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-rw-r--r--sys/i386/cpufreq/smist.c514
1 files changed, 0 insertions, 514 deletions
diff --git a/sys/i386/cpufreq/smist.c b/sys/i386/cpufreq/smist.c
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--- a/sys/i386/cpufreq/smist.c
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-/*-
- * Copyright (c) 2005 Bruno Ducrot
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-/*
- * This driver is based upon information found by examining speedstep-0.5
- * from Marc Lehman, which includes all the reverse engineering effort of
- * Malik Martin (function 1 and 2 of the GSI).
- *
- * The correct way for the OS to take ownership from the BIOS was found by
- * Hiroshi Miura (function 0 of the GSI).
- *
- * Finally, the int 15h call interface was (partially) documented by Intel.
- *
- * Many thanks to Jon Noack for testing and debugging this driver.
- */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include <sys/param.h>
-#include <sys/bus.h>
-#include <sys/cpu.h>
-#include <sys/kernel.h>
-#include <sys/module.h>
-#include <sys/systm.h>
-
-#include <machine/bus.h>
-#include <machine/cputypes.h>
-#include <machine/md_var.h>
-#include <machine/vm86.h>
-
-#include <dev/pci/pcivar.h>
-#include <dev/pci/pcireg.h>
-
-#include <vm/vm.h>
-#include <vm/pmap.h>
-
-#include "cpufreq_if.h"
-
-#if 0
-#define DPRINT(dev, x...) device_printf(dev, x)
-#else
-#define DPRINT(dev, x...)
-#endif
-
-struct smist_softc {
- device_t dev;
- int smi_cmd;
- int smi_data;
- int command;
- int flags;
- struct cf_setting sets[2]; /* Only two settings. */
-};
-
-static char smist_magic[] = "Copyright (c) 1999 Intel Corporation";
-
-static void smist_identify(driver_t *driver, device_t parent);
-static int smist_probe(device_t dev);
-static int smist_attach(device_t dev);
-static int smist_detach(device_t dev);
-static int smist_settings(device_t dev, struct cf_setting *sets,
- int *count);
-static int smist_set(device_t dev, const struct cf_setting *set);
-static int smist_get(device_t dev, struct cf_setting *set);
-static int smist_type(device_t dev, int *type);
-
-static device_method_t smist_methods[] = {
- /* Device interface */
- DEVMETHOD(device_identify, smist_identify),
- DEVMETHOD(device_probe, smist_probe),
- DEVMETHOD(device_attach, smist_attach),
- DEVMETHOD(device_detach, smist_detach),
-
- /* cpufreq interface */
- DEVMETHOD(cpufreq_drv_set, smist_set),
- DEVMETHOD(cpufreq_drv_get, smist_get),
- DEVMETHOD(cpufreq_drv_type, smist_type),
- DEVMETHOD(cpufreq_drv_settings, smist_settings),
-
- {0, 0}
-};
-
-static driver_t smist_driver = {
- "smist", smist_methods, sizeof(struct smist_softc)
-};
-static devclass_t smist_devclass;
-DRIVER_MODULE(smist, cpu, smist_driver, smist_devclass, 0, 0);
-
-struct piix4_pci_device {
- uint16_t vendor;
- uint16_t device;
- char *desc;
-};
-
-static struct piix4_pci_device piix4_pci_devices[] = {
