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Subject[PATCH v2 5/9] x86/desc: add native_[ig]dt_invalidate() to <asm/desc.h>
Date
From: "H. Peter Anvin (Intel)" <hpa@zytor.com>

In some places, we want the native forms of descriptor table
invalidation. Rather than open-coding them, add explicitly native
functions to invalidate the GDT and IDT.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
---
arch/x86/include/asm/desc.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h
index b8429ae50b71..aa366b2bbc41 100644
--- a/arch/x86/include/asm/desc.h
+++ b/arch/x86/include/asm/desc.h
@@ -224,6 +224,21 @@ static inline void store_idt(struct desc_ptr *dtr)
asm volatile("sidt %0":"=m" (*dtr));
}

+static const struct desc_ptr __invalid_gdt_idt_ptr __maybe_unused = {
+ .address = 0,
+ .size = 0
+};
+
+static inline void native_gdt_invalidate(void)
+{
+ native_load_gdt(&__invalid_gdt_idt_ptr);
+}
+
+static inline void native_idt_invalidate(void)
+{
+ native_load_idt(&__invalid_gdt_idt_ptr);
+}
+
/*
* The LTR instruction marks the TSS GDT entry as busy. On 64-bit, the GDT is
* a read-only remapping. To prevent a page fault, the GDT is switched to the
--
2.31.1
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