svn commit: r278702 - stable/10/sys/arm/arm

[Ian Lepore]

Author: ian
Date: Fri Feb 13 20:23:06 2015
New Revision: 278702
URL: https://svnweb.freebsd.org/changeset/base/278702

Log:
  MFC r277305:  Minor cleanups, comment changes.

Modified:
  stable/10/sys/arm/arm/locore-v6.S
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/arm/arm/locore-v6.S
==============================================================================
--- stable/10/sys/arm/arm/locore-v6.S	Fri Feb 13 20:21:13 2015	(r278701)
+++ stable/10/sys/arm/arm/locore-v6.S	Fri Feb 13 20:23:06 2015	(r278702)
@@ -367,9 +367,9 @@ VA_TO_PA_POINTER(Lpagetable, boot_pt1)
 
 
 .Lstart:
-	.word	_edata
-	.word	_ebss
-	.word	svcstk
+	.word	_edata			/* Note that these three items are */
+	.word	_ebss			/* loaded with a single ldmia and */
+	.word	svcstk			/* must remain in order together. */
 
 .Lmainreturned:
 	.asciz	"main()	returned"
@@ -425,20 +425,19 @@ ASENTRY_NP(mpentry)
 	
 	bl	init_mmu
 
-	adr	r1, .Lstart
-	ldmia	r1, {r1, r2, sp}	/* Set initial stack and */
-	mrc	p15, 0,	r0, c0,	c0, 5
-	and	r0, r0,	#15
+	adr	r1, .Lstart+8		/* Get initstack pointer from */
+	ldr	sp, [r1]		/* startup data. */
+	mrc	CP15_MPIDR(r0)		/* Get processor id number. */
+	and	r0, r0,	#0x0f
 	mov	r1, #INIT_ARM_STACK_SIZE
-	mul	r2, r1,	r0
-	add	sp, sp,	r2
-	str	r1, [sp]
+	mul	r2, r1,	r0		/* Point sp to initstack */
+	add	sp, sp,	r2		/* area for this processor. */
 
 	/* Switch to virtual addresses.	*/
 	ldr	pc, =1f
 1:
 	mov	fp, #0			/* trace back starts here */
-	bl	_C_LABEL(init_secondary)	/* Off we go */
+	bl	_C_LABEL(init_secondary)/* Off we go, cpu id in r0. */
 
 	adr	r0, .Lmpreturned
 	b	_C_LABEL(panic)