1 /*- 2 * Copyright (C) 2018 Breno Leitao 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 17 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 18 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 19 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 20 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 21 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 22 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25 #include <sys/cdefs.h> 26 __FBSDID("$FreeBSD$"); 27 28 #include <sys/param.h> 29 #include <sys/kernel.h> 30 #include <sys/systm.h> 31 #include <sys/module.h> 32 #include <sys/types.h> 33 #include <sys/proc.h> 34 35 #include <vm/vm.h> 36 #include <vm/pmap.h> 37 38 #include <machine/bus.h> 39 #include <machine/elf.h> 40 #include <machine/param.h> 41 42 #include <dev/ofw/openfirm.h> 43 #include <dev/ofw/ofw_bus.h> 44 #include <dev/ofw/ofw_bus_subr.h> 45 46 #include "opt_md.h" 47 48 extern u_char *mfs_root; 49 extern int mfs_root_size; 50 51 static void ofw_initrd_probe_and_attach(void *junk); 52 53 SYSINIT(ofw_initrd_probe_and_attach, SI_SUB_KMEM, SI_ORDER_ANY, 54 ofw_initrd_probe_and_attach, NULL); 55 56 static void 57 ofw_initrd_probe_and_attach(void *junk) 58 { 59 phandle_t chosen; 60 vm_paddr_t start, end; 61 pcell_t cell[2]; 62 ssize_t size; 63 u_char *taste; 64 Elf_Ehdr ehdr; 65 66 if (!hw_direct_map) 67 return; 68 69 chosen = OF_finddevice("/chosen"); 70 if (chosen <= 0) 71 return; 72 73 if (!OF_hasprop(chosen, "linux,initrd-start") || 74 !OF_hasprop(chosen, "linux,initrd-end")) 75 return; 76 77 size = OF_getencprop(chosen, "linux,initrd-start", cell, sizeof(cell)); 78 if (size == 4) 79 start = cell[0]; 80 else if (size == 8) 81 start = (uint64_t)cell[0] << 32 | cell[1]; 82 else { 83 printf("ofw_initrd: Wrong linux,initrd-start size\n"); 84 return; 85 } 86 87 size = OF_getencprop(chosen, "linux,initrd-end", cell, sizeof(cell)); 88 if (size == 4) 89 end = cell[0]; 90 else if (size == 8) 91 end = (uint64_t)cell[0] << 32 | cell[1]; 92 else{ 93 printf("ofw_initrd: Wrong linux,initrd-end size\n"); 94 return; 95 } 96 97 if (end - start > 0) { 98 taste = (u_char*) PHYS_TO_DMAP(start); 99 memcpy(&ehdr, taste, sizeof(ehdr)); 100 101 if (IS_ELF(ehdr)) { 102 printf("ofw_initrd: initrd is kernel image!\n"); 103 return; 104 } 105 106 mfs_root = taste; 107 mfs_root_size = end - start; 108 printf("ofw_initrd: initrd loaded at 0x%08lx-0x%08lx\n", 109 start, end); 110 } 111 } 112