From 7dfe8bdeef7f8a7223fb39e04faaa5c7489feb3f Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Tue, 4 Aug 2015 12:33:54 -0600 Subject: [PATCH] x86: Add an enum for some commonly-used GDT bits Rather than add these as open-coded values, create an enum with the commonly used flags. Signed-off-by: Simon Glass Reviewed-by: Bin Meng --- arch/x86/include/asm/cpu.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h index 08284ee..5b89139 100644 --- a/arch/x86/include/asm/cpu.h +++ b/arch/x86/include/asm/cpu.h @@ -27,6 +27,24 @@ enum { 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; -- 2.7.4