From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Mon, 13 Oct 2008 18:38:48 +0000 (+0000)
Subject: powerpc: Fix 32-bit SMP boot on CHRP
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2bda347bc53fe2cacd5621d8a0426840a8d2a6a6;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

powerpc: Fix 32-bit SMP boot on CHRP

prom_init was changed to take a new argument, the address
where the kernel is loaded, which is now used to copy the
SMP spin loop down before use.

However, only head_64.S was adapted to pass this new value,
not head_32.S, thus breaking SMP boot on 32-bit SMP CHRP
machines.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index a6de6dbc5ed8..0c326823c6d4 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -110,6 +110,12 @@ __start:
 #ifdef CONFIG_PPC_MULTIPLATFORM
 	cmpwi	0,r5,0
 	beq	1f
+
+	/* find out where we are now */
+	bcl	20,31,$+4
+0:	mflr	r8			/* r8 = runtime addr here */
+	addis	r8,r8,(_stext - 0b)@ha
+	addi	r8,r8,(_stext - 0b)@l	/* current runtime base addr */
 	bl	prom_init
 	trap
 #endif