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     CPUMBState *env = &cpu->env;
  52
  53     cpu_reset(CPU(cpu));
  54     env->regs[5] = boot_info.cmdline;
  55     env->regs[6] = boot_info.initrd_start;
  56     env->regs[7] = boot_info.fdt;
  57     env->sregs[SR_PC] = boot_info.bootstrap_pc;
  58     if (boot_info.machine_cpu_reset) {
  59         boot_info.machine_cpu_reset(cpu);
  60     }
  61 }
  62
  63 static int microblaze_load_dtb(hwaddr addr,
  64                                uint32_t ramsize,
  65                                uint32_t initrd_start,
  66                                uint32_t initrd_end,
  67                                const char *kernel_cmdline,
  68                                const char *dtb_filename)
  69 {
  70     int fdt_size;
  71     void *fdt = NULL;
  72     int r;
  73
  74     if (dtb_filename) {
  75         fdt = load_device_tree(dtb_filename, &fdt_size);
  76     }
  77     if (!fdt) {
  78         return 0;
  79     }
  80
  81     if (kernel_cmdline) {
  82         r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
  83                                     kernel_cmdline);
  84         if (r < 0) {
  85             fprintf(stderr, "couldn't set /chosen/bootargs\n");
  86         }
  87     }
  88
  89     if (initrd_start) {
  90         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start",
  91                               initrd_start);
  92
  93         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end",
  94                               initrd_end);
  95     }
  96
  97     cpu_physical_memory_write(addr, fdt, fdt_size);
  98     return fdt_size;
  99 }
 100
 101 static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
 102 {
 103     return addr - 0x30000000LL;
 104 }
 105
 106 void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base,
 107                             uint32_t ramsize,
 108                             const char *initrd_filename,
 109                             const char *dtb_filename,
 110                             void (*machine_cpu_reset)(MicroBlazeCPU *))
 111 {
 112     QemuOpts *machine_opts;
 113     const char *kernel_filename;
 114     const char *kernel_cmdline;
 115     const char *dtb_arg;
 116
 117     machine_opts = qemu_get_machine_opts();
 118     kernel_filename = qemu_opt_get(machine_opts, "kernel");
 119     kernel_cmdline = qemu_opt_get(machine_opts, "append");
 120     dtb_arg = qemu_opt_get(machine_opts, "dtb");
 121     if (dtb_arg) { /* Preference a -dtb argument */
 122         dtb_filename = dtb_arg;
 123     } else { /* default to pcbios dtb as passed by machine_init */
 124         dtb_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename);
 125     }
 126
 127     boot_info.machine_cpu_reset = machine_cpu_reset;
 128     qemu_register_reset(main_cpu_reset, cpu);
 129
 130     if (kernel_filename) {
 131         int kernel_size;
 132         uint64_t entry, low, high;
 133         uint32_t base32;
 134         int big_endian = 0;
 135
 136 #ifdef TARGET_WORDS_BIGENDIAN
 137         big_endian = 1;
 138 #endif
 139
 140         /* Boots a kernel elf binary.  */
 141         kernel_size = load_elf(kernel_filename, NULL, NULL,
 142                                &entry, &low, &high,
 143                                big_endian, ELF_MACHINE, 0);
 144         base32 = entry;
 145         if (base32 == 0xc0000000) {
 146             kernel_size = load_elf(kernel_filename, translate_kernel_address,
 147                                    NULL, &entry, NULL, NULL,
 148                                    big_endian, ELF_MACHINE, 0);
 149         }
 150         /* Always boot into physical ram.  */
 151         boot_info.bootstrap_pc = ddr_base + (entry & 0x0fffffff);
 152
 153         /* If it wasn't an ELF image, try an u-boot image.  */
 154         if (kernel_size < 0) {
 155             hwaddr uentry, loadaddr;
 156
 157             kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0);
 158             boot_info.bootstrap_pc = uentry;
 159             high = (loadaddr + kernel_size + 3) & ~3;
 160         }
 161
 162         /* Not an ELF image nor an u-boot image, try a RAW image.  */
 163         if (kernel_size < 0) {
 164             kernel_size = load_image_targphys(kernel_filename, ddr_base,
 165                                               ram_size);
 166             boot_info.bootstrap_pc = ddr_base;
 167             high = (ddr_base + kernel_size + 3) & ~3;
 168         }
 169
 170         if (initrd_filename) {
 171             int initrd_size;
 172             uint32_t initrd_offset;
 173
 174             high = ROUND_UP(high + kernel_size, 4);
 175             boot_info.initrd_start = high;
 176             initrd_offset = boot_info.initrd_start - ddr_base;
 177             initrd_size = load_image_targphys(initrd_filename,
 178                                               boot_info.initrd_start,
 179                                               ram_size - initrd_offset);
 180             if (initrd_size < 0) {
 181                 error_report("qemu: could not load initrd '%s'\n",
 182                              initrd_filename);
 183                 exit(EXIT_FAILURE);
 184             }
 185             boot_info.initrd_end = boot_info.initrd_start + initrd_size;
 186             high = ROUND_UP(high + initrd_size, 4);
 187         }
 188
 189         boot_info.cmdline = high + 4096;
 190         if (kernel_cmdline && strlen(kernel_cmdline)) {
 191             pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
 192         }
 193         /* Provide a device-tree.  */
 194         boot_info.fdt = boot_info.cmdline + 4096;
 195         microblaze_load_dtb(boot_info.fdt, ram_size,
 196                             boot_info.initrd_start,
 197                             boot_info.initrd_end,
 198                             kernel_cmdline,
 199                             dtb_filename);
 200     }
 201
 202 }