make sure stack resides in cache

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1279 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/arch/ppc/init/crt0.S.lb

@@ -33,40 +33,48 @@ system_reset:
 #if USE_DCACHE_RAM == 1
 #define DCACHE_RAM_END	(DCACHE_RAM_BASE + DCACHE_RAM_SIZE - 1)
 	/*
-	 * Setup stack in cache
+	 * Set up stack in cache. The SP must be 16-byte (4-word) aligned
+	 * for SYSV EABI or 8-byte (2-word) aligned for PPC EABI, so we make 
+	 * it 16-byte aligned to cover both cases. Also we have to ensure that
+	 * the first word is located within the cache.
 	 */
-	lis     r1, DCACHE_RAM_END@ha
-	addi    r1, r1, DCACHE_RAM_END@l
-	stwu    r0,-64(r1) 
-	stwu    r1,-24(r1) 
+	lis     r1, (DCACHE_RAM_BASE+DCACHE_RAM_SIZE)@h
+	ori     r1, r1, (DCACHE_RAM_BASE+DCACHE_RAM_SIZE)@l
+	lis	r0, 0
+	stwu	r0, -4(r1)
+	stwu	r0, -4(r1)
+	stwu	r0, -4(r1)
+	stwu	r0, -4(r1)
 
+#if 0
 	/*
 	 * Clear stack
 	 */
-	lis	r4, DCACHE_RAM_BASE@ha
-	addi	r4, r4, DCACHE_RAM_BASE@l
-	lis	r7, DCACHE_RAM_END@ha
-	addi	r7, r7, DCACHE_RAM_END@l
+	lis	r4, DCACHE_RAM_BASE@h
+	ori	r4, r4, DCACHE_RAM_BASE@l
+	lis	r7, DCACHE_RAM_END@h
+	ori	r7, r7, DCACHE_RAM_END@l
 	lis	r5, 0
 1:	stwx	r5, 0, r4
 	addi	r4, r4, 4
 	cmp	0, 0, r4, r7
 	ble	1b
 	sync
+#endif
 
 	/*
 	 * Set up the EABI pointers, before we enter any C code
 	 */
-	lis     r13, _SDA_BASE_@ha
-	addi    r13, r13, _SDA_BASE_@l
-	lis     r2, _SDA2_BASE_@ha
-	addi    r2, r2, _SDA2_BASE_@l
+	lis     r13, _SDA_BASE_@h
+	ori     r13, r13, _SDA_BASE_@l
+	lis     r2, _SDA2_BASE_@h
+	ori     r2, r2, _SDA2_BASE_@l
 
 	/*
 	 * load start address into SRR0 for rfi
 	 */
-	lis	r3, ppc_main@ha
-	addi	r3, r3, ppc_main@l
+	lis	r3, ppc_main@h
+	ori 	r3, r3, ppc_main@l
 	mtspr	SRR0, r3
 
 	/*
@@ -79,8 +87,8 @@ system_reset:
 	/*
 	 * If something returns after rfi then die
 	 */
-	lis	r3, dead@ha
-	addi	r3, r3, dead@l
+	lis	r3, dead@h
+	ori	r3, r3, dead@l
 	mtlr	r3
 
 	/*