1 /* 2 * Nios2 kernel loader 3 * 4 * Copyright (c) 2016 Marek Vasut <marek.vasut@gmail.com> 5 * 6 * Based on microblaze kernel loader 7 * 8 * Copyright (c) 2012 Peter Crosthwaite <peter.crosthwaite@petalogix.com> 9 * Copyright (c) 2012 PetaLogix 10 * Copyright (c) 2009 Edgar E. Iglesias. 11 * 12 * Permission is hereby granted, free of charge, to any person obtaining a copy 13 * of this software and associated documentation files (the "Software"), to deal 14 * in the Software without restriction, including without limitation the rights 15 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 16 * copies of the Software, and to permit persons to whom the Software is 17 * furnished to do so, subject to the following conditions: 18 * 19 * The above copyright notice and this permission notice shall be included in 20 * all copies or substantial portions of the Software. 21 * 22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 25 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 27 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 28 * THE SOFTWARE. 29 */ 30 31 #include "qemu/osdep.h" 32 #include "qemu/units.h" 33 #include "qemu/datadir.h" 34 #include "qemu/option.h" 35 #include "qemu/config-file.h" 36 #include "qemu/error-report.h" 37 #include "qemu/guest-random.h" 38 #include "sysemu/device_tree.h" 39 #include "sysemu/reset.h" 40 #include "hw/boards.h" 41 #include "hw/loader.h" 42 #include "elf.h" 43 44 #include "boot.h" 45 46 #define NIOS2_MAGIC 0x534f494e 47 48 static struct nios2_boot_info { 49 void (*machine_cpu_reset)(Nios2CPU *); 50 uint32_t bootstrap_pc; 51 uint32_t cmdline; 52 uint32_t initrd_start; 53 uint32_t initrd_end; 54 uint32_t fdt; 55 } boot_info; 56 57 static void main_cpu_reset(void *opaque) 58 { 59 Nios2CPU *cpu = opaque; 60 CPUState *cs = CPU(cpu); 61 CPUNios2State *env = &cpu->env; 62 63 cpu_reset(CPU(cpu)); 64 65 env->regs[R_ARG0] = NIOS2_MAGIC; 66 env->regs[R_ARG1] = boot_info.initrd_start; 67 env->regs[R_ARG2] = boot_info.fdt; 68 env->regs[R_ARG3] = boot_info.cmdline; 69 70 cpu_set_pc(cs, boot_info.bootstrap_pc); 71 if (boot_info.machine_cpu_reset) { 72 boot_info.machine_cpu_reset(cpu); 73 } 74 } 75 76 static uint64_t translate_kernel_address(void *opaque, uint64_t addr) 77 { 78 return addr - 0xc0000000LL; 79 } 80 81 static int nios2_load_dtb(struct nios2_boot_info bi, const uint32_t ramsize, 82 const char *kernel_cmdline, const char *dtb_filename) 83 { 84 int fdt_size; 85 void *fdt = NULL; 86 int r; 87 uint8_t rng_seed[32]; 88 89 if (dtb_filename) { 90 fdt = load_device_tree(dtb_filename, &fdt_size); 91 } 92 if (!fdt) { 93 return 0; 94 } 95 96 qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed)); 97 qemu_fdt_setprop(fdt, "/chosen", "rng-seed", rng_seed, sizeof(rng_seed)); 98 99 if (kernel_cmdline) { 100 r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", 101 kernel_cmdline); 102 if (r < 0) { 103 fprintf(stderr, "couldn't set /chosen/bootargs\n"); 104 } 105 } 106 107 if (bi.initrd_start) { 108 qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start", 109 translate_kernel_address(NULL, bi.initrd_start)); 110 111 qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end", 112 translate_kernel_address(NULL, bi.initrd_end)); 113 } 114 115 cpu_physical_memory_write(bi.fdt, fdt, fdt_size); 116 g_free(fdt); 117 return fdt_size; 118 } 119 120 void nios2_load_kernel(Nios2CPU *cpu, hwaddr ddr_base, 121 uint32_t ramsize, 122 const char *initrd_filename, 