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/reset.h"
  35 #include "sysemu/sysemu.h"
  36 #include "hw/loader.h"
  37 #include "elf.h"
  38 #include "qemu/cutils.h"
  39
  40 #include "boot.h"
  41
  42 static struct
  43 {
  44     void (*machine_cpu_reset)(MicroBlazeCPU *);
  45     uint32_t bootstrap_pc;
  46     uint32_t cmdline;
  47     uint32_t initrd_start;
  48     uint32_t initrd_end;
  49     uint32_t fdt;
  50 } boot_info;
  51
  52 static void main_cpu_reset(void *opaque)
  53 {
  54     MicroBlazeCPU *cpu = opaque;
  55     CPUState *cs = CPU(cpu);
  56     CPUMBState *env = &cpu->env;
  57
  58     cpu_reset(cs);
  59     env->regs[5] = boot_info.cmdline;
  60     env->regs[6] = boot_info.initrd_start;
  61     env->regs[7] = boot_info.fdt;
  62     cpu_set_pc(cs, boot_info.bootstrap_pc);
  63     if (boot_info.machine_cpu_reset) {
  64         boot_info.machine_cpu_reset(cpu);
  65     }
  66 }
  67
  68 static int microblaze_load_dtb(hwaddr addr,
  69                                uint32_t ramsize,
  70                                uint32_t initrd_start,
  71                                uint32_t initrd_end,
  72                                const char *kernel_cmdline,
  73                                const char *dtb_filename)
  74 {
  75     int fdt_size;
  76     void *fdt = NULL;
  77     int r;
  78
  79     if (dtb_filename) {
  80         fdt = load_device_tree(dtb_filename, &fdt_size);
  81     }
  82     if (!fdt) {
  83         return 0;
  84     }
  85
  86     if (kernel_cmdline) {
  87         r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
  88                                     kernel_cmdline);
  89         if (r < 0) {
  90             fprintf(stderr, "couldn't set /chosen/bootargs\n");
  91         }
  92     }
  93
  94     if (initrd_start) {
  95         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start",
  96                               initrd_start);
  97
  98         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end",
  99                               initrd_end);
 100     }
 101
 102     cpu_physical_memory_write(addr, fdt, fdt_size);
 103     g_free(fdt);
 104     return fdt_size;
 105 }
 106
 107 static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
 108 {
 109     return addr - 0x30000000LL;
 110 }
 111
 112 void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base,
 113                             uint32_t ramsize,
 114                             const char *initrd_filename,
 115                             const char *dtb_filename,
 116                             void (*machine_cpu_reset)(MicroBlazeCPU *))
 117 {
 118     QemuOpts *machine_opts;
 119     const char *kernel_filename;
 120     const char *kernel_cmdline;
 121     const char *dtb_arg;
 122     char *filename = NULL;
 123
 124     machine_opts = qemu_get_machine_opts();
 125     kernel_filename = qemu_opt_get(machine_opts, "kernel");
 126     kernel_cmdline = qemu_opt_get(machine_opts, "append");
 127     dtb_arg = qemu_opt_get(machine_opts, "dtb");
 128     /* default to pcbios dtb as passed by machine_init */
 129     if (!dtb_arg && dtb_filename) {
 130         filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename);
 131     }
 132
 133     boot_info.machine_cpu_reset = machine_cpu_reset;
 134     qemu_register_reset(main_cpu_reset, cpu);
 135
 136     if (kernel_filename) {
 137         int kernel_size;
 138         uint64_t entry, low, high;
 139         uint32_t base32;
 140         int big_endian = 0;
 141
 142 #ifdef TARGET_WORDS_BIGENDIAN
 143         big_endian = 1;
 144 #endif
 145
 146         /* Boots a kernel elf binary.  */
 147         kernel_size = load_elf(kernel_filename, NULL, NULL, NULL,
 148                                &entry, &low, &high, NULL,
 149                                big_endian, EM_MICROBLAZE, 0, 0);
 150         base32 = entry;
 151         if (base32 == 0xc0000000) {
 152             kernel_size = load_elf(kernel_filename, NULL,
 153                                    translate_kernel_address, NULL,
 154                                    &entry, NULL, NULL, NULL,
 155                                    big_endian, EM_MICROBLAZE, 0, 0);
 156         }
 157         /* Always boot into physical ram.  */
 158         boot_info.bootstrap_pc = (uint32_t)entry;
 159
 160         /* If it wasn't an ELF image, try an u-boot image.  */
 161         if (kernel_size < 0) {
 162             hwaddr uentry, loadaddr = LOAD_UIMAGE_LOADADDR_INVALID;
 163
 164             kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0,
 165                                       NULL, NULL);
 166             boot_info.bootstrap_pc = uentry;
 167             high = (loadaddr + kernel_size + 3) & ~3;
 168         }
 169
 170         /* Not an ELF image nor an u-boot image, try a RAW image.  */
 171         if (kernel_size < 0) {
 172             kernel_size = load_image_targphys(kernel_filename, ddr_base,
 173                                               ram_size);
 174             boot_info.bootstrap_pc = ddr_base;
 175             high = (ddr_base + kernel_size + 3) & ~3;
 176         }
 177
 178         if (initrd_filename) {
 179             int initrd_size;
 180             uint32_t initrd_offset;
 181
 182             high = ROUND_UP(high + kernel_size, 4);
 183             boot_info.initrd_start = high;
 184             initrd_offset = boot_info.initrd_start - ddr_base;
 185
 186             initrd_size = load_ramdisk(initrd_filename,
 187                                        boot_info.initrd_start,
 188                                        ram_size - initrd_offset);
 189             if (initrd_size < 0) {
 190                 initrd_size = load_image_targphys(initrd_filename,
 191                                                   boot_info.initrd_start,
 192                                                   ram_size - initrd_offset);
 193             }
 194             if (initrd_size < 0) {
 195                 error_report("could not load initrd '%s'",
 196                              initrd_filename);
 197                 exit(EXIT_FAILURE);
 198             }
 199             boot_info.initrd_end = boot_info.initrd_start + initrd_size;
 200             high = ROUND_UP(high + initrd_size, 4);
 201         }
 202
 203         boot_info.cmdline = high + 4096;
 204         if (kernel_cmdline && strlen(kernel_cmdline)) {
 205             pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
 206         }
 207         /* Provide a device-tree.  */
 208         boot_info.fdt = boot_info.cmdline + 4096;
 209         microblaze_load_dtb(boot_info.fdt, ram_size,
 210                             boot_info.initrd_start,
 211                             boot_info.initrd_end,
 212                             kernel_cmdline,
 213                             /* Preference a -dtb argument */
 214                             dtb_arg ? dtb_arg : filename);
 215     }
 216     g_free(filename);
 217 }