support HDT disassembly when cache as ram auto stage

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2143 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/cpu/amd/car/cache_as_ram.inc

@@ -1,5 +1,6 @@
 /* by yhlu 6.2005 */
-/* We will use 4K bytes only */
+/* yhlu 2005.12 make it support HDT Memory Debuggers with Disassmbly, please select the PCI Bus mem for Phys Type*/
+/* We may need 4K bytes only */
 #define CacheSize DCACHE_RAM_SIZE
 #define CacheBase (0xd0000 - CacheSize)
 
@@ -12,9 +13,9 @@
 	/*for normal part %ebx already contain cpu_init_detected from fallback call */
 
 cache_as_ram_setup:
+
 	/* hope we can skip the double set for normal part */
 #if USE_FALLBACK_IMAGE == 1
-
 	/* check if cpu_init_detected */
 	movl	$MTRRdefType_MSR, %ecx
 	rdmsr
@@ -22,9 +23,6 @@ cache_as_ram_setup:
 	movl %eax, %ebx  /* We store the status */
 	
 	/* Set MtrrFixDramModEn for clear fixed mtrr */
-	xorl	%eax, %eax			
-	xorl	%edx, %edx			
-
 enable_fixed_mtrr_dram_modify:
 	movl	$SYSCFG_MSR, %ecx
 	rdmsr
@@ -32,13 +30,6 @@ enable_fixed_mtrr_dram_modify:
 	orl	$SYSCFG_MSR_MtrrFixDramModEn, %eax
 	wrmsr
 
-        /* Set the default memory type and enable fixed and variable MTRRs */
-        movl    $MTRRdefType_MSR, %ecx
-        xorl    %edx, %edx
-        /* Enable Variable and Fixed MTRRs */
-        movl    $0x00000c00, %eax
-        wrmsr
-
 	/*Clear all MTRRs */
 
 	xorl    %edx, %edx
@@ -55,12 +46,6 @@ clear_fixed_var_mtrr:
         jmp     clear_fixed_var_mtrr
 clear_fixed_var_mtrr_out:
 
-        /* Enable the MTRRs and IORRs in SYSCFG */
-        movl    $SYSCFG_MSR, %ecx
-        rdmsr
-        orl     $(SYSCFG_MSR_MtrrVarDramEn | SYSCFG_MSR_MtrrFixDramEn), %eax
-        wrmsr
-
 #if CacheSize == 0x10000 
         /* enable caching for 64K using fixed mtrr */
         movl    $0x268, %ecx  /* fix4k_c0000*/
@@ -69,7 +54,7 @@ clear_fixed_var_mtrr_out:
         wrmsr
 	movl	$0x269, %ecx
 	wrmsr
-#endif
+#else
 
   #if CacheSize == 0x8000
         /* enable caching for 32K using fixed mtrr */
@@ -77,7 +62,7 @@ clear_fixed_var_mtrr_out:
         movl    $0x06060606, %eax /* WB IO type */
 	movl    %eax, %edx
 	wrmsr
-#endif
+  #else
 
         /* enable caching for 16K/8K/4K using fixed mtrr */
         movl    $0x269, %ecx  /* fix4k_cc000*/
@@ -92,8 +77,11 @@ clear_fixed_var_mtrr_out:
     #endif
 	xorl    %eax, %eax
 	wrmsr
+  #endif
 
-        /* enable memory access for 0 - 1MB using top_mem */
+#endif
+
+        /* enable memory access for first MBs using top_mem */
         movl    $TOP_MEM, %ecx
         xorl    %edx, %edx
         movl    $(((CONFIG_LB_MEM_TOPK << 10) + TOP_MEM_MASK) & ~TOP_MEM_MASK) , %eax
@@ -101,7 +89,6 @@ clear_fixed_var_mtrr_out:
 #endif /*  USE_FALLBACK_IMAGE == 1*/
 
 #if USE_FALLBACK_IMAGE == 0
-
         /* disable cache */
         movl    %cr0, %eax
         orl    $(0x1<<30),%eax
@@ -119,11 +106,26 @@ clear_fixed_var_mtrr_out:
         wrmsr
 
         movl    $0x203, %ecx
-        movl    $0x0000000f, %edx
+        movl    $0x0000000f, %edx  /* AMD 40 bit */
         movl    $(~(XIP_ROM_SIZE - 1) | 0x800), %eax
         wrmsr
 #endif /* XIP_ROM_SIZE && XIP_ROM_BASE */
 
+#if USE_FALLBACK_IMAGE == 1
+        /* Set the default memory type and enable fixed and variable MTRRs */
+        movl    $MTRRdefType_MSR, %ecx
+        xorl    %edx, %edx
+        /* Enable Variable and Fixed MTRRs */
+        movl    $0x00000c00, %eax
+        wrmsr
+
+        /* Enable the MTRRs and IORRs in SYSCFG */
+        movl    $SYSCFG_MSR, %ecx
+        rdmsr
+        orl     $(SYSCFG_MSR_MtrrVarDramEn | SYSCFG_MSR_MtrrFixDramEn), %eax
+        wrmsr
+#endif
+
         /* enable cache */
         movl    %cr0, %eax
         andl    $0x9fffffff,%eax
@@ -132,23 +134,22 @@ clear_fixed_var_mtrr_out:
 #if USE_FALLBACK_IMAGE == 1
 
         /* Read the range with lodsl*/
-        movl    $(CacheBase+CacheSize-4), %esi
+	cld
-        std
+        movl    $CacheBase, %esi
         movl    $(CacheSize>>2), %ecx
         rep     lodsl
         /* Clear the range */
-        movl    $(CacheBase+CacheSize-4), %edi
+        movl    $CacheBase, %edi
         movl    $(CacheSize>>2), %ecx
         xorl    %eax, %eax
         rep     stosl
 
 #endif /*USE_FALLBACK_IMAGE == 1*/
 
-
+	/* set up the stack pointer */
 	movl	$(CacheBase+CacheSize-4), %eax
 	movl    %eax, %esp
 
-
 	/* Restore the BIST result */
 	movl    %ebp, %eax
 	/* We need to set ebp ? No need */