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-common.h" 30 #include "sysemu/device_tree.h" 31 #include "hw/loader.h" 32 #include "elf.h" 33 34 #include "boot.h" 35 36 static struct 37 { 38 void (*machine_cpu_reset)(MicroBlazeCPU *); 39 uint32_t bootstrap_pc; 40 uint32_t cmdline; 41 uint32_t fdt; 42 } boot_info; 43 44 static void main_cpu_reset(void *opaque) 45 { 46 MicroBlazeCPU *cpu = opaque; 47 CPUMBState *env = &cpu->env; 48 49 cpu_reset(CPU(cpu)); 50 env->regs[5] = boot_info.cmdline; 51 env->regs[7] = boot_info.fdt; 52 env->sregs[SR_PC] = boot_info.bootstrap_pc; 53 if (boot_info.machine_cpu_reset) { 54 boot_info.machine_cpu_reset(cpu); 55 } 56 } 57 58 static int microblaze_load_dtb(hwaddr addr, 59 uint32_t ramsize, 60 const char *kernel_cmdline, 61 const char *dtb_filename) 62 { 63 int fdt_size; 64 #ifdef CONFIG_FDT 65 void *fdt = NULL; 66 int r; 67 68 if (dtb_filename) { 69 fdt = load_device_tree(dtb_filename, &fdt_size); 70 } 71 if (!fdt) { 72 return 0; 73 } 74 75 if (kernel_cmdline) { 76 r = qemu_devtree_setprop_string(fdt, "/chosen", "bootargs", 77 kernel_cmdline); 78 if (r < 0) { 79 fprintf(stderr, "couldn't set /chosen/bootargs\n"); 80 } 81 } 82 83 cpu_physical_memory_write(addr, fdt, fdt_size); 84 #else 85 /* We lack libfdt so we cannot manipulate the fdt. Just pass on the blob 86 to the kernel. */ 87 if (dtb_filename) { 88 fdt_size = load_image_targphys(dtb_filename, addr, 0x10000); 89 } 90 if (kernel_cmdline) { 91 fprintf(stderr, 92 "Warning: missing libfdt, cannot pass cmdline to kernel!\n"); 93 } 94 #endif 95 return fdt_size; 96 } 97 98 static uint64_t translate_kernel_address(void *opaque, uint64_t addr) 99 { 100 return addr - 0x30000000LL; 101 } 102 103 void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base, 104 uint32_t ramsize, const char *dtb_filename, 105 void (*machine_cpu_reset)(MicroBlazeCPU *)) 106 { 107 QemuOpts *machine_opts; 108 const char *kernel_filename = NULL; 109 const char *kernel_cmdline = NULL; 110 111 machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0); 112 if (machine_opts) { 113 const char *dtb_arg; 114 kernel_filename = qemu_opt_get(machine_opts, "kernel"); 115 kernel_cmdline = qemu_opt_get(machine_opts, "append"); 116 dtb_arg = qemu_opt_get(machine_opts, "dtb"); 117 if (dtb_arg) { /* Preference a -dtb argument */ 118 dtb_filename = dtb_arg; 119 } else { /* default to pcbios dtb as passed by machine_init */ 120 dtb_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename); 121 } 122 } 123 124 boot_info.machine_cpu_reset = machine_cpu_reset; 125 qemu_register_reset(main_cpu_reset, cpu); 126 127 if (kernel_filename) { 128 int kernel_size; 129 uint64_t entry, low, high; 130 uint32_t base32; 131 int big_endian = 0; 132 133 #ifdef TARGET_WORDS_BIGENDIAN 134 big_endian = 1; 135 #endif 136 137 /* Boots a kernel elf binary. */ 138 kernel_size = load_elf(kernel_filename, NULL, NULL, 139 &entry, &low, &high, 140 big_endian, ELF_MACHINE, 0); 141 base32 = entry; 142 if (base32 == 0xc0000000) { 143 kernel_size = load_elf(kernel_filename, translate_kernel_address, 144 NULL, &entry, NULL, NULL, 145 big_endian, ELF_MACHINE, 0); 146 } 147 /* Always boot into physical ram. */ 148 boot_info.bootstrap_pc = ddr_base + (entry & 0x0fffffff); 149 150 /* If it wasn't an ELF image, try an u-boot image. */ 151 if (kernel_size < 0) { 152 hwaddr uentry, loadaddr; 153 154 kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0); 155 boot_info.bootstrap_pc = uentry; 156 high = (loadaddr + kernel_size + 3) & ~3; 157 } 158 159 /* Not an ELF image nor an u-boot image, try a RAW image. */ 160 if (kernel_size < 0) { 161 kernel_size = load_image_targphys(kernel_filename, ddr_base, 162 ram_size); 163 boot_info.bootstrap_pc = ddr_base; 164 high = (ddr_base + kernel_size + 3) & ~3; 165 } 166 167 boot_info.cmdline = high + 4096; 168 if (kernel_cmdline && strlen(kernel_cmdline)) { 169 pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline); 170 } 171 /* Provide a device-tree. */ 172 boot_info.fdt = boot_info.cmdline + 4096; 173 microblaze_load_dtb(boot_info.fdt, ram_size, kernel_cmdline, 174 dtb_filename); 175 } 176 177 } 178