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-common.h" 34 #include "cpu.h" 35 #include "qemu/option.h" 36 #include "qemu/config-file.h" 37 #include "qemu/error-report.h" 38 #include "sysemu/device_tree.h" 39 #include "sysemu/sysemu.h" 40 #include "hw/loader.h" 41 #include "elf.h" 42 43 #include "boot.h" 44 45 #define NIOS2_MAGIC 0x534f494e 46 47 static struct nios2_boot_info { 48 void (*machine_cpu_reset)(Nios2CPU *); 49 uint32_t bootstrap_pc; 50 uint32_t cmdline; 51 uint32_t initrd_start; 52 uint32_t initrd_end; 53 uint32_t fdt; 54 } boot_info; 55 56 static void main_cpu_reset(void *opaque) 57 { 58 Nios2CPU *cpu = opaque; 59 CPUState *cs = CPU(cpu); 60 CPUNios2State *env = &cpu->env; 61 62 cpu_reset(CPU(cpu)); 63 64 env->regs[R_ARG0] = NIOS2_MAGIC; 65 env->regs[R_ARG1] = boot_info.initrd_start; 66 env->regs[R_ARG2] = boot_info.fdt; 67 env->regs[R_ARG3] = boot_info.cmdline; 68 69 cpu_set_pc(cs, boot_info.bootstrap_pc); 70 if (boot_info.machine_cpu_reset) { 71 boot_info.machine_cpu_reset(cpu); 72 } 73 } 74 75 static uint64_t translate_kernel_address(void *opaque, uint64_t addr) 76 { 77 return addr - 0xc0000000LL; 78 } 79 80 static int nios2_load_dtb(struct nios2_boot_info bi, const uint32_t ramsize, 81 const char *kernel_cmdline, const char *dtb_filename) 82 { 83 int fdt_size; 84 void *fdt = NULL; 85 int r; 86 87 if (dtb_filename) { 88 fdt = load_device_tree(dtb_filename, &fdt_size); 89 } 90 if (!fdt) { 91 return 0; 92 } 93 94 if (kernel_cmdline) { 95 r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", 96 kernel_cmdline); 97 if (r < 0) { 98 fprintf(stderr, "couldn't set /chosen/bootargs\n"); 99 } 100 } 101 102 if (bi.initrd_start) { 103 qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start", 104 translate_kernel_address(NULL, bi.initrd_start)); 105 106 qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end", 107 translate_kernel_address(NULL, bi.initrd_end)); 108 } 109 110 cpu_physical_memory_write(bi.fdt, fdt, fdt_size); 111 return fdt_size; 112 } 113 114 void nios2_load_kernel(Nios2CPU *cpu, hwaddr ddr_base, 115 uint32_t ramsize, 116 const char *initrd_filename, 117 const char *dtb_filename, 118 void (*machine_cpu_reset)(Nios2CPU *)) 119 { 120 QemuOpts *machine_opts; 121 const char *kernel_filename; 122 const char *kernel_cmdline; 123 const char *dtb_arg; 124 char *filename = NULL; 125 126 machine_opts = qemu_get_machine_opts(); 127 kernel_filename = qemu_opt_get(machine_opts, "kernel"); 128 kernel_cmdline = qemu_opt_get(machine_opts, "append"); 129 dtb_arg = qemu_opt_get(machine_opts, "dtb"); 130 /* default to pcbios dtb as passed by machine_init */ 131 if (!dtb_arg) { 132 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename); 133 } 134 135 boot_info.machine_cpu_reset = machine_cpu_reset; 136 qemu_register_reset(main_cpu_reset, cpu); 137 138 if (kernel_filename) { 139 int kernel_size, fdt_size; 140 uint64_t entry, low, high; 141 uint32_t base32; 142 int big_endian = 0; 143 144 #ifdef TARGET_WORDS_BIGENDIAN 145 big_endian = 1; 146 #endif 147 148 /* Boots a kernel elf binary. */ 149 kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, 150 &entry, &low, &high, 151 big_endian, EM_ALTERA_NIOS2, 0, 0); 152 base32 = entry; 153 if (base32 == 0xc0000000) { 154 kernel_size = load_elf(kernel_filename, NULL, 155 translate_kernel_address, NULL, 156 &entry, NULL, NULL, 157 big_endian, EM_ALTERA_NIOS2, 0, 0); 158 } 159 160 /* Always boot into physical ram. */ 161 boot_info.bootstrap_pc = ddr_base + 0xc0000000 + (entry & 0x07ffffff); 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; 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 ram_size); 177 boot_info.bootstrap_pc = ddr_base; 178 high = ddr_base + kernel_size; 179 } 180 181 high = ROUND_UP(high, 1 * MiB); 182 183 /* If initrd is available, it goes after the kernel, aligned to 1M. */ 184 if (initrd_filename) { 185 int initrd_size; 186 uint32_t initrd_offset; 187 188 boot_info.initrd_start = high; 189 initrd_offset = boot_info.initrd_start - ddr_base; 190 191 initrd_size = load_ramdisk(initrd_filename, 192 boot_info.initrd_start, 193 ram_size - initrd_offset); 194 if (initrd_size < 0) { 195 initrd_size = load_image_targphys(initrd_filename, 196 boot_info.initrd_start, 197 ram_size - initrd_offset); 198 } 199 if (initrd_size < 0) { 200 error_report("could not load initrd '%s'", 201 initrd_filename); 202 exit(EXIT_FAILURE); 203 } 204 high += initrd_size; 205 } 206 high = ROUND_UP(high, 4); 207 boot_info.initrd_end = high; 208 209 /* Device tree must be placed right after initrd (if available) */ 210 boot_info.fdt = high; 211 fdt_size = nios2_load_dtb(boot_info, ram_size, kernel_cmdline, 212 /* Preference a -dtb argument */ 213 dtb_arg ? dtb_arg : filename); 214 high += fdt_size; 215 216 /* Kernel command is at the end, 4k aligned. */ 217 boot_info.cmdline = ROUND_UP(high, 4 * KiB); 218 if (kernel_cmdline && strlen(kernel_cmdline)) { 219 pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline); 220 } 221 } 222 g_free(filename); 223 } 224