2 * QEMU RISC-V Board Compatible with SiFive Freedom U SDK
4 * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
5 * Copyright (c) 2017 SiFive, Inc.
7 * Provides a board compatible with the SiFive Freedom U SDK:
10 * 1) CLINT (Core Level Interruptor)
11 * 2) PLIC (Platform Level Interrupt Controller)
13 * This board currently uses a hardcoded devicetree that indicates one hart.
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms and conditions of the GNU General Public License,
17 * version 2 or later, as published by the Free Software Foundation.
19 * This program is distributed in the hope it will be useful, but WITHOUT
20 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
21 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
24 * You should have received a copy of the GNU General Public License along with
25 * this program. If not, see <http://www.gnu.org/licenses/>.
28 #include "qemu/osdep.h"
30 #include "qemu/error-report.h"
31 #include "qapi/error.h"
33 #include "hw/boards.h"
34 #include "hw/loader.h"
35 #include "hw/sysbus.h"
36 #include "hw/char/serial.h"
37 #include "target/riscv/cpu.h"
38 #include "hw/riscv/riscv_hart.h"
39 #include "hw/riscv/sifive_plic.h"
40 #include "hw/riscv/sifive_clint.h"
41 #include "hw/riscv/sifive_uart.h"
42 #include "hw/riscv/sifive_prci.h"
43 #include "hw/riscv/sifive_u.h"
44 #include "chardev/char.h"
45 #include "sysemu/arch_init.h"
46 #include "sysemu/device_tree.h"
47 #include "exec/address-spaces.h"
52 static const struct MemmapEntry
{
55 } sifive_u_memmap
[] = {
56 [SIFIVE_U_DEBUG
] = { 0x0, 0x100 },
57 [SIFIVE_U_MROM
] = { 0x1000, 0x11000 },
58 [SIFIVE_U_CLINT
] = { 0x2000000, 0x10000 },
59 [SIFIVE_U_PLIC
] = { 0xc000000, 0x4000000 },
60 [SIFIVE_U_UART0
] = { 0x10013000, 0x1000 },
61 [SIFIVE_U_UART1
] = { 0x10023000, 0x1000 },
62 [SIFIVE_U_DRAM
] = { 0x80000000, 0x0 },
65 static uint64_t load_kernel(const char *kernel_filename
)
67 uint64_t kernel_entry
, kernel_high
;
69 if (load_elf(kernel_filename
, NULL
, NULL
,
70 &kernel_entry
, NULL
, &kernel_high
,
71 0, EM_RISCV
, 1, 0) < 0) {
72 error_report("qemu: could not load kernel '%s'", kernel_filename
);
78 static void create_fdt(SiFiveUState
*s
, const struct MemmapEntry
*memmap
,
79 uint64_t mem_size
, const char *cmdline
)
85 uint32_t plic_phandle
;
87 fdt
= s
->fdt
= create_device_tree(&s
->fdt_size
);
89 error_report("create_device_tree() failed");
93 qemu_fdt_setprop_string(fdt
, "/", "model", "ucbbar,spike-bare,qemu");
94 qemu_fdt_setprop_string(fdt
, "/", "compatible", "ucbbar,spike-bare-dev");
95 qemu_fdt_setprop_cell(fdt
, "/", "#size-cells", 0x2);
96 qemu_fdt_setprop_cell(fdt
, "/", "#address-cells", 0x2);
98 qemu_fdt_add_subnode(fdt
, "/soc");
99 qemu_fdt_setprop(fdt
, "/soc", "ranges", NULL
, 0);
100 qemu_fdt_setprop_string(fdt
