arch/x86/cpu/intel_common/acpi.c - github/trini/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Generic Intel ACPI table generation
  *
  * Copyright (C) 2017 Intel Corp.
  * Copyright 2019 Google LLC
  *
  * Modified from coreboot src/soc/intel/common/block/acpi.c
  */

 #include <bloblist.h>
 #include <cpu.h>
 #include <dm.h>
 #include <acpi/acpigen.h>
 #include <asm/acpigen.h>
 #include <asm/acpi_table.h>
 #include <asm/cpu.h>
 #include <asm/cpu_common.h>
 #include <asm/global_data.h>
 #include <asm/intel_acpi.h>
 #include <asm/ioapic.h>
 #include <asm/mpspec.h>
 #include <asm/smm.h>
 #include <asm/turbo.h>
 #include <asm/intel_gnvs.h>
 #include <asm/arch/iomap.h>
 #include <asm/arch/pm.h>
 #include <asm/arch/systemagent.h>
 #include <dm/acpi.h>
 #include <linux/err.h>
 #include <power/acpi_pmc.h>

 int acpi_fill_mcfg(struct acpi_ctx *ctx)
 {
 	size_t size;

 	/* PCI Segment Group 0, Start Bus Number 0, End Bus Number is 255 */
 	size = acpi_create_mcfg_mmconfig((void *)ctx->current,
 					 CONFIG_MMCONF_BASE_ADDRESS, 0, 0,
 					 (CONFIG_SA_PCIEX_LENGTH >> 20) - 1);
 	acpi_inc(ctx, size);

 	return 0;
 }

 static int acpi_sci_irq(void)
 {
 	int sci_irq = 9;
 	uint scis;
 	int ret;

 	ret = arch_read_sci_irq_select();
 	if (IS_ERR_VALUE(ret))
 		return log_msg_ret("sci_irq", ret);
 	scis = ret;
 	scis &= SCI_IRQ_MASK;
 	scis >>= SCI_IRQ_SHIFT;

 	/* Determine how SCI is routed. */
 	switch (scis) {
 	case SCIS_IRQ9:
 	case SCIS_IRQ10:
 	case SCIS_IRQ11:
 		sci_irq = scis - SCIS_IRQ9 + 9;
 		break;
 	case SCIS_IRQ20:
 	case SCIS_IRQ21:
 	case SCIS_IRQ22:
 	case SCIS_IRQ23:
 		sci_irq = scis - SCIS_IRQ20 + 20;
 		break;
 	default:
 		log_warning("Invalid SCI route! Defaulting to IRQ9\n");
 		sci_irq = 9;
 		break;
 	}

 	log_debug("SCI is IRQ%d\n", sci_irq);

 	return sci_irq;
 }

 static unsigned long acpi_madt_irq_overrides(unsigned long current)
 {
 	int sci = acpi_sci_irq();
 	u16 flags = MP_IRQ_TRIGGER_LEVEL;

 	if (sci < 0)
 		return log_msg_ret("sci irq", sci);

 	/* INT_SRC_OVR */
 	current += acpi_create_madt_irqoverride((void *)current, 0, 0, 2, 0);

 	flags |= arch_madt_sci_irq_polarity(sci);

 	/* SCI */
 	current +=
 	    acpi_create_madt_irqoverride((void *)current, 0, sci, sci, flags);

 	return current;
 }

 u32 acpi_fill_madt(u32 current)
 {
 	/* Local APICs */
 	current += acpi_create_madt_lapics(current);

 	/* IOAPIC */
 	current += acpi_create_madt_ioapic((void *)current, 2, IO_APIC_ADDR, 0);

 	return acpi_madt_irq_overrides(current);
 }

 void intel_acpi_fill_fadt(struct acpi_fadt *fadt)
 {
 	const u16 pmbase = IOMAP_ACPI_BASE;

