1 | /* |
2 | * Nios2 kernel loader |
3 | * |
4 | * Copyright (c) 2016 Marek Vasut <marek.vasut@gmail.com> |
5 | * |
6 | * Based on microblaze kernel loader |
7 | * |
8 | * Copyright (c) 2012 Peter Crosthwaite <peter.crosthwaite@petalogix.com> |
9 | * Copyright (c) 2012 PetaLogix |
10 | * Copyright (c) 2009 Edgar E. Iglesias. |
11 | * |
12 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
13 | * of this software and associated documentation files (the "Software"), to deal |
14 | * in the Software without restriction, including without limitation the rights |
15 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
16 | * copies of the Software, and to permit persons to whom the Software is |
17 | * furnished to do so, subject to the following conditions: |
18 | * |
19 | * The above copyright notice and this permission notice shall be included in |
20 | * all copies or substantial portions of the Software. |
21 | * |
22 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
23 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
24 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
25 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
26 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
27 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
28 | * THE SOFTWARE. |
29 | */ |
30 | |
31 | #include "qemu/osdep.h" |
32 | #include "qemu/units.h" |
33 | #include "qemu-common.h" |
34 | #include "cpu.h" |
35 | #include "qemu/option.h" |
36 | #include "qemu/config-file.h" |
37 | #include "qemu/error-report.h" |
38 | #include "sysemu/device_tree.h" |
39 | #include "sysemu/reset.h" |
40 | #include "sysemu/sysemu.h" |
41 | #include "hw/loader.h" |
42 | #include "elf.h" |
43 | |
44 | #include "boot.h" |
45 | |
46 | #define NIOS2_MAGIC 0x534f494e |
47 | |
48 | static struct nios2_boot_info { |
49 | void (*machine_cpu_reset)(Nios2CPU *); |
50 | uint32_t bootstrap_pc; |
51 | uint32_t cmdline; |
52 | uint32_t initrd_start; |
53 | uint32_t initrd_end; |
54 | uint32_t fdt; |
55 | } boot_info; |
56 | |
57 | static void main_cpu_reset(void *opaque) |
58 | { |
59 | Nios2CPU *cpu = opaque; |
60 | CPUState *cs = CPU(cpu); |
61 | CPUNios2State *env = &cpu->env; |
62 | |
63 | cpu_reset(CPU(cpu)); |
64 | |
65 | env->regs[R_ARG0] = NIOS2_MAGIC; |
66 | env->regs[R_ARG1] = boot_info.initrd_start; |
67 | env->regs[R_ARG2] = boot_info.fdt; |
68 | env->regs[R_ARG3] = boot_info.cmdline; |
69 | |
70 | cpu_set_pc(cs, boot_info.bootstrap_pc); |
71 | if (boot_info.machine_cpu_reset) { |
72 | boot_info.machine_cpu_reset(cpu); |
73 | } |
74 | } |
75 | |
76 | static uint64_t translate_kernel_address(void *opaque, uint64_t addr) |
77 | { |
78 | return addr - 0xc0000000LL; |
79 | } |
80 | |
81 | static int nios2_load_dtb(struct nios2_boot_info bi, const uint32_t ramsize, |
82 | const char *kernel_cmdline, const char *dtb_filename) |
83 | { |
84 | int fdt_size; |
85 | void *fdt = NULL; |
86 | int r; |
87 | |
88 | if (dtb_filename) { |
89 | fdt = load_device_tree(dtb_filename, &fdt_size); |
90 | } |
91 | if (!fdt) { |
92 | return 0; |
93 | } |
94 | |
95 | if (kernel_cmdline) { |
96 | r = qemu_fdt_setprop_string(fdt, "/chosen" , "bootargs" , |
97 | kernel_cmdline); |
98 | if (r < 0) { |
99 | fprintf(stderr, "couldn't set /chosen/bootargs\n" ); |
100 | } |
101 | } |
102 | |
103 | if (bi.initrd_start) { |
104 | qemu_fdt_setprop_cell(fdt, "/chosen" , "linux,initrd-start" , |
105 | translate_kernel_address(NULL, bi.initrd_start)); |
106 | |
107 | qemu_fdt_setprop_cell(fdt, "/chosen" , "linux,initrd-end" , |
108 | translate_kernel_address(NULL, bi.initrd_end)); |
109 | } |
110 | |
111 | cpu_physical_memory_write(bi.fdt, fdt, fdt_size); |
112 | return fdt_size; |
113 | } |
114 | |
115 | void nios2_load_kernel(Nios2CPU *cpu, hwaddr ddr_base, |
116 | uint32_t ramsize, |
117 | const char *initrd_filename, |
118 | const char *dtb_filename, |
119 | void (*machine_cpu_reset)(Nios2CPU *)) |
120 | { |
