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