 	/* Use ACPI 3.0 revision. */
 	fadt->header.revision = acpi_get_table_revision(ACPITAB_FADT);

 	fadt->sci_int = acpi_sci_irq();
 	fadt->smi_cmd = APM_CNT;
 	fadt->acpi_enable = APM_CNT_ACPI_ENABLE;
 	fadt->acpi_disable = APM_CNT_ACPI_DISABLE;
 	fadt->s4bios_req = 0x0;
 	fadt->pstate_cnt = 0;

 	fadt->pm1a_evt_blk = pmbase + PM1_STS;
 	fadt->pm1b_evt_blk = 0x0;
 	fadt->pm1a_cnt_blk = pmbase + PM1_CNT;
 	fadt->pm1b_cnt_blk = 0x0;

 	fadt->gpe0_blk = pmbase + GPE0_STS;

 	fadt->pm1_evt_len = 4;
 	fadt->pm1_cnt_len = 2;

 	/* GPE0 STS/EN pairs each 32 bits wide. */
 	fadt->gpe0_blk_len = 2 * GPE0_REG_MAX * sizeof(uint32_t);

 	fadt->flush_size = 0x400;	/* twice of cache size */
 	fadt->flush_stride = 0x10;	/* Cache line width  */
 	fadt->duty_offset = 1;
 	fadt->day_alrm = 0xd;

 	fadt->flags = ACPI_FADT_WBINVD | ACPI_FADT_C1_SUPPORTED |
 	    ACPI_FADT_C2_MP_SUPPORTED | ACPI_FADT_SLEEP_BUTTON |
 	    ACPI_FADT_RESET_REGISTER | ACPI_FADT_SEALED_CASE |
 	    ACPI_FADT_S4_RTC_WAKE | ACPI_FADT_PLATFORM_CLOCK;

 	fadt->reset_reg.space_id = 1;
 	fadt->reset_reg.bit_width = 8;
 	fadt->reset_reg.addrl = IO_PORT_RESET;
 	fadt->reset_value = RST_CPU | SYS_RST;

 	fadt->x_pm1a_evt_blk.space_id = 1;
 	fadt->x_pm1a_evt_blk.bit_width = fadt->pm1_evt_len * 8;
 	fadt->x_pm1a_evt_blk.addrl = pmbase + PM1_STS;

 	fadt->x_pm1b_evt_blk.space_id = 1;

 	fadt->x_pm1a_cnt_blk.space_id = 1;
 	fadt->x_pm1a_cnt_blk.bit_width = fadt->pm1_cnt_len * 8;
 	fadt->x_pm1a_cnt_blk.addrl = pmbase + PM1_CNT;

 	fadt->x_pm1b_cnt_blk.space_id = 1;

 	fadt->x_gpe1_blk.space_id = 1;
 }

 int intel_southbridge_write_acpi_tables(const struct udevice *dev,
 					struct acpi_ctx *ctx)
 {
 	int ret;

 	ret = acpi_write_dbg2_pci_uart(ctx, gd->cur_serial_dev,
 				       ACPI_ACCESS_SIZE_DWORD_ACCESS);
 	if (ret)
 		return log_msg_ret("dbg2", ret);

 	ret = acpi_write_hpet(ctx);
 	if (ret)
 		return log_msg_ret("hpet", ret);

 	return 0;
 }

 __weak u32 acpi_fill_soc_wake(u32 generic_pm1_en,
 			      const struct chipset_power_state *ps)
 {
 	return generic_pm1_en;
 }

 __weak int acpi_create_gnvs(struct acpi_global_nvs *gnvs)
 {
 	return 0;
 }

 int southbridge_inject_dsdt(const struct udevice *dev, struct acpi_ctx *ctx)
 {
 	struct acpi_global_nvs *gnvs;
 	int ret;

 	ret = bloblist_ensure_size(BLOBLISTT_ACPI_GNVS, sizeof(*gnvs), 0,
 				   (void **)&gnvs);
 	if (ret)
 		return log_msg_ret("bloblist", ret);

 	ret = acpi_create_gnvs(gnvs);
 	if (ret)
 		return log_msg_ret("gnvs", ret);

