1 files changed, 133 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/zhaoxin.c b/arch/x86/kernel/cpu/zhaoxin.c
new file mode 100644
index 0000000000..05fa4ef634
--- /dev/null
+++ b/arch/x86/kernel/cpu/zhaoxin.c
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/sched.h>
+#include <linux/sched/clock.h>
+
+#include <asm/cpu.h>
+#include <asm/cpufeature.h>
+
+#include "cpu.h"
+
+#define MSR_ZHAOXIN_FCR57 0x00001257
+
+#define ACE_PRESENT	(1 << 6)
+#define ACE_ENABLED	(1 << 7)
+#define ACE_FCR		(1 << 7)	/* MSR_ZHAOXIN_FCR */
+
+#define RNG_PRESENT	(1 << 2)
+#define RNG_ENABLED	(1 << 3)
+#define RNG_ENABLE	(1 << 8)	/* MSR_ZHAOXIN_RNG */
+
+static void init_zhaoxin_cap(struct cpuinfo_x86 *c)
+{
+	u32  lo, hi;
+
+	/* Test for Extended Feature Flags presence */
+	if (cpuid_eax(0xC0000000) >= 0xC0000001) {
+		u32 tmp = cpuid_edx(0xC0000001);
+
+		/* Enable ACE unit, if present and disabled */
+		if ((tmp & (ACE_PRESENT | ACE_ENABLED)) == ACE_PRESENT) {
+			rdmsr(MSR_ZHAOXIN_FCR57, lo, hi);
+			/* Enable ACE unit */
+			lo |= ACE_FCR;
+			wrmsr(MSR_ZHAOXIN_FCR57, lo, hi);
+			pr_info("CPU: Enabled ACE h/w crypto\n");
+		}
+
+		/* Enable RNG unit, if present and disabled */
+		if ((tmp & (RNG_PRESENT | RNG_ENABLED)) == RNG_PRESENT) {
+			rdmsr(MSR_ZHAOXIN_FCR57, lo, hi);
+			/* Enable RNG unit */
+			lo |= RNG_ENABLE;
+			wrmsr(MSR_ZHAOXIN_FCR57, lo, hi);
+			pr_info("CPU: Enabled h/w RNG\n");
+		}
+
+		/*
+		 * Store Extended Feature Flags as word 5 of the CPU
+		 * capability bit array
+		 */
+		c->x86_capability[CPUID_C000_0001_EDX] = cpuid_edx(0xC0000001);
+	}
+
+	if (c->x86 >= 0x6)
+		set_cpu_cap(c, X86_FEATURE_REP_GOOD);
+}
+
+static void early_init_zhaoxin(struct cpuinfo_x86 *c)
+{
+	if (c->x86 >= 0x6)
+		set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
+#ifdef CONFIG_X86_64
+	set_cpu_cap(c, X86_FEATURE_SYSENTER32);
+#endif
+	if (c->x86_power & (1 << 8)) {
+		set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
+		set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
+	}
+
+	if (c->cpuid_level >= 0x00000001) {
+		u32 eax, ebx, ecx, edx;
+
+		cpuid(0x00000001, &eax, &ebx, &ecx, &edx);
+		/*
+		 * If HTT (EDX[28]) is set EBX[16:23] contain the number of
+		 * apicids which are reserved per package. Store the resulting
+		 * shift value for the package management code.
+		 */
+		if (edx & (1U << 28))
+			c->x86_coreid_bits = get_count_order((ebx >> 16) & 0xff);
+	}
+
+}
+
+static void init_zhaoxin(struct cpuinfo_x86 *c)
+{
+	early_init_zhaoxin(c);
+	init_intel_cacheinfo(c);
+	detect_num_cpu_cores(c);
+#ifdef CONFIG_X86_32
+	detect_ht(c);
+#endif
+
+	if (c->cpuid_level > 9) {
+		unsigned int eax = cpuid_eax(10);
+
+		/*
+		 * Check for version and the number of counters
+		 * Version(eax[7:0]) can't be 0;
+		 * Counters(eax[15:8]) should be greater than 1;
+		 */
+		if ((eax & 0xff) && (((eax >> 8) & 0xff) > 1))
+			set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
+	}
+
+	if (c->x86 >= 0x6)
+		init_zhaoxin_cap(c);
+#ifdef CONFIG_X86_64
+	set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
+#endif
+
+	init_ia32_feat_ctl(c);
+}
+
+#ifdef CONFIG_X86_32
+static unsigned int
+zhaoxin_size_cache(struct cpuinfo_x86 *c, unsigned int size)
+{
+	return size;
+}
+#endif
+
+static const struct cpu_dev zhaoxin_cpu_dev = {
+	.c_vendor	= "zhaoxin",
+	.c_ident	= { "  Shanghai  " },
+	.c_early_init	= early_init_zhaoxin,
+	.c_init		= init_zhaoxin,
+#ifdef CONFIG_X86_32
+	.legacy_cache_size = zhaoxin_size_cache,
+#endif
+	.c_x86_vendor	= X86_VENDOR_ZHAOXIN,
+};
+
+cpu_dev_register(zhaoxin_cpu_dev);