From: Graeme Russ <graeme.russ@gmail.com>
Date: Tue, 8 Nov 2011 02:33:21 +0000 (+0000)
Subject: x86: Ensure IDT and GDT remain 16-byte aligned post relocation
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=303418cc97c0922cdbbc328e6d9111bd9a84d1c7;p=u-boot.git

x86: Ensure IDT and GDT remain 16-byte aligned post relocation

Some CPUs have strict alignment requirements for these tables

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
---

diff --git a/arch/x86/cpu/interrupts.c b/arch/x86/cpu/interrupts.c
index e0075110f3..e0958eb67f 100644
--- a/arch/x86/cpu/interrupts.c
+++ b/arch/x86/cpu/interrupts.c
@@ -174,7 +174,7 @@ struct desc_ptr {
 	unsigned short segment;
 } __packed;
 
-struct idt_entry idt[256];
+struct idt_entry idt[256] __attribute__((aligned(16)));
 
 struct desc_ptr idt_ptr;
 
diff --git a/arch/x86/lib/board.c b/arch/x86/lib/board.c
index b4451795cc..244a02163c 100644
--- a/arch/x86/lib/board.c
+++ b/arch/x86/lib/board.c
@@ -161,19 +161,26 @@ gd_t *gd;
 
 static int calculate_relocation_address(void)
 {
-	void *text_start = &__text_start;
-	void *bss_end = &__bss_end;
-	void *dest_addr;
+	ulong text_start = (ulong)&__text_start;
+	ulong bss_end = (ulong)&__bss_end;
+	ulong dest_addr;
 	ulong rel_offset;
 
 	/* Calculate destination RAM Address and relocation offset */
-	dest_addr = (void *)gd->ram_size;
+	dest_addr = gd->ram_size;
 	dest_addr -= CONFIG_SYS_STACK_SIZE;
 	dest_addr -= (bss_end - text_start);
+
+	/*
+	 * Round destination address down to 16-byte boundary to keep
+	 * IDT and GDT 16-byte aligned
+	 */
+	dest_addr &= ~15;
+
 	rel_offset = dest_addr - text_start;
 
 	gd->start_addr_sp = gd->ram_size;
-	gd->relocaddr = (ulong)dest_addr;
+	gd->relocaddr = dest_addr;
 	gd->reloc_off = rel_offset;
 
 	return 0;