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authorDavid Gibson <dwg@au1.ibm.com>2011-04-14 18:29:16 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-04-20 16:59:21 +1000
commit6c5b59b913874cae535a324a671b7ed4f17e6397 (patch)
treeff96b53f4ee23150142a1105fbcbaf90e432d5ff
parent6975a783d7b40c79be4b7a7ea450e023ff7e5e02 (diff)
downloadlinaro-lsk-6c5b59b913874cae535a324a671b7ed4f17e6397.tar.gz
powerpc/boot: Add an ePAPR compliant boot wrapper
This is a first cut at making bootwrapper code which will produce a zImage compliant with the requirements set down by ePAPR. This is a very simple bootwrapper, taking the device tree blob supplied by the ePAPR boot program and passing it on to the kernel. It builds on the earlier patch to build a relocatable ET_DYN zImage to meet the other ePAPR image requirements. For good measure we have some paranoid checks which will generate warnings if some of the ePAPR entry condition guarantees are not met. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/Kconfig6
-rw-r--r--arch/powerpc/boot/Makefile4
-rw-r--r--arch/powerpc/boot/epapr.c66
-rwxr-xr-xarch/powerpc/boot/wrapper4
4 files changed, 79 insertions, 1 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 8f4d50b0adf..a3128ca0fe1 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -193,6 +193,12 @@ config SYS_SUPPORTS_APM_EMULATION
default y if PMAC_APM_EMU
bool
+config EPAPR_BOOT
+ bool
+ help
+ Used to allow a board to specify it wants an ePAPR compliant wrapper.
+ default n
+
config DEFAULT_UIMAGE
bool
help
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 89178164af5..0e2a152c3aa 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -69,7 +69,8 @@ src-wlib := string.S crt0.S crtsavres.S stdio.c main.c \
cpm-serial.c stdlib.c mpc52xx-psc.c planetcore.c uartlite.c \
fsl-soc.c mpc8xx.c pq2.c ugecon.c
src-plat := of.c cuboot-52xx.c cuboot-824x.c cuboot-83xx.c cuboot-85xx.c holly.c \
- cuboot-ebony.c cuboot-hotfoot.c treeboot-ebony.c prpmc2800.c \
+ cuboot-ebony.c cuboot-hotfoot.c epapr.c treeboot-ebony.c \
+ prpmc2800.c \
ps3-head.S ps3-hvcall.S ps3.c treeboot-bamboo.c cuboot-8xx.c \
cuboot-pq2.c cuboot-sequoia.c treeboot-walnut.c \
cuboot-bamboo.c cuboot-mpc7448hpc2.c cuboot-taishan.c \
@@ -182,6 +183,7 @@ image-$(CONFIG_PPC_HOLLY) += dtbImage.holly
image-$(CONFIG_PPC_PRPMC2800) += dtbImage.prpmc2800
image-$(CONFIG_PPC_ISERIES) += zImage.iseries
image-$(CONFIG_DEFAULT_UIMAGE) += uImage
+image-$(CONFIG_EPAPR_BOOT) += zImage.epapr
#
# Targets which embed a device tree blob
diff --git a/arch/powerpc/boot/epapr.c b/arch/powerpc/boot/epapr.c
new file mode 100644
index 00000000000..06c1961bd12
--- /dev/null
+++ b/arch/powerpc/boot/epapr.c
@@ -0,0 +1,66 @@
+/*
+ * Bootwrapper for ePAPR compliant firmwares
+ *
+ * Copyright 2010 David Gibson <david@gibson.dropbear.id.au>, IBM Corporation.
+ *
+ * Based on earlier bootwrappers by:
+ * (c) Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp,\
+ * and
+ * Scott Wood <scottwood@freescale.com>
+ * Copyright (c) 2007 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include "ops.h"
+#include "stdio.h"
+#include "io.h"
+#include <libfdt.h>
+
+BSS_STACK(4096);
+
+#define EPAPR_SMAGIC 0x65504150
+#define EPAPR_EMAGIC 0x45504150
+
+static unsigned epapr_magic;
+static unsigned long ima_size;
+static unsigned long fdt_addr;
+
+static void platform_fixups(void)
+{
+ if ((epapr_magic != EPAPR_EMAGIC)
+ && (epapr_magic != EPAPR_SMAGIC))
+ fatal("r6 contained 0x%08x instead of ePAPR magic number\n",
+ epapr_magic);
+
+ if (ima_size < (unsigned long)_end)
+ printf("WARNING: Image loaded outside IMA!"
+ " (_end=%p, ima_size=0x%lx)\n", _end, ima_size);
+ if (ima_size < fdt_addr)
+ printf("WARNING: Device tree address is outside IMA!"
+ "(fdt_addr=0x%lx, ima_size=0x%lx)\n", fdt_addr,
+ ima_size);
+ if (ima_size < fdt_addr + fdt_totalsize((void *)fdt_addr))
+ printf("WARNING: Device tree extends outside IMA!"
+ " (fdt_addr=0x%lx, size=0x%x, ima_size=0x%lx\n",
+ fdt_addr, fdt_totalsize((void *)fdt_addr), ima_size);
+}
+
+void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
+ unsigned long r6, unsigned long r7)
+{
+ epapr_magic = r6;
+ ima_size = r7;
+ fdt_addr = r3;
+
+ /* FIXME: we should process reserve entries */
+
+ simple_alloc_init(_end, ima_size - (unsigned long)_end, 32, 64);
+
+ fdt_init((void *)fdt_addr);
+
+ serial_console_init();
+ platform_ops.fixups = platform_fixups;
+}
diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper
index fef52786781..dfa29cb0f47 100755
--- a/arch/powerpc/boot/wrapper
+++ b/arch/powerpc/boot/wrapper
@@ -247,6 +247,10 @@ gamecube|wii)
treeboot-iss4xx-mpic)
platformo="$object/treeboot-iss4xx.o"
;;
+epapr)
+ link_address='0x20000000'
+ pie=-pie
+ ;;
esac
vmz="$tmpdir/`basename \"$kernel\"`.$ext"