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x86: Add an enum for some commonly-used GDT bits

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Rather than add these as open-coded values, create an enum with the commonly
used flags.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2015-08-04 12:33:54 -06:00
parent b997abd3f0
commit 7dfe8bdeef
1 changed files with 18 additions and 0 deletions
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18
arch/x86/include/asm/cpu.h
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@@ -27,6 +27,24 @@ enum {
X86_VENDOR_UNKNOWN = 0xff 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 { struct cpuid_result {
uint32_t eax; uint32_t eax;
uint32_t ebx; uint32_t ebx;