, "/soc", "compatible", "ucbbar,spike-bare-soc");
101 qemu_fdt_setprop_cell(fdt
, "/soc", "#size-cells", 0x2);
102 qemu_fdt_setprop_cell(fdt
, "/soc", "#address-cells", 0x2);
104 nodename
= g_strdup_printf("/memory@%lx",
105 (long)memmap
[SIFIVE_U_DRAM
].base
);
106 qemu_fdt_add_subnode(fdt
, nodename
);
107 qemu_fdt_setprop_cells(fdt
, nodename
, "reg",
108 memmap
[SIFIVE_U_DRAM
].base
>> 32, memmap
[SIFIVE_U_DRAM
].base
,
109 mem_size
>> 32, mem_size
);
110 qemu_fdt_setprop_string(fdt
, nodename
, "device_type", "memory");
113 qemu_fdt_add_subnode(fdt
, "/cpus");
114 qemu_fdt_setprop_cell(fdt
, "/cpus", "timebase-frequency",
115 SIFIVE_CLINT_TIMEBASE_FREQ
);
116 qemu_fdt_setprop_cell(fdt
, "/cpus", "#size-cells", 0x0);
117 qemu_fdt_setprop_cell(fdt
, "/cpus", "#address-cells", 0x1);
119 for (cpu
= s
->soc
.num_harts
- 1; cpu
>= 0; cpu
--) {
120 nodename
= g_strdup_printf("/cpus/cpu@%d", cpu
);
121 char *intc
= g_strdup_printf("/cpus/cpu@%d/interrupt-controller", cpu
);
122 char *isa
= riscv_isa_string(&s
->soc
.harts
[cpu
]);
123 qemu_fdt_add_subnode(fdt
, nodename
);
124 qemu_fdt_setprop_cell(fdt
, nodename
, "clock-frequency",
125 SIFIVE_U_CLOCK_FREQ
);
126 qemu_fdt_setprop_string(fdt
, nodename
, "mmu-type", "riscv,sv48");
127 qemu_fdt_setprop_string(fdt
, nodename
, "riscv,isa", isa
);
128 qemu_fdt_setprop_string(fdt
, nodename
, "compatible", "riscv");
129 qemu_fdt_setprop_string(fdt
, nodename
, "status", "okay");
130 qemu_fdt_setprop_cell(fdt
, nodename
, "reg", cpu
);
131 qemu_fdt_setprop_string(fdt
, nodename
, "device_type", "cpu");
132 qemu_fdt_add_subnode(fdt
, intc
);
133 qemu_fdt_setprop_cell(fdt
, intc
, "phandle", 1);
134 qemu_fdt_setprop_cell(fdt
, intc
, "linux,phandle", 1);
135 qemu_fdt_setprop_string(fdt
, intc
, "compatible", "riscv,cpu-intc");
136 qemu_fdt_setprop(fdt
, intc
, "interrupt-controller", NULL
, 0);
137 qemu_fdt_setprop_cell(fdt
, intc
, "#interrupt-cells", 1);
143 cells
= g_new0(uint32_t, s
->soc
.num_harts
* 4);
144 for (cpu
= 0; cpu
< s
->soc
.num_harts
; cpu
++) {
146 g_strdup_printf("/cpus/cpu@%d/interrupt-controller", cpu
);
147 uint32_t intc_phandle
= qemu_fdt_get_phandle(fdt
, nodename
);
148 cells
[cpu
* 4 + 0] = cpu_to_be32(intc_phandle
);
149 cells
[cpu
* 4 + 1] = cpu_to_be32(IRQ_M_SOFT
);
150 cells
[cpu
* 4 + 2] = cpu_to_be32(intc_phandle
);
151 cells
[cpu
* 4 + 3] = cpu_to_be32(IRQ_M_TIMER
);
154 nodename
= g_strdup_printf("/soc/clint@%lx",
155 (long)memmap
[SIFIVE_U_CLINT
].base
);
156 qemu_fdt_add_subnode(fdt
, nodename
);
157 qemu_fdt_setprop_string(fdt
, nodename
, "compatible", "riscv,clint0");
158 qemu_fdt_setprop_cells(fdt
, nodename
, "reg",
159 0x0, memmap
[SIFIVE_U_CLINT
].base
,
160 0x0, memmap
[SIFIVE_U_CLINT
].size
);
161 qemu_fdt_setprop(fdt
, nodename
, "interrupts-extended",
162 cells
, s
->soc
