[PATCH kvm-unit-tests 5/9] x86: Move IDT to desc.c

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Move the IDT data structures from x86/cstart.S and x86/cstart64.S to
lib/x86/desc.c, so that the follow-up UEFI support commits can reuse
these definitions, without re-defining them in UEFI's boot up assembly
code.

Extracted by a patch by Zixuan Wang <zxwang42@xxxxxxxxx> and ported
to 32-bit too.

Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
 lib/x86/desc.c | 10 ++++++++++
 x86/cstart.S   | 11 -----------
 x86/cstart64.S | 14 --------------
 3 files changed, 10 insertions(+), 25 deletions(-)

diff --git a/lib/x86/desc.c b/lib/x86/desc.c
index 94f0ddb..2ef5aad 100644
--- a/lib/x86/desc.c
+++ b/lib/x86/desc.c
@@ -3,6 +3,16 @@
 #include "processor.h"
 #include <setjmp.h>
 
+/* Boot-related data structures */
+
+/* IDT and IDT descriptor */
+idt_entry_t boot_idt[256] = {0};
+
+struct descriptor_table_ptr idt_descr = {
+	.limit = sizeof(boot_idt) - 1,
+	.base = (unsigned long)boot_idt,
+};
+
 #ifndef __x86_64__
 __attribute__((regparm(1)))
 #endif
diff --git a/x86/cstart.S b/x86/cstart.S
index bcf7218..4461c38 100644
--- a/x86/cstart.S
+++ b/x86/cstart.S
@@ -1,7 +1,6 @@
 
 #include "apic-defs.h"
 
-.globl boot_idt
 .global online_cpus
 
 ipi_vector = 0x20
@@ -28,12 +27,6 @@ i = 0
         i = i + 1
         .endr
 
-boot_idt:
-	.rept 256
-	.quad 0
-	.endr
-end_boot_idt:
-
 .globl gdt32
 gdt32:
 	.quad 0
@@ -78,10 +71,6 @@ tss:
         .endr
 tss_end:
 
-idt_descr:
-	.word end_boot_idt - boot_idt - 1
-	.long boot_idt
-
 .section .init
 
 .code32
diff --git a/x86/cstart64.S b/x86/cstart64.S
index cf38bae..b98a0d3 100644
--- a/x86/cstart64.S
+++ b/x86/cstart64.S
@@ -1,9 +1,6 @@
 
 #include "apic-defs.h"
 
-.globl boot_idt
-
-.globl idt_descr
 .globl gdt64_desc
 .globl online_cpus
 .globl cpu_online_count
@@ -50,13 +47,6 @@ ptl5:
 
 .align 4096
 
-boot_idt:
-	.rept 256
-	.quad 0
-	.quad 0
-	.endr
-end_boot_idt:
-
 gdt64_desc:
 	.word gdt64_end - gdt64 - 1
 	.quad gdt64
@@ -290,10 +280,6 @@ setup_5level_page_table:
 lvl5:
 	retq
 
-idt_descr:
-	.word end_boot_idt - boot_idt - 1
-	.quad boot_idt
-
 online_cpus:
 	.fill (max_cpus + 7) / 8, 1, 0
 
-- 
2.27.0





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