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; 143 144 /* Boots a kernel elf binary. */ 145 kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, 146 &entry, NULL, &high, NULL, 147 TARGET_BIG_ENDIAN, EM_MICROBLAZE, 0, 0); 148 base32 = entry; 149 if (base32 == 0xc0000000) { 150 kernel_size = load_elf(kernel_filename, NULL, 151 translate_kernel_address, NULL, 152 &entry, NULL, NULL, NULL, 153 TARGET_BIG_ENDIAN, EM_MICROBLAZE, 0, 0); 154 } 155 /* Always boot into physical ram. */ 156 boot_info.bootstrap_pc = (uint32_t)entry; 157 158 /* If it wasn't an ELF image, try an u-boot image. */ 159 if (kernel_size < 0) { 160 hwaddr uentry, loadaddr = LOAD_UIMAGE_LOADADDR_INVALID; 161 162 kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0, 163 NULL, NULL); 164 boot_info.bootstrap_pc = uentry; 165 high = (loadaddr + kernel_size + 3) & ~3; 166 } 167 168 /* Not an ELF image nor an u-boot image, try a RAW image. */ 169 if (kernel_size < 0) { 170 kernel_size = load_image_targphys(kernel_filename, ddr_base, 171 ramsize); 172 boot_info.bootstrap_pc = ddr_base; 173 high = (ddr_base + kernel_size + 3) & ~3; 174 } 175 176 if (initrd_filename) { 177 int initrd_size; 178 uint32_t initrd_offset; 179 180 high = ROUND_UP(high + kernel_size, 4); 181 boot_info.initrd_start = high; 182 initrd_offset = boot_info.initrd_start - ddr_base; 183 184 initrd_size = load_ramdisk(initrd_filename, 185 boot_info.initrd_start, 186 ramsize - initrd_offset); 187 if (initrd_size < 0) { 188 initrd_size = load_image_targphys(initrd_filename, 189 boot_info.initrd_start, 190 ramsize - initrd_offset); 191 } 192 if (initrd_size < 0) { 193 error_report("could not load initrd '%s'", 194 initrd_filename); 195 exit(EXIT_FAILURE); 196 } 197 boot_info.initrd_end = boot_info.initrd_start + initrd_size; 198 high = ROUND_UP(high + initrd_size, 4); 199 } 200 201 boot_info.cmdline = high + 4096; 202 if (kernel_cmdline && strlen(kernel_cmdline)) { 203 pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline); 204 } 205 /* Provide a device-tree. */ 206 boot_info.fdt = boot_info.cmdline + 4096; 207 microblaze_load_dtb(boot_info.fdt, ramsize, 208 boot_info.initrd_start, 209 boot_info.initrd_end, 210 kernel_cmdline, 211 /* Preference a -dtb argument */ 212 dtb_arg ? dtb_arg : filename); 213 } 214 g_free(filename); 215 } 216