(fbaddr, fbaddr+fbsz, REGALLOC|REGRWX);
|
||
}
|
||
vmxsetup();
|
||
mksegment(segname);
|
||
loadkernel(argv[0]);
|
||
pciinit();
|
||
|
||
vgainit(newwin);
|
||
for(i = 0; i < edevn; i++)
|
||
if(edev[i](edevaux[i]) < 0)
|
||
sysfatal("%s: %r", edevt[i]);
|
||
|
||
pcibusmap();
|
||
|
||
if(srvname != nil) init9p(srvname);
|
||
if(kconfig != nil) kconfig();
|
||
runloop();
|
||
exits(nil);
|
||
}
|