Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / powerpc / boot / epapr.c

diff --git a/kernel/arch/powerpc/boot/epapr.c b/kernel/arch/powerpc/boot/epapr.c
new file mode 100644 (file)
index 0000000..02e91aa
--- /dev/null
+++ b/kernel/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 epapr_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;
+}