ref: 8bf1e5b77521d94876a58989a434ef1a08d6d509
dir: /sys/src/9/pc/devarch.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "ureg.h"
#include "../port/error.h"
enum {
Qdir = 0,
Qiob,
Qiow,
Qiol,
Qmsr,
Qbase,
Qmax = 32,
};
enum { /* cpuid standard function codes */
Highstdfunc = 0, /* also returns vendor string */
Procsig,
Proctlbcache,
Procserial,
Highextfunc = 0x80000000,
Procextfeat,
};
typedef long Rdwrfn(Chan*, void*, long, vlong);
static Rdwrfn *readfn[Qmax];
static Rdwrfn *writefn[Qmax];
static Dirtab archdir[Qmax] = {
".", { Qdir, 0, QTDIR }, 0, 0555,
"iob", { Qiob, 0 }, 0, 0660,
"iow", { Qiow, 0 }, 0, 0660,
"iol", { Qiol, 0 }, 0, 0660,
"msr", { Qmsr, 0 }, 0, 0660,
};
Lock archwlock; /* the lock is only for changing archdir */
int narchdir = Qbase;
int (*_pcmspecial)(char*, ISAConf*);
void (*_pcmspecialclose)(int);
/*
* 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);
print("addarchfile: out of entries for %s\n", name);
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;
}
void
ioinit(void)
{
char *excluded;
iomapinit(0xffff);
/*
* This is necessary to make the IBM X20 boot.
* Have not tracked down the reason.
* i82557 is at 0x1000, the dummy entry is needed for swappable devs.
*/
ioalloc(0x0fff, 1, 0, "dummy");
if ((excluded = getconf("ioexclude")) != nil) {
char *s;
s = excluded;
while (s && *s != '\0' && *s != '\n') {
char *ends;
int io_s, io_e;
io_s = (int)strtol(s, &ends, 0);
if (ends == nil || ends == s || *ends != '-') {
print("ioinit: cannot parse option string\n");
break;
}
s = ++ends;
io_e = (int)strtol(s, &ends, 0);
if (ends && *ends == ',')
*ends++ = '\0';
s = ends;
ioalloc(io_s, io_e - io_s + 1, 0, "pre-allocated");
}
}
}
static void
checkport(ulong start, ulong end)
{
if(end < start || end > 0x10000)
error(Ebadarg);
/* standard vga regs are OK */
if(start >= 0x2b0 && end <= 0x2df+1)
return;
if(start >= 0x3c0 && end <= 0x3da+1)
return;
if(iounused(start, end))
return;
error(Eperm);
}
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)
{
ulong port, end;
uchar *cp;
ushort *sp;
ulong *lp;
vlong *vp;
Rdwrfn *fn;
port = offset;
end = port+n;
switch((ulong)c->qid.path){
case Qdir:
return devdirread(c, a, n, archdir, narchdir, devgen);
case Qiob:
checkport(port, end);
for(cp = a; port < end; port++)
*cp++ = inb(port);
return n;
case Qiow:
if(n & 1)
error(Ebadarg);
checkport(port, end);
for(sp = a; port < end; port += 2)
*sp++ = ins(port);
return n;
case Qiol:
if(n & 3)
error(Ebadarg);
checkport(port, end);
for(lp = a; port < end; port += 4)
*lp++ = inl(port);
return n;
case Qmsr:
if(n & 7)
error(Ebadarg);
if((ulong)n/8 > -port)
error(Ebadarg);
end = port+(n/8);
for(vp = a; port != end; port++)
if(rdmsr(port, vp++) < 0)
error(Ebadarg);
return n;
default:
if(c->qid.path < narchdir && (fn = readfn[c->qid.path]))
return fn(c, a, n, offset);
error(Eperm);
return 0;
}
}
static long
archwrite(Chan *c, void *a, long n, vlong offset)
{
ulong port, end;
uchar *cp;
ushort *sp;
ulong *lp;
vlong *vp;
Rdwrfn *fn;
port = offset;
end = port+n;
switch((ulong)c->qid.path){
case Qiob:
checkport(port, end);
for(cp = a; port < end; port++)
outb(port, *cp++);
return n;
case Qiow:
if(n & 1)
error(Ebadarg);
checkport(port, end);
for(sp = a; port < end; port += 2)
outs(port, *sp++);
return n;
case Qiol:
if(n & 3)
error(Ebadarg);
checkport(port, end);
for(lp = a; port < end; port += 4)
outl(port, *lp++);
return n;
case Qmsr:
if(n & 7)
error(Ebadarg);
if((ulong)n/8 > -port)
error(Ebadarg);
end = port+(n/8);
for(vp = a; port != end; port++)
if(wrmsr(port, *vp++) < 0)
error(Ebadarg);
return n;
default:
if(c->qid.path < narchdir && (fn = writefn[c->qid.path]) != nil)
return fn(c, a, n, offset);
error(Eperm);
break;
}
return 0;
}
Dev archdevtab = {
'P',
"arch",
devreset,
devinit,
devshutdown,
archattach,
archwalk,
archstat,
archopen,
devcreate,
archclose,
archread,
devbread,
archwrite,
devbwrite,
devremove,
devwstat,
};
/*
* the following is a generic version of the
* architecture specific stuff
*/
static int
unimplemented(int)
{
return 0;
}
static void
nop(void)
{
}
/*
* 386 has no compare-and-swap instruction.
