RISC-V machines compatble with Spike aka riscv-isa-sim, the RISC-V
Instruction Set Simulator. The following machines are implemented:

- 'spike_v1.9.1'; HTIF console, config-string, Privileged ISA Version 1.9.1
- 'spike_v1.10'; HTIF console, device-tree, Privileged ISA Version 1.10

Acked-by: Richard Henderson <richard.hender...@linaro.org>
Signed-off-by: Sagar Karandikar <sag...@eecs.berkeley.edu>
Signed-off-by: Michael Clark <m...@sifive.com>
---
 hw/riscv/spike.c         | 376 +++++++++++++++++++++++++++++++++++++++++++++++
 include/hw/riscv/spike.h |  53 +++++++
 2 files changed, 429 insertions(+)
 create mode 100644 hw/riscv/spike.c
 create mode 100644 include/hw/riscv/spike.h

diff --git a/hw/riscv/spike.c b/hw/riscv/spike.c
new file mode 100644
index 0000000..2d1f114
--- /dev/null
+++ b/hw/riscv/spike.c
@@ -0,0 +1,376 @@
+/*
+ * QEMU RISC-V Spike Board
+ *
+ * Copyright (c) 2016-2017 Sagar Karandikar, sag...@eecs.berkeley.edu
+ * Copyright (c) 2017-2018 SiFive, Inc.
+ *
+ * This provides a RISC-V Board with the following devices:
+ *
+ * 0) HTIF Console and Poweroff
+ * 1) CLINT (Timer and IPI)
+ * 2) PLIC (Platform Level Interrupt Controller)
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2 or later, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "qemu/error-report.h"
+#include "qapi/error.h"
+#include "hw/hw.h"
+#include "hw/boards.h"
+#include "hw/loader.h"
+#include "hw/sysbus.h"
+#include "target/riscv/cpu.h"
+#include "hw/riscv/riscv_htif.h"
+#include "hw/riscv/riscv_hart.h"
+#include "hw/riscv/sifive_clint.h"
+#include "hw/riscv/spike.h"
+#include "chardev/char.h"
+#include "sysemu/arch_init.h"
+#include "sysemu/device_tree.h"
+#include "exec/address-spaces.h"
+#include "elf.h"
+
+static const struct MemmapEntry {
+    hwaddr base;
+    hwaddr size;
+} spike_memmap[] = {
+    [SPIKE_MROM] =     {     0x1000,     0x2000 },
+    [SPIKE_CLINT] =    {  0x2000000,    0x10000 },
+    [SPIKE_DRAM] =     { 0x80000000,        0x0 },
+};
+
+static void copy_le32_to_phys(hwaddr pa, uint32_t *rom, size_t len)
+{
+    int i;
+    for (i = 0; i < (len >> 2); i++) {
+        stl_phys(&address_space_memory, pa + (i << 2), rom[i]);
+    }
+}
+
+static uint64_t identity_translate(void *opaque, uint64_t addr)
+{
+    return addr;
+}
+
+static uint64_t load_kernel(const char *kernel_filename)
+{
+    uint64_t kernel_entry, kernel_high;
+
+    if (load_elf_ram_sym(kernel_filename, identity_translate, NULL,
+            &kernel_entry, NULL, &kernel_high, 0, ELF_MACHINE, 1, 0,
+            NULL, true, htif_symbol_callback) < 0) {
+        error_report("qemu: could not load kernel '%s'", kernel_filename);
+        exit(1);
+    }
+    return kernel_entry;
+}
+
+static void create_fdt(SpikeState *s, const struct MemmapEntry *memmap,
+    uint64_t mem_size, const char *cmdline)
+{
+    void *fdt;
+    int cpu;
+    uint32_t *cells;
+    char *nodename;
+
+    fdt = s->fdt = create_device_tree(&s->fdt_size);
+    if (!fdt) {
+        error_report("create_device_tree() failed");
+        exit(1);
+    }
+
+    qemu_fdt_setprop_string(fdt, "/", "model", "ucbbar,spike-bare,qemu");
