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[PATCH v2 1/3] riscv: Unify Qemu's reset vector code path


From: Atish Patra
Subject: [PATCH v2 1/3] riscv: Unify Qemu's reset vector code path
Date: Thu, 25 Jun 2020 11:37:39 -0700

Currently, all riscv machines except sifive_u have identical reset vector
code implementations with memory addresses being different for all machines.
They can be easily combined into a single function in common code.

Move it to common function and let all the machines use the common function.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
---
 hw/riscv/boot.c         | 46 +++++++++++++++++++++++++++++++++++++++++
 hw/riscv/spike.c        | 38 +++-------------------------------
 hw/riscv/virt.c         | 37 +++------------------------------
 include/hw/riscv/boot.h |  2 ++
 4 files changed, 54 insertions(+), 69 deletions(-)

diff --git a/hw/riscv/boot.c b/hw/riscv/boot.c
index adb421b91b68..8ed96da600c9 100644
--- a/hw/riscv/boot.c
+++ b/hw/riscv/boot.c
@@ -22,12 +22,16 @@
 #include "qemu/units.h"
 #include "qemu/error-report.h"
 #include "exec/cpu-defs.h"
+#include "exec/address-spaces.h"
 #include "hw/boards.h"
 #include "hw/loader.h"
 #include "hw/riscv/boot.h"
 #include "elf.h"
+#include "sysemu/device_tree.h"
 #include "sysemu/qtest.h"
 
+#include <libfdt.h>
+
 #if defined(TARGET_RISCV32)
 # define KERNEL_BOOT_ADDRESS 0x80400000
 #else
@@ -155,3 +159,45 @@ hwaddr riscv_load_initrd(const char *filename, uint64_t 
mem_size,
 
     return *start + size;
 }
+
+void riscv_setup_rom_reset_vec(hwaddr start_addr, hwaddr rom_base,
+                               hwaddr rom_size, void *fdt)
+{
+    int i;
+    /* 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,
+        start_addr,                  /* start: .dword */
+        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),
+                          rom_base, &address_space_memory);
+
+    /* copy in the device tree */
+    if (fdt_pack(fdt) || fdt_totalsize(fdt) >
+        rom_size - sizeof(reset_vec)) {
+        error_report("not enough space to store device-tree");
+        exit(1);
+    }
+    qemu_fdt_dumpdtb(fdt, fdt_totalsize(fdt));
+    rom_add_blob_fixed_as("mrom.fdt", fdt, fdt_totalsize(fdt),
+                           rom_base + sizeof(reset_vec),
+                           &address_space_memory);
+
+    return;
+}
diff --git a/hw/riscv/spike.c b/hw/riscv/spike.c
index 3c87e04fdceb..561642c1fb5d 100644
--- a/hw/riscv/spike.c
+++ b/hw/riscv/spike.c
@@ -165,7 +165,6 @@ static void spike_board_init(MachineState *machine)
     MemoryRegion *system_memory = get_system_memory();
     MemoryRegion *main_mem = g_new(MemoryRegion, 1);
     MemoryRegion *mask_rom = g_new(MemoryRegion, 1);
-    int i;
     unsigned int smp_cpus = machine->smp.cpus;
 
     /* Initialize SOC */
@@ -212,40 +211,9 @@ static void spike_board_init(MachineState *machine)
         }
     }
 
-    /* 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);
+    /* load the reset vector */
+    riscv_setup_rom_reset_vec(memmap[SPIKE_DRAM].base, memmap[SPIKE_MROM].base,
+                              memmap[SPIKE_MROM].size, s->fdt);
 
     /* initialize HTIF using symbols found in load_kernel */
     htif_mm_init(system_memory, mask_rom, &s->soc.harts[0].env, serial_hd(0));
diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index 616db6f5aced..22a60259daab 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -535,40 +535,9 @@ static void virt_machine_init(MachineState *machine)
         start_addr = virt_memmap[VIRT_FLASH].base;
     }
 
-    /* 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,
-        start_addr,                  /* start: .dword */
-        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[VIRT_MROM].base, &address_space_memory);
-
-    /* copy in the device tree */
-    if (fdt_pack(s->fdt) || fdt_totalsize(s->fdt) >
-            memmap[VIRT_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[VIRT_MROM].base + sizeof(reset_vec),
-                          &address_space_memory);
+    /* load the reset vector */
+    riscv_setup_rom_reset_vec(start_addr, virt_memmap[VIRT_MROM].base,
+                              virt_memmap[VIRT_MROM].size, s->fdt);
 
     /* create PLIC hart topology configuration string */
     plic_hart_config_len = (strlen(VIRT_PLIC_HART_CONFIG) + 1) * smp_cpus;
diff --git a/include/hw/riscv/boot.h b/include/hw/riscv/boot.h
index 9daa98da08d7..3e9759c89aa2 100644
--- a/include/hw/riscv/boot.h
+++ b/include/hw/riscv/boot.h
@@ -35,5 +35,7 @@ target_ulong riscv_load_kernel(const char *kernel_filename,
                                symbol_fn_t sym_cb);
 hwaddr riscv_load_initrd(const char *filename, uint64_t mem_size,
                          uint64_t kernel_entry, hwaddr *start);
+void riscv_setup_rom_reset_vec(hwaddr saddr, hwaddr rom_base,
+                               hwaddr rom_size, void *fdt);
 
 #endif /* RISCV_BOOT_H */
-- 
2.26.2




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