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-common.h"
  34 #include "cpu.h"
  35 #include "qemu/option.h"
  36 #include "qemu/config-file.h"
  37 #include "qemu/error-report.h"
  38 #include "sysemu/device_tree.h"
  39 #include "sysemu/reset.h"
  40 #include "sysemu/sysemu.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
  88     if (dtb_filename) {
  89         fdt = load_device_tree(dtb_filename, &fdt_size);
  90     }
  91     if (!fdt) {
  92         return 0;
  93     }
  94
  95     if (kernel_cmdline) {
  96         r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
  97                                     kernel_cmdline);
  98         if (r < 0) {
  99             fprintf(stderr, "couldn't set /chosen/bootargs\n");
 100         }
 101     }
 102
 103     if (bi.initrd_start) {
 104         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start",
 105                               translate_kernel_address(NULL, bi.initrd_start));
 106
 107         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end",
 108                               translate_kernel_address(NULL, bi.initrd_end));
 109     }
 110
 111     cpu_physical_memory_write(bi.fdt, fdt, fdt_size);
 112     return fdt_size;
 113 }
 114
 115 void nios2_load_kernel(Nios2CPU *cpu, hwaddr ddr_base,
 116                             uint32_t ramsize,
 117                             const char *initrd_filename,
 118                             const char *dtb_filename,
 119                             void (*machine_cpu_reset)(Nios2CPU *))
 120 {
 121     QemuOpts *machine_opts;
 122     const char *kernel_filename;
 123     const char *kernel_cmdline;
 124     const char *dtb_arg;
 125     char *filename = NULL;
 126
 127     machine_opts = qemu_get_machine_opts();
 128     kernel_filename = qemu_opt_get(machine_opts, "kernel");
 129     kernel_cmdline = qemu_opt_get(machine_opts, "append");
 130     dtb_arg = qemu_opt_get(machine_opts, "dtb");
 131     /* default to pcbios dtb as passed by machine_init */
 132     if (!dtb_arg) {
 133         filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename);
 134     }
 135
 136     boot_info.machine_cpu_reset = machine_cpu_reset;
 137     qemu_register_reset(main_cpu_reset, cpu);
 138
 139     if (kernel_filename) {
 140         int kernel_size, fdt_size;
 141         uint64_t entry, low, high;
 142         int big_endian = 0;
 143
 144 #ifdef TARGET_WORDS_BIGENDIAN
 145         big_endian = 1;
 146 #endif
 147
 148         /* Boots a kernel elf binary. */
 149         kernel_size = load_elf(kernel_filename, NULL, NULL, NULL,
 150                                &entry, &low, &high,
 151                                big_endian, EM_ALTERA_NIOS2, 0, 0);
 152         if ((uint32_t)entry == 0xc0000000) {
 153             /*
 154              * The Nios II processor reference guide documents that the
 155              * kernel is placed at virtual memory address 0xc0000000,
 156              * and we've got something that points there.  Reload it
 157              * and adjust the entry to get the address in physical RAM.
 158              */
 159             kernel_size = load_elf(kernel_filename, NULL,
 160                                    translate_kernel_address, NULL,
 161                                    &entry, NULL, NULL,
 162                                    big_endian, EM_ALTERA_NIOS2, 0, 0);
 163             boot_info.bootstrap_pc = ddr_base + 0xc0000000 +
 164                 (entry & 0x07ffffff);
 165         } else {
 166             /* Use the entry point in the ELF image.  */
 167             boot_info.bootstrap_pc = (uint32_t)entry;
 168         }
 169
 170         /* If it wasn't an ELF image, try an u-boot image. */
 171         if (kernel_size < 0) {
 172             hwaddr uentry, loadaddr = LOAD_UIMAGE_LOADADDR_INVALID;
 173
 174             kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0,
 175                                       NULL, NULL);
 176             boot_info.bootstrap_pc = uentry;
 177             high = loadaddr + kernel_size;
 178         }
 179
 180         /* Not an ELF image nor an u-boot image, try a RAW image. */
 181         if (kernel_size < 0) {
 182             kernel_size = load_image_targphys(kernel_filename, ddr_base,
 183                                               ram_size);
 184             boot_info.bootstrap_pc = ddr_base;
 185             high = ddr_base + kernel_size;
 186         }
 187
 188         high = ROUND_UP(high, 1 * MiB);
 189
 190         /* If initrd is available, it goes after the kernel, aligned to 1M. */
 191         if (initrd_filename) {
 192             int initrd_size;
 193             uint32_t initrd_offset;
 194
 195             boot_info.initrd_start = high;
 196             initrd_offset = boot_info.initrd_start - ddr_base;
 197
 198             initrd_size = load_ramdisk(initrd_filename,
 199                                        boot_info.initrd_start,
 200                                        ram_size - initrd_offset);
 201             if (initrd_size < 0) {
 202                 initrd_size = load_image_targphys(initrd_filename,
 203                                                   boot_info.initrd_start,
 204                                                   ram_size - initrd_offset);
 205             }
 206             if (initrd_size < 0) {
 207                 error_report("could not load initrd '%s'",
 208                              initrd_filename);
 209                 exit(EXIT_FAILURE);
 210             }
 211             high += initrd_size;
 212         }
 213         high = ROUND_UP(high, 4);
 214         boot_info.initrd_end = high;
 215
 216         /* Device tree must be placed right after initrd (if available) */
 217         boot_info.fdt = high;
 218         fdt_size = nios2_load_dtb(boot_info, ram_size, kernel_cmdline,
 219                                   /* Preference a -dtb argument */
 220                                   dtb_arg ? dtb_arg : filename);
 221         high += fdt_size;
 222
 223         /* Kernel command is at the end, 4k aligned. */
 224         boot_info.cmdline = ROUND_UP(high, 4 * KiB);
 225         if (kernel_cmdline && strlen(kernel_cmdline)) {
 226             pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
 227         }
 228     }
 229     g_free(filename);
 230 }