.num_harts
* sizeof(uint32_t) * 4);
166 cells
= g_new0(uint32_t, s
->soc
.num_harts
* 4);
167 for (cpu
= 0; cpu
< s
->soc
.num_harts
; cpu
++) {
169 g_strdup_printf("/cpus/cpu@%d/interrupt-controller", cpu
);
170 uint32_t intc_phandle
= qemu_fdt_get_phandle(fdt
, nodename
);
171 cells
[cpu
* 4 + 0] = cpu_to_be32(intc_phandle
);
172 cells
[cpu
* 4 + 1] = cpu_to_be32(IRQ_M_EXT
);
173 cells
[cpu
* 4 + 2] = cpu_to_be32(intc_phandle
);
174 cells
[cpu
* 4 + 3] = cpu_to_be32(IRQ_S_EXT
);
177 nodename
= g_strdup_printf("/soc/interrupt-controller@%lx",
178 (long)memmap
[SIFIVE_U_PLIC
].base
);
179 qemu_fdt_add_subnode(fdt
, nodename
);
180 qemu_fdt_setprop_cell(fdt
, nodename
, "#interrupt-cells", 1);
181 qemu_fdt_setprop_string(fdt
, nodename
, "compatible", "riscv,plic0");
182 qemu_fdt_setprop(fdt
, nodename
, "interrupt-controller", NULL
, 0);
183 qemu_fdt_setprop(fdt
, nodename
, "interrupts-extended",
184 cells
, s
->soc
.num_harts
* sizeof(uint32_t) * 4);
185 qemu_fdt_setprop_cells(fdt
, nodename
, "reg",
186 0x0, memmap
[SIFIVE_U_PLIC
].base
,
187 0x0, memmap
[SIFIVE_U_PLIC
].size
);
188 qemu_fdt_setprop_string(fdt
, nodename
, "reg-names", "control");
189 qemu_fdt_setprop_cell(fdt
, nodename
, "riscv,max-priority", 7);
190 qemu_fdt_setprop_cell(fdt
, nodename
, "riscv,ndev", 4);
191 qemu_fdt_setprop_cells(fdt
, nodename
, "phandle", 2);
192 qemu_fdt_setprop_cells(fdt
, nodename
, "linux,phandle", 2);
193 plic_phandle
= qemu_fdt_get_phandle(fdt
, nodename
);
197 nodename
= g_strdup_printf("/uart@%lx",
198 (long)memmap
[SIFIVE_U_UART0
].base
);
199 qemu_fdt_add_subnode(fdt
, nodename
);
200 qemu_fdt_setprop_string(fdt
, nodename
, "compatible", "sifive,uart0");
201 qemu_fdt_setprop_cells(fdt
, nodename
, "reg",
202 0x0, memmap
[SIFIVE_U_UART0
].base
,
203 0x0, memmap
[SIFIVE_U_UART0
].size
);
204 qemu_fdt_setprop_cells(fdt
, nodename
, "interrupt-parent", plic_phandle
);
205 qemu_fdt_setprop_cells(fdt
, nodename
, "interrupts", 1);
207 qemu_fdt_add_subnode(fdt
, "/chosen");
208 qemu_fdt_setprop_string(fdt
, "/chosen", "stdout-path", nodename
);
209 qemu_fdt_setprop_string(fdt
, "/chosen", "bootargs", cmdline
);
213 static void riscv_sifive_u_init(MachineState
*machine
)
215 const struct MemmapEntry
*memmap
= sifive_u_memmap
;
217 SiFiveUState
*s
= g_new0(SiFiveUState
, 1);
218 MemoryRegion
*system_memory
= get_system_memory();
219 MemoryRegion
*main_mem
= g_new(MemoryRegion
, 1);
220 MemoryRegion
*mask_rom
= g_new(MemoryRegion
, 1);
224 object_initialize(&s
->soc
, sizeof(s
->soc
), TYPE_RISCV_HART_ARRAY
);
225 object_property_add_child(OBJECT(machine
), "soc", OBJECT(&s
->soc
),
227 object_property_set_str(OBJECT(&s
->soc
), SIFIVE_U_CPU
, "cpu-type",
229 object_property_set_int(OBJECT(&s
->soc
), smp_cpus
, "num-harts",
231 object_property_set_bool(OBJECT(&s
