static int
pn_decode_pst(device_t dev)
{
int maxpst;
struct pn_softc *sc;
u_int cpuid, maxfid, startvid;
u_long sig;
struct psb_header *psb;
uint8_t *p;
u_int regs[4];
uint64_t status;
sc = device_get_softc(dev);
do_cpuid(0x80000001, regs);
cpuid = regs[0];
if ((cpuid & 0xfff) == 0x760)
sc->errata |= A0_ERRATA;
status = rdmsr(MSR_AMDK7_FIDVID_STATUS);
switch (sc->pn_type) {
case PN7_TYPE:
maxfid = PN7_STA_MFID(status);
startvid = PN7_STA_SVID(status);
break;
case PN8_TYPE:
maxfid = PN8_STA_MFID(status);
/*
* we should actually use a variable named 'maxvid' if K8,
* but why introducing a new variable for that?
*/
startvid = PN8_STA_MVID(status);
break;
default:
return (ENODEV);
}
if (bootverbose) {
device_printf(dev, "STATUS: 0x%jx\n", status);
device_printf(dev, "STATUS: maxfid: 0x%02x\n", maxfid);
device_printf(dev, "STATUS: %s: 0x%02x\n",
sc->pn_type == PN7_TYPE ? "startvid" : "maxvid",
startvid);
}
sig = bios_sigsearch(PSB_START, PSB_SIG, PSB_LEN, PSB_STEP, PSB_OFF);
if (sig) {
struct pst_header *pst;
psb = (struct psb_header*)(uintptr_t)BIOS_PADDRTOVADDR(sig);
switch (psb->version) {
default:
return (ENODEV);
case 0x14:
/*
* We can't be picky about numpst since at least
* some systems have a value of 1 and some have 2.
* We trust that cpuid_is_k7() will be better at
* catching that we're on a K8 anyway.
*/
if (sc->pn_type != PN8_TYPE)
return (EINVAL);
sc->vst = psb->settlingtime;
sc->rvo = PN8_PSB_TO_RVO(psb->res1),
sc->irt = PN8_PSB_TO_IRT(psb->res1),
sc->mvs = PN8_PSB_TO_MVS(psb->res1),
sc->low = PN8_PSB_TO_BATT(psb->res1);
if (bootverbose) {
device_printf(dev, "PSB: VST: %d\n",
psb->settlingtime);
device_printf(dev, "PSB: RVO %x IRT %d "
"MVS %d BATT %d\n",
sc->rvo,
sc->irt,
sc->mvs,
sc->low);
}
break;
case 0x12:
if (sc->pn_type != PN7_TYPE)
return (EINVAL);
sc->sgtc = psb->settlingtime * sc->fsb;
if (sc->sgtc < 100 * sc->fsb)
sc->sgtc = 100 * sc->fsb;
break;
}
p = ((uint8_t *) psb) + sizeof(struct psb_header);
pst = (struct pst_header*) p;
maxpst = 200;
do {
struct pst_header *pst = (struct pst_header*) p;
if (cpuid == pst->cpuid &&
maxfid == pst->maxfid &&
startvid == pst->startvid) {
sc->powernow_max_states = pst->numpstates;
switch (sc->pn_type) {
case PN7_TYPE:
if (abs(sc->fsb - pst->fsb) > 5)
continue;
break;
case PN8_TYPE:
break;
}
return (decode_pst(sc,
p + sizeof(struct pst_header),
sc->powernow_max_states));
}
p += sizeof(struct pst_header) + (2 * pst->numpstates);
} while (cpuid_is_k7(pst->cpuid) && maxpst--);
device_printf(dev, "no match for extended cpuid %.3x\n", cpuid);
}
return (ENODEV);
}
void
k7_powernow_init(void)
{
u_int regs[4];
uint64_t status;
u_int maxfid, startvid, currentfid;
struct k7pnow_cpu_state *cstate;
struct k7pnow_state *state;
struct cpu_info *ci;
char *techname = NULL;
int i;
if (setperf_prio > 1)
return;
ci = curcpu();
cpuid(0x80000000, regs);
if (regs[0] < 0x80000007)
return;
cpuid(0x80000007, regs);
if (!(regs[3] & AMD_PN_FID_VID))
return;
/* Extended CPUID signature value */
cpuid(0x80000001, regs);
cstate = malloc(sizeof(struct k7pnow_cpu_state), M_DEVBUF, M_NOWAIT);
if (!cstate)
return;
cstate->flags = cstate->n_states = 0;
if (ci->ci_signature == AMD_ERRATA_A0_CPUSIG)
cstate->flags |= PN7_FLAG_ERRATA_A0;
status = rdmsr(MSR_AMDK7_FIDVID_STATUS);
maxfid = PN7_STA_MFID(status);
startvid = PN7_STA_SVID(status);
currentfid = PN7_STA_CFID(status);
cstate->fsb = cpuspeed / (k7pnow_fid_to_mult[currentfid]/10);
if (!k7pnow_states(cstate, ci->ci_signature, maxfid, startvid))
if (!k7pnow_states(cstate, regs[0], maxfid, startvid)) {
#if NACPICPU > 0
/* If we have it try ACPI */
k7pnow_acpi_init(cstate, status);
#endif
}
if (cstate->n_states) {
if (cstate->flags & PN7_FLAG_DESKTOP_VRM)
techname = "Cool'n'Quiet K7";
else
techname = "PowerNow! K7";
printf("%s: %s %d MHz: speeds:",
ci->ci_dev.dv_xname, techname, cpuspeed);
for (i = cstate->n_states; i > 0; i--) {
state = &cstate->state_table[i-1];
printf(" %d", state->freq);
}
printf(" MHz\n");
k7pnow_current_state = cstate;
cpu_setperf = k7_powernow_setperf;
setperf_prio = 1;
return;
}
free(cstate, M_DEVBUF, sizeof(*cstate));
}