123 const char *dtb_filename, 124 void (*machine_cpu_reset)(Nios2CPU *)) 125 { 126 const char *kernel_filename; 127 const char *kernel_cmdline; 128 const char *dtb_arg; 129 char *filename = NULL; 130 131 kernel_filename = current_machine->kernel_filename; 132 kernel_cmdline = current_machine->kernel_cmdline; 133 dtb_arg = current_machine->dtb; 134 /* default to pcbios dtb as passed by machine_init */ 135 if (!dtb_arg) { 136 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename); 137 } 138 139 boot_info.machine_cpu_reset = machine_cpu_reset; 140 qemu_register_reset(main_cpu_reset, cpu); 141 142 if (kernel_filename) { 143 int kernel_size, fdt_size; 144 uint64_t entry, high; 145 int big_endian = 0; 146 147 #if TARGET_BIG_ENDIAN 148 big_endian = 1; 149 #endif 150 151 /* Boots a kernel elf binary. */ 152 kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, 153 &entry, NULL, &high, NULL, 154 big_endian, EM_ALTERA_NIOS2, 0, 0); 155 if ((uint32_t)entry == 0xc0000000) { 156 /* 157 * The Nios II processor reference guide documents that the 158 * kernel is placed at virtual memory address 0xc0000000, 159 * and we've got something that points there. Reload it 160 * and adjust the entry to get the address in physical RAM. 161 */ 162 kernel_size = load_elf(kernel_filename, NULL, 163 translate_kernel_address, NULL, 164 &entry, NULL, NULL, NULL, 165 big_endian, EM_ALTERA_NIOS2, 0, 0); 166 boot_info.bootstrap_pc = ddr_base + 0xc0000000 + 167 (entry & 0x07ffffff); 168 } else { 169 /* Use the entry point in the ELF image. */ 170 boot_info.bootstrap_pc = (uint32_t)entry; 171 } 172 173 /* If it wasn't an ELF image, try an u-boot image. */ 174 if (kernel_size < 0) { 175 hwaddr uentry, loadaddr = LOAD_UIMAGE_LOADADDR_INVALID; 176 177 kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0, 178 NULL, NULL); 179 boot_info.bootstrap_pc = uentry; 180 high = loadaddr + kernel_size; 181 } 182 183 /* Not an ELF image nor an u-boot image, try a RAW image. */ 184 if (kernel_size < 0) { 185 kernel_size = load_image_targphys(kernel_filename, ddr_base, 186 ramsize); 187 boot_info.bootstrap_pc = ddr_base; 188 high = ddr_base + kernel_size; 189 } 190 191 high = ROUND_UP(high, 1 * MiB); 192 193 /* If initrd is available, it goes after the kernel, aligned to 1M. */ 194 if (initrd_filename) { 195 int initrd_size; 196 uint32_t initrd_offset; 197 198 boot_info.initrd_start = high; 199 initrd_offset = boot_info.initrd_start - ddr_base; 200 201 initrd_size = load_ramdisk(initrd_filename, 202 boot_info.initrd_start, 203 ramsize - initrd_offset); 204 if (initrd_size < 0) { 205 initrd_size = load_image_targphys(initrd_filename, 206 boot_info.initrd_start, 207 ramsize - initrd_offset); 208 } 209 if (initrd_size < 0) { 210 error_report("could not load initrd '%s'", 211 initrd_filename); 212 exit(EXIT_FAILURE); 213 } 214 high += initrd_size; 215 } 216 high = ROUND_UP(high, 4); 217 boot_info.initrd_end = high; 218 219 /* Device tree must be placed right after initrd (if available) */ 220 boot_info.fdt = high; 221 fdt_size = nios2_load_dtb(boot_info, ramsize, kernel_cmdline, 222 /* Preference a -dtb argument */ 223 dtb_arg ? dtb_arg : filename); 224 high += fdt_size; 225 226 /* Kernel command is at the end, 4k aligned. */ 227 boot_info.cmdline = ROUND_UP(high, 4 * KiB); 228 if (kernel_cmdline && strlen(kernel_cmdline)) { 229 pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline); 230 } 231 } 232 g_free(filename); 233 } 234