+    qemu_fdt_setprop_string(fdt, "/", "compatible", "ucbbar,spike-bare-dev");
+    qemu_fdt_setprop_cell(fdt, "/", "#size-cells", 0x2);
+    qemu_fdt_setprop_cell(fdt, "/", "#address-cells", 0x2);
+
+    qemu_fdt_add_subnode(fdt, "/htif");
+    qemu_fdt_setprop_string(fdt, "/htif", "compatible", "ucb,htif0");
+
+    qemu_fdt_add_subnode(fdt, "/soc");
+    qemu_fdt_setprop(fdt, "/soc", "ranges", NULL, 0);
+    qemu_fdt_setprop_string(fdt, "/soc", "compatible", 
"ucbbar,spike-bare-soc");
+    qemu_fdt_setprop_cell(fdt, "/soc", "#size-cells", 0x2);
+    qemu_fdt_setprop_cell(fdt, "/soc", "#address-cells", 0x2);
+
+    nodename = g_strdup_printf("/memory@%lx",
+        (long)memmap[SPIKE_DRAM].base);
+    qemu_fdt_add_subnode(fdt, nodename);
+    qemu_fdt_setprop_cells(fdt, nodename, "reg",
+        memmap[SPIKE_DRAM].base >> 32, memmap[SPIKE_DRAM].base,
+        mem_size >> 32, mem_size);
+    qemu_fdt_setprop_string(fdt, nodename, "device_type", "memory");
+    g_free(nodename);
+
+    qemu_fdt_add_subnode(fdt, "/cpus");
+    qemu_fdt_setprop_cell(fdt, "/cpus", "timebase-frequency", 10000000);
+    qemu_fdt_setprop_cell(fdt, "/cpus", "#size-cells", 0x0);
+    qemu_fdt_setprop_cell(fdt, "/cpus", "#address-cells", 0x1);
+
+    for (cpu = s->soc.num_harts - 1; cpu >= 0; cpu--) {
+        nodename = g_strdup_printf("/cpus/cpu@%d", cpu);
+        char *intc = g_strdup_printf("/cpus/cpu@%d/interrupt-controller", cpu);
+        char *isa = riscv_isa_string(&s->soc.harts[cpu]);
+        qemu_fdt_add_subnode(fdt, nodename);
+        qemu_fdt_setprop_cell(fdt, nodename, "clock-frequency", 1000000000);
+        qemu_fdt_setprop_string(fdt, nodename, "mmu-type", "riscv,sv48");
+        qemu_fdt_setprop_string(fdt, nodename, "riscv,isa", isa);
+        qemu_fdt_setprop_string(fdt, nodename, "compatible", "riscv");
+        qemu_fdt_setprop_string(fdt, nodename, "status", "okay");
+        qemu_fdt_setprop_cell(fdt, nodename, "reg", cpu);
+        qemu_fdt_setprop_string(fdt, nodename, "device_type", "cpu");
+        qemu_fdt_add_subnode(fdt, intc);
+        qemu_fdt_setprop_cell(fdt, intc, "phandle", 1);
+        qemu_fdt_setprop_cell(fdt, intc, "linux,phandle", 1);
+        qemu_fdt_setprop_string(fdt, intc, "compatible", "riscv,cpu-intc");
+        qemu_fdt_setprop(fdt, intc, "interrupt-controller", NULL, 0);
+        qemu_fdt_setprop_cell(fdt, intc, "#interrupt-cells", 1);
+        g_free(isa);
+        g_free(intc);
+        g_free(nodename);
+    }
+
+    cells =  g_new0(uint32_t, s->soc.num_harts * 4);
+    for (cpu = 0; cpu < s->soc.num_harts; cpu++) {
+        nodename =
+            g_strdup_printf("/cpus/cpu@%d/interrupt-controller", cpu);
+        uint32_t intc_phandle = qemu_fdt_get_phandle(fdt, nodename);
+        cells[cpu * 4 + 0] = cpu_to_be32(intc_phandle);
+        cells[cpu * 4 + 1] = cpu_to_be32(IRQ_M_SOFT);
+        cells[cpu * 4 + 2] = cpu_to_be32(intc_phandle);
+        cells[cpu * 4 + 3] = cpu_to_be32(IRQ_M_TIMER);
+        g_free(nodename);
+    }
+    nodename = g_strdup_printf("/soc/clint@%lx",
+        (long)memmap[SPIKE_CLINT].base);
+    qemu_fdt_add_subnode(fdt, nodename);
+    qemu_fdt_setprop_string(fdt, nodename, "compatible", "riscv,clint0");
