cpu/x86: Rename __protected_start symbol

It was confusing to have this defined while there was another
symbol bootblock_protected_mode_entry that was not really used
as an entry point.

Change-Id: I3da07ba9c0a9fc15b1515452adfb27f963659951
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48404
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Jason Glenesk <jason.glenesk@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/x86/entry16.S

@@ -125,7 +125,7 @@ _start16bit:
 	movl	%ebp, %eax
 
 	/* Now that we are in protected mode jump to a 32 bit code segment. */
-	ljmpl	$ROM_CODE_SEG, $__protected_start
+	ljmpl	$ROM_CODE_SEG, $bootblock_protected_mode_entry
 
 	/**
 	 * The gdt is defined in gdt_init.S, it has a 4 Gb code segment

src/cpu/x86/entry32.S

@@ -25,8 +25,9 @@
  */
 	.align	4
 
-.globl __protected_start
-__protected_start:
+.globl bootblock_protected_mode_entry
+bootblock_protected_mode_entry:
+
 	/* Save the BIST value */
 	movl	%eax, %ebp
 
@@ -54,14 +55,14 @@ debug_spinloop:
 	jz	debug_spinloop
 #endif
 
-bootblock_protected_mode_entry:
-
 #if !CONFIG(USE_MARCH_586)
 	/* MMX registers required here */
 
 	/* BIST result in eax */
 	movd	%eax, %mm0
 
+__timestamp:
+
 	/* Get an early timestamp */
 	rdtsc
 	movd	%eax, %mm1

src/drivers/amd/agesa/cache_as_ram.S

@@ -26,7 +26,7 @@ _cache_as_ram_setup:
 /*
  * on entry:
  *   mm0: BIST (ignored)
- *   mm2_mm1: timestamp at bootblock_protected_mode_entry
+ *   mm2_mm1: timestamp
  */
 bootblock_pre_c_entry:
 

src/soc/amd/common/block/cpu/car/cache_as_ram.S

@@ -21,7 +21,7 @@ _cache_as_ram_setup:
 /*
  * on entry:
  *   mm0: BIST (ignored)
- *   mm2_mm1: timestamp at bootblock_protected_mode_entry
+ *   mm2_mm1: timestamp
  */
 
 .global bootblock_pre_c_entry

src/soc/amd/common/block/cpu/noncar/pre_c.S

@@ -18,7 +18,7 @@ bootblock_resume_entry:
 /*
  * on entry:
  *   mm0: BIST (ignored)
- *   mm2_mm1: timestamp at bootblock_protected_mode_entry
+ *   mm2_mm1: timestamp
  */
 
 .global bootblock_pre_c_entry