* Run it with interrupts turned off instead.
*/
static int
cmpswap386(long *addr, long old, long new)
{
int r, s;
s = splhi();
if(r = (*addr == old))
*addr = new;
splx(s);
return r;
}
/*
* On a uniprocessor, you'd think that coherence could be nop,
* but it can't. We still need a barrier when using coherence() in
* device drivers.
*
* On VMware, it's safe (and a huge win) to set this to nop.
* Aux/vmware does this via the #P/archctl file.
*/
void (*coherence)(void) = nop;
int (*cmpswap)(long*, long, long) = cmpswap386;
PCArch* arch;
extern PCArch* knownarch[];
typedef struct X86type X86type;
struct X86type {
int family;
int model;
int aalcycles;
char* name;
};
static X86type x86intel[] =
{
{ 4, 0, 22, "486DX", }, /* known chips */
{ 4, 1, 22, "486DX50", },
{ 4, 2, 22, "486SX", },
{ 4, 3, 22, "486DX2", },
{ 4, 4, 22, "486SL", },
{ 4, 5, 22, "486SX2", },
{ 4, 7, 22, "DX2WB", }, /* P24D */
{ 4, 8, 22, "DX4", }, /* P24C */
{ 4, 9, 22, "DX4WB", }, /* P24CT */
{ 5, 0, 23, "P5", },
{ 5, 1, 23, "P5", },
{ 5, 2, 23, "P54C", },
{ 5, 3, 23, "P24T", },
{ 5, 4, 23, "P55C MMX", },
{ 5, 7, 23, "P54C VRT", },
{ 6, 1, 16, "PentiumPro", },/* trial and error */
{ 6, 3, 16, "PentiumII", },
{ 6, 5, 16, "PentiumII/Xeon", },
{ 6, 6, 16, "Celeron", },
{ 6, 7, 16, "PentiumIII/Xeon", },
{ 6, 8, 16, "PentiumIII/Xeon", },
{ 6, 0xB, 16, "PentiumIII/Xeon", },
{ 6, 0xF, 16, "Xeon5000-series", },
{ 6, 0x16, 16, "Celeron", },
{ 6, 0x17, 16, "Core 2/Xeon", },
{ 6, 0x1A, 16, "Core i7/Xeon", },
{ 6, 0x1C, 16, "Atom", },
{ 6, 0x1D, 16, "Xeon MP", },
{ 0xF, 1, 16, "P4", }, /* P4 */
{ 0xF, 2, 16, "PentiumIV/Xeon", },
{ 0xF, 6, 16, "PentiumIV/Xeon", },
{ 3, -1, 32, "386", }, /* family defaults */
{ 4, -1, 22, "486", },
{ 5, -1, 23, "P5", },
{ 6, -1, 16, "P6", },
{ 0xF, -1, 16, "P4", }, /* P4 */
{ -1, -1, 16, "unknown", }, /* total default */
};
/*
* The AMD processors all implement the CPUID instruction.
