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