121 | QemuOpts *machine_opts; |
122 | const char *kernel_filename; |
123 | const char *kernel_cmdline; |
124 | const char *dtb_arg; |
125 | char *filename = NULL; |
126 | |
127 | machine_opts = qemu_get_machine_opts(); |
128 | kernel_filename = qemu_opt_get(machine_opts, "kernel" ); |
129 | kernel_cmdline = qemu_opt_get(machine_opts, "append" ); |
130 | dtb_arg = qemu_opt_get(machine_opts, "dtb" ); |
131 | /* default to pcbios dtb as passed by machine_init */ |
132 | if (!dtb_arg) { |
133 | filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename); |
134 | } |
135 | |
136 | boot_info.machine_cpu_reset = machine_cpu_reset; |
137 | qemu_register_reset(main_cpu_reset, cpu); |
138 | |
139 | if (kernel_filename) { |
140 | int kernel_size, fdt_size; |
141 | uint64_t entry, low, high; |
142 | int big_endian = 0; |
143 | |
144 | #ifdef TARGET_WORDS_BIGENDIAN |
145 | big_endian = 1; |
146 | #endif |
147 | |
148 | /* Boots a kernel elf binary. */ |
149 | kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, |
150 | &entry, &low, &high, |
151 | big_endian, EM_ALTERA_NIOS2, 0, 0); |
152 | if ((uint32_t)entry == 0xc0000000) { |
153 | /* |
154 | * The Nios II processor reference guide documents that the |
155 | * kernel is placed at virtual memory address 0xc0000000, |
156 | * and we've got something that points there. Reload it |
157 | * and adjust the entry to get the address in physical RAM. |
158 | */ |
159 | kernel_size = load_elf(kernel_filename, NULL, |
160 | translate_kernel_address, NULL, |
161 | &entry, NULL, NULL, |
162 | big_endian, EM_ALTERA_NIOS2, 0, 0); |
163 | boot_info.bootstrap_pc = ddr_base + 0xc0000000 + |
164 | (entry & 0x07ffffff); |
165 | } else { |
166 | /* Use the entry point in the ELF image. */ |
167 | boot_info.bootstrap_pc = (uint32_t)entry; |
168 | } |
169 | |
170 | /* If it wasn't an ELF image, try an u-boot image. */ |
171 | if (kernel_size < 0) { |
172 | hwaddr uentry, loadaddr = LOAD_UIMAGE_LOADADDR_INVALID; |
173 | |
174 | kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0, |
175 | NULL, NULL); |
176 | boot_info.bootstrap_pc = uentry; |
177 | high = loadaddr + kernel_size; |
178 | } |
179 | |
180 | /* Not an ELF image nor an u-boot image, try a RAW image. */ |
181 | if (kernel_size < 0) { |
182 | kernel_size = load_image_targphys(kernel_filename, ddr_base, |
183 | ram_size); |
184 | boot_info.bootstrap_pc = ddr_base; |
185 | high = ddr_base + kernel_size; |
186 | } |
187 | |
188 | high = ROUND_UP(high, 1 * MiB); |
189 | |
190 | /* If initrd is available, it goes after the kernel, aligned to 1M. */ |
191 | if (initrd_filename) { |
192 | int initrd_size; |
193 | uint32_t initrd_offset; |
194 | |
195 | boot_info.initrd_start = high; |
196 | initrd_offset = boot_info.initrd_start - ddr_base; |
197 | |
198 | initrd_size = load_ramdisk(initrd_filename, |
199 | boot_info.initrd_start, |
200 | ram_size - initrd_offset); |
201 | if (initrd_size < 0) { |
202 | initrd_size = load_image_targphys(initrd_filename, |
203 | boot_info.initrd_start, |
204 | ram_size - initrd_offset); |
205 | } |
206 | if (initrd_size < 0) { |
207 | error_report("could not load initrd '%s'" , |
208 | initrd_filename); |
209 | exit(EXIT_FAILURE); |
210 | } |
211 | high += initrd_size; |
212 | } |
213 | high = ROUND_UP(high, 4); |
214 | boot_info.initrd_end = high; |
215 | |
216 | /* Device tree must be placed right after initrd (if available) */ |
217 | boot_info.fdt = high; |
218 | fdt_size = nios2_load_dtb(boot_info, ram_size, kernel_cmdline, |
219 | /* Preference a -dtb argument */ |
220 | dtb_arg ? dtb_arg : filename); |
221 | high += fdt_size; |
222 | |
223 | /* Kernel command is at the end, 4k aligned. */ |
224 | boot_info.cmdline = ROUND_UP(high, 4 * KiB); |
225 | if (kernel_cmdline && strlen(kernel_cmdline)) { |
226 | pstrcpy_targphys("cmdline" , boot_info.cmdline, 256, kernel_cmdline); |
227 | } |
228 | } |
229 | g_free(filename); |
230 | } |
231 | |