xref: /openbmc/qemu/hw/microblaze/boot.c (revision ded625e7)
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/datadir.h"
29 #include "cpu.h"
30 #include "qemu/option.h"
31 #include "qemu/config-file.h"
32 #include "qemu/error-report.h"
33 #include "qemu/guest-random.h"
34 #include "sysemu/device_tree.h"
35 #include "sysemu/reset.h"
36 #include "hw/boards.h"
37 #include "hw/loader.h"
38 #include "elf.h"
39 #include "qemu/cutils.h"
40 
41 #include "boot.h"
42 
43 static struct
44 {
45     void (*machine_cpu_reset)(MicroBlazeCPU *);
46     uint32_t bootstrap_pc;
47     uint32_t cmdline;
48     uint32_t initrd_start;
49     uint32_t initrd_end;
50     uint32_t fdt;
51 } boot_info;
52 
main_cpu_reset(void * opaque)53 static void main_cpu_reset(void *opaque)
54 {
55     MicroBlazeCPU *cpu = opaque;
56     CPUState *cs = CPU(cpu);
57     CPUMBState *env = &cpu->env;
58 
59     cpu_reset(cs);
60     env->regs[5] = boot_info.cmdline;
61     env->regs[6] = boot_info.initrd_start;
62     env->regs[7] = boot_info.fdt;
63     cpu_set_pc(cs, boot_info.bootstrap_pc);
64     if (boot_info.machine_cpu_reset) {
65         boot_info.machine_cpu_reset(cpu);
66     }
67 }
68 
microblaze_load_dtb(hwaddr addr,uint32_t ramsize,uint32_t initrd_start,uint32_t initrd_end,const char * kernel_cmdline,const char * dtb_filename)69 static int microblaze_load_dtb(hwaddr addr,
70                                uint32_t ramsize,
71                                uint32_t initrd_start,
72                                uint32_t initrd_end,
73                                const char *kernel_cmdline,
74                                const char *dtb_filename)
75 {
76     int fdt_size;
77     void *fdt = NULL;
78     int r;
79     uint8_t rng_seed[32];
80 
81     if (dtb_filename) {
82         fdt = load_device_tree(dtb_filename, &fdt_size);
83     }
84     if (!fdt) {
85         return 0;
86     }
87 
88     qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
89     qemu_fdt_setprop(fdt, "/chosen", "rng-seed", rng_seed, sizeof(rng_seed));
90 
91     if (kernel_cmdline) {
92         r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
93                                     kernel_cmdline);
94         if (r < 0) {
95             fprintf(stderr, "couldn't set /chosen/bootargs\n");
96         }
97     }
98 
99     if (initrd_start) {
100         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start",
101                               initrd_start);
102 
103         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end",
104                               initrd_end);
105     }
106 
107     cpu_physical_memory_write(addr, fdt, fdt_size);
108     g_free(fdt);
109     return fdt_size;
110 }
111 
translate_kernel_address(void * opaque,uint64_t addr)112 static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
113 {
114     return addr - 0x30000000LL;
115 }
116 
microblaze_load_kernel(MicroBlazeCPU * cpu,hwaddr ddr_base,uint32_t ramsize,const char * initrd_filename,const char * dtb_filename,void (* machine_cpu_reset)(MicroBlazeCPU *))117 void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base,
118                             uint32_t ramsize,
119                             const char *initrd_filename,
120                             const char *dtb_filename,
121                             void (*machine_cpu_reset)(MicroBlazeCPU *))
122 {
123     const char *kernel_filename;
124     const char *kernel_cmdline;
125     const char *dtb_arg;
126     char *filename = NULL;
127 
128     kernel_filename = current_machine->kernel_filename;
129     kernel_cmdline = current_machine->kernel_cmdline;
130     dtb_arg = current_machine->dtb;
131     /* default to pcbios dtb as passed by machine_init */
132     if (!dtb_arg && dtb_filename) {
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;
141         uint64_t entry, high;
142         uint32_t base32;
143 
144         /* Boots a kernel elf binary.  */
145         kernel_size = load_elf(kernel_filename, NULL, NULL, NULL,
146                                &entry, NULL, &high, NULL,
147                                TARGET_BIG_ENDIAN, EM_MICROBLAZE, 0, 0);
148         base32 = entry;
149         if (base32 == 0xc0000000) {
150             kernel_size = load_elf(kernel_filename, NULL,
151                                    translate_kernel_address, NULL,
152                                    &entry, NULL, NULL, NULL,
153                                    TARGET_BIG_ENDIAN, EM_MICROBLAZE, 0, 0);
154         }
155         /* Always boot into physical ram.  */
156         boot_info.bootstrap_pc = (uint32_t)entry;
157 
158         /* If it wasn't an ELF image, try an u-boot image.  */
159         if (kernel_size < 0) {
160             hwaddr uentry, loadaddr = LOAD_UIMAGE_LOADADDR_INVALID;
161 
162             kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0,
163                                       NULL, NULL);
164             boot_info.bootstrap_pc = uentry;
165             high = (loadaddr + kernel_size + 3) & ~3;
166         }
167 
168         /* Not an ELF image nor an u-boot image, try a RAW image.  */
169         if (kernel_size < 0) {
170             kernel_size = load_image_targphys(kernel_filename, ddr_base,
171                                               ramsize);
172             boot_info.bootstrap_pc = ddr_base;
173             high = (ddr_base + kernel_size + 3) & ~3;
174         }
175 
176         if (initrd_filename) {
177             int initrd_size;
178             uint32_t initrd_offset;
179 
180             high = ROUND_UP(high + kernel_size, 4);
181             boot_info.initrd_start = high;
182             initrd_offset = boot_info.initrd_start - ddr_base;
183 
184             initrd_size = load_ramdisk(initrd_filename,
185                                        boot_info.initrd_start,
186                                        ramsize - initrd_offset);
187             if (initrd_size < 0) {
188                 initrd_size = load_image_targphys(initrd_filename,
189                                                   boot_info.initrd_start,
190                                                   ramsize - initrd_offset);
191             }
192             if (initrd_size < 0) {
193                 error_report("could not load initrd '%s'",
194                              initrd_filename);
195                 exit(EXIT_FAILURE);
196             }
197             boot_info.initrd_end = boot_info.initrd_start + initrd_size;
198             high = ROUND_UP(high + initrd_size, 4);
199         }
200 
201         boot_info.cmdline = high + 4096;
202         if (kernel_cmdline && strlen(kernel_cmdline)) {
203             pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
204         }
205         /* Provide a device-tree.  */
206         boot_info.fdt = boot_info.cmdline + 4096;
207         microblaze_load_dtb(boot_info.fdt, ramsize,
208                             boot_info.initrd_start,
209                             boot_info.initrd_end,
210                             kernel_cmdline,
211                             /* Preference a -dtb argument */
212                             dtb_arg ? dtb_arg : filename);
213     }
214     g_free(filename);
215 }
216