1 | /* |
2 | * Raspberry Pi emulation (c) 2012 Gregory Estrade |
3 | * Upstreaming code cleanup [including bcm2835_*] (c) 2013 Jan Petrous |
4 | * |
5 | * Rasperry Pi 2 emulation Copyright (c) 2015, Microsoft |
6 | * Written by Andrew Baumann |
7 | * |
8 | * Raspberry Pi 3 emulation Copyright (c) 2018 Zoltán Baldaszti |
9 | * Upstream code cleanup (c) 2018 Pekka Enberg |
10 | * |
11 | * This code is licensed under the GNU GPLv2 and later. |
12 | */ |
13 | |
14 | #include "qemu/osdep.h" |
15 | #include "qemu/units.h" |
16 | #include "qapi/error.h" |
17 | #include "cpu.h" |
18 | #include "hw/arm/bcm2836.h" |
19 | #include "qemu/error-report.h" |
20 | #include "hw/boards.h" |
21 | #include "hw/loader.h" |
22 | #include "hw/arm/boot.h" |
23 | #include "sysemu/sysemu.h" |
24 | |
25 | #define SMPBOOT_ADDR 0x300 /* this should leave enough space for ATAGS */ |
26 | #define MVBAR_ADDR 0x400 /* secure vectors */ |
27 | #define BOARDSETUP_ADDR (MVBAR_ADDR + 0x20) /* board setup code */ |
28 | #define FIRMWARE_ADDR_2 0x8000 /* Pi 2 loads kernel.img here by default */ |
29 | #define FIRMWARE_ADDR_3 0x80000 /* Pi 3 loads kernel.img here by default */ |
30 | #define SPINTABLE_ADDR 0xd8 /* Pi 3 bootloader spintable */ |
31 | |
32 | /* Table of Linux board IDs for different Pi versions */ |
33 | static const int raspi_boardid[] = {[1] = 0xc42, [2] = 0xc43, [3] = 0xc44}; |
34 | |
35 | typedef struct RasPiState { |
36 | BCM283XState soc; |
37 | MemoryRegion ram; |
38 | } RasPiState; |
39 | |
40 | static void write_smpboot(ARMCPU *cpu, const struct arm_boot_info *info) |
41 | { |
42 | static const uint32_t smpboot[] = { |
43 | 0xe1a0e00f, /* mov lr, pc */ |
44 | 0xe3a0fe00 + (BOARDSETUP_ADDR >> 4), /* mov pc, BOARDSETUP_ADDR */ |
45 | 0xee100fb0, /* mrc p15, 0, r0, c0, c0, 5;get core ID */ |
46 | 0xe7e10050, /* ubfx r0, r0, #0, #2 ;extract LSB */ |
47 | 0xe59f5014, /* ldr r5, =0x400000CC ;load mbox base */ |
48 | 0xe320f001, /* 1: yield */ |
49 | 0xe7953200, /* ldr r3, [r5, r0, lsl #4] ;read mbox for our core*/ |
50 | 0xe3530000, /* cmp r3, #0 ;spin while zero */ |
51 | 0x0afffffb, /* beq 1b */ |
52 | 0xe7853200, /* str r3, [r5, r0, lsl #4] ;clear mbox */ |
53 | 0xe12fff13, /* bx r3 ;jump to target */ |
54 | 0x400000cc, /* (constant: mailbox 3 read/clear base) */ |
55 | }; |
56 | |
57 | /* check that we don't overrun board setup vectors */ |
58 | QEMU_BUILD_BUG_ON(SMPBOOT_ADDR + sizeof(smpboot) > MVBAR_ADDR); |
59 | /* check that board setup address is correctly relocated */ |
60 | QEMU_BUILD_BUG_ON((BOARDSETUP_ADDR & 0xf) != 0 |
61 | || (BOARDSETUP_ADDR >> 4) >= 0x100); |
62 | |
63 | rom_add_blob_fixed("raspi_smpboot" , smpboot, sizeof(smpboot), |
64 | info->smp_loader_start); |
65 | } |
66 | |
67 | static void write_smpboot64(ARMCPU *cpu, const struct arm_boot_info *info) |
68 | { |
69 | /* Unlike the AArch32 version we don't need to call the board setup hook. |
70 | * The mechanism for doing the spin-table is also entirely different. |
71 | * We must have four 64-bit fields at absolute addresses |
72 | * 0xd8, 0xe0, 0xe8, 0xf0 in RAM, which are the flag variables for |
73 | * our CPUs, and which we must ensure are zero initialized before |
74 | * the primary CPU goes into the kernel. We put these variables inside |
