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); 116