[LinuxBIOS] Messing with CAR in a big way

[Carl-Daniel Hailfinger]

On 12.01.2008 02:23, ron minnich wrote:
> On Jan 11, 2008 5:10 PM, Carl-Daniel Hailfinger
> <c-d.hailfinger.devel.2006 at gmx.net> wrote:
>
>   
>> Do you want CAR to start at 0x80000 and end at 0x87FFF
>>     
>
> Oh shoot, I just realized, on LX it goes from 88000 to 88fff. But it
> doesn't matter that much. 80000 to 87fff is fine too.
>   

No problem, try this one:

Index: LinuxBIOSv2-myCAR/src/cpu/amd/car/cache_as_ram.inc
===================================================================
--- LinuxBIOSv2-myCAR/src/cpu/amd/car/cache_as_ram.inc	(Revision 3044)
+++ LinuxBIOSv2-myCAR/src/cpu/amd/car/cache_as_ram.inc	(Arbeitskopie)
@@ -19,7 +19,7 @@
  */
 
 #define CacheSize DCACHE_RAM_SIZE
-#define CacheBase (0xd0000 - CacheSize)
+#define CacheBase (0x90000 - CacheSize)
 
 /* leave some space for global variable to pass to RAM stage */
 #define GlobalVarSize DCACHE_RAM_GLOBAL_VAR_SIZE
@@ -181,6 +181,7 @@
 #error Invalid CAR size, is not a multiple of 4k. This is a processor limitation.
 #endif
 
+#if 0
 #if CacheSize > 0x8000 
         /* enable caching for 32K-64K using fixed mtrr */
         movl    $0x268, %ecx  /* fix4k_c0000*/
@@ -191,6 +192,14 @@
         /* enable caching for 0-32K using fixed mtrr */
         movl    $0x269, %ecx  /* fix4k_c8000*/
 	simplemask CacheSize, 0
+#endif
+#if CacheSize != 0x8000
+#error The new code wants CacheSize to be exactly 32k for now.
+#endif
+	/* Enable caching from 0x88000-0x8FFFF */
+	movl	$0x06060000, %eax
+	xorl	%edx, %edx
+	movl	$0x258, %ecx
 	wrmsr
 
 	/* enable memory access for first MBs using top_mem */