void
k8_powernow_init(struct cpu_info *ci)
{
uint64_t status;
u_int maxfid, maxvid, i;
u_int32_t extcpuid, dummy;
struct k8pnow_cpu_state *cstate;
struct k8pnow_state *state;
char * techname = NULL;
if (setperf_prio > 1)
return;
cstate = malloc(sizeof(struct k8pnow_cpu_state), M_DEVBUF, M_NOWAIT);
if (!cstate)
return;
cstate->n_states = 0;
status = rdmsr(MSR_AMDK7_FIDVID_STATUS);
maxfid = PN8_STA_MFID(status);
maxvid = PN8_STA_MVID(status);
/*
* If start FID is different to max FID, then it is a
* mobile processor. If not, it is a low powered desktop
* processor.
*/
if (PN8_STA_SFID(status) != PN8_STA_MFID(status))
techname = "PowerNow! K8";
else
techname = "Cool'n'Quiet K8";
#if NACPICPU > 0
/* If we have acpi check acpi first */
if (!k8pnow_acpi_init(cstate, status))
#endif
{
if (!k8pnow_states(cstate, ci->ci_signature, maxfid, maxvid)) {
/* Extended CPUID signature value */
CPUID(0x80000001, extcpuid, dummy, dummy, dummy);
k8pnow_states(cstate, extcpuid, maxfid, maxvid);
}
}
if (cstate->n_states) {
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");
k8pnow_current_state = cstate;
cpu_setperf = k8_powernow_setperf;
setperf_prio = 1;
return;
}
free(cstate, M_DEVBUF, sizeof(*cstate));
}
static int
powernow_init(void)
{
uint64_t status;
size_t len , freq_len;
uint32_t maxfid, maxvid, i;
struct k8pnow_cpu_state *cstate;
struct k8pnow_state *state;
const char *techname;
u_int32_t regs [4];
cpuspeed = 0;
struct sysctl_oid *oid, *leaf;
do_cpuid(0x80000000, regs);
if (regs[0] < 0x80000007)
return 1;
do_cpuid(0x80000007, regs);
if (!(regs[3] & AMD_PN_FID_VID))
return 2;
/* Extended CPUID signature value */
do_cpuid(0x80000001, regs);
cstate = kmalloc(sizeof(struct k8pnow_cpu_state), M_DEVBUF, M_WAITOK);
cstate->n_states = 0;
status = rdmsr(MSR_AMDK7_FIDVID_STATUS);
maxfid = PN8_STA_MFID(status);
maxvid = PN8_STA_MVID(status);
if (PN8_STA_SFID(status) != PN8_STA_MFID(status))
techname = "PowerNow!";
else
techname = "Cool`n'Quiet";
k8pnow_states(cstate, regs[0], maxfid, maxvid);
len = 0;
if (cstate->n_states) {
freq_len = cstate->n_states * (sizeof("9999 ") - 1) + 1;
kprintf("%s speeds:",
techname);
for (i = cstate->n_states; i > 0; i--) {
state = &cstate->state_table[i - 1];
kprintf(" %d", state->freq);
len += ksnprintf(freqs_available + len, freq_len - len, "%d%s",
state->freq,
i > 1 ? " " : "");
}
kprintf(" MHz\n");
k8pnow_current_state = cstate;
k8_powernow_setperf(k8_get_curfreq());
} else {
kfree(cstate, M_DEVBUF);
kprintf("powernow: no power states found\n");
return 3;
}
/*
* Setup the sysctl sub-tree machdep.powernow.*
*/
oid = SYSCTL_ADD_NODE(&machdep_powernow_ctx,
SYSCTL_STATIC_CHILDREN(_machdep), OID_AUTO, "powernow",
CTLFLAG_RD, NULL, "");
if (oid == NULL)
return (EOPNOTSUPP);
oid = SYSCTL_ADD_NODE(&machdep_powernow_ctx, SYSCTL_CHILDREN(oid),
OID_AUTO, "frequency", CTLFLAG_RD, NULL, "");
if (oid == NULL)
return (EOPNOTSUPP);
leaf = SYSCTL_ADD_PROC(&machdep_powernow_ctx, SYSCTL_CHILDREN(oid),
OID_AUTO, "target", CTLTYPE_INT | CTLFLAG_RW, NULL, 0,
powernow_sysctl_helper, "I",
"Target CPU frequency for AMD PowerNow!");
if (leaf == NULL)
return (EOPNOTSUPP);
leaf = SYSCTL_ADD_PROC(&machdep_powernow_ctx, SYSCTL_CHILDREN(oid),
OID_AUTO, "current", CTLTYPE_INT | CTLFLAG_RD, NULL, 0,
powernow_sysctl_helper, "I",
"Current CPU frequency for AMD PowerNow!");
if (leaf == NULL)
return (EOPNOTSUPP);
leaf = SYSCTL_ADD_STRING(&machdep_powernow_ctx, SYSCTL_CHILDREN(oid),
OID_AUTO, "available", CTLFLAG_RD, freqs_available,
sizeof(freqs_available),
"CPU frequencies supported by AMD PowerNow!");
if (leaf == NULL)
return (EOPNOTSUPP);
return (0);
}
