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