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;
  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 {
  74         firmware_filename = machine->firmware;
  75         if (strcmp(firmware_filename, "none")) {
  76             firmware_filename = riscv_find_firmware(firmware_filename);
  77         }
  78     }
  79
  80     if (strcmp(firmware_filename, "none")) {
  81         /* If not "none" load the firmware */
  82         riscv_load_firmware(firmware_filename, firmware_load_addr);
  83         g_free(firmware_filename);
  84     }
  85 }
  86
  87 char *riscv_find_firmware(const char *firmware_filename)
  88 {
  89     char *filename;
  90
  91     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, firmware_filename);
  92     if (filename == NULL) {
  93         error_report("Unable to load the RISC-V firmware \"%s\"",
  94                      firmware_filename);
  95         exit(1);
  96     }
  97
  98     return filename;
  99 }
 100
 101 target_ulong riscv_load_firmware(const char *firmware_filename,
 102                                  hwaddr firmware_load_addr)
 103 {
 104     uint64_t firmware_entry, firmware_start, firmware_end;
 105
 106     if (load_elf(firmware_filename, NULL, NULL, NULL, &firmware_entry,
 107                  &firmware_start, &firmware_end, 0, EM_RISCV, 1, 0) > 0) {
 108         return firmware_entry;
 109     }
 110
 111     if (load_image_targphys_as(firmware_filename, firmware_load_addr,
 112                                ram_size, NULL) > 0) {
 113         return firmware_load_addr;
 114     }
 115
 116     error_report("could not load firmware '%s'", firmware_filename);
 117     exit(1);
 118 }
 119
 120 target_ulong riscv_load_kernel(const char *kernel_filename)
 121 {
 122     uint64_t kernel_entry, kernel_high;
 123
 124     if (load_elf(kernel_filename, NULL, NULL, NULL,
 125                  &kernel_entry, NULL, &kernel_high, 0, EM_RISCV, 1, 0) > 0) {
 126         return kernel_entry;
 127     }
 128
 129     if (load_uimage_as(kernel_filename, &kernel_entry, NULL, NULL,
 130                        NULL, NULL, NULL) > 0) {
 131         return kernel_entry;
 132     }
 133
 134     if (load_image_targphys_as(kernel_filename, KERNEL_BOOT_ADDRESS,
 135                                ram_size, NULL) > 0) {
 136         return KERNEL_BOOT_ADDRESS;
 137     }
 138
 139     error_report("could not load kernel '%s'", kernel_filename);
 140     exit(1);
 141 }
 142
 143 hwaddr riscv_load_initrd(const char *filename, uint64_t mem_size,
 144                          uint64_t kernel_entry, hwaddr *start)
 145 {
 146     int size;
 147
 148     /*
 149      * We want to put the initrd far enough into RAM that when the
 150      * kernel is uncompressed it will not clobber the initrd. However
 151      * on boards without much RAM we must ensure that we still leave
 152      * enough room for a decent sized initrd, and on boards with large
 153      * amounts of RAM we must avoid the initrd being so far up in RAM
 154      * that it is outside lowmem and inaccessible to the kernel.
 155      * So for boards with less  than 256MB of RAM we put the initrd
 156      * halfway into RAM, and for boards with 256MB of RAM or more we put
 157      * the initrd at 128MB.
 158      */
 159     *start = kernel_entry + MIN(mem_size / 2, 128 * MiB);
 160
 161     size = load_ramdisk(filename, *start, mem_size - *start);
 162     if (size == -1) {
 163         size = load_image_targphys(filename, *start, mem_size - *start);
 164         if (size == -1) {
 165             error_report("could not load ramdisk '%s'", filename);
 166             exit(1);
 167         }
 168     }
 169
 170     return *start + size;
 171 }