1/** 2 * \file 3 * \brief Multiboot utility functions. 4 */ 5 6/* 7 * Copyright (c) 2007, 2008, 2009, 2010, ETH Zurich. 8 * All rights reserved. 9 * 10 * This file is distributed under the terms in the attached LICENSE file. 11 * If you do not find this file, copies can be found by writing to: 12 * ETH Zurich D-INFK, Haldeneggsteig 4, CH-8092 Zurich. Attn: Systems Group. 13 */ 14 15#include <kernel.h> 16#include <stdio.h> 17#include <string.h> 18#include <inttypes.h> 19#include <paging_kernel_arch.h> 20#include <elf/elf.h> 21#include <kernel_multiboot.h> 22#include <target/x86/barrelfish_kpi/coredata_target.h> 23 24struct x86_core_data *glbl_core_data = NULL; 25 26/** 27 * \brief Return multiboot module by trailing pathname. 28 * 29 * Returns a pointer to the multiboot module which has a trailing 30 * pathname of 'pathname' or NULL if there is none. 31 * 32 * \param pathname Trailing pathname of module to look for. 33 * 34 * \return Pointer to multiboot module or NULL if none found. 35 */ 36struct multiboot_modinfo *multiboot_find_module(const char *pathname) 37{ 38 struct multiboot_modinfo *mod = (struct multiboot_modinfo *) 39 local_phys_to_mem(glbl_core_data->mods_addr); 40 41 printf("%p %p\n", &glbl_core_data, glbl_core_data); 42 43 for(size_t i = 0; i < glbl_core_data->mods_count; i++) { 44 const char *modname = MBADDR_ASSTRING(mod[i].string), *endstr; 45 46 // Strip off trailing whitespace 47 if(strchr(modname, ' ')) { 48 endstr = strchr(modname, ' '); 49 } else { 50 endstr = modname + strlen(modname); 51 } 52 53 if(!strncmp(endstr - strlen(pathname), pathname, strlen(pathname))) { 54 return &mod[i]; 55 } 56 } 57 58 return NULL; 59} 60 61/** 62 * \brief Return end address of multiboot image 63 * 64 * This function is used to compute a safe location to place the boot kernel. 65 */ 66uintptr_t multiboot_end_addr(struct multiboot_info *mi) 67{ 68 lpaddr_t end = (lpaddr_t)mi + sizeof(struct multiboot_info); 69 70#define CHECK(pa) { lpaddr_t tmp = pa; if (tmp > end) { end = tmp; } } 71#define CHECK_STR(pstr) CHECK(pstr + strlen((char *)(uintptr_t)pstr) + 1) 72 73 if (mi->flags & MULTIBOOT_INFO_FLAG_HAS_CMDLINE) { 74 CHECK_STR(mi->cmdline) 75 } 76 77 if (mi->flags & MULTIBOOT_INFO_FLAG_HAS_MODS) { 78 struct multiboot_modinfo *mod = (void *)(uintptr_t)mi->mods_addr; 79 80 for(int i = 0; i < mi->mods_count; i++) { 81 CHECK(mod[i].mod_end) 82 CHECK_STR(mod[i].string) 83 } 84 } 85 86 if (mi->flags & MULTIBOOT_INFO_FLAG_HAS_ELF_SYMS) { 87 CHECK(mi->syms.elf.addr + mi->syms.elf.num * mi->syms.elf.size) 88 /* FIXME: does this include mi_elfshdr_shndx?? */ 89 } 90 91 if (mi->flags & MULTIBOOT_INFO_FLAG_HAS_MMAP) { 92 CHECK(mi->mmap_addr + mi->mmap_length) 93 } 94 95 if (mi->flags & MULTIBOOT_INFO_FLAG_HAS_DRIVES) { 96 CHECK(mi->drives_addr + mi->drives_length) 97 } 98 99 if (mi->flags & MULTIBOOT_INFO_FLAG_HAS_LOADERNAME) { 100 CHECK_STR(mi->boot_loader_name) 101 } 102 103 /* TODO: config table, APM table, VBE */ 104 105#undef CHECK 106#undef CHECK_STR 107 108 return end; 109} 110