hw/nios2/boot.c

   1 /*
   2  * Nios2 kernel loader
   3  *
   4  * Copyright (c) 2016 Marek Vasut <marek.vasut@gmail.com>
   5  *
   6  * Based on microblaze kernel loader
   7  *
   8  * Copyright (c) 2012 Peter Crosthwaite <peter.crosthwaite@petalogix.com>
   9  * Copyright (c) 2012 PetaLogix
  10  * Copyright (c) 2009 Edgar E. Iglesias.
  11  *
  12  * Permission is hereby granted, free of charge, to any person obtaining a copy
  13  * of this software and associated documentation files (the "Software"), to deal
  14  * in the Software without restriction, including without limitation the rights
  15  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  16  * copies of the Software, and to permit persons to whom the Software is
  17  * furnished to do so, subject to the following conditions:
  18  *
  19  * The above copyright notice and this permission notice shall be included in
  20  * all copies or substantial portions of the Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  25  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  26  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  27  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  28  * THE SOFTWARE.
  29  */
  30
  31 #include "qemu/osdep.h"
  32 #include "qemu/units.h"
  33 #include "qemu/datadir.h"
  34 #include "qemu/option.h"
  35 #include "qemu/config-file.h"
  36 #include "qemu/error-report.h"
  37 #include "qemu/guest-random.h"
  38 #include "sysemu/device_tree.h"
  39 #include "sysemu/reset.h"
  40 #include "hw/boards.h"
  41 #include "hw/loader.h"
  42 #include "elf.h"
  43
  44 #include "boot.h"
  45
  46 #define NIOS2_MAGIC    0x534f494e
  47
  48 static struct nios2_boot_info {
  49     void (*machine_cpu_reset)(Nios2CPU *);
  50     uint32_t bootstrap_pc;
  51     uint32_t cmdline;
  52     uint32_t initrd_start;
  53     uint32_t initrd_end;
  54     uint32_t fdt;
  55 } boot_info;
  56
  57 static void main_cpu_reset(void *opaque)
  58 {
  59     Nios2CPU *cpu = opaque;
  60     CPUState *cs = CPU(cpu);
  61     CPUNios2State *env = &cpu->env;
  62
  63     cpu_reset(CPU(cpu));
  64
  65     env->regs[R_ARG0] = NIOS2_MAGIC;
  66     env->regs[R_ARG1] = boot_info.initrd_start;
  67     env->regs[R_ARG2] = boot_info.fdt;
  68     env->regs[R_ARG3] = boot_info.cmdline;
  69
  70     cpu_set_pc(cs, boot_info.bootstrap_pc);
  71     if (boot_info.machine_cpu_reset) {
  72         boot_info.machine_cpu_reset(cpu);
  73     }
  74 }
  75
  76 static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
  77 {
  78     return addr - 0xc0000000LL;
  79 }
  80
  81 static int nios2_load_dtb(struct nios2_boot_info bi, const uint32_t ramsize,
  82                           const char *kernel_cmdline, const char *dtb_filename)
  83 {
  84     int fdt_size;
  85     void *fdt = NULL;
  86     int r;
  87     uint8_t rng_seed[32];
  88
  89     if (dtb_filename) {
  90         fdt = load_device_tree(dtb_filename, &fdt_size);
  91     }
  92     if (!fdt) {
  93         return 0;
  94     }
  95
  96     qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
  97     qemu_fdt_setprop(fdt, "/chosen", "rng-seed", rng_seed, sizeof(rng_seed));
  98
  99     if (kernel_cmdline) {
 100         r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
 101                                     kernel_cmdline);
 102         if (r < 0) {
 103             fprintf(stderr, "couldn't set /chosen/bootargs\n");
 104         }
 105     }
 106
 107     if (bi.initrd_start) {
 108         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start",
 109                               translate_kernel_address(NULL, bi.initrd_start));
 110
 111         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end",
 112                               translate_kernel_address(NULL, bi.initrd_end));
 113     }
 114
 115     cpu_physical_memory_write(bi.fdt, fdt, fdt_size);
 116     g_free(fdt);
 117     return fdt_size;
 118 }
 119
 120 void nios2_load_kernel(Nios2CPU *cpu, hwaddr ddr_base,
 121                             uint32_t ramsize,
 122                             const char *initrd_filename,
 123                             const char *dtb_filename,
 124                             void (*machine_cpu_reset)(Nios2CPU *))
 125 {
 126     const char *kernel_filename;
 127     const char *kernel_cmdline;
 128     const char *dtb_arg;
 129     char *filename = NULL;
 130
 131     kernel_filename = current_machine->kernel_filename;
