qemu/hw/microblaze/boot.c
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   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 "qemu-common.h"
  34#include "sysemu/device_tree.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
  42static 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
  52static 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
  68static 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    return fdt_size;
 104}
 105
 106static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
 107{
 108    return addr - 0x30000000LL;
 109}
 110
 111void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base,
 112                            uint32_t ramsize,
 113                            const char *initrd_filename,
 114                            const char *dtb_filename,
 115                            void (*machine_cpu_reset)(MicroBlazeCPU *))
 116{
 117    QemuOpts *machine_opts;
 118    const char *kernel_filename;
 119    const char *kernel_cmdline;
 120    const char *dtb_arg;
 121    char *filename = NULL;
 122
 123    machine_opts = qemu_get_machine_opts();
 124    kernel_filename = qemu_opt_get(machine_opts, "kernel");
 125    kernel_cmdline = qemu_opt_get(machine_opts, "append");
 126    dtb_arg = qemu_opt_get(machine_opts, "dtb");
 127    /* default to pcbios dtb as passed by machine_init */
 128    if (!dtb_arg) {
 129        filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename);
 130    }
 131
 132    boot_info.machine_cpu_reset = machine_cpu_reset;
 133    qemu_register_reset(main_cpu_reset, cpu);
 134
 135    if (kernel_filename) {
 136        int kernel_size;
 137        uint64_t entry, low, high;
 138        uint32_t base32;
 139        int big_endian = 0;
 140
 141#ifdef TARGET_WORDS_BIGENDIAN
 142        big_endian = 1;
 143#endif
 144
 145        /* Boots a kernel elf binary.  */
 146        kernel_size = load_elf(kernel_filename, NULL, NULL,
 147                               &entry, &low, &high,
 148                               big_endian, EM_MICROBLAZE, 0, 0);
 149        base32 = entry;
 150        if (base32 == 0xc0000000) {
 151            kernel_size = load_elf(kernel_filename, translate_kernel_address,
 152                                   NULL, &entry, NULL, NULL,
 153                                   big_endian, EM_MICROBLAZE, 0, 0);
 154        }
 155        /* Always boot into physical ram.  */
 156        boot_info.bootstrap_pc = (uint32_t)entry;
 157
 158        /* If it wasn't an ELF image, try an u-boot image.  */
 159        if (kernel_size < 0) {
 160            hwaddr uentry, loadaddr;
 161
 162            kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0,
 163                                      NULL, NULL);
 164            boot_info.bootstrap_pc = uentry;
 165            high = (loadaddr + kernel_size + 3) & ~3;
 166        }
 167
 168        /* Not an ELF image nor an u-boot image, try a RAW image.  */
 169        if (kernel_size < 0) {
 170            kernel_size = load_image_targphys(kernel_filename, ddr_base,
 171                                              ram_size);
 172            boot_info.bootstrap_pc = ddr_base;
 173            high = (ddr_base + kernel_size + 3) & ~3;
 174        }
 175
 176        if (initrd_filename) {
 177            int initrd_size;
 178            uint32_t initrd_offset;
 179
 180            high = ROUND_UP(high + kernel_size, 4);
 181            boot_info.initrd_start = high;
 182            initrd_offset = boot_info.initrd_start - ddr_base;
 183
 184            initrd_size = load_ramdisk(initrd_filename,
 185                                       boot_info.initrd_start,
 186                                       ram_size - initrd_offset);
 187            if (initrd_size < 0) {
 188                initrd_size = load_image_targphys(initrd_filename,
 189                                                  boot_info.initrd_start,
 190                                                  ram_size - initrd_offset);
 191            }
 192            if (initrd_size < 0) {
 193                error_report("qemu: could not load initrd '%s'",
 194                             initrd_filename);
 195                exit(EXIT_FAILURE);
 196            }
 197            boot_info.initrd_end = boot_info.initrd_start + initrd_size;
 198            high = ROUND_UP(high + initrd_size, 4);
 199        }
 200
 201        boot_info.cmdline = high + 4096;
 202        if (kernel_cmdline && strlen(kernel_cmdline)) {
 203            pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
 204        }
 205        /* Provide a device-tree.  */
 206        boot_info.fdt = boot_info.cmdline + 4096;
 207        microblaze_load_dtb(boot_info.fdt, ram_size,
 208                            boot_info.initrd_start,
 209                            boot_info.initrd_end,
 210                            kernel_cmdline,
 211                            /* Preference a -dtb argument */
 212                            dtb_arg ? dtb_arg : filename);
 213    }
 214    g_free(filename);
 215}
 216