* The later ones also return the processor name via functions
* 0x80000002, 0x80000003 and 0x80000004 in registers AX, BX, CX
* and DX:
* K5 "AMD-K5(tm) Processor"
* K6 "AMD-K6tm w/ multimedia extensions"
* K6 3D "AMD-K6(tm) 3D processor"
* K6 3D+ ?
*/
static X86type x86amd[] =
{
{ 5, 0, 23, "AMD-K5", }, /* guesswork */
{ 5, 1, 23, "AMD-K5", }, /* guesswork */
{ 5, 2, 23, "AMD-K5", }, /* guesswork */
{ 5, 3, 23, "AMD-K5", }, /* guesswork */
{ 5, 4, 23, "AMD Geode GX1", }, /* guesswork */
{ 5, 5, 23, "AMD Geode GX2", }, /* guesswork */
{ 5, 6, 11, "AMD-K6", }, /* trial and error */
{ 5, 7, 11, "AMD-K6", }, /* trial and error */
{ 5, 8, 11, "AMD-K6-2", }, /* trial and error */
{ 5, 9, 11, "AMD-K6-III", },/* trial and error */
{ 5, 0xa, 23, "AMD Geode LX", }, /* guesswork */
{ 6, 1, 11, "AMD-Athlon", },/* trial and error */
{ 6, 2, 11, "AMD-Athlon", },/* trial and error */
{ 0x1F, 9, 11, "AMD-K10 Opteron G34", },/* guesswork */
{ 4, -1, 22, "Am486", }, /* guesswork */
{ 5, -1, 23, "AMD-K5/K6", }, /* guesswork */
{ 6, -1, 11, "AMD-Athlon", },/* guesswork */
{ 0xF, -1, 11, "AMD-K8", }, /* guesswork */
{ 0x1F, -1, 11, "AMD-K10", }, /* guesswork */
{ 23, 1, 13, "AMD Ryzen" },
{ -1, -1, 11, "unknown", }, /* total default */
};
/*
* WinChip 240MHz
*/
static X86type x86winchip[] =
{
{5, 4, 23, "Winchip",}, /* guesswork */
{6, 7, 23, "Via C3 Samuel 2 or Ezra",},
{6, 8, 23, "Via C3 Ezra-T",},
{6, 9, 23, "Via C3 Eden-N",},
{6, 0xd, 23, "Via C7 Eden",},
{ -1, -1, 23, "unknown", }, /* total default */
};
/*
* SiS 55x
*/
static X86type x86sis[] =
{
{5, 0, 23, "SiS 55x",}, /* guesswork */
{ -1, -1, 23, "unknown", }, /* total default */
};
static void simplecycles(uvlong*);
void (*cycles)(uvlong*) = simplecycles;
void _cycles(uvlong*); /* in l.s */
static void
simplecycles(uvlong*x)
{
*x = m->ticks;
}
void
cpuidprint(void)
{
print("cpu%d: %dMHz %s %s (AX %8.8uX CX %8.8uX DX %8.8uX)\n",
m->machno, m->cpumhz, m->cpuidid, m->cpuidtype,
m->cpuidax, m->cpuidcx, m->cpuiddx);
}
/*
* figure out:
* - cpu type
* - whether or not we have a TSC (cycle counter)
* - whether or not it supports page size extensions
* (if so turn it on)
* - whether or not it supports machine check exceptions
* (if so turn it on)
* - whether or not it supports the page global flag
* (if so turn it on)
* - detect PAT feature and add write-combining entry
* - detect MTRR support and synchronize state with cpu0
* - detect NX support and enable it for AMD64
* - detect watchpoint support
* - detect FPU features and enable the FPU
*/
int
cpuidentify(void)
{
int family, model;
X86type *t, *tab;
ulong regs[4];
uintptr cr4;
cpuid(Highstdfunc, 0, regs);