75 | * a rom blob, so that the reset for ROM contents zeroes them for us. |
76 | */ |
77 | static const uint32_t smpboot[] = { |
78 | 0xd2801b05, /* mov x5, 0xd8 */ |
79 | 0xd53800a6, /* mrs x6, mpidr_el1 */ |
80 | 0x924004c6, /* and x6, x6, #0x3 */ |
81 | 0xd503205f, /* spin: wfe */ |
82 | 0xf86678a4, /* ldr x4, [x5,x6,lsl #3] */ |
83 | 0xb4ffffc4, /* cbz x4, spin */ |
84 | 0xd2800000, /* mov x0, #0x0 */ |
85 | 0xd2800001, /* mov x1, #0x0 */ |
86 | 0xd2800002, /* mov x2, #0x0 */ |
87 | 0xd2800003, /* mov x3, #0x0 */ |
88 | 0xd61f0080, /* br x4 */ |
89 | }; |
90 | |
91 | static const uint64_t spintables[] = { |
92 | 0, 0, 0, 0 |
93 | }; |
94 | |
95 | rom_add_blob_fixed("raspi_smpboot" , smpboot, sizeof(smpboot), |
96 | info->smp_loader_start); |
97 | rom_add_blob_fixed("raspi_spintables" , spintables, sizeof(spintables), |
98 | SPINTABLE_ADDR); |
99 | } |
100 | |
101 | static void write_board_setup(ARMCPU *cpu, const struct arm_boot_info *info) |
102 | { |
103 | arm_write_secure_board_setup_dummy_smc(cpu, info, MVBAR_ADDR); |
104 | } |
105 | |
106 | static void reset_secondary(ARMCPU *cpu, const struct arm_boot_info *info) |
107 | { |
108 | CPUState *cs = CPU(cpu); |
109 | cpu_set_pc(cs, info->smp_loader_start); |
110 | } |
111 | |
112 | static void setup_boot(MachineState *machine, int version, size_t ram_size) |
113 | { |
114 | static struct arm_boot_info binfo; |
115 | int r; |
116 | |
117 | binfo.board_id = raspi_boardid[version]; |
118 | binfo.ram_size = ram_size; |
119 | binfo.nb_cpus = machine->smp.cpus; |
120 | |
121 | if (version <= 2) { |
122 | /* The rpi1 and 2 require some custom setup code to run in Secure |
123 | * mode before booting a kernel (to set up the SMC vectors so |
124 | * that we get a no-op SMC; this is used by Linux to call the |
125 | * firmware for some cache maintenance operations. |
126 | * The rpi3 doesn't need this. |
127 | */ |
128 | binfo.board_setup_addr = BOARDSETUP_ADDR; |
129 | binfo.write_board_setup = write_board_setup; |
130 | binfo.secure_board_setup = true; |
131 | binfo.secure_boot = true; |
132 | } |
133 | |
134 | /* Pi2 and Pi3 requires SMP setup */ |
135 | if (version >= 2) { |
136 | binfo.smp_loader_start = SMPBOOT_ADDR; |
137 | if (version == 2) { |
138 | binfo.write_secondary_boot = write_smpboot; |
139 | } else { |
140 | binfo.write_secondary_boot = write_smpboot64; |
141 | } |
142 | binfo.secondary_cpu_reset_hook = reset_secondary; |
143 | } |
144 | |
145 | /* If the user specified a "firmware" image (e.g. UEFI), we bypass |
146 | * the normal Linux boot process |
147 | */ |
148 | if (machine->firmware) { |
149 | hwaddr firmware_addr = version == 3 ? FIRMWARE_ADDR_3 : FIRMWARE_ADDR_2; |
150 | /* load the firmware image (typically kernel.img) */ |
151 | r = load_image_targphys(machine->firmware, firmware_addr, |
152 | ram_size - firmware_addr); |
153 | if (r < 0) { |
154 | error_report("Failed to load firmware from %s" , machine->firmware); |
155 | exit(1); |
156 | } |
157 | |
158 | binfo.entry = firmware_addr; |
159 | binfo.firmware_loaded = true; |
160 | } |
161 | |
162 | arm_load_kernel(ARM_CPU(first_cpu), machine, &binfo); |
163 | } |
164 | |
165 | static void raspi_init(MachineState *machine, int version) |
166 | { |
167 | RasPiState *s = g_new0(RasPiState, 1); |
168 | uint32_t vcram_size; |
