[XS] Change in coreboot[main]: soc/intel/common/block/cpu: Fix ways count computation regression

[Jérémy Compostella (Code Review)]

Jérémy Compostella has posted comments on this change by Jérémy Compostella. ( https://review.coreboot.org/c/coreboot/+/83948?usp=email )

Change subject: soc/intel/common/block/cpu: Fix ways count computation regression
......................................................................

Patch Set 11:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/83948/comment/396eabff_c2d26a68?usp... :
PS11, Line 32: TEST=Verified on PTL Intel reference platform
> I performed the following experiment: […]

Sorry, I though the question was for https://review.coreboot.org/c/coreboot/+/83946/10.

To verify this particular issue, I use a configuration with `CONFIG_DCACHE_RAM_SIZE > Effective way size` and then there a couple of options to observe the bug/fix:
1. Use a debugger, run a step by step and look at the registers
2. Dump some register using the post_code() macro in the algorithm

I used #2 as it was faster for me. I created the following temporary macro for this purpose.

```
modified   src/include/cpu/x86/post_code.h
@@ -9,7 +9,25 @@
 #define post_code(value)        \
    movb    $value, %al;    \
    outb    %al, $CONFIG_POST_IO_PORT
-
+#define post_code_safe(value, backup)      \
+	mov     %eax, backup;              \
+	movb    $value, %al;               \
+	outb    %al, $CONFIG_POST_IO_PORT; \
+	mov     backup, %eax;
+#define dump_register(reg, backup)	   \
+	mov     %eax, backup;              \
+        movb    $0xa, %al;                 \
+	outb    %al, $CONFIG_POST_IO_PORT; \
+        mov     backup, %eax;              \
+	mov     reg, %eax;                 \
+	outb    %al, $CONFIG_POST_IO_PORT; \
+	shrl    $8, %eax;                  \
+	outb    %al, $CONFIG_POST_IO_PORT; \
+	shrl    $8, %eax;                  \
+	outb    %al, $CONFIG_POST_IO_PORT; \
+	shrl    $8, %eax;                  \
+	outb    %al, $CONFIG_POST_IO_PORT; \
+	mov     backup, %eax;
 #else
 #define post_code(value)
```