1 /*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * Copyright (c) 2007 Semihalf, Rafal Jaworowski <raj@semihalf.com> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/param.h> 29 30 #include <stand.h> 31 #include <stdint.h> 32 33 #include "api_public.h" 34 #include "glue.h" 35 #include "libuboot.h" 36 37 /* 38 * MD primitives supporting placement of module data 39 */ 40 41 #ifdef __arm__ 42 #define KERN_ALIGN (2 * 1024 * 1024) 43 #else 44 #define KERN_ALIGN PAGE_SIZE 45 #endif 46 47 /* 48 * Avoid low memory, u-boot puts things like args and dtb blobs there. 49 */ 50 #define KERN_MINADDR max(KERN_ALIGN, (1024 * 1024)) 51 52 extern void _start(void); /* ubldr entry point address. */ 53 54 uint64_t loadbase; 55 bool loadbase_set = false; 56 57 /* 58 * This is called for every object loaded (kernel, module, dtb file, etc). The 59 * expected return value is the next address at or after the given addr which is 60 * appropriate for loading the given object described by type and data. On each 61 * call the addr is the next address following the previously loaded object. 62 */ 63 static uint64_t 64 uboot_loadaddr(void) 65 { 66 struct sys_info *si; 67 uint64_t sblock, eblock, subldr, eubldr; 68 uint64_t biggest_block, this_block; 69 uint64_t biggest_size, this_size; 70 int i; 71 char *envstr; 72 73 /* 74 * If the loader_kernaddr environment variable is set, blindly 75 * honor it. It had better be right. We force interpretation 76 * of the value in base-16 regardless of any leading 0x prefix, 77 * because that's the U-Boot convention. 78 */ 79 envstr = ub_env_get("loader_kernaddr"); 80 if (envstr != NULL) 81 return (strtoul(envstr, NULL, 16)); 82 83 /* 84 * Find addr/size of largest DRAM block. Carve our own address 85 * range out of the block, because loading the kernel over the 86 * top ourself is a poor memory-conservation strategy. Avoid 87 * memory at beginning of the first block of physical ram, 88 * since u-boot likes to pass args and data there. Assume that 89 * u-boot has moved itself to the very top of ram and 90 * optimistically assume that we won't run into it up there. 91 */ 92 if ((si = ub_get_sys_info()) == NULL) 93 panic("could not retrieve system info"); 94 95 biggest_block = 0; 96 biggest_size = 0; 97 subldr = rounddown2((uintptr_t)_start, KERN_ALIGN); 98 eubldr = roundup2((uint64_t)uboot_heap_end, KERN_ALIGN); 99 for (i = 0; i < si->mr_no; i++) { 100 if (si->mr[i].flags != MR_ATTR_DRAM) 101 continue; 102 sblock = roundup2((uint64_t)si->mr[i].start, 103 KERN_ALIGN); 104 eblock = rounddown2((uint64_t)si->mr[i].start + 105 si->mr[i].size, KERN_ALIGN); 106 if (biggest_size == 0) 107 sblock += KERN_MINADDR; 108 if (subldr >= sblock && subldr < eblock) { 109 if (subldr - sblock > eblock - eubldr) { 110 this_block = sblock; 111 this_size = subldr - sblock; 112 } else { 113 this_block = eubldr; 114 this_size = eblock - eubldr; 115 } 116 } else if (subldr < sblock && eubldr < eblock) { 117 /* Loader is below or engulfs the sblock */ 118 this_block = (eubldr < sblock) ? sblock : eubldr; 119 this_size = eblock - this_block; 120 } else { 121 this_block = 0; 122 this_size = 0; 123 } 124 if (biggest_size < this_size) { 125 biggest_block = this_block; 126 biggest_size = this_size; 127 } 128 } 129 if (biggest_size == 0) 130 panic("Not enough DRAM to load kernel"); 131 #if 0 132 printf("Loading kernel into region 0x%08jx-0x%08jx (%ju MiB)\n", 133 (uintmax_t)biggest_block, 134 (uintmax_t)biggest_block + biggest_size - 1, 135 (uintmax_t)biggest_size / 1024 / 1024); 136 #endif 137 return (biggest_block); 138 } 139 140 ssize_t 141 uboot_copyin(const void *src, vm_offset_t dest, const size_t len) 142 { 143 if (!loadbase_set) { 144 loadbase = uboot_loadaddr(); 145 loadbase_set = true; 146 } 147 148 bcopy(src, (void *)(dest + loadbase), len); 149 return (len); 150 } 151 152 ssize_t 153 uboot_copyout(const vm_offset_t src, void *dest, const size_t len) 154 { 155 bcopy((void *)(src + loadbase), dest, len); 156 return (len); 157 } 158 159 ssize_t 160 uboot_readin(readin_handle_t fd, vm_offset_t dest, const size_t len) 161 { 162 return (VECTX_READ(fd, (void *)dest, len)); 163 } 164