[PATCH v3 5/6] powerpc/44x: boot wrapper: allow kernel to load into non-zero address

[Dave Kleikamp]

For AMP, different kernel instances load into separate memory regions.
Read the start of memory from the device tree and limit the memory to what's
specified in the device tree.

Signed-off-by: Dave Kleikamp <shaggy at linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Cc: Josh Boyer <jwboyer at linux.vnet.ibm.com>
Cc: linuxppc-dev at lists.ozlabs.org
---
 arch/powerpc/boot/treeboot-iss4xx.c |   22 +++++++++++++++++++++-
 1 files changed, 21 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/boot/treeboot-iss4xx.c b/arch/powerpc/boot/treeboot-iss4xx.c
index fcc4495..674e3bd 100644
--- a/arch/powerpc/boot/treeboot-iss4xx.c
+++ b/arch/powerpc/boot/treeboot-iss4xx.c
@@ -34,9 +34,28 @@
 
 BSS_STACK(4096);
 
+static u32 ibm4xx_memstart;
+
 static void iss_4xx_fixups(void)
 {
-	ibm4xx_sdram_fixup_memsize();
+	void *memory;
+	u32 reg[3];
+
+	memory = finddevice("/memory");
+	if (!memory)
+		fatal("Can't find memory node\n");
+	getprop(memory, "reg", reg, sizeof(reg));
+	if (reg[2])
+		/* If the device tree specifies the memory range, use it */
+		ibm4xx_memstart = reg[1];
+	else
+		/* othersize, read it from the SDRAM controller */
+		ibm4xx_sdram_fixup_memsize();
+}
+
+static void *iss_4xx_vmlinux_alloc(unsigned long size)
+{
+	return (void *)ibm4xx_memstart;
 }
 
 #define SPRN_PIR	0x11E	/* Processor Indentification Register */
@@ -48,6 +67,7 @@ void platform_init(void)
 
 	simple_alloc_init(_end, avail_ram, 128, 64);
 	platform_ops.fixups = iss_4xx_fixups;
+	platform_ops.vmlinux_alloc = iss_4xx_vmlinux_alloc;
 	platform_ops.exit = ibm44x_dbcr_reset;
 	pir_reg = mfspr(SPRN_PIR);
 	fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
-- 
1.7.3.4