#pragma once

#include <stdbool.h>
#include <stdint.h>

#include <cpuinfo.h>
#include <cpuinfo/common.h>
#include <arm/midr.h>
#include <arm/api.h>
#include <linux/api.h>

/* No hard limit in the kernel, maximum length observed on non-rogue kernels is 64 */
#define CPUINFO_HARDWARE_VALUE_MAX 64

#ifdef __ANDROID__
	/* As per include/sys/system_properties.h in Android NDK */
	#define CPUINFO_BUILD_PROP_NAME_MAX  32
	#define CPUINFO_BUILD_PROP_VALUE_MAX 92

	struct cpuinfo_android_properties {
		char proc_cpuinfo_hardware[CPUINFO_HARDWARE_VALUE_MAX];
		char ro_product_board[CPUINFO_BUILD_PROP_VALUE_MAX];
		char ro_board_platform[CPUINFO_BUILD_PROP_VALUE_MAX];
		char ro_mediatek_platform[CPUINFO_BUILD_PROP_VALUE_MAX];
		char ro_arch[CPUINFO_BUILD_PROP_VALUE_MAX];
		char ro_chipname[CPUINFO_BUILD_PROP_VALUE_MAX];
		char ro_hardware_chipname[CPUINFO_BUILD_PROP_VALUE_MAX];
	};
#endif

#define CPUINFO_ARM_LINUX_ARCH_T   UINT32_C(0x00000001)
#define CPUINFO_ARM_LINUX_ARCH_E   UINT32_C(0x00000002)
#define CPUINFO_ARM_LINUX_ARCH_J   UINT32_C(0x00000004)

#define CPUINFO_ARM_LINUX_ARCH_TE  UINT32_C(0x00000003)
#define CPUINFO_ARM_LINUX_ARCH_TEJ UINT32_C(0x00000007)

struct cpuinfo_arm_linux_proc_cpuinfo_cache {
	uint32_t i_size;
	uint32_t i_assoc;
	uint32_t i_line_length;
	uint32_t i_sets;
	uint32_t d_size;
	uint32_t d_assoc;
	uint32_t d_line_length;
	uint32_t d_sets;
};

#if CPUINFO_ARCH_ARM
	/* arch/arm/include/uapi/asm/hwcap.h */

	#define CPUINFO_ARM_LINUX_FEATURE_SWP      UINT32_C(0x00000001)
	#define CPUINFO_ARM_LINUX_FEATURE_HALF     UINT32_C(0x00000002)
	#define CPUINFO_ARM_LINUX_FEATURE_THUMB    UINT32_C(0x00000004)
	#define CPUINFO_ARM_LINUX_FEATURE_26BIT    UINT32_C(0x00000008)
	#define CPUINFO_ARM_LINUX_FEATURE_FASTMULT UINT32_C(0x00000010)
	#define CPUINFO_ARM_LINUX_FEATURE_FPA      UINT32_C(0x00000020)
	#define CPUINFO_ARM_LINUX_FEATURE_VFP      UINT32_C(0x00000040)
	#define CPUINFO_ARM_LINUX_FEATURE_EDSP     UINT32_C(0x00000080)
	#define CPUINFO_ARM_LINUX_FEATURE_JAVA     UINT32_C(0x00000100)
	#define CPUINFO_ARM_LINUX_FEATURE_IWMMXT   UINT32_C(0x00000200)
	#define CPUINFO_ARM_LINUX_FEATURE_CRUNCH   UINT32_C(0x00000400)
	#define CPUINFO_ARM_LINUX_FEATURE_THUMBEE  UINT32_C(0x00000800)
	#define CPUINFO_ARM_LINUX_FEATURE_NEON     UINT32_C(0x00001000)
	#define CPUINFO_ARM_LINUX_FEATURE_VFPV3    UINT32_C(0x00002000)
	#define CPUINFO_ARM_LINUX_FEATURE_VFPV3D16 UINT32_C(0x00004000) /* Also set for VFPv4 with 16 double-precision registers */
	#define CPUINFO_ARM_LINUX_FEATURE_TLS      UINT32_C(0x00008000)
	#define CPUINFO_ARM_LINUX_FEATURE_VFPV4    UINT32_C(0x00010000)
	#define CPUINFO_ARM_LINUX_FEATURE_IDIVA    UINT32_C(0x00020000)
	#define CPUINFO_ARM_LINUX_FEATURE_IDIVT    UINT32_C(0x00040000)
	#define CPUINFO_ARM_LINUX_FEATURE_IDIV     UINT32_C(0x00060000)
	#define CPUINFO_ARM_LINUX_FEATURE_VFPD32   UINT32_C(0x00080000)
	#define CPUINFO_ARM_LINUX_FEATURE_LPAE     UINT32_C(0x00100000)
	#define CPUINFO_ARM_LINUX_FEATURE_EVTSTRM  UINT32_C(0x00200000)

