x86: Do CPU identification in the early phase

The CPU identification happens in x86_cpu_init_f() and corresponding
fields are saved in the global data for later use.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

2 files changed, 169 insertions, 4 deletions

diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h
index 6c6774af76..89b748b392 100644
--- a/arch/x86/include/asm/cpu.h
+++ b/arch/x86/include/asm/cpu.h
@@ -1,16 +1,160 @@
 /*
  * Copyright (c) 2014 The Chromium OS Authors.
  *
+ * Part of this file is adapted from coreboot
+ * src/arch/x86/include/arch/cpu.h and
+ * src/arch/x86/lib/cpu.c
+ *
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
-#ifndef __X86_CPU_H
-#define __X86_CPU_H
+#ifndef _ASM_CPU_H
+#define _ASM_CPU_H
+
+enum {
+	X86_VENDOR_INVALID = 0,
+	X86_VENDOR_INTEL,
+	X86_VENDOR_CYRIX,
+	X86_VENDOR_AMD,
+	X86_VENDOR_UMC,
+	X86_VENDOR_NEXGEN,
+	X86_VENDOR_CENTAUR,
+	X86_VENDOR_RISE,
+	X86_VENDOR_TRANSMETA,
+	X86_VENDOR_NSC,
+	X86_VENDOR_SIS,
+	X86_VENDOR_ANY = 0xfe,
+	X86_VENDOR_UNKNOWN = 0xff
+};
+
+struct cpuid_result {
+	uint32_t eax;
+	uint32_t ebx;
+	uint32_t ecx;
+	uint32_t edx;
+};
+
+/*
+ * Generic CPUID function
+ */
+static inline struct cpuid_result cpuid(int op)
+{
+	struct cpuid_result result;
+	asm volatile(
+		"mov %%ebx, %%edi;"
+		"cpuid;"
+		"mov %%ebx, %%esi;"
+		"mov %%edi, %%ebx;"
+		: "=a" (result.eax),
+		  "=S" (result.ebx),
+		  "=c" (result.ecx),
+		  "=d" (result.edx)
+		: "0" (op)
+		: "edi");
+	return result;
+}
+
+/*
+ * Generic Extended CPUID function
+ */
+static inline struct cpuid_result cpuid_ext(int op, unsigned ecx)
+{
+	struct cpuid_result result;
+	asm volatile(
+		"mov %%ebx, %%edi;"
+		"cpuid;"
+		"mov %%ebx, %%esi;"
+		"mov %%edi, %%ebx;"
+		: "=a" (result.eax),
+		  "=S" (result.ebx),
+		  "=c" (result.ecx),
+		  "=d" (result.edx)
+		: "0" (op), "2" (ecx)
+		: "edi");
+	return result;
+}
+
+/*
+ * CPUID functions returning a single datum
+ */
+static inline unsigned int cpuid_eax(unsigned int op)
+{
+	unsigned int eax;
+
+	__asm__("mov %%ebx, %%edi;"
+		"cpuid;"
+		"mov %%edi, %%ebx;"
+		: "=a" (eax)
+		: "0" (op)
+		: "ecx", "edx", "edi");
+	return eax;
+}
+
+static inline unsigned int cpuid_ebx(unsigned int op)
+{
+	unsigned int eax, ebx;
+
+	__asm__("mov %%ebx, %%edi;"
+		"cpuid;"
+		"mov %%ebx, %%esi;"
+		"mov %%edi, %%ebx;"
+		: "=a" (eax), "=S" (ebx)
+		: "0" (op)
+		: "ecx", "edx", "edi");
+	return ebx;
+}
+
+static inline unsigned int cpuid_ecx(unsigned int op)
+{
+	unsigned int eax, ecx;
 
- /**
+	__asm__("mov %%ebx, %%edi;"
+		"cpuid;"
+		"mov %%edi, %%ebx;"
+		: "=a" (eax), "=c" (ecx)
+		: "0" (op)
+		: "edx", "edi");
+	return ecx;
+}
+
+static inline unsigned int cpuid_edx(unsigned int op)
+{
+	unsigned int eax, edx;
+
+	__asm__("mov %%ebx, %%edi;"
+		"cpuid;"
+		"mov %%edi, %%ebx;"
+		: "=a" (eax), "=d" (edx)
+		: "0" (op)
+		: "ecx", "edi");
+	return edx;
+}
+
+/* Standard macro to see if a specific flag is changeable */
+static inline int flag_is_changeable_p(uint32_t flag)
+{
+	uint32_t f1, f2;
+
+	asm(
+		"pushfl\n\t"
+		"pushfl\n\t"
+		"popl %0\n\t"
+		"movl %0,%1\n\t"
+		"xorl %2,%0\n\t"
+		"pushl %0\n\t"
+		"popfl\n\t"
+		"pushfl\n\t"
+		"popl %0\n\t"
+		"popfl\n\t"
+		: "=&r" (f1), "=&r" (f2)
+		: "ir" (flag));
+	return ((f1^f2) & flag) != 0;
+}
+
+/**
  * cpu_enable_paging_pae() - Enable PAE-paging
  *
- * @pdpt:	Value to set in cr3 (PDPT or PML4T)
+ * @cr3:	Value to set in cr3 (PDPT or PML4T)
  */
 void cpu_enable_paging_pae(ulong cr3);
 
@@ -27,6 +171,22 @@ void cpu_disable_paging_pae(void);
 int cpu_has_64bit(void);
 
 /**
+ * cpu_vendor_name() - Get CPU vendor name
+ *
+ * @vendor:	CPU vendor enumeration number
+ *
+ * @return:	Address to hold the CPU vendor name string
+ */
+const char *cpu_vendor_name(int vendor);
+
+/**
+ * fill_processor_name() - Get processor name
+ *
+ * @processor_name:	Address to hold the processor name string
+ */
+void fill_processor_name(char *processor_name);
+
+/**
  * cpu_call64() - Jump to a 64-bit Linux kernel (internal function)
  *
  * The kernel is uncompressed and the 64-bit entry point is expected to be
diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h
index 9eae228677..3e3073ae5c 100644
--- a/arch/x86/include/asm/global_data.h
+++ b/arch/x86/include/asm/global_data.h
@@ -13,6 +13,11 @@
 /* Architecture-specific global data */
 struct arch_global_data {
 	struct global_data *gd_addr;		/* Location of Global Data */
+	uint8_t  x86;			/* CPU family */
+	uint8_t  x86_vendor;		/* CPU vendor */
+	uint8_t  x86_model;
+	uint8_t  x86_mask;
+	uint32_t x86_device;
 	uint64_t tsc_base;		/* Initial value returned by rdtsc() */
 	uint32_t tsc_base_kclocks;	/* Initial tsc as a kclocks value */
 	uint32_t tsc_prev;		/* For show_boot_progress() */