memmove(m->cpuidid, ®s[1], BY2WD); /* bx */
memmove(m->cpuidid+4, ®s[3], BY2WD); /* dx */
memmove(m->cpuidid+8, ®s[2], BY2WD); /* cx */
m->cpuidid[12] = '\0';
cpuid(Procsig, 0, regs);
m->cpuidax = regs[0];
m->cpuidcx = regs[2];
m->cpuiddx = regs[3];
m->cpuidfamily = m->cpuidax >> 8 & 0xf;
m->cpuidmodel = m->cpuidax >> 4 & 0xf;
m->cpuidstepping = m->cpuidax & 0xf;
switch(m->cpuidfamily){
case 15:
m->cpuidfamily += m->cpuidax >> 20 & 0xff;
m->cpuidmodel += m->cpuidax >> 16 & 0xf;
break;
case 6:
m->cpuidmodel += m->cpuidax >> 16 & 0xf;
break;
}
if(strncmp(m->cpuidid, "AuthenticAMD", 12) == 0 ||
strncmp(m->cpuidid, "Geode by NSC", 12) == 0)
tab = x86amd;
else if(strncmp(m->cpuidid, "CentaurHauls", 12) == 0)
tab = x86winchip;
else if(strncmp(m->cpuidid, "SiS SiS SiS ", 12) == 0)
tab = x86sis;
else
tab = x86intel;
family = m->cpuidfamily;
model = m->cpuidmodel;
for(t=tab; t->name; t++)
if((t->family == family && t->model == model)
|| (t->family == family && t->model == -1)
|| (t->family == -1))
break;
m->aalcycles = t->aalcycles;
m->cpuidtype = t->name;
/*
* if there is one, set tsc to a known value
*/
if(m->cpuiddx & Tsc){
m->havetsc = 1;
cycles = _cycles;
if(m->cpuiddx & Cpumsr)
wrmsr(0x10, 0);
}
/*
* If machine check exception, page size extensions or page global bit
* are supported enable them in CR4 and clear any other set extensions.
* If machine check was enabled clear out any lingering status.
*/
if(m->cpuiddx & (Pge|Mce|Pse)){
vlong mca, mct;
cr4 = getcr4();
if(m->cpuiddx & Pse)
cr4 |= 0x10; /* page size extensions */
if((m->cpuiddx & Mce) != 0 && getconf("*nomce") == nil){
if((m->cpuiddx & Mca) != 0){
vlong cap;
int bank;
cap = 0;
rdmsr(0x179, &cap);
if(cap & 0x100)
wrmsr(0x17B, ~0ULL); /* enable all mca features */
bank = cap & 0xFF;
if(bank > 64)
bank = 64;
/* init MCi .. MC1 (except MC0) */
while(--bank > 0){
wrmsr(0x400 + bank*4, ~0ULL);
wrmsr(0x401 + bank*4, 0);
}
if(family != 6 || model >= 0x1A)
wrmsr(0x400, ~0ULL);
wrmsr(0x401, 0);
}
else if(family == 5){
rdmsr(0x00, &mca);
rdmsr(0x01, &mct);
}
cr4 |= 0x40; /* machine check enable */
}
/*
* Detect whether the chip supports the global bit
* in page directory and page table entries. When set
* in a particular entry, it means ``don't bother removing
* this from the TLB when CR3 changes.''
*
* We flag all kernel pages with this bit. Doing so lessens the
* overhead of switching processes on bare hardware,
* even more so on VMware. See mmu.c:/^memglobal.
*
* For future reference, should we ever need to do a
* full TLB flush, it can be accomplished by clearing
* the PGE bit in CR4, writing to CR3, and then
* restoring the PGE bit.
