[Qemu-devel] [PULL 18/29] riscv: spike: Add a generic spike machine

[Palmer Dabbelt <palmer@sifive.com>]

From: Alistair Francis <Alistair.Francis@wdc.com>

Add a generic spike machine (not tied to a version) and deprecate the
spike mahines that are tied to a specific version. As we can now specify
the CPU via the command line we no londer need specific versions of the
spike machines.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Acked-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
---
 hw/riscv/spike.c     | 106 ++++++++++++++++++++++++++++++++++++++++++-
 qemu-deprecated.texi |   6 +++
 2 files changed, 111 insertions(+), 1 deletion(-)

diff --git a/hw/riscv/spike.c b/hw/riscv/spike.c
index 2a000a58009a..5b33d4be3bbc 100644
--- a/hw/riscv/spike.c
+++ b/hw/riscv/spike.c
@@ -39,6 +39,7 @@
 #include "chardev/char.h"
 #include "sysemu/arch_init.h"
 #include "sysemu/device_tree.h"
+#include "sysemu/qtest.h"
 #include "exec/address-spaces.h"
 #include "elf.h"
 
@@ -160,7 +161,89 @@ static void create_fdt(SpikeState *s, const struct MemmapEntry *memmap,
         qemu_fdt_add_subnode(fdt, "/chosen");
         qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", cmdline);
     }
- }
+}
+
+static void spike_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 *mask_rom = g_new(MemoryRegion, 1);
+    int i;
+
+    /* Initialize SOC */
+    object_initialize_child(OBJECT(machine), "soc", &s->soc, sizeof(s->soc),
+                            TYPE_RISCV_HART_ARRAY, &error_abort, NULL);
+    object_property_set_str(OBJECT(&s->soc), machine->cpu_type, "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_rom(mask_rom, NULL, "riscv.spike.mrom",
+                           memmap[SPIKE_MROM].size, &error_fatal);
+    memory_region_add_subregion(system_memory, memmap[SPIKE_MROM].base,
+                                mask_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 in little_endian byte order */
+    for (i = 0; i < sizeof(reset_vec) >> 2; i++) {
+        reset_vec[i] = cpu_to_le32(reset_vec[i]);
+    }
+    rom_add_blob_fixed_as("mrom.reset", reset_vec, sizeof(reset_vec),
+                          memmap[SPIKE_MROM].base, &address_space_memory);
+
+    /* copy in the device tree */
+    if (fdt_pack(s->fdt) || fdt_totalsize(s->fdt) >
+            memmap[SPIKE_MROM].size - sizeof(reset_vec)) {
+        error_report("not enough space to store device-tree");
+        exit(1);
+    }
+    qemu_fdt_dumpdtb(s->fdt, fdt_totalsize(s->fdt));
+    rom_add_blob_fixed_as("mrom.fdt", s->fdt, fdt_totalsize(s->fdt),
+                          memmap[SPIKE_MROM].base + sizeof(reset_vec),
+                          &address_space_memory);
+
+    /* initialize HTIF using symbols found in load_kernel */
+    htif_mm_init(system_memory, mask_rom, &s->soc.harts[0].env, serial_hd(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_10_0_board_init(MachineState *machine)
 {
@@ -172,6 +255,12 @@ static void spike_v1_10_0_board_init(MachineState *machine)
     MemoryRegion *mask_rom = g_new(MemoryRegion, 1);
     int i;
 
+    if (!qtest_enabled()) {
+        info_report("The Spike v1.10.0 machine has been deprecated. "
+                    "Please use the generic spike machine and specify the ISA "
+                    "versions using -cpu.");
+    }
+
     /* Initialize SOC */
     object_initialize_child(OBJECT(machine), "soc", &s->soc, sizeof(s->soc),
                             TYPE_RISCV_HART_ARRAY, &error_abort, NULL);
@@ -254,6 +343,12 @@ static void spike_v1_09_1_board_init(MachineState *machine)
     MemoryRegion *mask_rom = g_new(MemoryRegion, 1);
     int i;
 
+    if (!qtest_enabled()) {
+        info_report("The Spike v1.09.1 machine has been deprecated. "
+                    "Please use the generic spike machine and specify the ISA "
+                    "versions using -cpu.");
+    }
+
     /* Initialize SOC */
     object_initialize_child(OBJECT(machine), "soc", &s->soc, sizeof(s->soc),
                             TYPE_RISCV_HART_ARRAY, &error_abort, NULL);
@@ -359,8 +454,17 @@ 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;
+}
+
+static void spike_machine_init(MachineClass *mc)
+{
+    mc->desc = "RISC-V Spike Board";
+    mc->init = spike_board_init;
+    mc->max_cpus = 1;
     mc->is_default = 1;
+    mc->default_cpu_type = SPIKE_V1_10_0_CPU;
 }
 
 DEFINE_MACHINE("spike_v1.9.1", spike_v1_09_1_machine_init)
 DEFINE_MACHINE("spike_v1.10", spike_v1_10_0_machine_init)
+DEFINE_MACHINE("spike", spike_machine_init)
diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
index 9dca81f461e3..50292d820b0d 100644
--- a/qemu-deprecated.texi
+++ b/qemu-deprecated.texi
@@ -175,6 +175,12 @@ This machine type uses an unmaintained firmware, broken in lots of ways,
 and unable to start post-2004 operating systems. 40p machine type should be
 used instead.
 
+@subsection spike_v1.9.1 and spike_v1.10 (since 4.1)
+
+The version specific Spike machines have been deprecated in favour of the
+generic ``spike`` machine. If you need to specify an older version of the RISC-V
+spec you can use the ``-cpu rv64gcsu,priv_spec=v1.9.1`` command line argument.
+
 @section Device options
 
 @subsection Block device options
-- 
2.21.0