- {0x8086, 0x7113, "Intel PIIX4 ISA bridge"},
- {0x8086, 0x719b, "Intel PIIX4 ISA bridge (embedded in MX440 chipset)"},
-
- {0, 0, NULL},
-};
-
-#define SET_OWNERSHIP 0
-#define GET_STATE 1
-#define SET_STATE 2
-
-static int
-int15_gsic_call(int *sig, int *smi_cmd, int *command, int *smi_data, int *flags)
-{
- struct vm86frame vmf;
-
- bzero(&vmf, sizeof(vmf));
- vmf.vmf_eax = 0x0000E980; /* IST support */
- vmf.vmf_edx = 0x47534943; /* 'GSIC' in ASCII */
- vm86_intcall(0x15, &vmf);
-
- if (vmf.vmf_eax == 0x47534943) {
- *sig = vmf.vmf_eax;
- *smi_cmd = vmf.vmf_ebx & 0xff;
- *command = (vmf.vmf_ebx >> 16) & 0xff;
- *smi_data = vmf.vmf_ecx;
- *flags = vmf.vmf_edx;
- } else {
- *sig = -1;
- *smi_cmd = -1;
- *command = -1;
- *smi_data = -1;
- *flags = -1;
- }
-
- return (0);
-}
-
-/* Temporary structure to hold mapped page and status. */
-struct set_ownership_data {
- int smi_cmd;
- int command;
- int result;
- void *buf;
-};
-
-/* Perform actual SMI call to enable SpeedStep. */
-static void
-set_ownership_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
-{
- struct set_ownership_data *data;
-
- data = arg;
- if (error) {
- data->result = error;
- return;
- }
-
- /* Copy in the magic string and send it by writing to the SMI port. */
- strlcpy(data->buf, smist_magic, PAGE_SIZE);
- __asm __volatile(
- "movl $-1, %%edi\n\t"
- "out %%al, (%%dx)\n"
- : "=D" (data->result)
- : "a" (data->command),
- "b" (0),
- "c" (0),
- "d" (data->smi_cmd),
- "S" ((uint32_t)segs[0].ds_addr)
- );
-}
-
-static int
-set_ownership(device_t dev)
-{
- struct smist_softc *sc;
- struct set_ownership_data cb_data;
- bus_dma_tag_t tag;
- bus_dmamap_t map;
-
- /*
- * Specify the region to store the magic string. Since its address is
- * passed to the BIOS in a 32-bit register, we have to make sure it is
- * located in a physical page below 4 GB (i.e., for PAE.)
- */
- sc = device_get_softc(dev);
- if (bus_dma_tag_create(/*parent*/ NULL,
- /*alignment*/ PAGE_SIZE, /*no boundary*/ 0,
- /*lowaddr*/ BUS_SPACE_MAXADDR_32BIT, /*highaddr*/ BUS_SPACE_MAXADDR,
- NULL, NULL, /*maxsize*/ PAGE_SIZE, /*segments*/ 1,
- /*maxsegsize*/ PAGE_SIZE, 0, busdma_lock_mutex, &Giant,
- &tag) != 0) {
- device_printf(dev, "can't create mem tag\n");
- return (ENXIO);
- }
- if (bus_dmamem_alloc(tag, &cb_data.buf, BUS_DMA_NOWAIT, &map) != 0) {
- bus_dma_tag_destroy(tag);
- device_printf(dev, "can't alloc mapped mem\n");
- return (ENXIO);
- }
-
- /* Load the physical page map and take ownership in the callback. */
- cb_data.smi_cmd = sc->smi_cmd;
- cb_data.command = sc->command;
- if (bus_dmamap_load(tag, map, cb_data.buf, PAGE_SIZE, set_ownership_cb,
- &cb_data, BUS_DMA_NOWAIT) != 0) {
- bus_dmamem_free(tag, cb_data.buf, map);
- bus_dma_tag_destroy(tag);
- device_printf(dev, "can't load mem\n");
- return (ENXIO);
- };
- DPRINT(dev, "taking ownership over BIOS return %d\n", cb_data.result);
- bus_dmamap_unload(tag, map);
- bus_dmamem_free(tag, cb_data.buf, map);
