X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=arch%2Fx86%2Finclude%2Fasm%2Fcpu.h;h=c70183ccefffba8effd9fdb080210328285b03a3;hb=9bf727fcc4743d06ba665f104e951b47f5029d56;hp=6c6774af76c8142d6aaf5af16bcd4c38c5fa1bb2;hpb=c88eaea0a0a809884388c3a5727d960bac0b0ced;p=oweals%2Fu-boot.git

diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h
index 6c6774af76..c70183ccef 100644
--- a/arch/x86/include/asm/cpu.h
+++ b/arch/x86/include/asm/cpu.h
@@ -1,16 +1,183 @@
 /*
  * 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
+};
+
+/* Global descriptor table (GDT) bits */
+enum {
+	GDT_4KB			= 1ULL << 55,
+	GDT_32BIT		= 1ULL << 54,
+	GDT_LONG		= 1ULL << 53,
+	GDT_PRESENT		= 1ULL << 47,
+	GDT_NOTSYS		= 1ULL << 44,
+	GDT_CODE		= 1ULL << 43,
+	GDT_LIMIT_LOW_SHIFT	= 0,
+	GDT_LIMIT_LOW_MASK	= 0xffff,
+	GDT_LIMIT_HIGH_SHIFT	= 48,
+	GDT_LIMIT_HIGH_MASK	= 0xf,
+	GDT_BASE_LOW_SHIFT	= 16,
+	GDT_BASE_LOW_MASK	= 0xffff,
+	GDT_BASE_HIGH_SHIFT	= 56,
+	GDT_BASE_HIGH_MASK	= 0xf,
+};
+
+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;
+}
+
+static inline void mfence(void)
+{
+	__asm__ __volatile__("mfence" : : : "memory");
+}
+
+/**
  * 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);
 
@@ -26,6 +193,27 @@ 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);
+
+#define CPU_MAX_NAME_LEN	49
+
+/**
+ * cpu_get_name() - Get the name of the current cpu
+ *
+ * @name: Place to put name, which must be CPU_MAX_NAME_LEN bytes including
+ * @return pointer to name, which will likely be a few bytes after the start
+ * of @name
+ * \0 terminator
+ */
+char *cpu_get_name(char *name);
+
 /**
  * cpu_call64() - Jump to a 64-bit Linux kernel (internal function)
  *
@@ -41,6 +229,15 @@ int cpu_has_64bit(void);
  */
 void cpu_call64(ulong pgtable, ulong setup_base, ulong target);
 
+/**
+ * cpu_call32() - Jump to a 32-bit entry point
+ *
+ * @code_seg32:	32-bit code segment to use (GDT offset, e.g. 0x20)
+ * @target:	Pointer to the start of the 32-bit U-Boot image/entry point
+ * @table:	Pointer to start of info table to pass to U-Boot
+ */
+void cpu_call32(ulong code_seg32, ulong target, ulong table);
+
 /**
  * cpu_jump_to_64bit() - Jump to a 64-bit Linux kernel
  *