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-common.h" 29 #include "qemu/datadir.h" 30 #include "cpu.h" 31 #include "qemu/option.h" 32 #include "qemu/config-file.h" 33 #include "qemu/error-report.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 80 if (dtb_filename) { 81 fdt = load_device_tree(dtb_filename, &fdt_size); 82 } 83 if (!fdt) { 84 return 0; 85 } 86 87 if (kernel_cmdline) { 88 r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", 89 kernel_cmdline); 90 if (r < 0) { 91 fprintf(stderr, "couldn't set /chosen/bootargs\n"); 92 } 93 } 94 95 if (initrd_start) { 96 qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start", 97 initrd_start); 98 99 qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end", 100 initrd_end); 101 } 102 103 cpu_physical_memory_write(addr, fdt, fdt_size); 104 g_free(fdt); 105 return fdt_size; 106 } 107 108 static uint64_t translate_kernel_address(void *opaque, uint64_t addr) 109 { 110 return addr - 0x30000000LL; 111 } 112 113 void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base, 114 uint32_t ramsize, 115 const char *initrd_filename, 116 const char *dtb_filename, 117 void (*machine_cpu_reset)(MicroBlazeCPU *)) 118 { 119 const char *kernel_filename; 120 const char *kernel_cmdline; 121 const char *dtb_arg; 122 char *filename = NULL; 123 124 kernel_filename = current_machine->kernel_filename; 125 kernel_cmdline = current_machine->kernel_cmdline; 126 dtb_arg = current_machine->dtb; 127 /* default to pcbios dtb as passed by machine_init */ 128 if (!dtb_arg && dtb_filename) { 129 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename); 130 } 131 132 boot_info.machine_cpu_reset = machine_cpu_reset; 133 qemu_register_reset(main_cpu_reset, cpu); 134 135 if (kernel_filename) { 136 int kernel_size; 137 uint64_t entry, high; 138 uint32_t base32; 139 int big_endian = 0; 140 141 #ifdef TARGET_WORDS_BIGENDIAN 142 big_endian = 1; 143 #endif 144 145 /* Boots a kernel elf binary. */ 146 kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, 147 &entry, NULL, &high, NULL, 148 big_endian, EM_MICROBLAZE, 0, 0); 149 base32 = entry; 150 if (base32 == 0xc0000000) { 151 kernel_size = load_elf(kernel_filename, NULL, 152 translate_kernel_address, NULL, 153 &entry, NULL, NULL, NULL, 154 big_endian, EM_MICROBLAZE, 0, 0); 155 } 156 /* Always boot into physical ram. */ 157 boot_info.bootstrap_pc = (uint32_t)entry; 158 159 /* If it wasn't an ELF image, try an u-boot image. */ 160 if (kernel_size < 0) { 161 hwaddr uentry, loadaddr = LOAD_UIMAGE_LOADADDR_INVALID; 162 163 kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0, 164 NULL, NULL); 165 boot_info.bootstrap_pc = uentry; 166 high = (loadaddr + kernel_size + 3) & ~3; 167 } 168 169 /* Not an ELF image nor an u-boot image, try a RAW image. */ 170 if (kernel_size < 0) { 171 kernel_size = load_image_targphys(kernel_filename, ddr_base, 172 ramsize); 173 boot_info.bootstrap_pc = ddr_base; 174 high = (ddr_base + kernel_size + 3) & ~3; 175 } 176 177 if (initrd_filename) { 178 int initrd_size; 179 uint32_t initrd_offset; 180 181 high = ROUND_UP(high + kernel_size, 4); 182 boot_info.initrd_start = high; 183 initrd_offset = boot_info.initrd_start - ddr_base; 184 185 initrd_size = load_ramdisk(initrd_filename, 186 boot_info.initrd_start, 187 ramsize - initrd_offset); 188 if (initrd_size < 0) { 189 initrd_size = load_image_targphys(initrd_filename, 190 boot_info.initrd_start, 191 ramsize - initrd_offset); 192 } 193 if (initrd_size < 0) { 194 error_report("could not load initrd '%s'", 195 initrd_filename); 196 exit(EXIT_FAILURE); 197 } 198 boot_info.initrd_end = boot_info.initrd_start + initrd_size; 199 high = ROUND_UP(high + initrd_size, 4); 200 } 201 202 boot_info.cmdline = high + 4096; 203 if (kernel_cmdline && strlen(kernel_cmdline)) { 204 pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline); 205 } 206 /* Provide a device-tree. */ 207 boot_info.fdt = boot_info.cmdline + 4096; 208 microblaze_load_dtb(boot_info.fdt, ramsize, 209 boot_info.initrd_start, 210 boot_info.initrd_end, 211 kernel_cmdline, 212 /* Preference a -dtb argument */ 213 dtb_arg ? dtb_arg : filename); 214 } 215 g_free(filename); 216 } 217