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-common.h"
  29 #include "cpu.h"
  30 #include "qemu/option.h"
  31 #include "qemu/config-file.h"
  32 #include "qemu/error-report.h"
  33 #include "sysemu/device_tree.h"
  34 #include "sysemu/sysemu.h"
  35 #include "hw/loader.h"
  36 #include "elf.h"
  37 #include "qemu/cutils.h"
  38
  39 #include "boot.h"
  40
  41 static struct
  42 {
  43     void (*machine_cpu_reset)(MicroBlazeCPU *);
  44     uint32_t bootstrap_pc;
  45     uint32_t cmdline;
  46     uint32_t initrd_start;
  47     uint32_t initrd_end;
  48     uint32_t fdt;
  49 } boot_info;
  50
  51 static void main_cpu_reset(void *opaque)
  52 {
  53     MicroBlazeCPU *cpu = opaque;
  54     CPUState *cs = CPU(cpu);
  55     CPUMBState *env = &cpu->env;
  56
  57     cpu_reset(cs);
  58     env->regs[5] = boot_info.cmdline;
  59     env->regs[6] = boot_info.initrd_start;
  60     env->regs[7] = boot_info.fdt;
  61     cpu_set_pc(cs, boot_info.bootstrap_pc);
  62     if (boot_info.machine_cpu_reset) {
  63         boot_info.machine_cpu_reset(cpu);
  64     }
  65 }
  66
  67 static int microblaze_load_dtb(hwaddr addr,
  68                                uint32_t ramsize,
  69                                uint32_t initrd_start,
  70                                uint32_t initrd_end,
  71                                const char *kernel_cmdline,
  72                                const char *dtb_filename)
  73 {
  74     int fdt_size;
  75     void *fdt = NULL;
  76     int r;
  77
  78     if (dtb_filename) {
  79         fdt = load_device_tree(dtb_filename, &fdt_size);
  80     }
  81     if (!fdt) {
  82         return 0;
  83     }
  84
  85     if (kernel_cmdline) {
  86         r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
  87                                     kernel_cmdline);
  88         if (r < 0) {
  89             fprintf(stderr, "couldn't set /chosen/bootargs\n");
  90         }
  91     }
  92
  93     if (initrd_start) {
  94         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start",
  95                               initrd_start);
  96
  97         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end",
  98                               initrd_end);
  99     }
 100
 101     cpu_physical_memory_write(addr, fdt, fdt_size);
 102     return fdt_size;
 103 }
 104
 105 static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
 106 {
 107     return addr - 0x30000000LL;
 108 }
 109
 110 void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base,
 111                             uint32_t ramsize,
 112                             const char *initrd_filename,
 113                             const char *dtb_filename,
 114                             void (*machine_cpu_reset)(MicroBlazeCPU *))
 115 {
 116     QemuOpts *machine_opts;
 117     const char *kernel_filename;
 118     const char *kernel_cmdline;
 119     const char *dtb_arg;
 120     char *filename = NULL;
 121
 122     machine_opts = qemu_get_machine_opts();
 123     kernel_filename = qemu_opt_get(machine_opts, "kernel");
 124     kernel_cmdline = qemu_opt_get(machine_opts, "append");
 125     dtb_arg = qemu_opt_get(machine_opts, "dtb");
 126     /* default to pcbios dtb as passed by machine_init */
 127     if (!dtb_arg && dtb_filename) {
 128         filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename);
 129     }
 130
 131     boot_info.machine_cpu_reset = machine_cpu_reset;
 132     qemu_register_reset(main_cpu_reset, cpu);
 133
 134     if (kernel_filename) {
 135         int kernel_size;
 136         uint64_t entry, low, high;
 137         uint32_t base32;
 138         int big_endian = 0;
 139
 140 #ifdef TARGET_WORDS_BIGENDIAN
 141         big_endian = 1;
 142 #endif
 143
 144         /* Boots a kernel elf binary.  */
 145         kernel_size = load_elf(kernel_filename, NULL, NULL,
 146                                &entry, &low, &high,
 147                                big_endian, EM_MICROBLAZE, 0, 0);
 148         base32 = entry;
 149         if (base32 == 0xc0000000) {
 150             kernel_size = load_elf(kernel_filename, translate_kernel_address,
 151                                    NULL, &entry, NULL, NULL,
 152                                    big_endian, EM_MICROBLAZE, 0, 0);
 153         }
 154         /* Always boot into physical ram.  */
 155         boot_info.bootstrap_pc = (uint32_t)entry;
 156
 157         /* If it wasn't an ELF image, try an u-boot image.  */
 158         if (kernel_size < 0) {
 159             hwaddr uentry, loadaddr;
 160
 161             kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0,
 162                                       NULL, NULL);
 163             boot_info.bootstrap_pc = uentry;
 164             high = (loadaddr + kernel_size + 3) & ~3;
 165         }
 166
 167         /* Not an ELF image nor an u-boot image, try a RAW image.  */
 168         if (kernel_size < 0) {
 169             kernel_size = load_image_targphys(kernel_filename, ddr_base,
 170                                               ram_size);
 171             boot_info.bootstrap_pc = ddr_base;
 172             high = (ddr_base + kernel_size + 3) & ~3;
 173         }
 174
 175         if (initrd_filename) {
 176             int initrd_size;
 177             uint32_t initrd_offset;
 178
 179             high = ROUND_UP(high + kernel_size, 4);
 180             boot_info.initrd_start = high;
 181             initrd_offset = boot_info.initrd_start - ddr_base;
 182
 183             initrd_size = load_ramdisk(initrd_filename,
 184                                        boot_info.initrd_start,
 185                                        ram_size - initrd_offset);
 186             if (initrd_size < 0) {
 187                 initrd_size = load_image_targphys(initrd_filename,
 188                                                   boot_info.initrd_start,
 189                                                   ram_size - initrd_offset);
 190             }
 191             if (initrd_size < 0) {
 192                 error_report("could not load initrd '%s'",
 193                              initrd_filename);
 194                 exit(EXIT_FAILURE);
 195             }
 196             boot_info.initrd_end = boot_info.initrd_start + initrd_size;
 197             high = ROUND_UP(high + initrd_size, 4);
 198         }
 199
 200         boot_info.cmdline = high + 4096;
 201         if (kernel_cmdline && strlen(kernel_cmdline)) {
 202             pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
 203         }
 204         /* Provide a device-tree.  */
 205         boot_info.fdt = boot_info.cmdline + 4096;
 206         microblaze_load_dtb(boot_info.fdt, ram_size,
 207                             boot_info.initrd_start,
 208                             boot_info.initrd_end,
 209                             kernel_cmdline,
 210                             /* Preference a -dtb argument */
 211                             dtb_arg ? dtb_arg : filename);
 212     }
 213     g_free(filename);
 214 }