*/
if(m->cpuiddx & Pge){
cr4 |= 0x80; /* page global enable bit */
m->havepge = 1;
}
putcr4(cr4);
if((m->cpuiddx & (Mca|Mce)) == Mce)
rdmsr(0x01, &mct);
}
#ifdef PATWC
/* IA32_PAT write combining */
if((m->cpuiddx & Pat) != 0){
vlong pat;
if(rdmsr(0x277, &pat) != -1){
pat &= ~(255LL<<(PATWC*8));
pat |= 1LL<<(PATWC*8); /* WC */
wrmsr(0x277, pat);
}
}
#endif
if((m->cpuiddx & Mtrr) != 0 && getconf("*nomtrr") == nil)
mtrrsync();
if(strcmp(m->cpuidid, "GenuineIntel") == 0 && (m->cpuidcx & Rdrnd) != 0)
hwrandbuf = rdrandbuf;
else
hwrandbuf = nil;
if(sizeof(uintptr) == 8) {
/* 8-byte watchpoints are supported in Long Mode */
m->havewatchpt8 = 1;
/* check and enable NX bit */
cpuid(Highextfunc, 0, regs);
if(regs[0] >= Procextfeat){
cpuid(Procextfeat, 0, regs);
if((regs[3] & (1<<20)) != 0){
vlong efer;
/* enable no-execute feature */
if(rdmsr(Efer, &efer) != -1){
efer |= 1ull<<11;
if(wrmsr(Efer, efer) != -1)
m->havenx = 1;
}
}
}
} else if(strcmp(m->cpuidid, "GenuineIntel") == 0){
/* some random CPUs that support 8-byte watchpoints */
if(family == 15 && (model == 3 || model == 4 || model == 6)
|| family == 6 && (model == 15 || model == 23 || model == 28))
m->havewatchpt8 = 1;
/* Intel SDM claims amd64 support implies 8-byte watchpoint support */
cpuid(Highextfunc, 0, regs);
if(regs[0] >= Procextfeat){
cpuid(Procextfeat, 0, regs);
if((regs[3] & 1<<29) != 0)
m->havewatchpt8 = 1;
}
}
fpuinit();
return t->family;
}
static long
cputyperead(Chan*, void *a, long n, vlong offset)
{
char str[32];
snprint(str, sizeof(str), "%s %d\n", m->cpuidtype, m->cpumhz);
return readstr(offset, a, n, str);
}
static long
archctlread(Chan*, void *a, long nn, vlong offset)
{
int n;
char *buf, *p, *ep;
p = buf = smalloc(READSTR);
ep = p + READSTR;
p = seprint(p, ep, "cpu %s %d%s\n",
m->cpuidtype, m->cpumhz, m->havepge ? " pge" : "");
p = seprint(p, ep, "pge %s\n", getcr4()&0x80 ? "on" : "off");
p = seprint(p, ep, "coherence ");
if(coherence == mb386)
p = seprint(p, ep, "mb386\n");
else if(coherence == mb586)
p = seprint(p, ep, "mb586\n");
else if(coherence == mfence)
p = seprint(p, ep, "mfence\n");
else if(coherence == nop)
p = seprint(p, ep, "nop\n");
else
p = seprint(p, ep, "0x%p\n", coherence);
p = seprint(p, ep, "cmpswap ");
if(cmpswap == cmpswap386)
p = seprint(p, ep, "cmpswap386\n");
else if(cmpswap == cmpswap486)
p = seprint(p, ep, "cmpswap486\n");
else
p = seprint(p, ep, "0x%p\n", cmpswap);
p = seprint(p, ep, "arch %s\n", arch->id);
n = p - buf;
n += mtrrprint(p, ep - p);
buf[n] = '\0';
n = readstr(offset, a, nn, buf);
free(buf);
return n;
}
enum
{
CMpge,
CMcoherence,
CMcache,
};
static Cmdtab archctlmsg[] =
{
CMpge, "pge", 2,
CMcoherence, "coherence", 2,
CMcache, "cache", 4,
};
static long
archctlwrite(Chan*, void *a, long n, vlong)
{
uvlong base, size;
Cmdbuf *cb;
Cmdtab *ct;
char *ep;
cb = parsecmd(a, n);
if(waserror()){
free(cb);
nexterror();
}
ct = lookupcmd(cb, archctlmsg, nelem(archctlmsg));
switch(ct->index){
case CMpge:
if(!m->havepge)
error("processor does not support pge");
if(strcmp(cb->f[1], "on") == 0)
putcr4(getcr4() | 0x80);
else if(strcmp(cb->f[1], "off") == 0)
putcr4(getcr4() & ~0x80);
else
cmderror(cb, "invalid pge ctl");
break;
case CMcoherence:
if(strcmp(cb->f[1], "mb386") == 0)
coherence = mb386;
else if(strcmp(cb->f[1], "mb586") == 0){
if(m->cpuidfamily < 5)
