// SPDX-FileCopyrightText: 2023 Google LLC
// SPDX-License-Identifier: Apache-2.0

#include "cpu_features_macros.h"

#ifdef CPU_FEATURES_ARCH_LOONGARCH
#if defined(CPU_FEATURES_OS_LINUX)

#include "cpuinfo_loongarch.h"

////////////////////////////////////////////////////////////////////////////////
// Definitions for introspection.
////////////////////////////////////////////////////////////////////////////////
#define INTROSPECTION_TABLE                                                     \
    LINE(LOONGARCH_CPUCFG, CPUCFG, "cfg", HWCAP_LOONGARCH_CPUCFG, 0)            \
    LINE(LOONGARCH_LAM, LAM, "lam", HWCAP_LOONGARCH_LAM, 0)                     \
    LINE(LOONGARCH_UAL, UAL, "ual", HWCAP_LOONGARCH_UAL, 0)                     \
    LINE(LOONGARCH_FPU, FPU, "fpu", HWCAP_LOONGARCH_FPU, 0)                     \
    LINE(LOONGARCH_LSX, LSX, "lsx", HWCAP_LOONGARCH_LSX, 0)                     \
    LINE(LOONGARCH_LASX, LASX, "lasx", HWCAP_LOONGARCH_LASX, 0)                 \
    LINE(LOONGARCH_CRC32, CRC32, "crc32", HWCAP_LOONGARCH_CRC32, 0)             \
    LINE(LOONGARCH_COMPLEX, COMPLEX, "complex", HWCAP_LOONGARCH_COMPLEX, 0)     \
    LINE(LOONGARCH_CRYPTO, CRYPTO, "crypto", HWCAP_LOONGARCH_CRYPTO, 0)         \
    LINE(LOONGARCH_LVZ, LVZ, "lvz", HWCAP_LOONGARCH_LVZ, 0)                     \
    LINE(LOONGARCH_LBT_X86, LBT_X86, "lbt_x86", HWCAP_LOONGARCH_LBT_X86, 0)     \
    LINE(LOONGARCH_LBT_ARM, LBT_ARM, "lbt_arm", HWCAP_LOONGARCH_LBT_ARM, 0)     \
    LINE(LOONGARCH_LBT_MIPS, LBT_MIPS, "lbt_mips", HWCAP_LOONGARCH_LBT_MIPS, 0) \
    LINE(LOONGARCH_PTW, PTW, "ptw", HWCAP_LOONGARCH_PTW, 0)
#define INTROSPECTION_PREFIX LoongArch
#define INTROSPECTION_ENUM_PREFIX LOONGARCH
#include "define_introspection_and_hwcaps.inl"

////////////////////////////////////////////////////////////////////////////////
// Implementation.
////////////////////////////////////////////////////////////////////////////////

#include "internal/filesystem.h"
#include "internal/stack_line_reader.h"
#include <stdbool.h>
#include <stdio.h>

static const LoongArchInfo kEmptyLoongArchInfo;

static bool HandleLoongArchLine(const LineResult result,
    LoongArchInfo* const info)
{
    StringView line = result.line;
    StringView key, value;
    if (CpuFeatures_StringView_GetAttributeKeyValue(line, &key, &value))
        {
            if (CpuFeatures_StringView_IsEquals(key, str("Features")))
                {
                    for (size_t i = 0; i < LOONGARCH_LAST_; ++i)
                        {
                            kSetters[i](&info->features, CpuFeatures_StringView_HasWord(
                                                             value, kCpuInfoFlags[i], ' '));
                        }
                }
        }
    return !result.eof;
}

static void FillProcCpuInfoData(LoongArchInfo* const info)
{
    const int fd = CpuFeatures_OpenFile("/proc/cpuinfo");
    if (fd >= 0)
        {
            StackLineReader reader;
            StackLineReader_Initialize(&reader, fd);
            for (;;)
                {
                    if (!HandleLoongArchLine(StackLineReader_NextLine(&reader), info)) break;
                }
            CpuFeatures_CloseFile(fd);
        }
}

LoongArchInfo GetLoongArchInfo(void)
{
    LoongArchInfo info = kEmptyLoongArchInfo;
    FillProcCpuInfoData(&info);
    return info;
}

#endif  // defined(CPU_FEATURES_OS_LINUX)
#endif  // CPU_FEATURES_ARCH_LOONGARCH
