/*
 * Copyright (c) 2016 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include <fcntl.h>
#include <vppinfra/clib.h>
#include <vppinfra/format.h>
#include <vppinfra/cpu.h>

#define foreach_x86_cpu_uarch                                                 \
  _ (0x06, 0x9e, "Kaby Lake", "Kaby Lake DT/H/S/X")                           \
  _ (0x06, 0x9c, "Tremont", "Jasper Lake")                                    \
  _ (0x06, 0x9a, "Alder Lake", "Alder Lake L")                                \
  _ (0x06, 0x97, "Alder Lake", "Alder Lake")                                  \
  _ (0x06, 0x96, "Tremont", "Elkhart Lake")                                   \
  _ (0x06, 0x8f, "Sapphire Rapids", "Sapphire Rapids X")                      \
  _ (0x06, 0x8e, "Kaby Lake", "Kaby Lake Y/U")                                \
  _ (0x06, 0x8c, "Tiger Lake", "Tiger Lake U")                                \
  _ (0x06, 0x86, "Tremont", "Jacobsville")                                    \
  _ (0x06, 0x85, "Knights Mill", "Knights Mill")                              \
  _ (0x06, 0x7e, "Ice Lake", "Ice Lake U")                                    \
  _ (0x06, 0x7d, "Ice Lake", "Ice Lake Y")                                    \
  _ (0x06, 0x7a, "Goldmont Plus", "Gemini Lake")                              \
  _ (0x06, 0x6c, "Ice Lake", "Ice Lake SP")                                   \
  _ (0x06, 0x6a, "Ice Lake", "Ice Lake DE")                                   \
  _ (0x06, 0x66, "Cannon Lake", "Cannon Lake U")                              \
  _ (0x06, 0x5f, "Goldmont", "Denverton")                                     \
  _ (0x06, 0x5e, "Skylake", "Skylake DT/H/S")                                 \
  _ (0x06, 0x5c, "Goldmont", "Apollo Lake")                                   \
  _ (0x06, 0x5a, "Silvermont", "Moorefield")                                  \
  _ (0x06, 0x57, "Knights Landing", "Knights Landing")                        \
  _ (0x06, 0x56, "Broadwell", "Broadwell DE")                                 \
  _ (0x06, 0x55, "Skylake", "Skylake X/SP")                                   \
  _ (0x06, 0x4f, "Broadwell", "Broadwell EP/EX")                              \
  _ (0x06, 0x4e, "Skylake", "Skylake Y/U")                                    \
  _ (0x06, 0x4d, "Silvermont", "Rangeley")                                    \
  _ (0x06, 0x4c, "Airmont", "Braswell")                                       \
  _ (0x06, 0x47, "Broadwell", "Broadwell H")                                  \
  _ (0x06, 0x46, "Haswell", "Crystalwell")                                    \
  _ (0x06, 0x45, "Haswell", "Haswell ULT")                                    \
  _ (0x06, 0x3f, "Haswell", "Haswell E")                                      \
  _ (0x06, 0x3e, "Ivy Bridge", "Ivy Bridge E/EN/EP")                          \
  _ (0x06, 0x3d, "Broadwell", "Broadwell U")                                  \
  _ (0x06, 0x3c, "Haswell", "Haswell")                                        \
  _ (0x06, 0x3a, "Ivy Bridge", "IvyBridge")                                   \
  _ (0x06, 0x37, "Silvermont", "BayTrail")                                    \
  _ (0x06, 0x36, "Saltwell", "Cedarview,Centerton")                           \
  _ (0x06, 0x35, "Saltwell", "Cloverview")                                    \
  _ (0x06, 0x2f, "Westmere", "Westmere EX")                                   \
  _ (0x06, 0x2e, "Nehalem", "Nehalem EX")                                     \
  _ (0x06, 0x2d, "Sandy Bridge", "SandyBridge E/EN/EP")                       \
  _ (0x06, 0x2c, "Westmere", "Westmere EP/EX,Gulftown")                       \
  _ (0x06, 0x2a, "Sandy Bridge", "Sandy Bridge")                              \
  _ (0x06, 0x27, "Saltwell", "Medfield")                                      \
  _ (0x06, 0x26, "Bonnell", "Tunnel Creek")                                   \
  _ (0x06, 0x25, "Westmere", "Arrandale,Clarksdale")                          \
  _ (0x06, 0x1e, "Nehalem", "Clarksfield,Lynnfield,Jasper Forest")            \
  _ (0x06, 0x1d, "Penryn", "Dunnington")                                      \
  _ (0x06, 0x1c, "Bonnell", "Pineview,Silverthorne")                          \
  _ (0x06, 0x1a, "Nehalem", "Nehalem EP,Bloomfield)")                         \
  _ (0x06, 0x17, "Penryn", "Yorkfield,Wolfdale,Penryn,Harpertown")

