xref: /qemu/hw/microblaze/boot.c (revision 66997c42e02c84481fc162a5b7bd6ad6c643bae2)
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/datadir.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/guest-random.h"
34  #include "sysemu/device_tree.h"
35  #include "sysemu/reset.h"
36  #include "hw/boards.h"
37  #include "hw/loader.h"
38  #include "elf.h"
39  #include "qemu/cutils.h"
40  
41  #include "boot.h"
42  
43  static struct
44  {
45      void (*machine_cpu_reset)(MicroBlazeCPU *);
46      uint32_t bootstrap_pc;
47      uint32_t cmdline;
48      uint32_t initrd_start;
49      uint32_t initrd_end;
50      uint32_t fdt;
51  } boot_info;
52  
53  static void main_cpu_reset(void *opaque)
54  {
55      MicroBlazeCPU *cpu = opaque;
56      CPUState *cs = CPU(cpu);
57      CPUMBState *env = &cpu->env;
58  
59      cpu_reset(cs);
60      env->regs[5] = boot_info.cmdline;
61      env->regs[6] = boot_info.initrd_start;
62      env->regs[7] = boot_info.fdt;
63      cpu_set_pc(cs, boot_info.bootstrap_pc);
64      if (boot_info.machine_cpu_reset) {
65          boot_info.machine_cpu_reset(cpu);
66      }
67  }
68  
69  static int microblaze_load_dtb(hwaddr addr,
70                                 uint32_t ramsize,
71                                 uint32_t initrd_start,
72                                 uint32_t initrd_end,
73                                 const char *kernel_cmdline,
74                                 const char *dtb_filename)
75  {
76      int fdt_size;
77      void *fdt = NULL;
78      int r;
79      uint8_t rng_seed[32];
80  
81      if (dtb_filename) {
82          fdt = load_device_tree(dtb_filename, &fdt_size);
83      }
84      if (!fdt) {
85          return 0;
86      }
87  
88      qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
89      qemu_fdt_setprop(fdt, "/chosen", "rng-seed", rng_seed, sizeof(rng_seed));
90  
91      if (kernel_cmdline) {
92          r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
93                                      kernel_cmdline);
94          if (r < 0) {
95              fprintf(stderr, "couldn't set /chosen/bootargs\n");
96          }
97      }
98  
99      if (initrd_start) {
100          qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start",
101                                initrd_start);
102  
103          qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end",
104                                initrd_end);
105      }
106  
107      cpu_physical_memory_write(addr, fdt, fdt_size);
108      g_free(fdt);
109      return fdt_size;
110  }
111  
112  static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
113  {
114      return addr - 0x30000000LL;
115  }
116  
117  void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base,
118                              uint32_t ramsize,
119                              const char *initrd_filename,
120                              const char *dtb_filename,
121                              void (*machine_cpu_reset)(MicroBlazeCPU *))
122  {
123      const char *kernel_filename;
124      const char *kernel_cmdline;
125      const char *dtb_arg;
126      char *filename = NULL;
127  
128      kernel_filename = current_machine->kernel_filename;
129      kernel_cmdline = current_machine->kernel_cmdline;
130      dtb_arg = current_machine->dtb;
131      /* default to pcbios dtb as passed by machine_init */
132      if (!dtb_arg && dtb_filename) {
133          filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename);
134      }
135  
136      boot_info.machine_cpu_reset = machine_cpu_reset;
137      qemu_register_reset(main_cpu_reset, cpu);
138  
139      if (kernel_filename) {
140          int kernel_size;
141          uint64_t entry, high;
142          uint32_t base32;
143          int big_endian = 0;
144  
145  #if TARGET_BIG_ENDIAN
146          big_endian = 1;
147  #endif
148  
149          /* Boots a kernel elf binary.  */
150          kernel_size = load_elf(kernel_filename, NULL, NULL, NULL,
151                                 &entry, NULL, &high, NULL,
152                                 big_endian, EM_MICROBLAZE, 0, 0);
153          base32 = entry;
154          if (base32 == 0xc0000000) {
155              kernel_size = load_elf(kernel_filename, NULL,
156                                     translate_kernel_address, NULL,
157                                     &entry, NULL, NULL, NULL,
158                                     big_endian, EM_MICROBLAZE, 0, 0);
159          }
160          /* Always boot into physical ram.  */
161          boot_info.bootstrap_pc = (uint32_t)entry;
162  
163          /* If it wasn't an ELF image, try an u-boot image.  */
164          if (kernel_size < 0) {
165              hwaddr uentry, loadaddr = LOAD_UIMAGE_LOADADDR_INVALID;
166  
167              kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0,
168                                        NULL, NULL);
169              boot_info.bootstrap_pc = uentry;
170              high = (loadaddr + kernel_size + 3) & ~3;
171          }
172  
173          /* Not an ELF image nor an u-boot image, try a RAW image.  */
174          if (kernel_size < 0) {
175              kernel_size = load_image_targphys(kernel_filename, ddr_base,
176                                                ramsize);
177              boot_info.bootstrap_pc = ddr_base;
178              high = (ddr_base + kernel_size + 3) & ~3;
179          }
180  
181          if (initrd_filename) {
182              int initrd_size;
183              uint32_t initrd_offset;
184  
185              high = ROUND_UP(high + kernel_size, 4);
186              boot_info.initrd_start = high;
187              initrd_offset = boot_info.initrd_start - ddr_base;
188  
189              initrd_size = load_ramdisk(initrd_filename,
190                                         boot_info.initrd_start,
191                                         ramsize - initrd_offset);
192              if (initrd_size < 0) {
193                  initrd_size = load_image_targphys(initrd_filename,
194                                                    boot_info.initrd_start,
195                                                    ramsize - initrd_offset);
196              }
197              if (initrd_size < 0) {
198                  error_report("could not load initrd '%s'",
199                               initrd_filename);
200                  exit(EXIT_FAILURE);
201              }
202              boot_info.initrd_end = boot_info.initrd_start + initrd_size;
203              high = ROUND_UP(high + initrd_size, 4);
204          }
205  
206          boot_info.cmdline = high + 4096;
207          if (kernel_cmdline && strlen(kernel_cmdline)) {
208              pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
209          }
210          /* Provide a device-tree.  */
211          boot_info.fdt = boot_info.cmdline + 4096;
212          microblaze_load_dtb(boot_info.fdt, ramsize,
213                              boot_info.initrd_start,
214                              boot_info.initrd_end,
215                              kernel_cmdline,
216                              /* Preference a -dtb argument */
217                              dtb_arg ? dtb_arg : filename);
218      }
219      g_free(filename);
220  }
221