[coreboot] [v2] r4218 - trunk/coreboot-v2/src/cpu/via/car

[svn at coreboot.org]

Author: oxygene
Date: 2009-04-27 20:26:43 +0200 (Mon, 27 Apr 2009)
New Revision: 4218

Modified:
   trunk/coreboot-v2/src/cpu/via/car/cache_as_ram_post.c
Log:
Create a valid stack pointer after leaving CAR, so function calls don't
reset the machine in the small window between CAR and coreboot_ram.

Signed-off-by: Patrick Georgi <patrick.georgi at coresystems.de>
Acked-by: Myles Watson <mylesgw at gmail.com>


Modified: trunk/coreboot-v2/src/cpu/via/car/cache_as_ram_post.c
===================================================================
--- trunk/coreboot-v2/src/cpu/via/car/cache_as_ram_post.c	2009-04-27 16:08:26 UTC (rev 4217)
+++ trunk/coreboot-v2/src/cpu/via/car/cache_as_ram_post.c	2009-04-27 18:26:43 UTC (rev 4218)
@@ -99,8 +99,11 @@
         "movl    %eax, %cr0\n\t"
 	 			"invd\n\t"
 
-	/* 
-	FIXME: I hope we don't need to change esp and ebp value here, so we can restore value from mmx sse back
-		But the problem is the range is some io related, So don't go back
-	*/
+	/* FIXME: These values might have to change for suspend-to-ram.
+	   the 0x00400000 was chosen as this is a place in memory that
+	   should exist in all contemporary configurations (ie. large
+	   enough RAM), but doesn't collide with anything coreboot does.
+	   Other than that, it's arbitrary. */
+	"movl	$0x00400000,%esp\n\t"
+	"movl	%esp,%ebp\n\t"
         );