| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Paul Mackerras 1997. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | */ |
| 9 | #include <stdarg.h> |
| 10 | #include <stddef.h> |
| 11 | #include "types.h" |
| 12 | #include "elf.h" |
| 13 | #include "string.h" |
| 14 | #include "stdio.h" |
| 15 | #include "page.h" |
| 16 | #include "ops.h" |
| 17 | |
| 18 | #include "of.h" |
| 19 | |
| 20 | /* Value picked to match that used by yaboot */ |
| 21 | #define PROG_START 0x01400000 /* only used on 64-bit systems */ |
| 22 | #define RAM_END (512<<20) /* Fixme: use OF */ |
| 23 | #define ONE_MB 0x100000 |
| 24 | |
| 25 | |
| 26 | |
| 27 | static unsigned long claim_base; |
| 28 | |
| 29 | void epapr_platform_init(unsigned long r3, unsigned long r4, unsigned long r5, |
| 30 | unsigned long r6, unsigned long r7); |
| 31 | |
| 32 | static void *of_try_claim(unsigned long size) |
| 33 | { |
| 34 | unsigned long addr = 0; |
| 35 | |
| 36 | if (claim_base == 0) |
| 37 | claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB); |
| 38 | |
| 39 | for(; claim_base < RAM_END; claim_base += ONE_MB) { |
| 40 | #ifdef DEBUG |
| 41 | printf(" trying: 0x%08lx\n\r", claim_base); |
| 42 | #endif |
| 43 | addr = (unsigned long) of_claim(claim_base, size, 0); |
| 44 | if (addr != PROM_ERROR) |
| 45 | break; |
| 46 | } |
| 47 | if (addr == 0) |
| 48 | return NULL; |
| 49 | claim_base = PAGE_ALIGN(claim_base + size); |
| 50 | return (void *)addr; |
| 51 | } |
| 52 | |
| 53 | static void of_image_hdr(const void *hdr) |
| 54 | { |
| 55 | const Elf64_Ehdr *elf64 = hdr; |
| 56 | |
| 57 | if (elf64->e_ident[EI_CLASS] == ELFCLASS64) { |
| 58 | /* |
| 59 | * Maintain a "magic" minimum address. This keeps some older |
| 60 | * firmware platforms running. |
| 61 | */ |
| 62 | if (claim_base < PROG_START) |
| 63 | claim_base = PROG_START; |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | static void of_platform_init(unsigned long a1, unsigned long a2, void *promptr) |
| 68 | { |
| 69 | platform_ops.image_hdr = of_image_hdr; |
| 70 | platform_ops.malloc = of_try_claim; |
| 71 | platform_ops.exit = of_exit; |
| 72 | platform_ops.vmlinux_alloc = of_vmlinux_alloc; |
| 73 | |
| 74 | dt_ops.finddevice = of_finddevice; |
| 75 | dt_ops.getprop = of_getprop; |
| 76 | dt_ops.setprop = of_setprop; |
| 77 | |
| 78 | of_console_init(); |
| 79 | |
| 80 | of_init(promptr); |
| 81 | loader_info.promptr = promptr; |
| 82 | if (a1 && a2 && a2 != 0xdeadbeef) { |
| 83 | loader_info.initrd_addr = a1; |
| 84 | loader_info.initrd_size = a2; |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | void platform_init(unsigned long r3, unsigned long r4, unsigned long r5, |
| 89 | unsigned long r6, unsigned long r7) |
| 90 | { |
| 91 | /* Detect OF vs. ePAPR boot */ |
| 92 | if (r5) |
| 93 | of_platform_init(r3, r4, (void *)r5); |
| 94 | else |
| 95 | epapr_platform_init(r3, r4, r5, r6, r7); |
| 96 | } |
| 97 | |