From 18739e2ccc66e13dba10a7cb4578910daf455f01 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Fri, 14 Nov 2014 18:18:43 -0700 Subject: x86: Add Intel speedstep and turbo mode code Intel chips have a turbo mode where they can run faster for a short period until they reach thermal limits. Add code to adjust and query this feature. Signed-off-by: Simon Glass --- arch/x86/include/asm/turbo.h | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 arch/x86/include/asm/turbo.h (limited to 'arch/x86/include/asm/turbo.h') diff --git a/arch/x86/include/asm/turbo.h b/arch/x86/include/asm/turbo.h new file mode 100644 index 0000000..bb0d4b4 --- /dev/null +++ b/arch/x86/include/asm/turbo.h @@ -0,0 +1,31 @@ +/* + * From coreboot file of the same name + * + * Copyright (C) 2011 The ChromiumOS Authors. All rights reserved. + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#ifndef _ASM_TURBO_H +#define _ASM_TURBO_H + +#define CPUID_LEAF_PM 6 +#define PM_CAP_TURBO_MODE (1 << 1) + +#define MSR_IA32_MISC_ENABLES 0x1a0 +#define H_MISC_DISABLE_TURBO (1 << 6) + +enum { + TURBO_UNKNOWN, + TURBO_UNAVAILABLE, + TURBO_DISABLED, + TURBO_ENABLED, +}; + +/* Return current turbo state */ +int turbo_get_state(void); + +/* Enable turbo */ +void turbo_enable(void); + +#endif -- cgit v1.1