xref: /openbmc/qemu/hw/microblaze/boot.c (revision acb0ef58)
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     CPUMBState *env = &cpu->env;
52 
53     cpu_reset(CPU(cpu));
54     env->regs[5] = boot_info.cmdline;
55     env->regs[6] = boot_info.initrd_start;
56     env->regs[7] = boot_info.fdt;
57     env->sregs[SR_PC] = boot_info.bootstrap_pc;
58     if (boot_info.machine_cpu_reset) {
59         boot_info.machine_cpu_reset(cpu);
60     }
61 }
62 
63 static int microblaze_load_dtb(hwaddr addr,
64                                uint32_t ramsize,
65                                uint32_t initrd_start,
66                                uint32_t initrd_end,
67                                const char *kernel_cmdline,
68                                const char *dtb_filename)
69 {
70     int fdt_size;
71     void *fdt = NULL;
72     int r;
73 
74     if (dtb_filename) {
75         fdt = load_device_tree(dtb_filename, &fdt_size);
76     }
77     if (!fdt) {
78         return 0;
79     }
80 
81     if (kernel_cmdline) {
82         r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
83                                     kernel_cmdline);
84         if (r < 0) {
85             fprintf(stderr, "couldn't set /chosen/bootargs\n");
86         }
87     }
88 
89     if (initrd_start) {
90         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start",
91                               initrd_start);
92 
93         qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end",
94                               initrd_end);
95     }
96 
97     cpu_physical_memory_write(addr, fdt, fdt_size);
98     return fdt_size;
99 }
100 
101 static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
102 {
103     return addr - 0x30000000LL;
104 }
105 
106 void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base,
107                             uint32_t ramsize,
108                             const char *initrd_filename,
109                             const char *dtb_filename,
110                             void (*machine_cpu_reset)(MicroBlazeCPU *))
111 {
112     QemuOpts *machine_opts;
113     const char *kernel_filename;
114     const char *kernel_cmdline;
115     const char *dtb_arg;
116 
117     machine_opts = qemu_get_machine_opts();
118     kernel_filename = qemu_opt_get(machine_opts, "kernel");
119     kernel_cmdline = qemu_opt_get(machine_opts, "append");
120     dtb_arg = qemu_opt_get(machine_opts, "dtb");
121     if (dtb_arg) { /* Preference a -dtb argument */
122         dtb_filename = dtb_arg;
123     } else { /* default to pcbios dtb as passed by machine_init */
124         dtb_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename);
125     }
126 
127     boot_info.machine_cpu_reset = machine_cpu_reset;
128     qemu_register_reset(main_cpu_reset, cpu);
129 
130     if (kernel_filename) {
131         int kernel_size;
132         uint64_t entry, low, high;
133         uint32_t base32;
134         int big_endian = 0;
135 
136 #ifdef TARGET_WORDS_BIGENDIAN
137         big_endian = 1;
138 #endif
139 
140         /* Boots a kernel elf binary.  */
141         kernel_size = load_elf(kernel_filename, NULL, NULL,
142                                &entry, &low, &high,
143                                big_endian, ELF_MACHINE, 0);
144         base32 = entry;
145         if (base32 == 0xc0000000) {
146             kernel_size = load_elf(kernel_filename, translate_kernel_address,
147                                    NULL, &entry, NULL, NULL,
148                                    big_endian, ELF_MACHINE, 0);
149         }
150         /* Always boot into physical ram.  */
151         boot_info.bootstrap_pc = (uint32_t)entry;
152 
153         /* If it wasn't an ELF image, try an u-boot image.  */
154         if (kernel_size < 0) {
155             hwaddr uentry, loadaddr;
156 
157             kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0);
158             boot_info.bootstrap_pc = uentry;
159             high = (loadaddr + kernel_size + 3) & ~3;
160         }
161 
162         /* Not an ELF image nor an u-boot image, try a RAW image.  */
163         if (kernel_size < 0) {
164             kernel_size = load_image_targphys(kernel_filename, ddr_base,
165                                               ram_size);
166             boot_info.bootstrap_pc = ddr_base;
167             high = (ddr_base + kernel_size + 3) & ~3;
168         }
169 
170         if (initrd_filename) {
171             int initrd_size;
172             uint32_t initrd_offset;
173 
174             high = ROUND_UP(high + kernel_size, 4);
175             boot_info.initrd_start = high;
176             initrd_offset = boot_info.initrd_start - ddr_base;
177 
178             initrd_size = load_ramdisk(initrd_filename,
179                                        boot_info.initrd_start,
180                                        ram_size - initrd_offset);
181             if (initrd_size < 0) {
182                 initrd_size = load_image_targphys(initrd_filename,
183                                                   boot_info.initrd_start,
184                                                   ram_size - initrd_offset);
185             }
186             if (initrd_size < 0) {
187                 error_report("qemu: could not load initrd '%s'\n",
188                              initrd_filename);
189                 exit(EXIT_FAILURE);
190             }
191             boot_info.initrd_end = boot_info.initrd_start + initrd_size;
192             high = ROUND_UP(high + initrd_size, 4);
193         }
194 
195         boot_info.cmdline = high + 4096;
196         if (kernel_cmdline && strlen(kernel_cmdline)) {
197             pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
198         }
199         /* Provide a device-tree.  */
200         boot_info.fdt = boot_info.cmdline + 4096;
201         microblaze_load_dtb(boot_info.fdt, ram_size,
202                             boot_info.initrd_start,
203                             boot_info.initrd_end,
204                             kernel_cmdline,
205                             dtb_filename);
206     }
207 
208 }
209