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/boards.h"
  26 #include "hw/loader.h"
  27 #include "hw/riscv/boot.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 = NULL;
  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 = riscv_find_firmware(default_machine_firmware);
  73     } else if (strcmp(machine->firmware, "none")) {
  74         firmware_filename = riscv_find_firmware(machine->firmware);
  75     }
  76
  77     if (firmware_filename) {
  78         /* If not "none" load the firmware */
  79         riscv_load_firmware(firmware_filename, firmware_load_addr);
  80         g_free(firmware_filename);
  81     }
  82 }
  83
  84 char *riscv_find_firmware(const char *firmware_filename)
  85 {
  86     char *filename;
  87
  88     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, firmware_filename);
  89     if (filename == NULL) {
  90         error_report("Unable to load the RISC-V firmware \"%s\"",
  91                      firmware_filename);
  92         exit(1);
  93     }
  94
  95     return filename;
  96 }
  97
  98 target_ulong riscv_load_firmware(const char *firmware_filename,
  99                                  hwaddr firmware_load_addr)
 100 {
 101     uint64_t firmware_entry, firmware_start, firmware_end;
 102
 103     if (load_elf(firmware_filename, NULL, NULL, NULL, &firmware_entry,
 104                  &firmware_start, &firmware_end, 0, EM_RISCV, 1, 0) > 0) {
 105         return firmware_entry;
 106     }
 107
 108     if (load_image_targphys_as(firmware_filename, firmware_load_addr,
 109                                ram_size, NULL) > 0) {
 110         return firmware_load_addr;
 111     }
 112
 113     error_report("could not load firmware '%s'", firmware_filename);
 114     exit(1);
 115 }
 116
 117 target_ulong riscv_load_kernel(const char *kernel_filename)
 118 {
 119     uint64_t kernel_entry, kernel_high;
 120
 121     if (load_elf(kernel_filename, NULL, NULL, NULL,
 122                  &kernel_entry, NULL, &kernel_high, 0, EM_RISCV, 1, 0) > 0) {
 123         return kernel_entry;
 124     }
 125
 126     if (load_uimage_as(kernel_filename, &kernel_entry, NULL, NULL,
 127                        NULL, NULL, NULL) > 0) {
 128         return kernel_entry;
 129     }
 130
 131     if (load_image_targphys_as(kernel_filename, KERNEL_BOOT_ADDRESS,
 132                                ram_size, NULL) > 0) {
 133         return KERNEL_BOOT_ADDRESS;
 134     }
 135
 136     error_report("could not load kernel '%s'", kernel_filename);
 137     exit(1);
 138 }
 139
 140 hwaddr riscv_load_initrd(const char *filename, uint64_t mem_size,
 141                          uint64_t kernel_entry, hwaddr *start)
 142 {
 143     int size;
 144
 145     /*
 146      * We want to put the initrd far enough into RAM that when the
 147      * kernel is uncompressed it will not clobber the initrd. However
 148      * on boards without much RAM we must ensure that we still leave
 149      * enough room for a decent sized initrd, and on boards with large
 150      * amounts of RAM we must avoid the initrd being so far up in RAM
 151      * that it is outside lowmem and inaccessible to the kernel.
 152      * So for boards with less  than 256MB of RAM we put the initrd
 153      * halfway into RAM, and for boards with 256MB of RAM or more we put
 154      * the initrd at 128MB.
 155      */
 156     *start = kernel_entry + MIN(mem_size / 2, 128 * MiB);
 157
 158     size = load_ramdisk(filename, *start, mem_size - *start);
 159     if (size == -1) {
 160         size = load_image_targphys(filename, *start, mem_size - *start);
 161         if (size == -1) {
 162             error_report("could not load ramdisk '%s'", filename);
 163             exit(1);
 164         }
 165     }
 166
 167     return *start + size;
 168 }