/* _(implementor-id, part-id, vendor-name, cpu-name, show CPU pass as string) */
#define foreach_aarch64_cpu_uarch                                             \
  _ (0x41, 0xd03, "ARM", "Cortex-A53", 0)                                     \
  _ (0x41, 0xd07, "ARM", "Cortex-A57", 0)                                     \
  _ (0x41, 0xd08, "ARM", "Cortex-A72", 0)                                     \
  _ (0x41, 0xd09, "ARM", "Cortex-A73", 0)                                     \
  _ (0x41, 0xd0a, "ARM", "Cortex-A75", 0)                                     \
  _ (0x41, 0xd0b, "ARM", "Cortex-A76", 0)                                     \
  _ (0x41, 0xd0c, "ARM", "Neoverse-N1", 0)                                    \
  _ (0x41, 0xd49, "ARM", "Neoverse-N2", 0)                                    \
  _ (0x41, 0xd4a, "ARM", "Neoverse-E1", 0)                                    \
  _ (0x43, 0x0a1, "Marvell", "THUNDERX CN88XX", 0)                            \
  _ (0x43, 0x0a2, "Marvell", "OCTEON TX CN81XX", 0)                           \
  _ (0x43, 0x0a3, "Marvell", "OCTEON TX CN83XX", 0)                           \
  _ (0x43, 0x0af, "Marvell", "THUNDERX2 CN99XX", 1)                           \
  _ (0x43, 0x0b1, "Marvell", "OCTEON TX2 CN98XX", 1)                          \
  _ (0x43, 0x0b2, "Marvell", "OCTEON TX2 CN96XX", 1)

__clib_export u8 *
format_cpu_uarch (u8 * s, va_list * args)
{
#if __x86_64__
  u32 __attribute__ ((unused)) eax, ebx, ecx, edx;
  u8 model, family, stepping;
  u8 amd_vendor = 0;

  if (__get_cpuid (0, &eax, &ebx, &ecx, &edx) == 0)
    return format (s, "unknown (missing cpuid)");

  if (amd_vendor (ebx, ecx, edx))
    amd_vendor = 1;

  if (__get_cpuid (1, &eax, &ebx, &ecx, &edx) == 0)
    return format (s, "unknown (missing cpuid)");

  stepping = eax & 0x0f;
  if (amd_vendor)
    {
      family = ((eax >> 8) & 0x0f);
      model = ((eax >> 4) & 0x0f);
      if (family >= 0xf)
	{
	  family = family + ((eax >> 20) & 0xf);
	  model = (model | ((eax >> 12) & 0xf0));
	}
      return format (s, "Zen (family 0x%02x model 0x%02x)", family, model);
    }
  else
    {
      model = ((eax >> 4) & 0x0f) | ((eax >> 12) & 0xf0);
      family = (eax >> 8) & 0x0f;
    }

#define _(f,m,a,c) if ((model == m) && (family == f)) return \
format(s, "[0x%x] %s ([0x%02x] %s) stepping 0x%x", f, a, m, c, stepping);
  foreach_x86_cpu_uarch
#undef _
    return format (s, "unknown (family 0x%02x model 0x%02x)", family, model);

#elif __aarch64__
  unformat_input_t input;
  u32 implementer, primary_part_number, variant, revision;

  if (unformat_init_file (&input, "/proc/cpuinfo"))
    {
      while (unformat_check_input (&input) != UNFORMAT_END_OF_INPUT)
	{
	  if (unformat (&input, "CPU implementer%_: 0x%x", &implementer))
	    ;
	  else if (unformat (&input, "CPU part%_: 0x%x", &primary_part_number))
	    ;
	  else if (unformat (&input, "CPU variant%_: 0x%x", &variant))
	    ;
	  else if (unformat (&input, "CPU revision%_: %u", &revision))
	    ;
	  else
	    unformat_skip_line (&input);
	}
      unformat_free (&input);
    }
  else
    return format (s, "unknown");

#define _(i,p,a,c,_format) if ((implementer == i) && (primary_part_number == p)){ \
	if (_format)\
	 return format(s, "%s (%s PASS %c%u)", a, c, 'A'+variant, revision);\
	 else {\
  if (implementer == 0x43)\
    variant++; \
  return format (s, "%s (%s PASS %u.%u)", a, c, variant, revision);}}

  foreach_aarch64_cpu_uarch
#undef _
    return format (s, "unknown (implementer 0x%02x part 0x%03x PASS %u.%u)",
		   implementer, primary_part_number, variant, revision);