 	/*
 	 * TODO(sjg@chromum.org): tell SMI about it
 	 * smm_setup_structures(gnvs, NULL, NULL);
 	 */

 	/* Add it to DSDT */
 	acpigen_write_scope(ctx, "\\");
 	acpigen_write_name_dword(ctx, "NVSA", (uintptr_t)gnvs);
 	acpigen_pop_len(ctx);

 	return 0;
 }

 static int calculate_power(int tdp, int p1_ratio, int ratio)
 {
 	u32 m;
 	u32 power;

 	/*
 	 * M = ((1.1 - ((p1_ratio - ratio) * 0.00625)) / 1.1) ^ 2
 	 *
 	 * Power = (ratio / p1_ratio) * m * tdp
 	 */

 	m = (110000 - ((p1_ratio - ratio) * 625)) / 11;
 	m = (m * m) / 1000;

 	power = ((ratio * 100000 / p1_ratio) / 100);
 	power *= (m / 100) * (tdp / 1000);
 	power /= 1000;

 	return power;
 }

 void generate_p_state_entries(struct acpi_ctx *ctx, int core,
 			      int cores_per_package)
 {
 	int ratio_min, ratio_max, ratio_turbo, ratio_step;
 	int coord_type, power_max, num_entries;
 	int ratio, power, clock, clock_max;
 	bool turbo;

 	coord_type = cpu_get_coord_type();
 	ratio_min = cpu_get_min_ratio();
 	ratio_max = cpu_get_max_ratio();
 	clock_max = (ratio_max * cpu_get_bus_clock_khz()) / 1000;
 	turbo = (turbo_get_state() == TURBO_ENABLED);

 	/* Calculate CPU TDP in mW */
 	power_max = cpu_get_power_max();

 	/* Write _PCT indicating use of FFixedHW */
 	acpigen_write_empty_pct(ctx);

 	/* Write _PPC with no limit on supported P-state */
 	acpigen_write_ppc_nvs(ctx);
 	/* Write PSD indicating configured coordination type */
 	acpigen_write_psd_package(ctx, core, 1, coord_type);

 	/* Add P-state entries in _PSS table */
 	acpigen_write_name(ctx, "_PSS");

 	/* Determine ratio points */
 	ratio_step = PSS_RATIO_STEP;
 	do {
 		num_entries = ((ratio_max - ratio_min) / ratio_step) + 1;
 		if (((ratio_max - ratio_min) % ratio_step) > 0)
 			num_entries += 1;
 		if (turbo)
 			num_entries += 1;
 		if (num_entries > PSS_MAX_ENTRIES)
 			ratio_step += 1;
 	} while (num_entries > PSS_MAX_ENTRIES);

 	/* _PSS package count depends on Turbo */
 	acpigen_write_package(ctx, num_entries);

 	/* P[T] is Turbo state if enabled */
 	if (turbo) {
 		ratio_turbo = cpu_get_max_turbo_ratio();

 		/* Add entry for Turbo ratio */
 		acpigen_write_pss_package(ctx, clock_max + 1,	/* MHz */
 					  power_max,		/* mW */
 					  PSS_LATENCY_TRANSITION,/* lat1 */
 					  PSS_LATENCY_BUSMASTER,/* lat2 */
 					  ratio_turbo << 8,	/* control */
 					  ratio_turbo << 8);	/* status */
 		num_entries -= 1;
 	}

 	/* First regular entry is max non-turbo ratio */
 	acpigen_write_pss_package(ctx, clock_max,	/* MHz */
 				  power_max,		/* mW */
 				  PSS_LATENCY_TRANSITION,/* lat1 */
 				  PSS_LATENCY_BUSMASTER,/* lat2 */
 				  ratio_max << 8,	/* control */
 				  ratio_max << 8);	/* status */
 	num_entries -= 1;

