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 "sysemu/sysemu.h" 32 #include "hw/loader.h" 33 #include "elf.h" 34 35 #include "boot.h" 36 37 static struct 38 { 39 void (*machine_cpu_reset)(MicroBlazeCPU *); 40 uint32_t bootstrap_pc; 41 uint32_t cmdline; 42 uint32_t fdt; 43 } boot_info; 44 45 static void main_cpu_reset(void *opaque) 46 { 47 MicroBlazeCPU *cpu = opaque; 48 CPUMBState *env = &cpu->env; 49 50 cpu_reset(CPU(cpu)); 51 env->regs[5] = boot_info.cmdline; 52 env->regs[7] = boot_info.fdt; 53 env->sregs[SR_PC] = boot_info.bootstrap_pc; 54 if (boot_info.machine_cpu_reset) { 55 boot_info.machine_cpu_reset(cpu); 56 } 57 } 58 59 static int microblaze_load_dtb(hwaddr addr, 60 uint32_t ramsize, 61 const char *kernel_cmdline, 62 const char *dtb_filename) 63 { 64 int fdt_size; 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 return fdt_size; 85 } 86 87 static uint64_t translate_kernel_address(void *opaque, uint64_t addr) 88 { 89 return addr - 0x30000000LL; 90 } 91 92 void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base, 93 uint32_t ramsize, const char *dtb_filename, 94 void (*machine_cpu_reset)(MicroBlazeCPU *)) 95 { 96 QemuOpts *machine_opts; 97 const char *kernel_filename; 98 const char *kernel_cmdline; 99 const char *dtb_arg; 100 101 machine_opts = qemu_get_machine_opts(); 102 kernel_filename = qemu_opt_get(machine_opts, "kernel"); 103 kernel_cmdline = qemu_opt_get(machine_opts, "append"); 104 dtb_arg = qemu_opt_get(machine_opts, "dtb"); 105 if (dtb_arg) { /* Preference a -dtb argument */ 106 dtb_filename = dtb_arg; 107 } else { /* default to pcbios dtb as passed by machine_init */ 108 dtb_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename); 109 } 110 111 boot_info.machine_cpu_reset = machine_cpu_reset; 112 qemu_register_reset(main_cpu_reset, cpu); 113 114 if (kernel_filename) { 115 int kernel_size; 116 uint64_t entry, low, high; 117 uint32_t base32; 118 int big_endian = 0; 119 120 #ifdef TARGET_WORDS_BIGENDIAN 121 big_endian = 1; 122 #endif 123 124 /* Boots a kernel elf binary. */ 125 kernel_size = load_elf(kernel_filename, NULL, NULL, 126 &entry, &low, &high, 127 big_endian, ELF_MACHINE, 0); 128 base32 = entry; 129 if (base32 == 0xc0000000) { 130 kernel_size = load_elf(kernel_filename, translate_kernel_address, 131 NULL, &entry, NULL, NULL, 132 big_endian, ELF_MACHINE, 0); 133 } 134 /* Always boot into physical ram. */ 135 boot_info.bootstrap_pc = ddr_base + (entry & 0x0fffffff); 136 137 /* If it wasn't an ELF image, try an u-boot image. */ 138 if (kernel_size < 0) { 139 hwaddr uentry, loadaddr; 140 141 kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0); 142 boot_info.bootstrap_pc = uentry; 143 high = (loadaddr + kernel_size + 3) & ~3; 144 } 145 146 /* Not an ELF image nor an u-boot image, try a RAW image. */ 147 if (kernel_size < 0) { 148 kernel_size = load_image_targphys(kernel_filename, ddr_base, 149 ram_size); 150 boot_info.bootstrap_pc = ddr_base; 151 high = (ddr_base + kernel_size + 3) & ~3; 152 } 153 154 boot_info.cmdline = high + 4096; 155 if (kernel_cmdline && strlen(kernel_cmdline)) { 156 pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline); 157 } 158 /* Provide a device-tree. */ 159 boot_info.fdt = boot_info.cmdline + 4096; 160 microblaze_load_dtb(boot_info.fdt, ram_size, kernel_cmdline, 161 dtb_filename); 162 } 163 164 } 165