	#define CPUINFO_ARM_LINUX_FEATURE2_AES   UINT32_C(0x00000001)
	#define CPUINFO_ARM_LINUX_FEATURE2_PMULL UINT32_C(0x00000002)
	#define CPUINFO_ARM_LINUX_FEATURE2_SHA1  UINT32_C(0x00000004)
	#define CPUINFO_ARM_LINUX_FEATURE2_SHA2  UINT32_C(0x00000008)
	#define CPUINFO_ARM_LINUX_FEATURE2_CRC32 UINT32_C(0x00000010)
#elif CPUINFO_ARCH_ARM64
	/* arch/arm64/include/uapi/asm/hwcap.h */
	#define CPUINFO_ARM_LINUX_FEATURE_FP       UINT32_C(0x00000001)
	#define CPUINFO_ARM_LINUX_FEATURE_ASIMD    UINT32_C(0x00000002)
	#define CPUINFO_ARM_LINUX_FEATURE_EVTSTRM  UINT32_C(0x00000004)
	#define CPUINFO_ARM_LINUX_FEATURE_AES      UINT32_C(0x00000008)
	#define CPUINFO_ARM_LINUX_FEATURE_PMULL    UINT32_C(0x00000010)
	#define CPUINFO_ARM_LINUX_FEATURE_SHA1     UINT32_C(0x00000020)
	#define CPUINFO_ARM_LINUX_FEATURE_SHA2     UINT32_C(0x00000040)
	#define CPUINFO_ARM_LINUX_FEATURE_CRC32    UINT32_C(0x00000080)
	#define CPUINFO_ARM_LINUX_FEATURE_ATOMICS  UINT32_C(0x00000100)
	#define CPUINFO_ARM_LINUX_FEATURE_FPHP     UINT32_C(0x00000200)
	#define CPUINFO_ARM_LINUX_FEATURE_ASIMDHP  UINT32_C(0x00000400)
	#define CPUINFO_ARM_LINUX_FEATURE_CPUID    UINT32_C(0x00000800)
	#define CPUINFO_ARM_LINUX_FEATURE_ASIMDRDM UINT32_C(0x00001000)
	#define CPUINFO_ARM_LINUX_FEATURE_JSCVT    UINT32_C(0x00002000)
	#define CPUINFO_ARM_LINUX_FEATURE_FCMA     UINT32_C(0x00004000)
	#define CPUINFO_ARM_LINUX_FEATURE_LRCPC    UINT32_C(0x00008000)
	#define CPUINFO_ARM_LINUX_FEATURE_DCPOP    UINT32_C(0x00010000)
	#define CPUINFO_ARM_LINUX_FEATURE_SHA3     UINT32_C(0x00020000)
	#define CPUINFO_ARM_LINUX_FEATURE_SM3      UINT32_C(0x00040000)
	#define CPUINFO_ARM_LINUX_FEATURE_SM4      UINT32_C(0x00080000)
	#define CPUINFO_ARM_LINUX_FEATURE_ASIMDDP  UINT32_C(0x00100000)
	#define CPUINFO_ARM_LINUX_FEATURE_SHA512   UINT32_C(0x00200000)
	#define CPUINFO_ARM_LINUX_FEATURE_SVE      UINT32_C(0x00400000)
	#define CPUINFO_ARM_LINUX_FEATURE_ASIMDFHM UINT32_C(0x00800000)
	#define CPUINFO_ARM_LINUX_FEATURE_DIT      UINT32_C(0x01000000)
	#define CPUINFO_ARM_LINUX_FEATURE_USCAT    UINT32_C(0x02000000)
	#define CPUINFO_ARM_LINUX_FEATURE_ILRCPC   UINT32_C(0x04000000)
	#define CPUINFO_ARM_LINUX_FEATURE_FLAGM    UINT32_C(0x08000000)
	#define CPUINFO_ARM_LINUX_FEATURE_SSBS     UINT32_C(0x10000000)
#endif