 	/* Generate the remaining entries */
 	for (ratio = ratio_min + ((num_entries - 1) * ratio_step);
 	     ratio >= ratio_min; ratio -= ratio_step) {
 		/* Calculate power at this ratio */
 		power = calculate_power(power_max, ratio_max, ratio);
 		clock = (ratio * cpu_get_bus_clock_khz()) / 1000;

 		acpigen_write_pss_package(ctx, clock,		/* MHz */
 					  power,		/* mW */
 					  PSS_LATENCY_TRANSITION,/* lat1 */
 					  PSS_LATENCY_BUSMASTER,/* lat2 */
 					  ratio << 8,		/* control */
 					  ratio << 8);		/* status */
 	}
 	/* Fix package length */
 	acpigen_pop_len(ctx);
 }

 void generate_t_state_entries(struct acpi_ctx *ctx, int core,
 			      int cores_per_package, struct acpi_tstate *entry,
 			      int nentries)
 {
 	if (!nentries)
 		return;

 	/* Indicate SW_ALL coordination for T-states */
 	acpigen_write_tsd_package(ctx, core, cores_per_package, SW_ALL);

 	/* Indicate FixedHW so OS will use MSR */
 	acpigen_write_empty_ptc(ctx);

 	/* Set NVS controlled T-state limit */
 	acpigen_write_tpc(ctx, "\\TLVL");

 	/* Write TSS table for MSR access */
 	acpigen_write_tss_package(ctx, entry, nentries);
 }

 int acpi_generate_cpu_header(struct acpi_ctx *ctx, int core_id,
 			     const struct acpi_cstate *c_state_map,
 			     int num_cstates)
 {
 	bool is_first = !core_id;

 	/* Generate processor \_PR.CPUx */
 	acpigen_write_processor(ctx, core_id, is_first ? ACPI_BASE_ADDRESS : 0,
 				is_first ? 6 : 0);

 	/* Generate C-state tables */
 	acpigen_write_cst_package(ctx, c_state_map, num_cstates);

 	return 0;
 }

 int acpi_generate_cpu_package_final(struct acpi_ctx *ctx, int cores_per_package)
 {
 	/*
 	 * PPKG is usually used for thermal management of the first and only
 	 * package
 	 */
 	acpigen_write_processor_package(ctx, "PPKG", 0, cores_per_package);

 	/* Add a method to notify processor nodes */
 	acpigen_write_processor_cnot(ctx, cores_per_package);

 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Generic Intel ACPI table generation
	*
	* Copyright (C) 2017 Intel Corp.
	* Copyright 2019 Google LLC
	*
	* Modified from coreboot src/soc/intel/common/block/acpi.c
	*/

	#include <bloblist.h>
	#include <cpu.h>
	#include <dm.h>
	#include <acpi/acpigen.h>
	#include <asm/acpigen.h>
	#include <asm/acpi_table.h>
	#include <asm/cpu.h>
	#include <asm/cpu_common.h>
	#include <asm/global_data.h>
	#include <asm/intel_acpi.h>
	#include <asm/ioapic.h>
	#include <asm/mpspec.h>
	#include <asm/smm.h>
	#include <asm/turbo.h>
	#include <asm/intel_gnvs.h>
	#include <asm/arch/iomap.h>
	#include <asm/arch/pm.h>
	#include <asm/arch/systemagent.h>
	#include <dm/acpi.h>
	#include <linux/err.h>
	#include <power/acpi_pmc.h>

	int acpi_fill_mcfg(struct acpi_ctx *ctx)
	{
	size_t size;

	/* PCI Segment Group 0, Start Bus Number 0, End Bus Number is 255 */
	size = acpi_create_mcfg_mmconfig((void *)ctx->current,
	CONFIG_MMCONF_BASE_ADDRESS, 0, 0,
	(CONFIG_SA_PCIEX_LENGTH >> 20) - 1);
	acpi_inc(ctx, size);

	return 0;
	}

	static int acpi_sci_irq(void)
	{
	int sci_irq = 9;
	uint scis;
	int ret;

	ret = arch_read_sci_irq_select();
	if (IS_ERR_VALUE(ret))
	return log_msg_ret("sci_irq", ret);
	scis = ret;
	scis &= SCI_IRQ_MASK;
	scis >>= SCI_IRQ_SHIFT;

