]> Git Repo - linux.git/blob - arch/powerpc/boot/epapr.c
mm: abstract the vma_merge()/split_vma() pattern for mprotect() et al.
[linux.git] / arch / powerpc / boot / epapr.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Bootwrapper for ePAPR compliant firmwares
4  *
5  * Copyright 2010 David Gibson <[email protected]>, IBM Corporation.
6  *
7  * Based on earlier bootwrappers by:
8  * (c) Benjamin Herrenschmidt <[email protected]>, IBM Corp,\
9  *   and
10  * Scott Wood <[email protected]>
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 }
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