#define CPUINFO_ARM_LINUX_VALID_ARCHITECTURE UINT32_C(0x00010000)
#define CPUINFO_ARM_LINUX_VALID_IMPLEMENTER  UINT32_C(0x00020000)
#define CPUINFO_ARM_LINUX_VALID_VARIANT      UINT32_C(0x00040000)
#define CPUINFO_ARM_LINUX_VALID_PART         UINT32_C(0x00080000)
#define CPUINFO_ARM_LINUX_VALID_REVISION     UINT32_C(0x00100000)
#define CPUINFO_ARM_LINUX_VALID_PROCESSOR    UINT32_C(0x00200000)
#define CPUINFO_ARM_LINUX_VALID_FEATURES     UINT32_C(0x00400000)
#if CPUINFO_ARCH_ARM
	#define CPUINFO_ARM_LINUX_VALID_ICACHE_SIZE UINT32_C(0x01000000)
	#define CPUINFO_ARM_LINUX_VALID_ICACHE_SETS UINT32_C(0x02000000)
	#define CPUINFO_ARM_LINUX_VALID_ICACHE_WAYS UINT32_C(0x04000000)
	#define CPUINFO_ARM_LINUX_VALID_ICACHE_LINE UINT32_C(0x08000000)
	#define CPUINFO_ARM_LINUX_VALID_DCACHE_SIZE UINT32_C(0x10000000)
	#define CPUINFO_ARM_LINUX_VALID_DCACHE_SETS UINT32_C(0x20000000)
	#define CPUINFO_ARM_LINUX_VALID_DCACHE_WAYS UINT32_C(0x40000000)
	#define CPUINFO_ARM_LINUX_VALID_DCACHE_LINE UINT32_C(0x80000000)
#endif

#define CPUINFO_ARM_LINUX_VALID_INFO          UINT32_C(0x007F0000)
#define CPUINFO_ARM_LINUX_VALID_MIDR          UINT32_C(0x003F0000)
#if CPUINFO_ARCH_ARM
	#define CPUINFO_ARM_LINUX_VALID_ICACHE     UINT32_C(0x0F000000)
	#define CPUINFO_ARM_LINUX_VALID_DCACHE     UINT32_C(0xF0000000)
	#define CPUINFO_ARM_LINUX_VALID_CACHE_LINE UINT32_C(0x88000000)
#endif

struct cpuinfo_arm_linux_processor {
	uint32_t architecture_version;
#if CPUINFO_ARCH_ARM
	uint32_t architecture_flags;
	struct cpuinfo_arm_linux_proc_cpuinfo_cache proc_cpuinfo_cache;
#endif
	uint32_t features;
#if CPUINFO_ARCH_ARM
	uint32_t features2;
#endif
	/**
	 * Main ID Register value.
	 */
	uint32_t midr;
	enum cpuinfo_vendor vendor;
	enum cpuinfo_uarch uarch;
	uint32_t uarch_index;
	/**
	 * ID of the physical package which includes this logical processor.
	 * The value is parsed from /sys/devices/system/cpu/cpu<N>/topology/physical_package_id
	 */
	uint32_t package_id;
	/**
	 * Minimum processor ID on the package which includes this logical processor.
	 * This value can serve as an ID for the cluster of logical processors: it is the
	 * same for all logical processors on the same package.
	 */
	uint32_t package_leader_id;
	/**
	 * Number of logical processors in the package.
	 */
	uint32_t package_processor_count;
	/**
	 * Maximum frequency, in kHZ.
	 * The value is parsed from /sys/devices/system/cpu/cpu<N>/cpufreq/cpuinfo_max_freq
	 * If failed to read or parse the file, the value is 0.
	 */
	uint32_t max_frequency;
	/**
	 * Minimum frequency, in kHZ.
	 * The value is parsed from /sys/devices/system/cpu/cpu<N>/cpufreq/cpuinfo_min_freq
	 * If failed to read or parse the file, the value is 0.
	 */
	uint32_t min_frequency;
	/** Linux processor ID */
	uint32_t system_processor_id;
	uint32_t flags;
};

struct cpuinfo_arm_linux_cluster {
	uint32_t processor_id_min;
	uint32_t processor_id_max;
};