	/* Determine how SCI is routed. */
	switch (scis) {
	case SCIS_IRQ9:
	case SCIS_IRQ10:
	case SCIS_IRQ11:
	sci_irq = scis - SCIS_IRQ9 + 9;
	break;
	case SCIS_IRQ20:
	case SCIS_IRQ21:
	case SCIS_IRQ22:
	case SCIS_IRQ23:
	sci_irq = scis - SCIS_IRQ20 + 20;
	break;
	default:
	log_warning("Invalid SCI route! Defaulting to IRQ9\n");
	sci_irq = 9;
	break;
	}

	log_debug("SCI is IRQ%d\n", sci_irq);

	return sci_irq;
	}

	static unsigned long acpi_madt_irq_overrides(unsigned long current)
	{
	int sci = acpi_sci_irq();
	u16 flags = MP_IRQ_TRIGGER_LEVEL;

	if (sci < 0)
	return log_msg_ret("sci irq", sci);

	/* INT_SRC_OVR */
	current += acpi_create_madt_irqoverride((void *)current, 0, 0, 2, 0);

	flags \|= arch_madt_sci_irq_polarity(sci);

	/* SCI */
	current +=
	acpi_create_madt_irqoverride((void *)current, 0, sci, sci, flags);

	return current;
	}

	u32 acpi_fill_madt(u32 current)
	{
	/* Local APICs */
	current += acpi_create_madt_lapics(current);

	/* IOAPIC */
	current += acpi_create_madt_ioapic((void *)current, 2, IO_APIC_ADDR, 0);

	return acpi_madt_irq_overrides(current);
	}

	void intel_acpi_fill_fadt(struct acpi_fadt *fadt)
	{
	const u16 pmbase = IOMAP_ACPI_BASE;

	/* Use ACPI 3.0 revision. */
	fadt->header.revision = acpi_get_table_revision(ACPITAB_FADT);

	fadt->sci_int = acpi_sci_irq();
	fadt->smi_cmd = APM_CNT;
	fadt->acpi_enable = APM_CNT_ACPI_ENABLE;
	fadt->acpi_disable = APM_CNT_ACPI_DISABLE;
	fadt->s4bios_req = 0x0;
	fadt->pstate_cnt = 0;

	fadt->pm1a_evt_blk = pmbase + PM1_STS;
	fadt->pm1b_evt_blk = 0x0;
	fadt->pm1a_cnt_blk = pmbase + PM1_CNT;
	fadt->pm1b_cnt_blk = 0x0;

	fadt->gpe0_blk = pmbase + GPE0_STS;

	fadt->pm1_evt_len = 4;
	fadt->pm1_cnt_len = 2;

	/* GPE0 STS/EN pairs each 32 bits wide. */
	fadt->gpe0_blk_len = 2 * GPE0_REG_MAX * sizeof(uint32_t);

	fadt->flush_size = 0x400; /* twice of cache size */
	fadt->flush_stride = 0x10; /* Cache line width */
	fadt->duty_offset = 1;
	fadt->day_alrm = 0xd;

	fadt->flags = ACPI_FADT_WBINVD \| ACPI_FADT_C1_SUPPORTED \|
	ACPI_FADT_C2_MP_SUPPORTED \| ACPI_FADT_SLEEP_BUTTON \|
	ACPI_FADT_RESET_REGISTER \| ACPI_FADT_SEALED_CASE \|
	ACPI_FADT_S4_RTC_WAKE \| ACPI_FADT_PLATFORM_CLOCK;

	fadt->reset_reg.space_id = 1;
	fadt->reset_reg.bit_width = 8;
	fadt->reset_reg.addrl = IO_PORT_RESET;
	fadt->reset_value = RST_CPU \| SYS_RST;

