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 /* 55 * This is called for every object loaded (kernel, module, dtb file, etc). The 56 * expected return value is the next address at or after the given addr which is 57 * appropriate for loading the given object described by type and data. On each 58 * call the addr is the next address following the previously loaded object. 59 * 60 * The first call is for loading the kernel, and the addr argument will be zero, 61 * and we search for a big block of ram to load the kernel and modules. 62 * 63 * On subsequent calls the addr will be non-zero, and we just round it up so 64 * that each object begins on a page boundary. 65 */ 66 uint64_t 67 uboot_loadaddr(u_int type, void *data, uint64_t addr) 68 { 69 struct sys_info *si; 70 uint64_t sblock, eblock, subldr, eubldr; 71 uint64_t biggest_block, this_block; 72 uint64_t biggest_size, this_size; 73 int i; 74 char *envstr; 75 76 if (addr == 0) { 77 /* 78 * If the loader_kernaddr environment variable is set, blindly 79 * honor it. It had better be right. We force interpretation 80 * of the value in base-16 regardless of any leading 0x prefix, 81 * because that's the U-Boot convention. 82 */ 83 envstr = ub_env_get("loader_kernaddr"); 84 if (envstr != NULL) 85 return (strtoul(envstr, NULL, 16)); 86 87 /* 88 * Find addr/size of largest DRAM block. Carve our own address 89 * range out of the block, because loading the kernel over the 90 * top ourself is a poor memory-conservation strategy. Avoid 91 * memory at beginning of the first block of physical ram, 92 * since u-boot likes to pass args and data there. Assume that 93 * u-boot has moved itself to the very top of ram and 94 * optimistically assume that we won't run into it up there. 95 */ 96 if ((si = ub_get_sys_info()) == NULL) 97 panic("could not retrieve system info"); 98 99 biggest_block = 0; 100 biggest_size = 0; 101 subldr = rounddown2((uintptr_t)_start, KERN_ALIGN); 102 eubldr = roundup2((uint64_t)uboot_heap_end, KERN_ALIGN); 103 for (i = 0; i < si->mr_no; i++) { 104 if (si->mr[i].flags != MR_ATTR_DRAM) 105 continue; 106 sblock = roundup2((uint64_t)si->mr[i].start, 107 KERN_ALIGN); 108 eblock = rounddown2((uint64_t)si->mr[i].start + 109 si->mr[i].size, KERN_ALIGN); 110 if (biggest_size == 0) 111 sblock += KERN_MINADDR; 112 if (subldr >= sblock && subldr < eblock) { 113 if (subldr - sblock > eblock - eubldr) { 114 this_block = sblock; 115 this_size = subldr - sblock; 116 } else { 117 this_block = eubldr; 118 this_size = eblock - eubldr; 119 } 120 } else if (subldr < sblock && eubldr < eblock) { 121 /* Loader is below or engulfs the sblock */ 122 this_block = (eubldr < sblock) ? sblock : eubldr; 123 this_size = eblock - this_block; 124 } else { 125 this_block = 0; 126 this_size = 0; 127 } 128 if (biggest_size < this_size) { 129 biggest_block = this_block; 130 biggest_size = this_size; 131 } 132 } 133 if (biggest_size == 0) 134 panic("Not enough DRAM to load kernel"); 135 #if 0 136 printf("Loading kernel into region 0x%08jx-0x%08jx (%ju MiB)\n", 137 (uintmax_t)biggest_block, 138 (uintmax_t)biggest_block + biggest_size - 1, 139 (uintmax_t)biggest_size / 1024 / 1024); 140 #endif 141 return (biggest_block); 142 } 143 return roundup2(addr, PAGE_SIZE); 144 } 145 146 ssize_t 147 uboot_copyin(const void *src, vm_offset_t dest, const size_t len) 148 { 149 bcopy(src, (void *)dest, len); 150 return (len); 151 } 152 153 ssize_t 154 uboot_copyout(const vm_offset_t src, void *dest, const size_t len) 155 { 156 bcopy((void *)src, dest, len); 157 return (len); 158 } 159 160 ssize_t 161 uboot_readin(readin_handle_t fd, vm_offset_t dest, const size_t len) 162 { 163 return (VECTX_READ(fd, (void *)dest, len)); 164 } 165