1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
4 *
5 * Based on earlier code:
6 * Copyright (C) Paul Mackerras 1997.
7 *
8 * Matt Porter <mporter@kernel.crashing.org>
9 * Copyright 2002-2005 MontaVista Software Inc.
10 *
11 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
12 * Copyright (c) 2003, 2004 Zultys Technologies
13 *
14 * Copyright 2007 David Gibson, IBM Corporation.
15 */
16#include <stdarg.h>
17#include <stddef.h>
18#include "types.h"
19#include "elf.h"
20#include "string.h"
21#include "stdio.h"
22#include "page.h"
23#include "ops.h"
24#include "reg.h"
25#include "io.h"
26#include "dcr.h"
27#include "4xx.h"
28#include "44x.h"
29#include "libfdt.h"
30
31BSS_STACK(4096);
32
33static u32 ibm4xx_memstart;
34
35static void iss_4xx_fixups(void)
36{
37 void *memory;
38 u32 reg[3];
39
40 memory = finddevice(name: "/memory");
41 if (!memory)
42 fatal("Can't find memory node\n");
43 /* This assumes #address-cells = 2, #size-cells =1 and that */
44 getprop(devp: memory, name: "reg", buf: reg, buflen: sizeof(reg));
45 if (reg[2])
46 /* If the device tree specifies the memory range, use it */
47 ibm4xx_memstart = reg[1];
48 else
49 /* othersize, read it from the SDRAM controller */
50 ibm4xx_sdram_fixup_memsize();
51}
52
53static void *iss_4xx_vmlinux_alloc(unsigned long size)
54{
55 return (void *)ibm4xx_memstart;
56}
57
58#define SPRN_PIR 0x11E /* Processor Identification Register */
59void platform_init(void)
60{
61 unsigned long end_of_ram = 0x08000000;
62 unsigned long avail_ram = end_of_ram - (unsigned long)_end;
63 u32 pir_reg;
64
65 simple_alloc_init(base: _end, heap_size: avail_ram, granularity: 128, max_allocs: 64);
66 platform_ops.fixups = iss_4xx_fixups;
67 platform_ops.vmlinux_alloc = iss_4xx_vmlinux_alloc;
68 platform_ops.exit = ibm44x_dbcr_reset;
69 pir_reg = mfspr(SPRN_PIR);
70 fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
71 fdt_init(blob: _dtb_start);
72 serial_console_init();
73}
74

source code of linux/arch/powerpc/boot/treeboot-iss4xx.c