#else /* ! __x86_64__ */
  return format (s, "unknown");
#endif
}

__clib_export u8 *
format_cpu_model_name (u8 * s, va_list * args)
{
#if __x86_64__
  u32 __attribute__ ((unused)) eax, ebx, ecx, edx;
  u8 *name = 0;
  u32 *name_u32;

  if (__get_cpuid (1, &eax, &ebx, &ecx, &edx) == 0)
    return format (s, "unknown (missing cpuid)");

  __get_cpuid (0x80000000, &eax, &ebx, &ecx, &edx);
  if (eax < 0x80000004)
    return format (s, "unknown (missing ext feature)");

  vec_validate (name, 48);
  name_u32 = (u32 *) name;

  __get_cpuid (0x80000002, &eax, &ebx, &ecx, &edx);
  name_u32[0] = eax;
  name_u32[1] = ebx;
  name_u32[2] = ecx;
  name_u32[3] = edx;

  __get_cpuid (0x80000003, &eax, &ebx, &ecx, &edx);
  name_u32[4] = eax;
  name_u32[5] = ebx;
  name_u32[6] = ecx;
  name_u32[7] = edx;

  __get_cpuid (0x80000004, &eax, &ebx, &ecx, &edx);
  name_u32[8] = eax;
  name_u32[9] = ebx;
  name_u32[10] = ecx;
  name_u32[11] = edx;

  s = format (s, "%s", name);
  vec_free (name);
  return s;

#elif defined(__aarch64__)
  return format (s, "armv8");
#else /* ! __x86_64__ */
  return format (s, "unknown");
#endif
}

#if defined(__x86_64__) || defined(__aarch64__)
static inline char const *
flag_skip_prefix (char const *flag, const char *pfx, int len)
{
  if (0 == strncmp (flag, pfx, len - 1))
    return flag + len - 1;
  return flag;
}
#endif

__clib_export u8 *
format_cpu_flags (u8 *s, va_list *args)
{
#if defined(__x86_64__)
#define _(flag, func, reg, bit)                                               \
  if (clib_cpu_supports_##flag ())                                            \
    s = format (s, "%s ", flag_skip_prefix (#flag, "x86_", sizeof ("x86_")));
  foreach_x86_64_flags return s;
#undef _
#elif defined(__aarch64__)
#define _(flag, bit)                                                          \
  if (clib_cpu_supports_##flag ())                                            \
    s = format (s, "%s ",                                                     \
		flag_skip_prefix (#flag, "aarch64_", sizeof ("aarch64_")));
  foreach_aarch64_flags return s;
#undef _
#else /* ! ! __x86_64__ && ! __aarch64__ */
  return format (s, "unknown");
#endif
}

__clib_export u32
clib_get_current_cpu_id ()
{
#ifdef __linux__
  unsigned cpu, node;
  syscall (__NR_getcpu, &cpu, &node, 0);
  return cpu;
#else
  return 0;
#endif /* __linux__ */
}

__clib_export u32
clib_get_current_numa_node ()
{
#ifdef __linux__
  unsigned cpu, node;
  syscall (__NR_getcpu, &cpu, &node, 0);
  return node;
#else
  return 0;
#endif /* __linux__ */
}

__clib_export u8 *
format_march_variant (u8 *s, va_list *args)
{
  clib_march_variant_type_t t = va_arg (*args, clib_march_variant_type_t);
  char *variants[] = { [0] = "default",
#define _(s, n) [CLIB_MARCH_VARIANT_TYPE_##s] = n,
		       foreach_march_variant
#undef _
  };
  return format (s, "%s", variants[t]);
}

#ifdef __aarch64__

__clib_export const clib_cpu_info_t *
clib_get_cpu_info ()
{
  static int first_run = 1;
  static clib_cpu_info_t info = {};
  if (first_run)
    {
      FILE *fp = fopen ("/proc/cpuinfo", "r");
      char buf[128];

      if (!fp)
	return 0;

      while (!feof (fp))
	{
	  if (!fgets (buf, sizeof (buf), fp))
	    break;
	  buf[127] = '\0';
	  if (strstr (buf, "CPU part"))
	    info.aarch64.part_num =
	      strtol (memchr (buf, ':', 128) + 2, NULL, 0);

	  if (strstr (buf, "CPU implementer"))
	    info.aarch64.implementer =
	      strtol (memchr (buf, ':', 128) + 2, NULL, 0);
	}
      fclose (fp);

      first_run = 0;
    }
  return &info;
}

#endif