169 | DriveInfo *di; |
170 | BlockBackend *blk; |
171 | BusState *bus; |
172 | DeviceState *carddev; |
173 | |
174 | if (machine->ram_size > 1 * GiB) { |
175 | error_report("Requested ram size is too large for this machine: " |
176 | "maximum is 1GB" ); |
177 | exit(1); |
178 | } |
179 | |
180 | object_initialize_child(OBJECT(machine), "soc" , &s->soc, sizeof(s->soc), |
181 | version == 3 ? TYPE_BCM2837 : TYPE_BCM2836, |
182 | &error_abort, NULL); |
183 | |
184 | /* Allocate and map RAM */ |
185 | memory_region_allocate_system_memory(&s->ram, OBJECT(machine), "ram" , |
186 | machine->ram_size); |
187 | /* FIXME: Remove when we have custom CPU address space support */ |
188 | memory_region_add_subregion_overlap(get_system_memory(), 0, &s->ram, 0); |
189 | |
190 | /* Setup the SOC */ |
191 | object_property_add_const_link(OBJECT(&s->soc), "ram" , OBJECT(&s->ram), |
192 | &error_abort); |
193 | object_property_set_int(OBJECT(&s->soc), machine->smp.cpus, "enabled-cpus" , |
194 | &error_abort); |
195 | int board_rev = version == 3 ? 0xa02082 : 0xa21041; |
196 | object_property_set_int(OBJECT(&s->soc), board_rev, "board-rev" , |
197 | &error_abort); |
198 | object_property_set_bool(OBJECT(&s->soc), true, "realized" , &error_abort); |
199 | |
200 | /* Create and plug in the SD cards */ |
201 | di = drive_get_next(IF_SD); |
202 | blk = di ? blk_by_legacy_dinfo(di) : NULL; |
203 | bus = qdev_get_child_bus(DEVICE(&s->soc), "sd-bus" ); |
204 | if (bus == NULL) { |
205 | error_report("No SD bus found in SOC object" ); |
206 | exit(1); |
207 | } |
208 | carddev = qdev_create(bus, TYPE_SD_CARD); |
209 | qdev_prop_set_drive(carddev, "drive" , blk, &error_fatal); |
210 | object_property_set_bool(OBJECT(carddev), true, "realized" , &error_fatal); |
211 | |
212 | vcram_size = object_property_get_uint(OBJECT(&s->soc), "vcram-size" , |
213 | &error_abort); |
214 | setup_boot(machine, version, machine->ram_size - vcram_size); |
215 | } |
216 | |
217 | static void raspi2_init(MachineState *machine) |
218 | { |
219 | raspi_init(machine, 2); |
220 | } |
221 | |
222 | static void raspi2_machine_init(MachineClass *mc) |
223 | { |
224 | mc->desc = "Raspberry Pi 2" ; |
225 | mc->init = raspi2_init; |
226 | mc->block_default_type = IF_SD; |
227 | mc->no_parallel = 1; |
228 | mc->no_floppy = 1; |
229 | mc->no_cdrom = 1; |
230 | mc->max_cpus = BCM283X_NCPUS; |
231 | mc->min_cpus = BCM283X_NCPUS; |
232 | mc->default_cpus = BCM283X_NCPUS; |
233 | mc->default_ram_size = 1024 * 1024 * 1024; |
234 | mc->ignore_memory_transaction_failures = true; |
235 | }; |
236 | DEFINE_MACHINE("raspi2" , raspi2_machine_init) |
237 | |
238 | #ifdef TARGET_AARCH64 |
239 | static void raspi3_init(MachineState *machine) |
240 | { |
241 | raspi_init(machine, 3); |
242 | } |
243 | |
244 | static void raspi3_machine_init(MachineClass *mc) |
245 | { |
246 | mc->desc = "Raspberry Pi 3" ; |
247 | mc->init = raspi3_init; |
248 | mc->block_default_type = IF_SD; |
249 | mc->no_parallel = 1; |
250 | mc->no_floppy = 1; |
251 | mc->no_cdrom = 1; |
252 | mc->max_cpus = BCM283X_NCPUS; |
253 | mc->min_cpus = BCM283X_NCPUS; |
254 | mc->default_cpus = BCM283X_NCPUS; |
255 | mc->default_ram_size = 1024 * 1024 * 1024; |
256 | } |
257 | DEFINE_MACHINE("raspi3" , raspi3_machine_init) |
258 | #endif |
259 | |