hw/microblaze/boot.c

   1 /*
   2  * Microblaze kernel loader
   3  *
   4  * Copyright (c) 2012 Peter Crosthwaite <peter.crosthwaite@petalogix.com>
   5  * Copyright (c) 2012 PetaLogix
   6  * Copyright (c) 2009 Edgar E. Iglesias.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  */
  26
  27 #include "qemu/osdep.h"
  28 #include "qemu/datadir.h"
  29 #include "cpu.h"
  30 #include "qemu/option.h"
  31 #include "qemu/config-file.h"
  32 #include "qemu/error-report.h"
  33 #include "qemu/guest-random.h"
  34 #include "sysemu/device_tree.h"
  35 #include "sysemu/reset.h"
  36 #include "hw/boards.h"
  37 #include "hw/loader.h"
  38 #include "elf.h"
  39 #include "qemu/cutils.h"
  40
  41 #include "boot.h"
  42
  43 static struct
  44 {
  45     void (*machine_cpu_reset)(MicroBlazeCPU *);
  46     uint32_t bootstrap_pc;
  47     uint32_t cmdline;
  48     uint32_t initrd_start;
  49     uint32_t initrd_end;
  50     uint32_t fdt;
  51 } boot_info;
  52
  53 static void main_cpu_reset(void *opaque)
  54 {
  55     MicroBlazeCPU *cpu = opaque;
  56     CPUState *cs = CPU(cpu);
  57     CPUMBState *env = &cpu->env;
  58
  59     cpu_reset(cs);
  60     env->regs[5] = boot_info.cmdline;
  61     env->regs[6] = boot_info.initrd_start;
  62     env->regs[7] = boot_info.fdt;
  63     cpu_set_pc(cs, boot_info.bootstrap_pc);
  64     if (boot_info.machine_cpu_reset) {
  65         boot_info.machine_cpu_reset(cpu);
  66     }
  67 }
  68
  69 static int microblaze_load_dtb(hwaddr addr,
  70                                uint32_t ramsize,
  71                                uint32_t initrd_start,
  72                                uint32_t initrd_end,
  73                                const char *kernel_cmdline,
  74                                const char *dtb_filename)
  75 {
  76     int fdt_size;
  77     void *fdt = NULL;
  78     int r;
  79     uint8_t rng_seed[32];
  80
  81     if (dtb_filename) {
  82         fdt = load_device_tree(dtb_filename, &fdt_size);
  83     }
  84     if (!fdt) {
  85         return 0;
  86     }
  87
  88     qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
  89     qemu_fdt_setprop(fdt, "/chosen", "rng-seed", rng_seed, sizeof(rng_seed));
  90
  91     if (kernel_cmdline) {
  92         r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
  93                                     kernel_cmdline);
  94         if (r < 0) {
  95             fprintf(stderr, "couldn't set /chosen/bootargs\n");
  96         }
  97     }
  98
  99     if (initrd_start) {
 100         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start",
 101                               initrd_start);
 102
 103         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end",
 104                               initrd_end);
 105     }
 106
 107     cpu_physical_memory_write(addr, fdt, fdt_size);
 108     g_free(fdt);
 109     return fdt_size;
 110 }
 111
 112 static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
 113 {
 114     return addr - 0x30000000LL;
 115 }
 116
 117 void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base,
 118                             uint32_t ramsize,
 119                             const char *initrd_filename,
 120                             const char *dtb_filename,
 121                             void (*machine_cpu_reset)(MicroBlazeCPU *))
 122 {
 123     const char *kernel_filename;
 124     const char *kernel_cmdline;
 125     const char *dtb_arg;
 126     char *filename = NULL;
 127
 128     kernel_filename = current_machine->kernel_filename;
 129     kernel_cmdline = current_machine->kernel_cmdline;
 130     dtb_arg = current_machine->dtb;
 131     /* default to pcbios dtb as passed by machine_init */
 132     if (!dtb_arg && dtb_filename) {
 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;
 141         uint64_t entry, high;
 142         uint32_t base32;
 143
 144         /* Boots a kernel elf binary.  */
 145         kernel_size = load_elf(kernel_filename, NULL, NULL, NULL,
 146                                &entry, NULL, &high, NULL,
 147                                TARGET_BIG_ENDIAN, EM_MICROBLAZE, 0, 0);
 148         base32 = entry;
 149         if (base32 == 0xc0000000) {
 150             kernel_size = load_elf(kernel_filename, NULL,
 151                                    translate_kernel_address, NULL,
 152                                    &entry, NULL, NULL, NULL,
 153                                    TARGET_BIG_ENDIAN, EM_MICROBLAZE, 0, 0);
 154         }
 155         /* Always boot into physical ram.  */
 156         boot_info.bootstrap_pc = (uint32_t)entry;
 157
 158         /* If it wasn't an ELF image, try an u-boot image.  */
 159         if (kernel_size < 0) {
 160             hwaddr uentry, loadaddr = LOAD_UIMAGE_LOADADDR_INVALID;
 161
 162             kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0,
 163                                       NULL, NULL);
 164             boot_info.bootstrap_pc = uentry;
 165             high = (loadaddr + kernel_size + 3) & ~3;
 166         }
 167
 168         /* Not an ELF image nor an u-boot image, try a RAW image.  */
 169         if (kernel_size < 0) {
 170             kernel_size = load_image_targphys(kernel_filename, ddr_base,
 171                                               ramsize);
 172             boot_info.bootstrap_pc = ddr_base;
 173             high = (ddr_base + kernel_size + 3) & ~3;
 174         }
 175
 176         if (initrd_filename) {
 177             int initrd_size;
 178             uint32_t initrd_offset;
 179
 180             high = ROUND_UP(high + kernel_size, 4);
 181             boot_info.initrd_start = high;
 182             initrd_offset = boot_info.initrd_start - ddr_base;
 183
 184             initrd_size = load_ramdisk(initrd_filename,
 185                                        boot_info.initrd_start,
 186                                        ramsize - initrd_offset);
 187             if (initrd_size < 0) {
 188                 initrd_size = load_image_targphys(initrd_filename,
 189                                                   boot_info.initrd_start,
 190                                                   ramsize - initrd_offset);
 191             }
 192             if (initrd_size < 0) {
 193                 error_report("could not load initrd '%s'",
 194                              initrd_filename);
 195                 exit(EXIT_FAILURE);
 196             }
 197             boot_info.initrd_end = boot_info.initrd_start + initrd_size;
 198             high = ROUND_UP(high + initrd_size, 4);
 199         }
 200
 201         boot_info.cmdline = high + 4096;
 202         if (kernel_cmdline && strlen(kernel_cmdline)) {
 203             pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
 204         }
 205         /* Provide a device-tree.  */
 206         boot_info.fdt = boot_info.cmdline + 4096;
 207         microblaze_load_dtb(boot_info.fdt, ramsize,
 208                             boot_info.initrd_start,
 209                             boot_info.initrd_end,
 210                             kernel_cmdline,
 211                             /* Preference a -dtb argument */
 212                             dtb_arg ? dtb_arg : filename);
 213     }
 214     g_free(filename);
 215 }