error("invalid coherence ctl on this cpu family");
coherence = mb586;
}else if(strcmp(cb->f[1], "mfence") == 0){
if((m->cpuiddx & Sse2) == 0)
error("invalid coherence ctl on this cpu family");
coherence = mfence;
}else if(strcmp(cb->f[1], "nop") == 0){
/* only safe on vmware */
if(conf.nmach > 1)
error("cannot disable coherence on a multiprocessor");
coherence = nop;
}else
cmderror(cb, "invalid coherence ctl");
break;
case CMcache:
base = strtoull(cb->f[1], &ep, 0);
if(*ep)
error("cache: parse error: base not a number?");
size = strtoull(cb->f[2], &ep, 0);
if(*ep)
error("cache: parse error: size not a number?");
ep = mtrr(base, size, cb->f[3]);
if(ep != nil)
error(ep);
break;
}
free(cb);
poperror();
return n;
}
static long
rmemrw(int isr, void *a, long n, vlong off)
{
uintptr addr = off;
if(off < 0 || n < 0)
error("bad offset/count");
if(isr){
if(addr >= MB)
return 0;
if(addr+n > MB)
n = MB - addr;
memmove(a, KADDR(addr), n);
}else{
/* allow vga framebuf's write access */
if(addr >= MB || addr+n > MB ||
(addr < 0xA0000 || addr+n > 0xB0000+0x10000))
error("bad offset/count in write");
memmove(KADDR(addr), a, n);
}
return n;
}
static long
rmemread(Chan*, void *a, long n, vlong off)
{
return rmemrw(1, a, n, off);
}
static long
rmemwrite(Chan*, void *a, long n, vlong off)
{
return rmemrw(0, a, n, off);
}
void
archinit(void)
{
PCArch **p;
arch = knownarch[0];
for(p = knownarch; *p != nil; p++){
if((*p)->ident != nil && (*p)->ident() == 0){
arch = *p;
break;
}
}
if(arch != knownarch[0]){
if(arch->id == nil)
arch->id = knownarch[0]->id;
if(arch->reset == nil)
arch->reset = knownarch[0]->reset;
if(arch->intrinit == nil)
arch->intrinit = knownarch[0]->intrinit;
if(arch->intrassign == nil)
arch->intrassign = knownarch[0]->intrassign;
if(arch->clockinit == nil)
arch->clockinit = knownarch[0]->clockinit;
}
/*
* Decide whether to use copy-on-reference (386 and mp).
* We get another chance to set it in mpinit() for a
* multiprocessor.
*/
if(m->cpuidfamily == 3)
conf.copymode = 1;
if(m->cpuidfamily >= 4)
cmpswap = cmpswap486;
if(m->cpuidfamily >= 5)
coherence = mb586;
if(m->cpuiddx & Sse2)
coherence = mfence;
addarchfile("cputype", 0444, cputyperead, nil);
addarchfile("archctl", 0664, archctlread, archctlwrite);
addarchfile("realmodemem", 0660, rmemread, rmemwrite);
}
/*
* call either the pcmcia or pccard device setup
*/
int
pcmspecial(char *idstr, ISAConf *isa)
{
return (_pcmspecial != nil)? _pcmspecial(idstr, isa): -1;
}
/*
* call either the pcmcia or pccard device teardown
*/
void
pcmspecialclose(int a)
{
if (_pcmspecialclose != nil)
_pcmspecialclose(a);
}
/*
* return value and speed of timer set in arch->clockenable
*/
uvlong
fastticks(uvlong *hz)
{
return (*arch->fastclock)(hz);
}
ulong
µs(void)
{
return fastticks2us((*arch->fastclock)(nil));
}
/*
* set next timer interrupt
*/
void
timerset(Tval x)
{
(*arch->timerset)(x);
}
/*
* put the processor in the halt state if we've no processes to run.
* an interrupt will get us going again.
*
* halting in an smp system can result in a startup latency for
* processes that become ready.
* if idle_spin is zero, we care more about saving energy
* than reducing this latency.
*
* the performance loss with idle_spin == 0 seems to be slight
* and it reduces lock contention (thus system time and real time)
* on many-core systems with large values of NPROC.