	fadt->x_pm1a_evt_blk.space_id = 1;
	fadt->x_pm1a_evt_blk.bit_width = fadt->pm1_evt_len * 8;
	fadt->x_pm1a_evt_blk.addrl = pmbase + PM1_STS;

	fadt->x_pm1b_evt_blk.space_id = 1;

	fadt->x_pm1a_cnt_blk.space_id = 1;
	fadt->x_pm1a_cnt_blk.bit_width = fadt->pm1_cnt_len * 8;
	fadt->x_pm1a_cnt_blk.addrl = pmbase + PM1_CNT;

	fadt->x_pm1b_cnt_blk.space_id = 1;

	fadt->x_gpe1_blk.space_id = 1;
	}

	int intel_southbridge_write_acpi_tables(const struct udevice *dev,
	struct acpi_ctx *ctx)
	{
	int ret;

	ret = acpi_write_dbg2_pci_uart(ctx, gd->cur_serial_dev,
	ACPI_ACCESS_SIZE_DWORD_ACCESS);
	if (ret)
	return log_msg_ret("dbg2", ret);

	ret = acpi_write_hpet(ctx);
	if (ret)
	return log_msg_ret("hpet", ret);

	return 0;
	}

	__weak u32 acpi_fill_soc_wake(u32 generic_pm1_en,
	const struct chipset_power_state *ps)
	{
	return generic_pm1_en;
	}

	__weak int acpi_create_gnvs(struct acpi_global_nvs *gnvs)
	{
	return 0;
	}

	int southbridge_inject_dsdt(const struct udevice dev, struct acpi_ctx ctx)
	{
	struct acpi_global_nvs *gnvs;
	int ret;

	ret = bloblist_ensure_size(BLOBLISTT_ACPI_GNVS, sizeof(*gnvs), 0,
	(void **)&gnvs);
	if (ret)
	return log_msg_ret("bloblist", ret);

	ret = acpi_create_gnvs(gnvs);
	if (ret)
	return log_msg_ret("gnvs", ret);

	/*
	* TODO(sjg@chromum.org): tell SMI about it
	* smm_setup_structures(gnvs, NULL, NULL);
	*/

	/* Add it to DSDT */
	acpigen_write_scope(ctx, "\\");
	acpigen_write_name_dword(ctx, "NVSA", (uintptr_t)gnvs);
	acpigen_pop_len(ctx);

	return 0;
	}

	static int calculate_power(int tdp, int p1_ratio, int ratio)
	{
	u32 m;
	u32 power;

	/*
	* M = ((1.1 - ((p1_ratio - ratio) * 0.00625)) / 1.1) ^ 2
	*
	* Power = (ratio / p1_ratio) * m * tdp
	*/

	m = (110000 - ((p1_ratio - ratio) * 625)) / 11;
	m = (m * m) / 1000;

	power = ((ratio * 100000 / p1_ratio) / 100);
	power = (m / 100) (tdp / 1000);
	power /= 1000;

	return power;
	}

	void generate_p_state_entries(struct acpi_ctx *ctx, int core,
	int cores_per_package)
	{
	int ratio_min, ratio_max, ratio_turbo, ratio_step;
	int coord_type, power_max, num_entries;
	int ratio, power, clock, clock_max;
	bool turbo;

	coord_type = cpu_get_coord_type();
	ratio_min = cpu_get_min_ratio();
	ratio_max = cpu_get_max_ratio();
	clock_max = (ratio_max * cpu_get_bus_clock_khz()) / 1000;
	turbo = (turbo_get_state() == TURBO_ENABLED);

	/* Calculate CPU TDP in mW */
	power_max = cpu_get_power_max();

	/* Write _PCT indicating use of FFixedHW */
	acpigen_write_empty_pct(ctx);

	/* Write _PPC with no limit on supported P-state */
	acpigen_write_ppc_nvs(ctx);
	/* Write PSD indicating configured coordination type */
	acpigen_write_psd_package(ctx, core, 1, coord_type);

