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 "cpu.h" 30 #include "qemu/option.h" 31 #include "qemu/config-file.h" 32 #include "qemu/error-report.h" 33 #include "sysemu/device_tree.h" 34 #include "sysemu/reset.h" 35 #include "sysemu/sysemu.h" 36 #include "hw/loader.h" 37 #include "elf.h" 38 #include "qemu/cutils.h" 39 40 #include "boot.h" 41 42 static struct 43 { 44 void (*machine_cpu_reset)(MicroBlazeCPU *); 45 uint32_t bootstrap_pc; 46 uint32_t cmdline; 47 uint32_t initrd_start; 48 uint32_t initrd_end; 49 uint32_t fdt; 50 } boot_info; 51 52 static void main_cpu_reset(void *opaque) 53 { 54 MicroBlazeCPU *cpu = opaque; 55 CPUState *cs = CPU(cpu); 56 CPUMBState *env = &cpu->env; 57 58 cpu_reset(cs); 59 env->regs[5] = boot_info.cmdline; 60 env->regs[6] = boot_info.initrd_start; 61 env->regs[7] = boot_info.fdt; 62 cpu_set_pc(cs, boot_info.bootstrap_pc); 63 if (boot_info.machine_cpu_reset) { 64 boot_info.machine_cpu_reset(cpu); 65 } 66 } 67 68 static int microblaze_load_dtb(hwaddr addr, 69 uint32_t ramsize, 70 uint32_t initrd_start, 71 uint32_t initrd_end, 72 const char *kernel_cmdline, 73 const char *dtb_filename) 74 { 75 int fdt_size; 76 void *fdt = NULL; 77 int r; 78 79 if (dtb_filename) { 80 fdt = load_device_tree(dtb_filename, &fdt_size); 81 } 82 if (!fdt) { 83 return 0; 84 } 85 86 if (kernel_cmdline) { 87 r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", 88 kernel_cmdline); 89 if (r < 0) { 90 fprintf(stderr, "couldn't set /chosen/bootargs\n"); 91 } 92 } 93 94 if (initrd_start) { 95 qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start", 96 initrd_start); 97 98 qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end", 99 initrd_end); 100 } 101 102 cpu_physical_memory_write(addr, fdt, fdt_size); 103 g_free(fdt); 104 return fdt_size; 105 } 106 107 static uint64_t translate_kernel_address(void *opaque, uint64_t addr) 108 { 109 return addr - 0x30000000LL; 110 } 111 112 void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base, 113 uint32_t ramsize, 114 const char *initrd_filename, 115 const char *dtb_filename, 116 void (*machine_cpu_reset)(MicroBlazeCPU *)) 117 { 118 QemuOpts *machine_opts; 119 const char *kernel_filename; 120 const char *kernel_cmdline; 121 const char *dtb_arg; 122 char *filename = NULL; 123 124 machine_opts = qemu_get_machine_opts(); 125 kernel_filename = qemu_opt_get(machine_opts, "kernel"); 126 kernel_cmdline = qemu_opt_get(machine_opts, "append"); 127 dtb_arg = qemu_opt_get(machine_opts, "dtb"); 128 /* default to pcbios dtb as passed by machine_init */ 129 if (!dtb_arg && dtb_filename) { 130 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename); 131 } 132 133 boot_info.machine_cpu_reset = machine_cpu_reset; 134 qemu_register_reset(main_cpu_reset, cpu); 135 136 if (kernel_filename) { 137 int kernel_size; 138 uint64_t entry, low, high; 139 uint32_t base32; 140 int big_endian = 0; 141 142 #ifdef TARGET_WORDS_BIGENDIAN 143 big_endian = 1; 144 #endif 145 146 /* Boots a kernel elf binary. */ 147 kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, 148 &entry, &low, &high, NULL, 149 big_endian, EM_MICROBLAZE, 0, 0); 150 base32 = entry; 151 if (base32 == 0xc0000000) { 152 kernel_size = load_elf(kernel_filename, NULL, 153 translate_kernel_address, NULL, 154 &entry, NULL, NULL, NULL, 155 big_endian, EM_MICROBLAZE, 0, 0); 156 } 157 /* Always boot into physical ram. */ 158 boot_info.bootstrap_pc = (uint32_t)entry; 159 160 /* If it wasn't an ELF image, try an u-boot image. */ 161 if (kernel_size < 0) { 162 hwaddr uentry, loadaddr = LOAD_UIMAGE_LOADADDR_INVALID; 163 164 kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0, 165 NULL, NULL); 166 boot_info.bootstrap_pc = uentry; 167 high = (loadaddr + kernel_size + 3) & ~3; 168 } 169 170 /* Not an ELF image nor an u-boot image, try a RAW image. */ 171 if (kernel_size < 0) { 172 kernel_size = load_image_targphys(kernel_filename, ddr_base, 173 ram_size); 174 boot_info.bootstrap_pc = ddr_base; 175 high = (ddr_base + kernel_size + 3) & ~3; 176 } 177 178 if (initrd_filename) { 179 int initrd_size; 180 uint32_t initrd_offset; 181 182 high = ROUND_UP(high + kernel_size, 4); 183 boot_info.initrd_start = high; 184 initrd_offset = boot_info.initrd_start - ddr_base; 185 186 initrd_size = load_ramdisk(initrd_filename, 187 boot_info.initrd_start, 188 ram_size - initrd_offset); 189 if (initrd_size < 0) { 190 initrd_size = load_image_targphys(initrd_filename, 191 boot_info.initrd_start, 192 ram_size - initrd_offset); 193 } 194 if (initrd_size < 0) { 195 error_report("could not load initrd '%s'", 196 initrd_filename); 197 exit(EXIT_FAILURE); 198 } 199 boot_info.initrd_end = boot_info.initrd_start + initrd_size; 200 high = ROUND_UP(high + initrd_size, 4); 201 } 202 203 boot_info.cmdline = high + 4096; 204 if (kernel_cmdline && strlen(kernel_cmdline)) { 205 pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline); 206 } 207 /* Provide a device-tree. */ 208 boot_info.fdt = boot_info.cmdline + 4096; 209 microblaze_load_dtb(boot_info.fdt, ram_size, 210 boot_info.initrd_start, 211 boot_info.initrd_end, 212 kernel_cmdline, 213 /* Preference a -dtb argument */ 214 dtb_arg ? dtb_arg : filename); 215 } 216 g_free(filename); 217 } 218