 132     kernel_cmdline = current_machine->kernel_cmdline;
 133     dtb_arg = current_machine->dtb;
 134     /* default to pcbios dtb as passed by machine_init */
 135     if (!dtb_arg) {
 136         filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename);
 137     }
 138
 139     boot_info.machine_cpu_reset = machine_cpu_reset;
 140     qemu_register_reset(main_cpu_reset, cpu);
 141
 142     if (kernel_filename) {
 143         int kernel_size, fdt_size;
 144         uint64_t entry, high;
 145         int big_endian = 0;
 146
 147 #if TARGET_BIG_ENDIAN
 148         big_endian = 1;
 149 #endif
 150
 151         /* Boots a kernel elf binary. */
 152         kernel_size = load_elf(kernel_filename, NULL, NULL, NULL,
 153                                &entry, NULL, &high, NULL,
 154                                big_endian, EM_ALTERA_NIOS2, 0, 0);
 155         if ((uint32_t)entry == 0xc0000000) {
 156             /*
 157              * The Nios II processor reference guide documents that the
 158              * kernel is placed at virtual memory address 0xc0000000,
 159              * and we've got something that points there.  Reload it
 160              * and adjust the entry to get the address in physical RAM.
 161              */
 162             kernel_size = load_elf(kernel_filename, NULL,
 163                                    translate_kernel_address, NULL,
 164                                    &entry, NULL, NULL, NULL,
 165                                    big_endian, EM_ALTERA_NIOS2, 0, 0);
 166             boot_info.bootstrap_pc = ddr_base + 0xc0000000 +
 167                 (entry & 0x07ffffff);
 168         } else {
 169             /* Use the entry point in the ELF image.  */
 170             boot_info.bootstrap_pc = (uint32_t)entry;
 171         }
 172
 173         /* If it wasn't an ELF image, try an u-boot image. */
 174         if (kernel_size < 0) {
 175             hwaddr uentry, loadaddr = LOAD_UIMAGE_LOADADDR_INVALID;
 176
 177             kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0,
 178                                       NULL, NULL);
 179             boot_info.bootstrap_pc = uentry;
 180             high = loadaddr + kernel_size;
 181         }
 182
 183         /* Not an ELF image nor an u-boot image, try a RAW image. */
 184         if (kernel_size < 0) {
 185             kernel_size = load_image_targphys(kernel_filename, ddr_base,
 186                                               ramsize);
 187             boot_info.bootstrap_pc = ddr_base;
 188             high = ddr_base + kernel_size;
 189         }
 190
 191         high = ROUND_UP(high, 1 * MiB);
 192
 193         /* If initrd is available, it goes after the kernel, aligned to 1M. */
 194         if (initrd_filename) {
 195             int initrd_size;
 196             uint32_t initrd_offset;
 197
 198             boot_info.initrd_start = high;
 199             initrd_offset = boot_info.initrd_start - ddr_base;
 200
 201             initrd_size = load_ramdisk(initrd_filename,
 202                                        boot_info.initrd_start,
 203                                        ramsize - initrd_offset);
 204             if (initrd_size < 0) {
 205                 initrd_size = load_image_targphys(initrd_filename,
 206                                                   boot_info.initrd_start,
 207                                                   ramsize - initrd_offset);
 208             }
 209             if (initrd_size < 0) {
 210                 error_report("could not load initrd '%s'",
 211                              initrd_filename);
 212                 exit(EXIT_FAILURE);
 213             }
 214             high += initrd_size;
 215         }
 216         high = ROUND_UP(high, 4);
 217         boot_info.initrd_end = high;
 218
 219         /* Device tree must be placed right after initrd (if available) */
 220         boot_info.fdt = high;
 221         fdt_size = nios2_load_dtb(boot_info, ramsize, kernel_cmdline,
 222                                   /* Preference a -dtb argument */
 223                                   dtb_arg ? dtb_arg : filename);
 224         high += fdt_size;
 225
 226         /* Kernel command is at the end, 4k aligned. */
 227         boot_info.cmdline = ROUND_UP(high, 4 * KiB);
 228         if (kernel_cmdline && strlen(kernel_cmdline)) {
 229             pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
 230         }
 231     }
 232     g_free(filename);
 233 }