xref: /openbmc/linux/arch/powerpc/boot/epapr.c (revision d2912cb1)
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 
platform_fixups(void)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 
epapr_platform_init(unsigned long r3,unsigned long r4,unsigned long r5,unsigned long r6,unsigned long r7)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