- bus_dma_tag_destroy(tag);
- return (cb_data.result ? ENXIO : 0);
-}
-
-static int
-getset_state(struct smist_softc *sc, int *state, int function)
-{
- int new_state;
- int result;
- int eax;
-
- if (!sc)
- return (ENXIO);
-
- if (function != GET_STATE && function != SET_STATE)
- return (EINVAL);
-
- DPRINT(sc->dev, "calling GSI\n");
-
- __asm __volatile(
- "movl $-1, %%edi\n\t"
- "out %%al, (%%dx)\n"
- : "=a" (eax),
- "=b" (new_state),
- "=D" (result)
- : "a" (sc->command),
- "b" (function),
- "c" (*state),
- "d" (sc->smi_cmd)
- );
-
- DPRINT(sc->dev, "GSI returned: eax %.8x ebx %.8x edi %.8x\n",
- eax, new_state, result);
-
- *state = new_state & 1;
-
- switch (function) {
- case GET_STATE:
- if (eax)
- return (ENXIO);
- break;
- case SET_STATE:
- if (result)
- return (ENXIO);
- break;
- }
- return (0);
-}
-
-static void
-smist_identify(driver_t *driver, device_t parent)
-{
- struct piix4_pci_device *id;
- device_t piix4 = NULL;
-
- if (resource_disabled("ichst", 0))
- return;
-
- /* Check for a supported processor */
- if (cpu_vendor_id != CPU_VENDOR_INTEL)
- return;
- switch (cpu_id & 0xff0) {
- case 0x680: /* Pentium III [coppermine] */
- case 0x6a0: /* Pentium III [Tualatin] */
- break;
- default:
- return;
- }
-
- /* Check for a supported PCI-ISA bridge */
- for (id = piix4_pci_devices; id->desc != NULL; ++id) {
- if ((piix4 = pci_find_device(id->vendor, id->device)) != NULL)
- break;
- }
- if (!piix4)
- return;
-
- if (bootverbose)
- printf("smist: found supported isa bridge %s\n", id->desc);
-
- if (device_find_child(parent, "smist", -1) != NULL)
- return;
- if (BUS_ADD_CHILD(parent, 30, "smist", -1) == NULL)
- device_printf(parent, "smist: add child failed\n");
-}
-
-static int
-smist_probe(device_t dev)
-{
- struct smist_softc *sc;
- device_t ichss_dev, perf_dev;
- int sig, smi_cmd, command, smi_data, flags;
- int type;
- int rv;
-
- if (resource_disabled("smist", 0))
- return (ENXIO);
-
- sc = device_get_softc(dev);
-
- /*
- * If the ACPI perf or ICH SpeedStep drivers have attached and not
- * just offering info, let them manage things.
- */
- perf_dev = device_find_child(device_get_parent(dev), "acpi_perf", -1);
- if (perf_dev && device_is_attached(perf_dev)) {
- rv = CPUFREQ_DRV_TYPE(perf_dev, &type);
- if (rv == 0 && (type & CPUFREQ_FLAG_INFO_ONLY) == 0)
- return (ENXIO);
- }
- ichss_dev = device_find_child(device_get_parent(dev), "ichss", -1);
- if (ichss_dev && device_is_attached(ichss_dev))
- return (ENXIO);
-
- int15_gsic_call(&sig, &smi_cmd, &command, &smi_data, &flags);
- if (bootverbose)
- device_printf(dev, "sig %.8x smi_cmd %.4x command %.2x "
- "smi_data %.4x flags %.8x\n",
- sig, smi_cmd, command, smi_data, flags);
-
- if (sig != -1) {
- sc->smi_cmd = smi_cmd;
- sc->smi_data = smi_data;
-
- /*
- * Sometimes int 15h 'GSIC' returns 0x80 for command, when
- * it is actually 0x82. The Windows driver will overwrite
- * this value given by the registry.