+    qemu_fdt_setprop_cells(fdt, nodename, "reg",
+        0x0, memmap[SPIKE_CLINT].base,
+        0x0, memmap[SPIKE_CLINT].size);
+    qemu_fdt_setprop(fdt, nodename, "interrupts-extended",
+        cells, s->soc.num_harts * sizeof(uint32_t) * 4);
+    g_free(cells);
+    g_free(nodename);
+
+    qemu_fdt_add_subnode(fdt, "/chosen");
+    qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", cmdline);
+ }
+
+static void spike_v1_10_0_board_init(MachineState *machine)
+{
+    const struct MemmapEntry *memmap = spike_memmap;
+
+    SpikeState *s = g_new0(SpikeState, 1);
+    MemoryRegion *system_memory = get_system_memory();
+    MemoryRegion *main_mem = g_new(MemoryRegion, 1);
+    MemoryRegion *boot_rom = g_new(MemoryRegion, 1);
+
+    /* Initialize SOC */
+    object_initialize(&s->soc, sizeof(s->soc), TYPE_RISCV_HART_ARRAY);
+    object_property_add_child(OBJECT(machine), "soc", OBJECT(&s->soc),
+                              &error_abort);
+    object_property_set_str(OBJECT(&s->soc), SPIKE_V1_10_0_CPU, "cpu-type",
+                            &error_abort);
+    object_property_set_int(OBJECT(&s->soc), smp_cpus, "num-harts",
+                            &error_abort);
+    object_property_set_bool(OBJECT(&s->soc), true, "realized",
+                            &error_abort);
+
+    /* register system main memory (actual RAM) */
+    memory_region_init_ram(main_mem, NULL, "riscv.spike.ram",
+                           machine->ram_size, &error_fatal);
+    memory_region_add_subregion(system_memory, memmap[SPIKE_DRAM].base,
+        main_mem);
+
+    /* create device tree */
+    create_fdt(s, memmap, machine->ram_size, machine->kernel_cmdline);
+
+    /* boot rom */
+    memory_region_init_ram(boot_rom, NULL, "riscv.spike.bootrom",
+                           s->fdt_size + 0x2000, &error_fatal);
+    memory_region_add_subregion(system_memory, 0x0, boot_rom);
+
+    if (machine->kernel_filename) {
+        load_kernel(machine->kernel_filename);
+    }
+
+    /* reset vector */
+    uint32_t reset_vec[8] = {
+        0x00000297,                  /* 1:  auipc  t0, %pcrel_hi(dtb) */
+        0x02028593,                  /*     addi   a1, t0, %pcrel_lo(1b) */
+        0xf1402573,                  /*     csrr   a0, mhartid  */
+#if defined(TARGET_RISCV32)
+        0x0182a283,                  /*     lw     t0, 24(t0) */
+#elif defined(TARGET_RISCV64)
+        0x0182b283,                  /*     ld     t0, 24(t0) */
+#endif
+        0x00028067,                  /*     jr     t0 */
+        0x00000000,
+        memmap[SPIKE_DRAM].base,     /* start: .dword DRAM_BASE */
+        0x00000000,
+                                     /* dtb: */
+    };
+
+    /* copy in the reset vector */
+    copy_le32_to_phys(memmap[SPIKE_MROM].base, reset_vec, sizeof(reset_vec));
+
+    /* copy in the device tree */
+    qemu_fdt_dumpdtb(s->fdt, s->fdt_size);
+    cpu_physical_memory_write(memmap[SPIKE_MROM].base + sizeof(reset_vec),
+        s->fdt, s->fdt_size);
+
+    /* initialize HTIF using symbols found in load_kernel */
+    htif_mm_init(system_memory, boot_rom, &s->soc.harts[0].env, serial_hds[0]);
