1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) Paul Mackerras 1997.
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun #include <stdarg.h>
6*4882a593Smuzhiyun #include <stddef.h>
7*4882a593Smuzhiyun #include "types.h"
8*4882a593Smuzhiyun #include "elf.h"
9*4882a593Smuzhiyun #include "string.h"
10*4882a593Smuzhiyun #include "stdio.h"
11*4882a593Smuzhiyun #include "page.h"
12*4882a593Smuzhiyun #include "ops.h"
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include "of.h"
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun /* Value picked to match that used by yaboot */
17*4882a593Smuzhiyun #define PROG_START 0x01400000 /* only used on 64-bit systems */
18*4882a593Smuzhiyun #define RAM_END (512<<20) /* Fixme: use OF */
19*4882a593Smuzhiyun #define ONE_MB 0x100000
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun static unsigned long claim_base;
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun void epapr_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
26*4882a593Smuzhiyun unsigned long r6, unsigned long r7);
27*4882a593Smuzhiyun
of_try_claim(unsigned long size)28*4882a593Smuzhiyun static void *of_try_claim(unsigned long size)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun unsigned long addr = 0;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun if (claim_base == 0)
33*4882a593Smuzhiyun claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun for(; claim_base < RAM_END; claim_base += ONE_MB) {
36*4882a593Smuzhiyun #ifdef DEBUG
37*4882a593Smuzhiyun printf(" trying: 0x%08lx\n\r", claim_base);
38*4882a593Smuzhiyun #endif
39*4882a593Smuzhiyun addr = (unsigned long) of_claim(claim_base, size, 0);
40*4882a593Smuzhiyun if (addr != PROM_ERROR)
41*4882a593Smuzhiyun break;
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun if (addr == 0)
44*4882a593Smuzhiyun return NULL;
45*4882a593Smuzhiyun claim_base = PAGE_ALIGN(claim_base + size);
46*4882a593Smuzhiyun return (void *)addr;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
of_image_hdr(const void * hdr)49*4882a593Smuzhiyun static void of_image_hdr(const void *hdr)
50*4882a593Smuzhiyun {
51*4882a593Smuzhiyun const Elf64_Ehdr *elf64 = hdr;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun if (elf64->e_ident[EI_CLASS] == ELFCLASS64) {
54*4882a593Smuzhiyun /*
55*4882a593Smuzhiyun * Maintain a "magic" minimum address. This keeps some older
56*4882a593Smuzhiyun * firmware platforms running.
57*4882a593Smuzhiyun */
58*4882a593Smuzhiyun if (claim_base < PROG_START)
59*4882a593Smuzhiyun claim_base = PROG_START;
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
of_platform_init(unsigned long a1,unsigned long a2,void * promptr)63*4882a593Smuzhiyun static void of_platform_init(unsigned long a1, unsigned long a2, void *promptr)
64*4882a593Smuzhiyun {
65*4882a593Smuzhiyun platform_ops.image_hdr = of_image_hdr;
66*4882a593Smuzhiyun platform_ops.malloc = of_try_claim;
67*4882a593Smuzhiyun platform_ops.exit = of_exit;
68*4882a593Smuzhiyun platform_ops.vmlinux_alloc = of_vmlinux_alloc;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun dt_ops.finddevice = of_finddevice;
71*4882a593Smuzhiyun dt_ops.getprop = of_getprop;
72*4882a593Smuzhiyun dt_ops.setprop = of_setprop;
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun of_console_init();
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun of_init(promptr);
77*4882a593Smuzhiyun loader_info.promptr = promptr;
78*4882a593Smuzhiyun if (a1 && a2 && a2 != 0xdeadbeef) {
79*4882a593Smuzhiyun loader_info.initrd_addr = a1;
80*4882a593Smuzhiyun loader_info.initrd_size = a2;
81*4882a593Smuzhiyun }
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun
platform_init(unsigned long r3,unsigned long r4,unsigned long r5,unsigned long r6,unsigned long r7)84*4882a593Smuzhiyun void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
85*4882a593Smuzhiyun unsigned long r6, unsigned long r7)
86*4882a593Smuzhiyun {
87*4882a593Smuzhiyun /* Detect OF vs. ePAPR boot */
88*4882a593Smuzhiyun if (r5)
89*4882a593Smuzhiyun of_platform_init(r3, r4, (void *)r5);
90*4882a593Smuzhiyun else
91*4882a593Smuzhiyun epapr_platform_init(r3, r4, r5, r6, r7);
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun
94