- */
- if (command == 0x80) {
- device_printf(dev,
- "GSIC returned cmd 0x80, should be 0x82\n");
- command = 0x82;
- }
- sc->command = (sig & 0xffffff00) | (command & 0xff);
- sc->flags = flags;
- } else {
- /* Give some default values */
- sc->smi_cmd = 0xb2;
- sc->smi_data = 0xb3;
- sc->command = 0x47534982;
- sc->flags = 0;
- }
-
- device_set_desc(dev, "SpeedStep SMI");
-
- return (-1500);
-}
-
-static int
-smist_attach(device_t dev)
-{
- struct smist_softc *sc;
-
- sc = device_get_softc(dev);
- sc->dev = dev;
-
- /* If we can't take ownership over BIOS, then bail out */
- if (set_ownership(dev) != 0)
- return (ENXIO);
-
- /* Setup some defaults for our exported settings. */
- sc->sets[0].freq = CPUFREQ_VAL_UNKNOWN;
- sc->sets[0].volts = CPUFREQ_VAL_UNKNOWN;
- sc->sets[0].power = CPUFREQ_VAL_UNKNOWN;
- sc->sets[0].lat = 1000;
- sc->sets[0].dev = dev;
- sc->sets[1] = sc->sets[0];
-
- cpufreq_register(dev);
-
- return (0);
-}
-
-static int
-smist_detach(device_t dev)
-{
-
- return (cpufreq_unregister(dev));
-}
-
-static int
-smist_settings(device_t dev, struct cf_setting *sets, int *count)
-{
- struct smist_softc *sc;
- struct cf_setting set;
- int first, i;
-
- if (sets == NULL || count == NULL)
- return (EINVAL);
- if (*count < 2) {
- *count = 2;
- return (E2BIG);
- }
- sc = device_get_softc(dev);
-
- /*
- * Estimate frequencies for both levels, temporarily switching to
- * the other one if we haven't calibrated it yet.
- */
- for (i = 0; i < 2; i++) {
- if (sc->sets[i].freq == CPUFREQ_VAL_UNKNOWN) {
- first = (i == 0) ? 1 : 0;
- smist_set(dev, &sc->sets[i]);
- smist_get(dev, &set);
- smist_set(dev, &sc->sets[first]);
- }
- }
-
- bcopy(sc->sets, sets, sizeof(sc->sets));
- *count = 2;
-
- return (0);
-}
-
-static int
-smist_set(device_t dev, const struct cf_setting *set)
-{
- struct smist_softc *sc;
- int rv, state, req_state, try;
-
- /* Look up appropriate bit value based on frequency. */
- sc = device_get_softc(dev);
- if (CPUFREQ_CMP(set->freq, sc->sets[0].freq))
- req_state = 0;
- else if (CPUFREQ_CMP(set->freq, sc->sets[1].freq))
- req_state = 1;
- else
- return (EINVAL);
-
- DPRINT(dev, "requested setting %d\n", req_state);
-
- rv = getset_state(sc, &state, GET_STATE);
- if (state == req_state)
- return (0);
-
- try = 3;
- do {
- rv = getset_state(sc, &req_state, SET_STATE);
-
- /* Sleep for 200 microseconds. This value is just a guess. */
- if (rv)
- DELAY(200);
- } while (rv && --try);
- DPRINT(dev, "set_state return %d, tried %d times\n",
- rv, 4 - try);
-
- return (rv);
-}
-
-static int
-smist_get(device_t dev, struct cf_setting *set)
-{
- struct smist_softc *sc;
- uint64_t rate;
- int state;
- int rv;
-
- sc = device_get_softc(dev);
- rv = getset_state(sc, &state, GET_STATE);
- if (rv != 0)
- return (rv);
-
- /* If we haven't changed settings yet, estimate the current value. */
- if (sc->sets[state].freq == CPUFREQ_VAL_UNKNOWN) {
- cpu_est_clockrate(0, &rate);
- sc->sets[state].freq = rate / 1000000;
- DPRINT(dev, "get calibrated new rate of %d\n",
- sc->sets[state].freq);
- }
- *set = sc->sets[state];
-
- return (0);
-}
-
-static int
-smist_type(device_t dev, int *type)
-{
-
- if (type == NULL)
- return (EINVAL);
-
- *type = CPUFREQ_TYPE_ABSOLUTE;
- return (0);
-}
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