qemu

boot.c (7652B)

---

 /*
  * Microblaze kernel loader
  *
  * Copyright (c) 2012 Peter Crosthwaite <peter.crosthwaite@petalogix.com>
  * Copyright (c) 2012 PetaLogix
  * Copyright (c) 2009 Edgar E. Iglesias.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
 
 #include "qemu/osdep.h"
 #include "qemu/datadir.h"
 #include "cpu.h"
 #include "qemu/option.h"
 #include "qemu/config-file.h"
 #include "qemu/error-report.h"
 #include "qemu/guest-random.h"
 #include "sysemu/device_tree.h"
 #include "sysemu/reset.h"
 #include "hw/boards.h"
 #include "hw/loader.h"
 #include "elf.h"
 #include "qemu/cutils.h"
 
 #include "boot.h"
 
 static struct
 {
     void (*machine_cpu_reset)(MicroBlazeCPU *);
     uint32_t bootstrap_pc;
     uint32_t cmdline;
     uint32_t initrd_start;
     uint32_t initrd_end;
     uint32_t fdt;
 } boot_info;
 
 static void main_cpu_reset(void *opaque)
 {
     MicroBlazeCPU *cpu = opaque;
     CPUState *cs = CPU(cpu);
     CPUMBState *env = &cpu->env;
 
     cpu_reset(cs);
     env->regs[5] = boot_info.cmdline;
     env->regs[6] = boot_info.initrd_start;
     env->regs[7] = boot_info.fdt;
     cpu_set_pc(cs, boot_info.bootstrap_pc);
     if (boot_info.machine_cpu_reset) {
         boot_info.machine_cpu_reset(cpu);
     }
 }
 
 static int microblaze_load_dtb(hwaddr addr,
                                uint32_t ramsize,
                                uint32_t initrd_start,
                                uint32_t initrd_end,
                                const char *kernel_cmdline,
                                const char *dtb_filename)
 {
     int fdt_size;
     void *fdt = NULL;
     int r;
     uint8_t rng_seed[32];
 
     if (dtb_filename) {
         fdt = load_device_tree(dtb_filename, &fdt_size);
     }
     if (!fdt) {
         return 0;
     }
 
     qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
     qemu_fdt_setprop(fdt, "/chosen", "rng-seed", rng_seed, sizeof(rng_seed));
 
     if (kernel_cmdline) {
         r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
                                     kernel_cmdline);
         if (r < 0) {
             fprintf(stderr, "couldn't set /chosen/bootargs\n");
         }
     }
 
     if (initrd_start) {
         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start",
                               initrd_start);
 
         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end",
                               initrd_end);
     }
 
     cpu_physical_memory_write(addr, fdt, fdt_size);
     g_free(fdt);
     return fdt_size;
 }
 
 static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
 {
     return addr - 0x30000000LL;
 }
 
 void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base,
                             uint32_t ramsize,
                             const char *initrd_filename,
                             const char *dtb_filename,
                             void (*machine_cpu_reset)(MicroBlazeCPU *))
 {
     const char *kernel_filename;
     const char *kernel_cmdline;
     const char *dtb_arg;
     char *filename = NULL;
 
     kernel_filename = current_machine->kernel_filename;
     kernel_cmdline = current_machine->kernel_cmdline;
     dtb_arg = current_machine->dtb;
     /* default to pcbios dtb as passed by machine_init */
     if (!dtb_arg && dtb_filename) {
         filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename);
     }
 
     boot_info.machine_cpu_reset = machine_cpu_reset;
     qemu_register_reset(main_cpu_reset, cpu);
 
     if (kernel_filename) {
         int kernel_size;
         uint64_t entry, high;
         uint32_t base32;
         int big_endian = 0;
 
 #if TARGET_BIG_ENDIAN
         big_endian = 1;
 #endif
 
         /* Boots a kernel elf binary.  */
         kernel_size = load_elf(kernel_filename, NULL, NULL, NULL,
                                &entry, NULL, &high, NULL,
                                big_endian, EM_MICROBLAZE, 0, 0);
         base32 = entry;
         if (base32 == 0xc0000000) {
             kernel_size = load_elf(kernel_filename, NULL,
                                    translate_kernel_address, NULL,
                                    &entry, NULL, NULL, NULL,
                                    big_endian, EM_MICROBLAZE, 0, 0);
         }
         /* Always boot into physical ram.  */
         boot_info.bootstrap_pc = (uint32_t)entry;
 
         /* If it wasn't an ELF image, try an u-boot image.  */
         if (kernel_size < 0) {
             hwaddr uentry, loadaddr = LOAD_UIMAGE_LOADADDR_INVALID;
 
             kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0,
                                       NULL, NULL);
             boot_info.bootstrap_pc = uentry;
             high = (loadaddr + kernel_size + 3) & ~3;
         }
 
         /* Not an ELF image nor an u-boot image, try a RAW image.  */
         if (kernel_size < 0) {
             kernel_size = load_image_targphys(kernel_filename, ddr_base,
                                               ramsize);
             boot_info.bootstrap_pc = ddr_base;
             high = (ddr_base + kernel_size + 3) & ~3;
         }
 
         if (initrd_filename) {
             int initrd_size;
             uint32_t initrd_offset;
 
             high = ROUND_UP(high + kernel_size, 4);
             boot_info.initrd_start = high;
             initrd_offset = boot_info.initrd_start - ddr_base;
 
             initrd_size = load_ramdisk(initrd_filename,
                                        boot_info.initrd_start,
                                        ramsize - initrd_offset);
             if (initrd_size < 0) {
                 initrd_size = load_image_targphys(initrd_filename,
                                                   boot_info.initrd_start,
                                                   ramsize - initrd_offset);
             }
             if (initrd_size < 0) {
                 error_report("could not load initrd '%s'",
                              initrd_filename);
                 exit(EXIT_FAILURE);
             }
             boot_info.initrd_end = boot_info.initrd_start + initrd_size;
             high = ROUND_UP(high + initrd_size, 4);
         }
 
         boot_info.cmdline = high + 4096;
         if (kernel_cmdline && strlen(kernel_cmdline)) {
             pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
         }
         /* Provide a device-tree.  */
         boot_info.fdt = boot_info.cmdline + 4096;
         microblaze_load_dtb(boot_info.fdt, ramsize,
                             boot_info.initrd_start,
                             boot_info.initrd_end,
                             kernel_cmdline,
                             /* Preference a -dtb argument */
                             dtb_arg ? dtb_arg : filename);
     }
     g_free(filename);
 }