+
+    /* Core Local Interruptor (timer and IPI) */
+    sifive_clint_create(memmap[SPIKE_CLINT].base, memmap[SPIKE_CLINT].size,
+        smp_cpus, SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE);
+}
+
+static void spike_v1_09_1_board_init(MachineState *machine)
+{
+    const struct MemmapEntry *memmap = spike_memmap;
+
+    SpikeState *s = g_new0(SpikeState, 1);
+    MemoryRegion *system_memory = get_system_memory();
+    MemoryRegion *main_mem = g_new(MemoryRegion, 1);
+    MemoryRegion *boot_rom = g_new(MemoryRegion, 1);
+
+    /* Initialize SOC */
+    object_initialize(&s->soc, sizeof(s->soc), TYPE_RISCV_HART_ARRAY);
+    object_property_add_child(OBJECT(machine), "soc", OBJECT(&s->soc),
+                              &error_abort);
+    object_property_set_str(OBJECT(&s->soc), SPIKE_V1_09_1_CPU, "cpu-type",
+                            &error_abort);
+    object_property_set_int(OBJECT(&s->soc), smp_cpus, "num-harts",
+                            &error_abort);
+    object_property_set_bool(OBJECT(&s->soc), true, "realized",
+                            &error_abort);
+
+    /* register system main memory (actual RAM) */
+    memory_region_init_ram(main_mem, NULL, "riscv.spike.ram",
+                           machine->ram_size, &error_fatal);
+    memory_region_add_subregion(system_memory, memmap[SPIKE_DRAM].base,
+        main_mem);
+
+    /* boot rom */
+    memory_region_init_ram(boot_rom, NULL, "riscv.spike.bootrom",
+                           0x40000, &error_fatal);
+    memory_region_add_subregion(system_memory, 0x0, boot_rom);
+
+    if (machine->kernel_filename) {
+        load_kernel(machine->kernel_filename);
+    }
+
+    /* reset vector */
+    uint32_t reset_vec[8] = {
+        0x297 + memmap[SPIKE_DRAM].base - memmap[SPIKE_MROM].base, /* lui */
+        0x00028067,                   /* jump to DRAM_BASE */
+        0x00000000,                   /* reserved */
+        memmap[SPIKE_MROM].base + sizeof(reset_vec), /* config string pointer 
*/
+        0, 0, 0, 0                    /* trap vector */
+    };
+
+    /* part one of config string - before memory size specified */
+    const char *config_string_tmpl =
+        "platform {\n"
+        "  vendor ucb;\n"
+        "  arch spike;\n"
+        "};\n"
+        "rtc {\n"
+        "  addr 0x%" PRIx64 "x;\n"
+        "};\n"
+        "ram {\n"
+        "  0 {\n"
+        "    addr 0x%" PRIx64 "x;\n"
+        "    size 0x%" PRIx64 "x;\n"
+        "  };\n"
+        "};\n"
+        "core {\n"
+        "  0" " {\n"
+        "    " "0 {\n"
+        "      isa %s;\n"
+        "      timecmp 0x%" PRIx64 "x;\n"
+        "      ipi 0x%" PRIx64 "x;\n"
+        "    };\n"
+        "  };\n"
+        "};\n";
+
+    /* build config string with supplied memory size */
+    char *isa = riscv_isa_string(&s->soc.harts[0]);
+    size_t config_string_size = strlen(config_string_tmpl) + 48;
+    char *config_string = malloc(config_string_size);
+    snprintf(config_string, config_string_size, config_string_tmpl,
+        (uint64_t)memmap[SPIKE_CLINT].base + SIFIVE_TIME_BASE,
+        (uint64_t)memmap[SPIKE_DRAM].base,
