1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Bootwrapper for ePAPR compliant firmwares
4 *
5 * Copyright 2010 David Gibson <david@gibson.dropbear.id.au>, IBM Corporation.
6 *
7 * Based on earlier bootwrappers by:
8 * (c) Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp,\
9 * and
10 * Scott Wood <scottwood@freescale.com>
11 * Copyright (c) 2007 Freescale Semiconductor, Inc.
12 */
13
14 #include "ops.h"
15 #include "stdio.h"
16 #include "io.h"
17 #include <libfdt.h>
18
19 BSS_STACK(4096);
20
21 #define EPAPR_SMAGIC 0x65504150
22 #define EPAPR_EMAGIC 0x45504150
23
24 static unsigned epapr_magic;
25 static unsigned long ima_size;
26 static unsigned long fdt_addr;
27
28 static void platform_fixups(void)
29 {
30 if ((epapr_magic != EPAPR_EMAGIC)
31 && (epapr_magic != EPAPR_SMAGIC))
32 fatal("r6 contained 0x%08x instead of ePAPR magic number\n",
33 epapr_magic);
34
35 if (ima_size < (unsigned long)_end)
36 printf("WARNING: Image loaded outside IMA!"
37 " (_end=%p, ima_size=0x%lx)\n", _end, ima_size);
38 if (ima_size < fdt_addr)
39 printf("WARNING: Device tree address is outside IMA!"
40 "(fdt_addr=0x%lx, ima_size=0x%lx)\n", fdt_addr,
41 ima_size);
42 if (ima_size < fdt_addr + fdt_totalsize((void *)fdt_addr))
43 printf("WARNING: Device tree extends outside IMA!"
44 " (fdt_addr=0x%lx, size=0x%x, ima_size=0x%lx\n",
45 fdt_addr, fdt_totalsize((void *)fdt_addr), ima_size);
46 }
47
48 void epapr_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
49 unsigned long r6, unsigned long r7)
50 {
51 epapr_magic = r6;
52 ima_size = r7;
53 fdt_addr = r3;
54
55 /* FIXME: we should process reserve entries */
56
57 simple_alloc_init(_end, ima_size - (unsigned long)_end, 32, 64);
58
59 fdt_init((void *)fdt_addr);
60
61 serial_console_init();
62 platform_ops.fixups = platform_fixups;
63 }
64
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