/* Returns true if the two processors do belong to the same cluster */
static inline bool cpuinfo_arm_linux_processor_equals(
	struct cpuinfo_arm_linux_processor processor_i[restrict static 1],
	struct cpuinfo_arm_linux_processor processor_j[restrict static 1])
{
	const uint32_t joint_flags = processor_i->flags & processor_j->flags;

	bool same_max_frequency = false;
	if (joint_flags & CPUINFO_LINUX_FLAG_MAX_FREQUENCY) {
		if (processor_i->max_frequency != processor_j->max_frequency) {
			return false;
		} else {
			same_max_frequency = true;
		}
	}

	bool same_min_frequency = false;
	if (joint_flags & CPUINFO_LINUX_FLAG_MIN_FREQUENCY) {
		if (processor_i->min_frequency != processor_j->min_frequency) {
			return false;
		} else {
			same_min_frequency = true;
		}
	}

	if ((joint_flags & CPUINFO_ARM_LINUX_VALID_MIDR) == CPUINFO_ARM_LINUX_VALID_MIDR) {
		if (processor_i->midr == processor_j->midr) {
			if (midr_is_cortex_a53(processor_i->midr)) {
				return same_min_frequency & same_max_frequency;
			} else {
				return true;
			}
		}
	}

	return same_max_frequency && same_min_frequency;
}

/* Returns true if the two processors certainly don't belong to the same cluster */
static inline bool cpuinfo_arm_linux_processor_not_equals(
	struct cpuinfo_arm_linux_processor processor_i[restrict static 1],
	struct cpuinfo_arm_linux_processor processor_j[restrict static 1])
{
	const uint32_t joint_flags = processor_i->flags & processor_j->flags;

	if (joint_flags & CPUINFO_LINUX_FLAG_MAX_FREQUENCY) {
		if (processor_i->max_frequency != processor_j->max_frequency) {
			return true;
		}
	}

	if (joint_flags & CPUINFO_LINUX_FLAG_MIN_FREQUENCY) {
		if (processor_i->min_frequency != processor_j->min_frequency) {
			return true;
		}
	}

	if ((joint_flags & CPUINFO_ARM_LINUX_VALID_MIDR) == CPUINFO_ARM_LINUX_VALID_MIDR) {
		if (processor_i->midr != processor_j->midr) {
			return true;
		}
	}

	return false;
}

CPUINFO_INTERNAL bool cpuinfo_arm_linux_parse_proc_cpuinfo(
	char hardware[restrict static CPUINFO_HARDWARE_VALUE_MAX],
	uint32_t max_processors_count,
	struct cpuinfo_arm_linux_processor processors[restrict static max_processors_count]);

#if CPUINFO_ARCH_ARM
	CPUINFO_INTERNAL bool cpuinfo_arm_linux_hwcap_from_getauxval(
		uint32_t hwcap[restrict static 1],
		uint32_t hwcap2[restrict static 1]);
	CPUINFO_INTERNAL bool cpuinfo_arm_linux_hwcap_from_procfs(
		uint32_t hwcap[restrict static 1],
		uint32_t hwcap2[restrict static 1]);

	CPUINFO_INTERNAL void cpuinfo_arm_linux_decode_isa_from_proc_cpuinfo(
		uint32_t features,
		uint32_t features2,
		uint32_t midr,
		uint32_t architecture_version,
		uint32_t architecture_flags,
		const struct cpuinfo_arm_chipset chipset[restrict static 1],
		struct cpuinfo_arm_isa isa[restrict static 1]);
#elif CPUINFO_ARCH_ARM64
	CPUINFO_INTERNAL uint32_t cpuinfo_arm_linux_hwcap_from_getauxval(void);
	CPUINFO_INTERNAL void cpuinfo_arm64_linux_decode_isa_from_proc_cpuinfo(
		uint32_t features,
		uint32_t midr,
		const struct cpuinfo_arm_chipset chipset[restrict static 1],
		struct cpuinfo_arm_isa isa[restrict static 1]);
#endif

