hw/riscv/boot.c

   1 /*
   2  * QEMU RISC-V Boot Helper
   3  *
   4  * Copyright (c) 2017 SiFive, Inc.
   5  * Copyright (c) 2019 Alistair Francis <alistair.francis@wdc.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms and conditions of the GNU General Public License,
   9  * version 2 or later, as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "qemu-common.h"
  22 #include "qemu/units.h"
  23 #include "qemu/error-report.h"
  24 #include "exec/cpu-defs.h"
  25 #include "hw/loader.h"
  26 #include "hw/riscv/boot.h"
  27 #include "hw/boards.h"
  28 #include "elf.h"
  29 #include "sysemu/qtest.h"
  30
  31 #if defined(TARGET_RISCV32)
  32 # define KERNEL_BOOT_ADDRESS 0x80400000
  33 #else
  34 # define KERNEL_BOOT_ADDRESS 0x80200000
  35 #endif
  36
  37 void riscv_find_and_load_firmware(MachineState *machine,
  38                                   const char *default_machine_firmware,
  39                                   hwaddr firmware_load_addr)
  40 {
  41     char *firmware_filename;
  42
  43     if (!machine->firmware) {
  44         /*
  45          * The user didn't specify -bios.
  46          * At the moment we default to loading nothing when this hapens.
  47          * In the future this defaul will change to loading the prebuilt
  48          * OpenSBI firmware. Let's warn the user and then continue.
  49         */
  50         if (!qtest_enabled()) {
  51             warn_report("No -bios option specified. Not loading a firmware.");
  52             warn_report("This default will change in a future QEMU release. " \
  53                         "Please use the -bios option to avoid breakages when "\
  54                         "this happens.");
  55             warn_report("See QEMU's deprecation documentation for details.");
  56         }
  57         return;
  58     }
  59
  60     if (!strcmp(machine->firmware, "default")) {
  61         /*
  62          * The user has specified "-bios default". That means we are going to
  63          * load the OpenSBI binary included in the QEMU source.
  64          *
  65          * We can't load the binary by default as it will break existing users
  66          * as users are already loading their own firmware.
  67          *
  68          * Let's try to get everyone to specify the -bios option at all times,
  69          * so then in the future we can make "-bios default" the default option
  70          * if no -bios option is set without breaking anything.
  71          */
  72         firmware_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS,
  73                                            default_machine_firmware);
  74         if (firmware_filename == NULL) {
  75             error_report("Unable to load the default RISC-V firmware \"%s\"",
  76                          default_machine_firmware);
  77             exit(1);
  78         }
  79     } else {
  80         firmware_filename = machine->firmware;
  81     }
  82
  83     if (strcmp(firmware_filename, "none")) {
  84         /* If not "none" load the firmware */
  85         riscv_load_firmware(firmware_filename, firmware_load_addr);
  86     }
  87
  88     if (!strcmp(machine->firmware, "default")) {
  89         g_free(firmware_filename);
  90     }
  91 }
  92
  93 target_ulong riscv_load_firmware(const char *firmware_filename,
  94                                  hwaddr firmware_load_addr)
  95 {
  96     uint64_t firmware_entry, firmware_start, firmware_end;
  97
  98     if (load_elf(firmware_filename, NULL, NULL, NULL, &firmware_entry,
  99                  &firmware_start, &firmware_end, 0, EM_RISCV, 1, 0) > 0) {
 100         return firmware_entry;
 101     }
 102
 103     if (load_image_targphys_as(firmware_filename, firmware_load_addr,
 104                                ram_size, NULL) > 0) {
 105         return firmware_load_addr;
 106     }
 107
 108     error_report("could not load firmware '%s'", firmware_filename);
 109     exit(1);
 110 }
 111
 112 target_ulong riscv_load_kernel(const char *kernel_filename)
 113 {
 114     uint64_t kernel_entry, kernel_high;
 115
 116     if (load_elf(kernel_filename, NULL, NULL, NULL,
 117                  &kernel_entry, NULL, &kernel_high, 0, EM_RISCV, 1, 0) > 0) {
 118         return kernel_entry;
 119     }
 120
 121     if (load_uimage_as(kernel_filename, &kernel_entry, NULL, NULL,
 122                        NULL, NULL, NULL) > 0) {
 123         return kernel_entry;
 124     }
 125
 126     if (load_image_targphys_as(kernel_filename, KERNEL_BOOT_ADDRESS,
 127                                ram_size, NULL) > 0) {
 128         return KERNEL_BOOT_ADDRESS;
 129     }
 130
 131     error_report("could not load kernel '%s'", kernel_filename);
 132     exit(1);
 133 }
 134
 135 hwaddr riscv_load_initrd(const char *filename, uint64_t mem_size,
 136                          uint64_t kernel_entry, hwaddr *start)
 137 {
 138     int size;
 139
 140     /*
 141      * We want to put the initrd far enough into RAM that when the
 142      * kernel is uncompressed it will not clobber the initrd. However
 143      * on boards without much RAM we must ensure that we still leave
 144      * enough room for a decent sized initrd, and on boards with large
 145      * amounts of RAM we must avoid the initrd being so far up in RAM
 146      * that it is outside lowmem and inaccessible to the kernel.
 147      * So for boards with less  than 256MB of RAM we put the initrd
 148      * halfway into RAM, and for boards with 256MB of RAM or more we put
 149      * the initrd at 128MB.
 150      */
 151     *start = kernel_entry + MIN(mem_size / 2, 128 * MiB);
 152
 153     size = load_ramdisk(filename, *start, mem_size - *start);
 154     if (size == -1) {
 155         size = load_image_targphys(filename, *start, mem_size - *start);
 156         if (size == -1) {
 157             error_report("could not load ramdisk '%s'", filename);
 158             exit(1);
 159         }
 160     }
 161
 162     return *start + size;
 163 }