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 #include <sys/param.h> 27 #include <sys/kernel.h> 28 #include <sys/systm.h> 29 #include <sys/module.h> 30 #include <sys/types.h> 31 #include <sys/proc.h> 32 33 #include <vm/vm.h> 34 #include <vm/pmap.h> 35 36 #include <machine/bus.h> 37 #include <machine/elf.h> 38 #include <machine/param.h> 39 40 #include <dev/ofw/openfirm.h> 41 #include <dev/ofw/ofw_bus.h> 42 #include <dev/ofw/ofw_bus_subr.h> 43 44 #include "opt_md.h" 45 46 extern u_char *mfs_root; 47 extern int mfs_root_size; 48 49 static void ofw_initrd_probe_and_attach(void *junk); 50 51 SYSINIT(ofw_initrd_probe_and_attach, SI_SUB_KMEM, SI_ORDER_ANY, 52 ofw_initrd_probe_and_attach, NULL); 53 54 static void 55 ofw_initrd_probe_and_attach(void *junk) 56 { 57 phandle_t chosen; 58 vm_paddr_t start, end; 59 pcell_t cell[2]; 60 ssize_t size; 61 u_char *taste; 62 Elf_Ehdr ehdr; 63 64 if (!hw_direct_map) 65 return; 66 67 chosen = OF_finddevice("/chosen"); 68 if (chosen <= 0) 69 return; 70 71 if (!OF_hasprop(chosen, "linux,initrd-start") || 72 !OF_hasprop(chosen, "linux,initrd-end")) 73 return; 74 75 size = OF_getencprop(chosen, "linux,initrd-start", cell, sizeof(cell)); 76 if (size == 4) 77 start = cell[0]; 78 else if (size == 8) 79 start = (uint64_t)cell[0] << 32 | cell[1]; 80 else { 81 printf("ofw_initrd: Wrong linux,initrd-start size\n"); 82 return; 83 } 84 85 size = OF_getencprop(chosen, "linux,initrd-end", cell, sizeof(cell)); 86 if (size == 4) 87 end = cell[0]; 88 else if (size == 8) 89 end = (uint64_t)cell[0] << 32 | cell[1]; 90 else{ 91 printf("ofw_initrd: Wrong linux,initrd-end size\n"); 92 return; 93 } 94 95 if (end - start > 0) { 96 taste = (u_char*) PHYS_TO_DMAP(start); 97 memcpy(&ehdr, taste, sizeof(ehdr)); 98 99 if (IS_ELF(ehdr)) { 100 printf("ofw_initrd: initrd is kernel image!\n"); 101 return; 102 } 103 104 mfs_root = taste; 105 mfs_root_size = end - start; 106 printf("ofw_initrd: initrd loaded at 0x%08lx-0x%08lx\n", 107 start, end); 108 } 109 } 110