*/
void
idlehands(void)
{
extern int nrdy, idle_spin;
if(conf.nmach == 1)
halt();
else if(m->cpuidcx & Monitor)
mwait(&nrdy);
else if(idle_spin == 0)
halt();
}
int
isaconfig(char *class, int ctlrno, ISAConf *isa)
{
char cc[32], *p, *x;
int i;
snprint(cc, sizeof cc, "%s%d", class, ctlrno);
p = getconf(cc);
if(p == nil)
return 0;
x = nil;
kstrdup(&x, p);
p = x;
isa->type = "";
isa->nopt = tokenize(p, isa->opt, NISAOPT);
for(i = 0; i < isa->nopt; i++){
p = isa->opt[i];
if(cistrncmp(p, "type=", 5) == 0)
isa->type = p + 5;
else if(cistrncmp(p, "port=", 5) == 0)
isa->port = strtoull(p+5, &p, 0);
else if(cistrncmp(p, "irq=", 4) == 0)
isa->irq = strtoul(p+4, &p, 0);
else if(cistrncmp(p, "dma=", 4) == 0)
isa->dma = strtoul(p+4, &p, 0);
else if(cistrncmp(p, "mem=", 4) == 0)
isa->mem = strtoul(p+4, &p, 0);
else if(cistrncmp(p, "size=", 5) == 0)
isa->size = strtoul(p+5, &p, 0);
else if(cistrncmp(p, "freq=", 5) == 0)
isa->freq = strtoul(p+5, &p, 0);
}
return 1;
}
void
dumpmcregs(void)
{
vlong v, w;
int bank;
if((m->cpuiddx & (Mce|Cpumsr)) != (Mce|Cpumsr))
return;
if((m->cpuiddx & Mca) == 0){
rdmsr(0x00, &v);
rdmsr(0x01, &w);
iprint("MCA %8.8llux MCT %8.8llux\n", v, w);
return;
}
rdmsr(0x179, &v);
rdmsr(0x17A, &w);
iprint("MCG CAP %.16llux STATUS %.16llux\n", v, w);
bank = v & 0xFF;
if(bank > 64)
bank = 64;
while(--bank >= 0){
rdmsr(0x401 + bank*4, &v);
if((v & (1ull << 63)) == 0)
continue;
iprint("MC%d STATUS %.16llux", bank, v);
if(v & (1ull << 58)){
rdmsr(0x402 + bank*4, &w);
iprint(" ADDR %.16llux", w);
}
if(v & (1ull << 59)){
rdmsr(0x403 + bank*4, &w);
iprint(" MISC %.16llux", w);
}
iprint("\n");
}
}
static void
nmihandler(Ureg *ureg, void*)
{
iprint("cpu%d: nmi PC %#p, status %ux\n",
m->machno, ureg->pc, inb(0x61));
while(m->machno != 0)
;
}
void
nmienable(void)
{
int x;
trapenable(VectorNMI, nmihandler, nil, "nmi");
/*
* Hack: should be locked with NVRAM access.
*/
outb(0x70, 0x80); /* NMI latch clear */
outb(0x70, 0);
x = inb(0x61) & 0x07; /* Enable NMI */
outb(0x61, 0x0C|x);
outb(0x61, x);
}
void
setupwatchpts(Proc *pr, Watchpt *wp, int nwp)
{
int i;
u8int cfg;
Watchpt *p;
if(nwp > 4)
error("there are four watchpoints.");
if(nwp == 0){
memset(pr->dr, 0, sizeof(pr->dr));
return;
}
for(p = wp; p < wp + nwp; p++){
switch(p->type){
case WATCHRD|WATCHWR: case WATCHWR:
break;
case WATCHEX:
if(p->len != 1)
error("length must be 1 on breakpoints");
break;
default:
error("type must be rw-, -w- or --x");
}
switch(p->len){
case 1: case 2: case 4:
break;
case 8:
if(m->havewatchpt8) break;
default:
error(m->havewatchpt8 ? "length must be 1,2,4,8" : "length must be 1,2,4");
}
if((p->addr & p->len - 1) != 0)
error("address must be aligned according to length");
}
memset(pr->dr, 0, sizeof(pr->dr));
pr->dr[6] = 0xffff8ff0;
for(i = 0; i < nwp; i++){
pr->dr[i] = wp[i].addr;
switch(wp[i].type){
case WATCHRD|WATCHWR: cfg = 3; break;
case WATCHWR: cfg = 1; break;
case WATCHEX: cfg = 0; break;
default: continue;
}
switch(wp[i].len){
case 1: break;
case 2: cfg |= 4; break;
case 4: cfg |= 12; break;
case 8: cfg |= 8; break;
default: continue;
}
pr->dr[7] |= cfg << 16 + 4 * i;
pr->dr[7] |= 1 << 2 * i + 1;
}
}