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/option.h" 28 #include "qemu/config-file.h" 29 #include "qemu/error-report.h" 30 #include "qemu-common.h" 31 #include "sysemu/device_tree.h" 32 #include "sysemu/sysemu.h" 33 #include "hw/loader.h" 34 #include "elf.h" 35 36 #include "boot.h" 37 38 static struct 39 { 40 void (*machine_cpu_reset)(MicroBlazeCPU *); 41 uint32_t bootstrap_pc; 42 uint32_t cmdline; 43 uint32_t initrd_start; 44 uint32_t initrd_end; 45 uint32_t fdt; 46 } boot_info; 47 48 static void main_cpu_reset(void *opaque) 49 { 50 MicroBlazeCPU *cpu = opaque; 51 CPUState *cs = CPU(cpu); 52 CPUMBState *env = &cpu->env; 53 54 cpu_reset(cs); 55 env->regs[5] = boot_info.cmdline; 56 env->regs[6] = boot_info.initrd_start; 57 env->regs[7] = boot_info.fdt; 58 cpu_set_pc(cs, boot_info.bootstrap_pc); 59 if (boot_info.machine_cpu_reset) { 60 boot_info.machine_cpu_reset(cpu); 61 } 62 } 63 64 static int microblaze_load_dtb(hwaddr addr, 65 uint32_t ramsize, 66 uint32_t initrd_start, 67 uint32_t initrd_end, 68 const char *kernel_cmdline, 69 const char *dtb_filename) 70 { 71 int fdt_size; 72 void *fdt = NULL; 73 int r; 74 75 if (dtb_filename) { 76 fdt = load_device_tree(dtb_filename, &fdt_size); 77 } 78 if (!fdt) { 79 return 0; 80 } 81 82 if (kernel_cmdline) { 83 r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", 84 kernel_cmdline); 85 if (r < 0) { 86 fprintf(stderr, "couldn't set /chosen/bootargs\n"); 87 } 88 } 89 90 if (initrd_start) { 91 qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start", 92 initrd_start); 93 94 qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end", 95 initrd_end); 96 } 97 98 cpu_physical_memory_write(addr, fdt, fdt_size); 99 return fdt_size; 100 } 101 102 static uint64_t translate_kernel_address(void *opaque, uint64_t addr) 103 { 104 return addr - 0x30000000LL; 105 } 106 107 void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base, 108 uint32_t ramsize, 109 const char *initrd_filename, 110 const char *dtb_filename, 111 void (*machine_cpu_reset)(MicroBlazeCPU *)) 112 { 113 QemuOpts *machine_opts; 114 const char *kernel_filename; 115 const char *kernel_cmdline; 116 const char *dtb_arg; 117 char *filename = NULL; 118 119 machine_opts = qemu_get_machine_opts(); 120 kernel_filename = qemu_opt_get(machine_opts, "kernel"); 121 kernel_cmdline = qemu_opt_get(machine_opts, "append"); 122 dtb_arg = qemu_opt_get(machine_opts, "dtb"); 123 /* default to pcbios dtb as passed by machine_init */ 124 if (!dtb_arg) { 125 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename); 126 } 127 128 boot_info.machine_cpu_reset = machine_cpu_reset; 129 qemu_register_reset(main_cpu_reset, cpu); 130 131 if (kernel_filename) { 132 int kernel_size; 133 uint64_t entry, low, high; 134 uint32_t base32; 135 int big_endian = 0; 136 137 #ifdef TARGET_WORDS_BIGENDIAN 138 big_endian = 1; 139 #endif 140 141 /* Boots a kernel elf binary. */ 142 kernel_size = load_elf(kernel_filename, NULL, NULL, 143 &entry, &low, &high, 144 big_endian, ELF_MACHINE, 0); 145 base32 = entry; 146 if (base32 == 0xc0000000) { 147 kernel_size = load_elf(kernel_filename, translate_kernel_address, 148 NULL, &entry, NULL, NULL, 149 big_endian, ELF_MACHINE, 0); 150 } 151 /* Always boot into physical ram. */ 152 boot_info.bootstrap_pc = (uint32_t)entry; 153 154 /* If it wasn't an ELF image, try an u-boot image. */ 155 if (kernel_size < 0) { 156 hwaddr uentry, loadaddr; 157 158 kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0, 159 NULL, NULL); 160 boot_info.bootstrap_pc = uentry; 161 high = (loadaddr + kernel_size + 3) & ~3; 162 } 163 164 /* Not an ELF image nor an u-boot image, try a RAW image. */ 165 if (kernel_size < 0) { 166 kernel_size = load_image_targphys(kernel_filename, ddr_base, 167 ram_size); 168 boot_info.bootstrap_pc = ddr_base; 169 high = (ddr_base + kernel_size + 3) & ~3; 170 } 171 172 if (initrd_filename) { 173 int initrd_size; 174 uint32_t initrd_offset; 175 176 high = ROUND_UP(high + kernel_size, 4); 177 boot_info.initrd_start = high; 178 initrd_offset = boot_info.initrd_start - ddr_base; 179 180 initrd_size = load_ramdisk(initrd_filename, 181 boot_info.initrd_start, 182 ram_size - initrd_offset); 183 if (initrd_size < 0) { 184 initrd_size = load_image_targphys(initrd_filename, 185 boot_info.initrd_start, 186 ram_size - initrd_offset); 187 } 188 if (initrd_size < 0) { 189 error_report("qemu: could not load initrd '%s'", 190 initrd_filename); 191 exit(EXIT_FAILURE); 192 } 193 boot_info.initrd_end = boot_info.initrd_start + initrd_size; 194 high = ROUND_UP(high + initrd_size, 4); 195 } 196 197 boot_info.cmdline = high + 4096; 198 if (kernel_cmdline && strlen(kernel_cmdline)) { 199 pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline); 200 } 201 /* Provide a device-tree. */ 202 boot_info.fdt = boot_info.cmdline + 4096; 203 microblaze_load_dtb(boot_info.fdt, ram_size, 204 boot_info.initrd_start, 205 boot_info.initrd_end, 206 kernel_cmdline, 207 /* Preference a -dtb argument */ 208 dtb_arg ? dtb_arg : filename); 209 } 210 g_free(filename); 211 } 212