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.h"
  29 #include "qemu-common.h"
  30 #include "device_tree.h"
  31 #include "loader.h"
  32 #include "elf.h"
  33
  34 #include "microblaze_boot.h"
  35
  36 static struct
  37 {
  38     void (*machine_cpu_reset)(MicroBlazeCPU *);
  39     uint32_t bootstrap_pc;
  40     uint32_t cmdline;
  41     uint32_t fdt;
  42 } boot_info;
  43
  44 static void main_cpu_reset(void *opaque)
  45 {
  46     MicroBlazeCPU *cpu = opaque;
  47     CPUMBState *env = &cpu->env;
  48
  49     cpu_reset(CPU(cpu));
  50     env->regs[5] = boot_info.cmdline;
  51     env->regs[7] = boot_info.fdt;
  52     env->sregs[SR_PC] = boot_info.bootstrap_pc;
  53     if (boot_info.machine_cpu_reset) {
  54         boot_info.machine_cpu_reset(cpu);
  55     }
  56 }
  57
  58 static int microblaze_load_dtb(target_phys_addr_t addr,
  59                                       uint32_t ramsize,
  60                                       const char *kernel_cmdline,
  61                                       const char *dtb_filename)
  62 {
  63     int fdt_size;
  64 #ifdef CONFIG_FDT
  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, (void *)fdt, fdt_size);
  84 #else
  85     /* We lack libfdt so we cannot manipulate the fdt. Just pass on the blob
  86        to the kernel.  */
  87     if (dtb_filename) {
  88         fdt_size = load_image_targphys(dtb_filename, addr, 0x10000);
  89     }
  90     if (kernel_cmdline) {
  91         fprintf(stderr,
  92                 "Warning: missing libfdt, cannot pass cmdline to kernel!\n");
  93     }
  94 #endif
  95     return fdt_size;
  96 }
  97
  98 static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
  99 {
 100     return addr - 0x30000000LL;
 101 }
 102
 103 void microblaze_load_kernel(MicroBlazeCPU *cpu, target_phys_addr_t ddr_base,
 104                             uint32_t ramsize, const char *dtb_filename,
 105                             void (*machine_cpu_reset)(MicroBlazeCPU *))
 106 {
 107     QemuOpts *machine_opts;
 108     const char *kernel_filename = NULL;
 109     const char *kernel_cmdline = NULL;
 110
 111     machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
 112     if (machine_opts) {
 113         const char *dtb_arg;
 114         kernel_filename = qemu_opt_get(machine_opts, "kernel");
 115         kernel_cmdline = qemu_opt_get(machine_opts, "append");
 116         dtb_arg = qemu_opt_get(machine_opts, "dtb");
 117         if (dtb_arg) { /* Preference a -dtb argument */
 118             dtb_filename = dtb_arg;
 119         } else { /* default to pcbios dtb as passed by machine_init */
 120             dtb_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename);
 121         }
 122     }
 123
 124     boot_info.machine_cpu_reset = machine_cpu_reset;
 125     qemu_register_reset(main_cpu_reset, cpu);
 126
 127     if (kernel_filename) {
 128         int kernel_size;
 129         uint64_t entry, low, high;
 130         uint32_t base32;
 131         int big_endian = 0;
 132
 133 #ifdef TARGET_WORDS_BIGENDIAN
 134         big_endian = 1;
 135 #endif
 136
 137         /* Boots a kernel elf binary.  */
 138         kernel_size = load_elf(kernel_filename, NULL, NULL,
 139                                &entry, &low, &high,
 140                                big_endian, ELF_MACHINE, 0);
 141         base32 = entry;
 142         if (base32 == 0xc0000000) {
 143             kernel_size = load_elf(kernel_filename, translate_kernel_address,
 144                                    NULL, &entry, NULL, NULL,
 145                                    big_endian, ELF_MACHINE, 0);
 146         }
 147         /* Always boot into physical ram.  */
 148         boot_info.bootstrap_pc = ddr_base + (entry & 0x0fffffff);
 149
 150         /* If it wasn't an ELF image, try an u-boot image.  */
 151         if (kernel_size < 0) {
 152             target_phys_addr_t uentry, loadaddr;
 153
 154             kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0);
 155             boot_info.bootstrap_pc = uentry;
 156             high = (loadaddr + kernel_size + 3) & ~3;
 157         }
 158
 159         /* Not an ELF image nor an u-boot image, try a RAW image.  */
 160         if (kernel_size < 0) {
 161             kernel_size = load_image_targphys(kernel_filename, ddr_base,
 162                                               ram_size);
 163             boot_info.bootstrap_pc = ddr_base;
 164             high = (ddr_base + kernel_size + 3) & ~3;
 165         }
 166
 167         boot_info.cmdline = high + 4096;
 168         if (kernel_cmdline && strlen(kernel_cmdline)) {
 169             pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
 170         }
 171         /* Provide a device-tree.  */
 172         boot_info.fdt = boot_info.cmdline + 4096;
 173         microblaze_load_dtb(boot_info.fdt, ram_size, kernel_cmdline,
 174                                                      dtb_filename);
 175     }
 176
 177 }