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-common.h"
  30 #include "sysemu/device_tree.h"
  31 #include "sysemu/sysemu.h"
  32 #include "hw/loader.h"
  33 #include "elf.h"
  34
  35 #include "boot.h"
  36
  37 static struct
  38 {
  39     void (*machine_cpu_reset)(MicroBlazeCPU *);
  40     uint32_t bootstrap_pc;
  41     uint32_t cmdline;
  42     uint32_t fdt;
  43 } boot_info;
  44
  45 static void main_cpu_reset(void *opaque)
  46 {
  47     MicroBlazeCPU *cpu = opaque;
  48     CPUMBState *env = &cpu->env;
  49
  50     cpu_reset(CPU(cpu));
  51     env->regs[5] = boot_info.cmdline;
  52     env->regs[7] = boot_info.fdt;
  53     env->sregs[SR_PC] = boot_info.bootstrap_pc;
  54     if (boot_info.machine_cpu_reset) {
  55         boot_info.machine_cpu_reset(cpu);
  56     }
  57 }
  58
  59 static int microblaze_load_dtb(hwaddr addr,
  60                                       uint32_t ramsize,
  61                                       const char *kernel_cmdline,
  62                                       const char *dtb_filename)
  63 {
  64     int fdt_size;
  65     void *fdt = NULL;
  66     int r;
  67
  68     if (dtb_filename) {
  69         fdt = load_device_tree(dtb_filename, &fdt_size);
  70     }
  71     if (!fdt) {
  72         return 0;
  73     }
  74
  75     if (kernel_cmdline) {
  76         r = qemu_devtree_setprop_string(fdt, "/chosen", "bootargs",
  77                                                         kernel_cmdline);
  78         if (r < 0) {
  79             fprintf(stderr, "couldn't set /chosen/bootargs\n");
  80         }
  81     }
  82
  83     cpu_physical_memory_write(addr, fdt, fdt_size);
  84     return fdt_size;
  85 }
  86
  87 static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
  88 {
  89     return addr - 0x30000000LL;
  90 }
  91
  92 void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base,
  93                             uint32_t ramsize, const char *dtb_filename,
  94                             void (*machine_cpu_reset)(MicroBlazeCPU *))
  95 {
  96     QemuOpts *machine_opts;
  97     const char *kernel_filename;
  98     const char *kernel_cmdline;
  99     const char *dtb_arg;
 100
 101     machine_opts = qemu_get_machine_opts();
 102     kernel_filename = qemu_opt_get(machine_opts, "kernel");
 103     kernel_cmdline = qemu_opt_get(machine_opts, "append");
 104     dtb_arg = qemu_opt_get(machine_opts, "dtb");
 105     if (dtb_arg) { /* Preference a -dtb argument */
 106         dtb_filename = dtb_arg;
 107     } else { /* default to pcbios dtb as passed by machine_init */
 108         dtb_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename);
 109     }
 110
 111     boot_info.machine_cpu_reset = machine_cpu_reset;
 112     qemu_register_reset(main_cpu_reset, cpu);
 113
 114     if (kernel_filename) {
 115         int kernel_size;
 116         uint64_t entry, low, high;
 117         uint32_t base32;
 118         int big_endian = 0;
 119
 120 #ifdef TARGET_WORDS_BIGENDIAN
 121         big_endian = 1;
 122 #endif
 123
 124         /* Boots a kernel elf binary.  */
 125         kernel_size = load_elf(kernel_filename, NULL, NULL,
 126                                &entry, &low, &high,
 127                                big_endian, ELF_MACHINE, 0);
 128         base32 = entry;
 129         if (base32 == 0xc0000000) {
 130             kernel_size = load_elf(kernel_filename, translate_kernel_address,
 131                                    NULL, &entry, NULL, NULL,
 132                                    big_endian, ELF_MACHINE, 0);
 133         }
 134         /* Always boot into physical ram.  */
 135         boot_info.bootstrap_pc = ddr_base + (entry & 0x0fffffff);
 136
 137         /* If it wasn't an ELF image, try an u-boot image.  */
 138         if (kernel_size < 0) {
 139             hwaddr uentry, loadaddr;
 140
 141             kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0);
 142             boot_info.bootstrap_pc = uentry;
 143             high = (loadaddr + kernel_size + 3) & ~3;
 144         }
 145
 146         /* Not an ELF image nor an u-boot image, try a RAW image.  */
 147         if (kernel_size < 0) {
 148             kernel_size = load_image_targphys(kernel_filename, ddr_base,
 149                                               ram_size);
 150             boot_info.bootstrap_pc = ddr_base;
 151             high = (ddr_base + kernel_size + 3) & ~3;
 152         }
 153
 154         boot_info.cmdline = high + 4096;
 155         if (kernel_cmdline && strlen(kernel_cmdline)) {
 156             pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
 157         }
 158         /* Provide a device-tree.  */
 159         boot_info.fdt = boot_info.cmdline + 4096;
 160         microblaze_load_dtb(boot_info.fdt, ram_size, kernel_cmdline,
 161                                                      dtb_filename);
 162     }
 163
 164 }