+        (uint64_t)ram_size, isa,
+        (uint64_t)memmap[SPIKE_CLINT].base + SIFIVE_TIMECMP_BASE,
+        (uint64_t)memmap[SPIKE_CLINT].base + SIFIVE_SIP_BASE);
+    g_free(isa);
+    size_t config_string_len = strlen(config_string);
+
+    /* copy in the reset vector */
+    copy_le32_to_phys(memmap[SPIKE_MROM].base, reset_vec, sizeof(reset_vec));
+
+    /* copy in the config string */
+    cpu_physical_memory_write(memmap[SPIKE_MROM].base + sizeof(reset_vec),
+        config_string, config_string_len);
+
+    /* initialize HTIF using symbols found in load_kernel */
+    htif_mm_init(system_memory, boot_rom, &s->soc.harts[0].env, serial_hds[0]);
+
+    /* Core Local Interruptor (timer and IPI) */
+    sifive_clint_create(memmap[SPIKE_CLINT].base, memmap[SPIKE_CLINT].size,
+        smp_cpus, SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE);
+}
+
+static const TypeInfo spike_v_1_09_1_device = {
+    .name          = TYPE_RISCV_SPIKE_V1_09_1_BOARD,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(SpikeState),
+};
+
+static const TypeInfo spike_v_1_10_0_device = {
+    .name          = TYPE_RISCV_SPIKE_V1_10_0_BOARD,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(SpikeState),
+};
+
+static void spike_v1_09_1_machine_init(MachineClass *mc)
+{
+    mc->desc = "RISC-V Spike Board (Privileged ISA v1.9.1)";
+    mc->init = spike_v1_09_1_board_init;
+    mc->max_cpus = 1;
+}
+
+static void spike_v1_10_0_machine_init(MachineClass *mc)
+{
+    mc->desc = "RISC-V Spike Board (Privileged ISA v1.10)";
+    mc->init = spike_v1_10_0_board_init;
+    mc->max_cpus = 1;
+    mc->is_default = 1;
+}
+
+DEFINE_MACHINE("spike_v1.9.1", spike_v1_09_1_machine_init)
+DEFINE_MACHINE("spike_v1.10", spike_v1_10_0_machine_init)
+
+static void riscv_spike_board_register_types(void)
+{
+    type_register_static(&spike_v_1_09_1_device);
+    type_register_static(&spike_v_1_10_0_device);
+}
+
+type_init(riscv_spike_board_register_types);
diff --git a/include/hw/riscv/spike.h b/include/hw/riscv/spike.h
new file mode 100644
index 0000000..53d5eea
--- /dev/null
+++ b/include/hw/riscv/spike.h
@@ -0,0 +1,53 @@
+/*
+ * Spike machine interface
+ *
+ * Copyright (c) 2017 SiFive, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2 or later, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef HW_SPIKE_H
+#define HW_SPIKE_H
+
+#define TYPE_RISCV_SPIKE_V1_09_1_BOARD "riscv.spike_v1_9"
+#define TYPE_RISCV_SPIKE_V1_10_0_BOARD "riscv.spike_v1_10"
+
+#define SPIKE(obj) \
+    OBJECT_CHECK(SpikeState, (obj), TYPE_RISCV_SPIKE_BOARD)
+
+typedef struct {
+    /*< private >*/
+    SysBusDevice parent_obj;
+
+    /*< public >*/
+    RISCVHartArrayState soc;
+    void *fdt;
+    int fdt_size;
+} SpikeState;
+
+
+enum {
+    SPIKE_MROM,
+    SPIKE_CLINT,
+    SPIKE_DRAM
+};
+
+#if defined(TARGET_RISCV32)
+#define SPIKE_V1_09_1_CPU TYPE_RISCV_CPU_RV32GCSU_V1_09_1
+#define SPIKE_V1_10_0_CPU TYPE_RISCV_CPU_RV32GCSU_V1_10_0
+#elif defined(TARGET_RISCV64)
+#define SPIKE_V1_09_1_CPU TYPE_RISCV_CPU_RV64GCSU_V1_09_1
+#define SPIKE_V1_10_0_CPU TYPE_RISCV_CPU_RV64GCSU_V1_10_0
+#endif
+
+#endif
-- 
2.7.0


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