	/* Add P-state entries in _PSS table */
	acpigen_write_name(ctx, "_PSS");

	/* Determine ratio points */
	ratio_step = PSS_RATIO_STEP;
	do {
	num_entries = ((ratio_max - ratio_min) / ratio_step) + 1;
	if (((ratio_max - ratio_min) % ratio_step) > 0)
	num_entries += 1;
	if (turbo)
	num_entries += 1;
	if (num_entries > PSS_MAX_ENTRIES)
	ratio_step += 1;
	} while (num_entries > PSS_MAX_ENTRIES);

	/* _PSS package count depends on Turbo */
	acpigen_write_package(ctx, num_entries);

	/* P[T] is Turbo state if enabled */
	if (turbo) {
	ratio_turbo = cpu_get_max_turbo_ratio();

	/* Add entry for Turbo ratio */
	acpigen_write_pss_package(ctx, clock_max + 1, /* MHz */
	power_max, /* mW */
	PSS_LATENCY_TRANSITION,/* lat1 */
	PSS_LATENCY_BUSMASTER,/* lat2 */
	ratio_turbo << 8, /* control */
	ratio_turbo << 8); /* status */
	num_entries -= 1;
	}

	/* First regular entry is max non-turbo ratio */
	acpigen_write_pss_package(ctx, clock_max, /* MHz */
	power_max, /* mW */
	PSS_LATENCY_TRANSITION,/* lat1 */
	PSS_LATENCY_BUSMASTER,/* lat2 */
	ratio_max << 8, /* control */
	ratio_max << 8); /* status */
	num_entries -= 1;

	/* Generate the remaining entries */
	for (ratio = ratio_min + ((num_entries - 1) * ratio_step);
	ratio >= ratio_min; ratio -= ratio_step) {
	/* Calculate power at this ratio */
	power = calculate_power(power_max, ratio_max, ratio);
	clock = (ratio * cpu_get_bus_clock_khz()) / 1000;

	acpigen_write_pss_package(ctx, clock, /* MHz */
	power, /* mW */
	PSS_LATENCY_TRANSITION,/* lat1 */
	PSS_LATENCY_BUSMASTER,/* lat2 */
	ratio << 8, /* control */
	ratio << 8); /* status */
	}
	/* Fix package length */
	acpigen_pop_len(ctx);
	}

	void generate_t_state_entries(struct acpi_ctx *ctx, int core,
	int cores_per_package, struct acpi_tstate *entry,
	int nentries)
	{
	if (!nentries)
	return;

	/* Indicate SW_ALL coordination for T-states */
	acpigen_write_tsd_package(ctx, core, cores_per_package, SW_ALL);

	/* Indicate FixedHW so OS will use MSR */
	acpigen_write_empty_ptc(ctx);

	/* Set NVS controlled T-state limit */
	acpigen_write_tpc(ctx, "\\TLVL");

	/* Write TSS table for MSR access */
	acpigen_write_tss_package(ctx, entry, nentries);
	}

	int acpi_generate_cpu_header(struct acpi_ctx *ctx, int core_id,
	const struct acpi_cstate *c_state_map,
	int num_cstates)
	{
	bool is_first = !core_id;

	/* Generate processor \_PR.CPUx */
	acpigen_write_processor(ctx, core_id, is_first ? ACPI_BASE_ADDRESS : 0,
	is_first ? 6 : 0);

	/* Generate C-state tables */
	acpigen_write_cst_package(ctx, c_state_map, num_cstates);

	return 0;
	}

	int acpi_generate_cpu_package_final(struct acpi_ctx *ctx, int cores_per_package)
	{
	/*
	* PPKG is usually used for thermal management of the first and only
	* package
	*/
	acpigen_write_processor_package(ctx, "PPKG", 0, cores_per_package);

	/* Add a method to notify processor nodes */
	acpigen_write_processor_cnot(ctx, cores_per_package);

	return 0;
	}