1 files changed, 128 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/microcode/internal.h b/arch/x86/kernel/cpu/microcode/internal.h
new file mode 100644
index 000000000000..21776c529fa9
--- /dev/null
+++ b/arch/x86/kernel/cpu/microcode/internal.h
@@ -0,0 +1,128 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _X86_MICROCODE_INTERNAL_H
+#define _X86_MICROCODE_INTERNAL_H
+
+#include <linux/earlycpio.h>
+#include <linux/initrd.h>
+
+#include <asm/cpu.h>
+#include <asm/microcode.h>
+
+struct device;
+
+enum ucode_state {
+	UCODE_OK	= 0,
+	UCODE_NEW,
+	UCODE_NEW_SAFE,
+	UCODE_UPDATED,
+	UCODE_NFOUND,
+	UCODE_ERROR,
+	UCODE_TIMEOUT,
+	UCODE_OFFLINE,
+};
+
+struct microcode_ops {
+	enum ucode_state (*request_microcode_fw)(int cpu, struct device *dev);
+	void (*microcode_fini_cpu)(int cpu);
+
+	/*
+	 * The generic 'microcode_core' part guarantees that the callbacks
+	 * below run on a target CPU when they are being called.
+	 * See also the "Synchronization" section in microcode_core.c.
+	 */
+	enum ucode_state	(*apply_microcode)(int cpu);
+	int			(*collect_cpu_info)(int cpu, struct cpu_signature *csig);
+	void			(*finalize_late_load)(int result);
+	unsigned int		nmi_safe	: 1,
+				use_nmi		: 1;
+};
+
+struct early_load_data {
+	u32 old_rev;
+	u32 new_rev;
+};
+
+extern struct early_load_data early_data;
+extern struct ucode_cpu_info ucode_cpu_info[];
+struct cpio_data find_microcode_in_initrd(const char *path);
+
+#define MAX_UCODE_COUNT 128
+
+#define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24))
+#define CPUID_INTEL1 QCHAR('G', 'e', 'n', 'u')
+#define CPUID_INTEL2 QCHAR('i', 'n', 'e', 'I')
+#define CPUID_INTEL3 QCHAR('n', 't', 'e', 'l')
+#define CPUID_AMD1 QCHAR('A', 'u', 't', 'h')
+#define CPUID_AMD2 QCHAR('e', 'n', 't', 'i')
+#define CPUID_AMD3 QCHAR('c', 'A', 'M', 'D')
+
+#define CPUID_IS(a, b, c, ebx, ecx, edx)	\
+		(!(((ebx) ^ (a)) | ((edx) ^ (b)) | ((ecx) ^ (c))))
+
+/*
+ * In early loading microcode phase on BSP, boot_cpu_data is not set up yet.
+ * x86_cpuid_vendor() gets vendor id for BSP.
+ *
+ * In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify
+ * coding, we still use x86_cpuid_vendor() to get vendor id for AP.
+ *
+ * x86_cpuid_vendor() gets vendor information directly from CPUID.
+ */
+static inline int x86_cpuid_vendor(void)
+{
+	u32 eax = 0x00000000;
+	u32 ebx, ecx = 0, edx;
+
+	native_cpuid(&eax, &ebx, &ecx, &edx);
+
+	if (CPUID_IS(CPUID_INTEL1, CPUID_INTEL2, CPUID_INTEL3, ebx, ecx, edx))
+		return X86_VENDOR_INTEL;
+
+	if (CPUID_IS(CPUID_AMD1, CPUID_AMD2, CPUID_AMD3, ebx, ecx, edx))
+		return X86_VENDOR_AMD;
+
+	return X86_VENDOR_UNKNOWN;
+}
+
+static inline unsigned int x86_cpuid_family(void)
+{
+	u32 eax = 0x00000001;
+	u32 ebx, ecx = 0, edx;
+
+	native_cpuid(&eax, &ebx, &ecx, &edx);
+
+	return x86_family(eax);
+}
+
+extern bool dis_ucode_ldr;
+extern bool force_minrev;
+
+#ifdef CONFIG_CPU_SUP_AMD
+void load_ucode_amd_bsp(struct early_load_data *ed, unsigned int family);
+void load_ucode_amd_ap(unsigned int family);
+int save_microcode_in_initrd_amd(unsigned int family);
+void reload_ucode_amd(unsigned int cpu);
+struct microcode_ops *init_amd_microcode(void);
+void exit_amd_microcode(void);
+#else /* CONFIG_CPU_SUP_AMD */
+static inline void load_ucode_amd_bsp(struct early_load_data *ed, unsigned int family) { }
+static inline void load_ucode_amd_ap(unsigned int family) { }
+static inline int save_microcode_in_initrd_amd(unsigned int family) { return -EINVAL; }
+static inline void reload_ucode_amd(unsigned int cpu) { }
+static inline struct microcode_ops *init_amd_microcode(void) { return NULL; }
+static inline void exit_amd_microcode(void) { }
+#endif /* !CONFIG_CPU_SUP_AMD */
+
+#ifdef CONFIG_CPU_SUP_INTEL
+void load_ucode_intel_bsp(struct early_load_data *ed);
+void load_ucode_intel_ap(void);
+void reload_ucode_intel(void);
+struct microcode_ops *init_intel_microcode(void);
+#else /* CONFIG_CPU_SUP_INTEL */
+static inline void load_ucode_intel_bsp(struct early_load_data *ed) { }
+static inline void load_ucode_intel_ap(void) { }
+static inline void reload_ucode_intel(void) { }
+static inline struct microcode_ops *init_intel_microcode(void) { return NULL; }
+#endif  /* !CONFIG_CPU_SUP_INTEL */
+
+#endif /* _X86_MICROCODE_INTERNAL_H */