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/device_tree.h"
  30 #include "sysemu/qtest.h"
  31
  32 #include <libfdt.h>
  33
  34 #if defined(TARGET_RISCV32)
  35 # define KERNEL_BOOT_ADDRESS 0x80400000
  36 #else
  37 # define KERNEL_BOOT_ADDRESS 0x80200000
  38 #endif
  39
  40 void riscv_find_and_load_firmware(MachineState *machine,
  41                                   const char *default_machine_firmware,
  42                                   hwaddr firmware_load_addr,
  43                                   symbol_fn_t sym_cb)
  44 {
  45     char *firmware_filename = NULL;
  46
  47     if ((!machine->firmware) || (!strcmp(machine->firmware, "default"))) {
  48         /*
  49          * The user didn't specify -bios, or has specified "-bios default".
  50          * That means we are going to load the OpenSBI binary included in
  51          * the QEMU source.
  52          */
  53         firmware_filename = riscv_find_firmware(default_machine_firmware);
  54     } else if (strcmp(machine->firmware, "none")) {
  55         firmware_filename = riscv_find_firmware(machine->firmware);
  56     }
  57
  58     if (firmware_filename) {
  59         /* If not "none" load the firmware */
  60         riscv_load_firmware(firmware_filename, firmware_load_addr, sym_cb);
  61         g_free(firmware_filename);
  62     }
  63 }
  64
  65 char *riscv_find_firmware(const char *firmware_filename)
  66 {
  67     char *filename;
  68
  69     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, firmware_filename);
  70     if (filename == NULL) {
  71         if (!qtest_enabled()) {
  72             /*
  73              * We only ship plain binary bios images in the QEMU source.
  74              * With Spike machine that uses ELF images as the default bios,
  75              * running QEMU test will complain hence let's suppress the error
  76              * report for QEMU testing.
  77              */
  78             error_report("Unable to load the RISC-V firmware \"%s\"",
  79                          firmware_filename);
  80             exit(1);
  81         }
  82     }
  83
  84     return filename;
  85 }
  86
  87 target_ulong riscv_load_firmware(const char *firmware_filename,
  88                                  hwaddr firmware_load_addr,
  89                                  symbol_fn_t sym_cb)
  90 {
  91     uint64_t firmware_entry, firmware_start, firmware_end;
  92
  93     if (load_elf_ram_sym(firmware_filename, NULL, NULL, NULL,
  94                          &firmware_entry, &firmware_start, &firmware_end, NULL,
  95                          0, EM_RISCV, 1, 0, NULL, true, sym_cb) > 0) {
  96         return firmware_entry;
  97     }
  98
  99     if (load_image_targphys_as(firmware_filename, firmware_load_addr,
 100                                ram_size, NULL) > 0) {
 101         return firmware_load_addr;
 102     }
 103
 104     error_report("could not load firmware '%s'", firmware_filename);
 105     exit(1);
 106 }
 107
 108 target_ulong riscv_load_kernel(const char *kernel_filename, symbol_fn_t sym_cb)
 109 {
 110     uint64_t kernel_entry, kernel_high;
 111
 112     if (load_elf_ram_sym(kernel_filename, NULL, NULL, NULL,
 113                          &kernel_entry, NULL, &kernel_high, NULL, 0,
 114                          EM_RISCV, 1, 0, NULL, true, sym_cb) > 0) {
 115         return kernel_entry;
 116     }
 117
 118     if (load_uimage_as(kernel_filename, &kernel_entry, NULL, NULL,
 119                        NULL, NULL, NULL) > 0) {
 120         return kernel_entry;
 121     }
 122
 123     if (load_image_targphys_as(kernel_filename, KERNEL_BOOT_ADDRESS,
 124                                ram_size, NULL) > 0) {
 125         return KERNEL_BOOT_ADDRESS;
 126     }
 127
 128     error_report("could not load kernel '%s'", kernel_filename);
 129     exit(1);
 130 }
 131
 132 hwaddr riscv_load_initrd(const char *filename, uint64_t mem_size,
 133                          uint64_t kernel_entry, hwaddr *start)
 134 {
 135     int size;
 136
 137     /*
 138      * We want to put the initrd far enough into RAM that when the
 139      * kernel is uncompressed it will not clobber the initrd. However
 140      * on boards without much RAM we must ensure that we still leave
 141      * enough room for a decent sized initrd, and on boards with large
 142      * amounts of RAM we must avoid the initrd being so far up in RAM
 143      * that it is outside lowmem and inaccessible to the kernel.
 144      * So for boards with less  than 256MB of RAM we put the initrd
 145      * halfway into RAM, and for boards with 256MB of RAM or more we put
 146      * the initrd at 128MB.
 147      */
 148     *start = kernel_entry + MIN(mem_size / 2, 128 * MiB);
 149
 150     size = load_ramdisk(filename, *start, mem_size - *start);
 151     if (size == -1) {
 152         size = load_image_targphys(filename, *start, mem_size - *start);
 153         if (size == -1) {
 154             error_report("could not load ramdisk '%s'", filename);
 155             exit(1);
 156         }
 157     }
 158
 159     return *start + size;
 160 }
 161
 162 void riscv_setup_rom_reset_vec(hwaddr start_addr, hwaddr rom_base,
 163                                hwaddr rom_size, void *fdt)
 164 {
 165     int i;
 166
 167     /* reset vector */
 168     uint32_t reset_vec[8] = {
 169         0x00000297,                  /* 1:  auipc  t0, %pcrel_hi(dtb) */
 170         0x02028593,                  /*     addi   a1, t0, %pcrel_lo(1b) */
 171         0xf1402573,                  /*     csrr   a0, mhartid  */
 172 #if defined(TARGET_RISCV32)
 173         0x0182a283,                  /*     lw     t0, 24(t0) */
 174 #elif defined(TARGET_RISCV64)
 175         0x0182b283,                  /*     ld     t0, 24(t0) */
 176 #endif
 177         0x00028067,                  /*     jr     t0 */
 178         0x00000000,
 179         start_addr,                  /* start: .dword */
 180         0x00000000,
 181                                      /* dtb: */
 182     };
 183
 184     /* copy in the reset vector in little_endian byte order */
 185     for (i = 0; i < sizeof(reset_vec) >> 2; i++) {
 186         reset_vec[i] = cpu_to_le32(reset_vec[i]);
 187     }
 188     rom_add_blob_fixed_as("mrom.reset", reset_vec, sizeof(reset_vec),
 189                           rom_base, &address_space_memory);
 190
 191     /* copy in the device tree */
 192     if (fdt_pack(fdt) || fdt_totalsize(fdt) >
 193         rom_size - sizeof(reset_vec)) {
 194         error_report("not enough space to store device-tree");
 195         exit(1);
 196     }
 197     qemu_fdt_dumpdtb(fdt, fdt_totalsize(fdt));
 198     rom_add_blob_fixed_as("mrom.fdt", fdt, fdt_totalsize(fdt),
 199                            rom_base + sizeof(reset_vec),
 200                            &address_space_memory);
 201
 202     return;
 203 }