arch/x86/kernel/cpu/zhaoxin.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/sched.h>
   3 #include <linux/sched/clock.h>
   4
   5 #include <asm/cpu.h>
   6 #include <asm/cpufeature.h>
   7
   8 #include "cpu.h"
   9
  10 #define MSR_ZHAOXIN_FCR57 0x00001257
  11
  12 #define ACE_PRESENT     (1 << 6)
  13 #define ACE_ENABLED     (1 << 7)
  14 #define ACE_FCR         (1 << 7)        /* MSR_ZHAOXIN_FCR */
  15
  16 #define RNG_PRESENT     (1 << 2)
  17 #define RNG_ENABLED     (1 << 3)
  18 #define RNG_ENABLE      (1 << 8)        /* MSR_ZHAOXIN_RNG */
  19
  20 static void init_zhaoxin_cap(struct cpuinfo_x86 *c)
  21 {
  22         u32  lo, hi;
  23
  24         /* Test for Extended Feature Flags presence */
  25         if (cpuid_eax(0xC0000000) >= 0xC0000001) {
  26                 u32 tmp = cpuid_edx(0xC0000001);
  27
  28                 /* Enable ACE unit, if present and disabled */
  29                 if ((tmp & (ACE_PRESENT | ACE_ENABLED)) == ACE_PRESENT) {
  30                         rdmsr(MSR_ZHAOXIN_FCR57, lo, hi);
  31                         /* Enable ACE unit */
  32                         lo |= ACE_FCR;
  33                         wrmsr(MSR_ZHAOXIN_FCR57, lo, hi);
  34                         pr_info("CPU: Enabled ACE h/w crypto\n");
  35                 }
  36
  37                 /* Enable RNG unit, if present and disabled */
  38                 if ((tmp & (RNG_PRESENT | RNG_ENABLED)) == RNG_PRESENT) {
  39                         rdmsr(MSR_ZHAOXIN_FCR57, lo, hi);
  40                         /* Enable RNG unit */
  41                         lo |= RNG_ENABLE;
  42                         wrmsr(MSR_ZHAOXIN_FCR57, lo, hi);
  43                         pr_info("CPU: Enabled h/w RNG\n");
  44                 }
  45
  46                 /*
  47                  * Store Extended Feature Flags as word 5 of the CPU
  48                  * capability bit array
  49                  */
  50                 c->x86_capability[CPUID_C000_0001_EDX] = cpuid_edx(0xC0000001);
  51         }
  52
  53         if (c->x86 >= 0x6)
  54                 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
  55 }
  56
  57 static void early_init_zhaoxin(struct cpuinfo_x86 *c)
  58 {
  59         if (c->x86 >= 0x6)
  60                 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
  61 #ifdef CONFIG_X86_64
  62         set_cpu_cap(c, X86_FEATURE_SYSENTER32);
  63 #endif
  64         if (c->x86_power & (1 << 8)) {
  65                 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
  66                 set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
  67         }
  68 }
  69
  70 static void init_zhaoxin(struct cpuinfo_x86 *c)
  71 {
  72         early_init_zhaoxin(c);
  73         init_intel_cacheinfo(c);
  74
  75         if (c->cpuid_level > 9) {
  76                 unsigned int eax = cpuid_eax(10);
  77
  78                 /*
  79                  * Check for version and the number of counters
  80                  * Version(eax[7:0]) can't be 0;
  81                  * Counters(eax[15:8]) should be greater than 1;
  82                  */
  83                 if ((eax & 0xff) && (((eax >> 8) & 0xff) > 1))
  84                         set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
  85         }
  86
  87         if (c->x86 >= 0x6)
  88                 init_zhaoxin_cap(c);
  89 #ifdef CONFIG_X86_64
  90         set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
  91 #endif
  92
  93         init_ia32_feat_ctl(c);
  94 }
  95
  96 #ifdef CONFIG_X86_32
  97 static unsigned int
  98 zhaoxin_size_cache(struct cpuinfo_x86 *c, unsigned int size)
  99 {
 100         return size;
 101 }
 102 #endif
 103
 104 static const struct cpu_dev zhaoxin_cpu_dev = {
 105         .c_vendor       = "zhaoxin",
 106         .c_ident        = { "  Shanghai  " },
 107         .c_early_init   = early_init_zhaoxin,
 108         .c_init         = init_zhaoxin,
 109 #ifdef CONFIG_X86_32
 110         .legacy_cache_size = zhaoxin_size_cache,
 111 #endif
 112         .c_x86_vendor   = X86_VENDOR_ZHAOXIN,
 113 };
 114
 115 cpu_dev_register(zhaoxin_cpu_dev);