#ifdef __ANDROID__
	CPUINFO_INTERNAL struct cpuinfo_arm_chipset
		cpuinfo_arm_android_decode_chipset(
			const struct cpuinfo_android_properties properties[restrict static 1],
			uint32_t cores,
			uint32_t max_cpu_freq_max);
#else
	CPUINFO_INTERNAL struct cpuinfo_arm_chipset
		cpuinfo_arm_linux_decode_chipset(
			const char hardware[restrict static CPUINFO_HARDWARE_VALUE_MAX],
			uint32_t cores,
			uint32_t max_cpu_freq_max);
#endif

CPUINFO_INTERNAL struct cpuinfo_arm_chipset
	cpuinfo_arm_linux_decode_chipset_from_proc_cpuinfo_hardware(
		const char proc_cpuinfo_hardware[restrict static CPUINFO_HARDWARE_VALUE_MAX],
		uint32_t cores, uint32_t max_cpu_freq_max, bool is_tegra);

#ifdef __ANDROID__
	CPUINFO_INTERNAL struct cpuinfo_arm_chipset
		cpuinfo_arm_android_decode_chipset_from_ro_product_board(
			const char ro_product_board[restrict static CPUINFO_BUILD_PROP_VALUE_MAX],
			uint32_t cores, uint32_t max_cpu_freq_max);
	CPUINFO_INTERNAL struct cpuinfo_arm_chipset
		cpuinfo_arm_android_decode_chipset_from_ro_board_platform(
			const char ro_board_platform[restrict static CPUINFO_BUILD_PROP_VALUE_MAX],
			uint32_t cores, uint32_t max_cpu_freq_max);
	CPUINFO_INTERNAL struct cpuinfo_arm_chipset
		cpuinfo_arm_android_decode_chipset_from_ro_mediatek_platform(
			const char ro_mediatek_platform[restrict static CPUINFO_BUILD_PROP_VALUE_MAX]);
	CPUINFO_INTERNAL struct cpuinfo_arm_chipset
		cpuinfo_arm_android_decode_chipset_from_ro_arch(
			const char ro_arch[restrict static CPUINFO_BUILD_PROP_VALUE_MAX]);
	CPUINFO_INTERNAL struct cpuinfo_arm_chipset
		cpuinfo_arm_android_decode_chipset_from_ro_chipname(
			const char ro_chipname[restrict static CPUINFO_BUILD_PROP_VALUE_MAX]);
	CPUINFO_INTERNAL struct cpuinfo_arm_chipset
		cpuinfo_arm_android_decode_chipset_from_ro_hardware_chipname(
			const char ro_hardware_chipname[restrict static CPUINFO_BUILD_PROP_VALUE_MAX]);
#endif

CPUINFO_INTERNAL bool cpuinfo_arm_linux_detect_core_clusters_by_heuristic(
	uint32_t usable_processors,
	uint32_t max_processors,
	struct cpuinfo_arm_linux_processor processors[restrict static max_processors]);

CPUINFO_INTERNAL void cpuinfo_arm_linux_detect_core_clusters_by_sequential_scan(
	uint32_t max_processors,
	struct cpuinfo_arm_linux_processor processors[restrict static max_processors]);

CPUINFO_INTERNAL void cpuinfo_arm_linux_count_cluster_processors(
	uint32_t max_processors,
	struct cpuinfo_arm_linux_processor processors[restrict static max_processors]);

CPUINFO_INTERNAL uint32_t cpuinfo_arm_linux_detect_cluster_midr(
	const struct cpuinfo_arm_chipset chipset[restrict static 1],
	uint32_t max_processors,
	uint32_t usable_processors,
	struct cpuinfo_arm_linux_processor processors[restrict static max_processors]);

extern CPUINFO_INTERNAL const uint32_t* cpuinfo_linux_cpu_to_uarch_index_map;
extern CPUINFO_INTERNAL uint32_t cpuinfo_linux_cpu_to_uarch_index_map_entries;