->soc
), true, "realized",
235 memory_region_init_ram(main_mem
, NULL
, "riscv.sifive.u.ram",
236 machine
->ram_size
, &error_fatal
);
237 memory_region_add_subregion(system_memory
, memmap
[SIFIVE_U_DRAM
].base
,
240 /* create device tree */
241 create_fdt(s
, memmap
, machine
->ram_size
, machine
->kernel_cmdline
);
244 memory_region_init_rom(mask_rom
, NULL
, "riscv.sifive.u.mrom",
245 memmap
[SIFIVE_U_MROM
].size
, &error_fatal
);
246 memory_region_add_subregion(system_memory
, memmap
[SIFIVE_U_MROM
].base
,
249 if (machine
->kernel_filename
) {
250 load_kernel(machine
->kernel_filename
);
254 uint32_t reset_vec
[8] = {
255 0x00000297, /* 1: auipc t0, %pcrel_hi(dtb) */
256 0x02028593, /* addi a1, t0, %pcrel_lo(1b) */
257 0xf1402573, /* csrr a0, mhartid */
258 #if defined(TARGET_RISCV32)
259 0x0182a283, /* lw t0, 24(t0) */
260 #elif defined(TARGET_RISCV64)
261 0x0182b283, /* ld t0, 24(t0) */
263 0x00028067, /* jr t0 */
265 memmap
[SIFIVE_U_DRAM
].base
, /* start: .dword DRAM_BASE */
270 /* copy in the reset vector in little_endian byte order */
271 for (i
= 0; i
< sizeof(reset_vec
) >> 2; i
++) {
272 reset_vec
[i
] = cpu_to_le32(reset_vec
[i
]);
274 rom_add_blob_fixed_as("mrom.reset", reset_vec
, sizeof(reset_vec
),
275 memmap
[SIFIVE_U_MROM
].base
, &address_space_memory
);
277 /* copy in the device tree */
278 if (fdt_pack(s
->fdt
) || fdt_totalsize(s
->fdt
) >
279 memmap
[SIFIVE_U_MROM
].size
- sizeof(reset_vec
)) {
280 error_report("not enough space to store device-tree");
283 qemu_fdt_dumpdtb(s
->fdt
, fdt_totalsize(s
->fdt
));
284 rom_add_blob_fixed_as("mrom.fdt", s
->fdt
, fdt_totalsize(s
->fdt
),
285 memmap
[SIFIVE_U_MROM
].base
+ sizeof(reset_vec
),
286 &address_space_memory
);
289 s
->plic
= sifive_plic_create(memmap
[SIFIVE_U_PLIC
].base
,
290 (char *)SIFIVE_U_PLIC_HART_CONFIG
,
291 SIFIVE_U_PLIC_NUM_SOURCES
,
292 SIFIVE_U_PLIC_NUM_PRIORITIES
,
293 SIFIVE_U_PLIC_PRIORITY_BASE
,
294 SIFIVE_U_PLIC_PENDING_BASE
,
295 SIFIVE_U_PLIC_ENABLE_BASE
,
296 SIFIVE_U_PLIC_ENABLE_STRIDE
,
297 SIFIVE_U_PLIC_CONTEXT_BASE
,
298 SIFIVE_U_PLIC_CONTEXT_STRIDE
,
299 memmap
[SIFIVE_U_PLIC
].size
);
300 sifive_uart_create(system_memory
, memmap
[SIFIVE_U_UART0
].base
,
301 serial_hd(0), SIFIVE_PLIC(s
->plic
)->irqs
[SIFIVE_U_UART0_IRQ
]);
302 /* sifive_uart_create(system_memory, memmap[SIFIVE_U_UART1].base,
303 serial_hd(1), SIFIVE_PLIC(s->plic)->irqs[SIFIVE_U_UART1_IRQ]); */
304 sifive_clint_create(memmap
[SIFIVE_U_CLINT
].base
,
305 memmap
[SIFIVE_U_CLINT
].size
, smp_cpus
,
306 SIFIVE_SIP_BASE
, SIFIVE_TIMECMP_BASE
, SIFIVE_TIME_BASE
);
309 static void riscv_sifive_u_machine_init(MachineClass
*mc
)
311 mc
->desc
= "RISC-V Board compatible with SiFive U SDK";
312 mc
->init
= riscv_sifive_u_init
;
316 DEFINE_MACHINE("sifive_u", riscv_sifive_u_machine_init
)