hw/riscv/boot.c: consolidate all kernel init in riscv_load_kernel()

The microchip_icicle_kit, sifive_u, spike and virt boards are now doing
the same steps when '-kernel' is used:

- execute load_kernel()
- load init_rd()
- write kernel_cmdline

Let's fold everything inside riscv_load_kernel() to avoid code
repetition. To not change the behavior of boards that aren't calling
riscv_load_init(), add an 'load_initrd' flag to riscv_load_kernel() and
allow these boards to opt out from initrd loading.

Cc: Palmer Dabbelt <palmer@dabbelt.com>
Reviewed-by: Bin Meng <bmeng@tinylab.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230206140022.2748401-3-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

hw/riscv/boot.c

@@ -176,10 +176,12 @@ target_ulong riscv_load_firmware(const char *firmware_filename,
 target_ulong riscv_load_kernel(MachineState *machine,
                                RISCVHartArrayState *harts,
                                target_ulong kernel_start_addr,
+                               bool load_initrd,
                                symbol_fn_t sym_cb)
 {
     const char *kernel_filename = machine->kernel_filename;
     uint64_t kernel_load_base, kernel_entry;
+    void *fdt = machine->fdt;
 
     g_assert(kernel_filename != NULL);
 
@@ -220,6 +222,15 @@ out:
         kernel_entry = extract64(kernel_entry, 0, 32);
     }
 
+    if (load_initrd && machine->initrd_filename) {
+        riscv_load_initrd(machine, kernel_entry);
+    }
+
+    if (fdt && machine->kernel_cmdline && *machine->kernel_cmdline) {
+        qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
+                                machine->kernel_cmdline);
+    }
+
     return kernel_entry;
 }
 

hw/riscv/microchip_pfsoc.c

@@ -630,16 +630,7 @@ static void microchip_icicle_kit_machine_init(MachineState *machine)
                                                          firmware_end_addr);
 
         kernel_entry = riscv_load_kernel(machine, &s->soc.u_cpus,
-                                         kernel_start_addr, NULL);
-
-        if (machine->initrd_filename) {
-            riscv_load_initrd(machine, kernel_entry);
-        }
-
-        if (machine->kernel_cmdline && *machine->kernel_cmdline) {
-            qemu_fdt_setprop_string(machine->fdt, "/chosen",
-                                    "bootargs", machine->kernel_cmdline);
-        }
+                                         kernel_start_addr, true, NULL);
 
         /* Compute the fdt load address in dram */
         fdt_load_addr = riscv_compute_fdt_addr(memmap[MICROCHIP_PFSOC_DRAM_LO].base,

hw/riscv/opentitan.c

@@ -102,7 +102,8 @@ static void opentitan_board_init(MachineState *machine)
 
     if (machine->kernel_filename) {
         riscv_load_kernel(machine, &s->soc.cpus,
-                          memmap[IBEX_DEV_RAM].base, NULL);
+                          memmap[IBEX_DEV_RAM].base,
+                          false, NULL);
     }
 }
 

hw/riscv/sifive_e.c

@@ -115,7 +115,8 @@ static void sifive_e_machine_init(MachineState *machine)
 
     if (machine->kernel_filename) {
         riscv_load_kernel(machine, &s->soc.cpus,
-                          memmap[SIFIVE_E_DEV_DTIM].base, NULL);
+                          memmap[SIFIVE_E_DEV_DTIM].base,
+                          false, NULL);
     }
 }
 

hw/riscv/sifive_u.c

@@ -599,16 +599,7 @@ static void sifive_u_machine_init(MachineState *machine)
                                                          firmware_end_addr);
 
         kernel_entry = riscv_load_kernel(machine, &s->soc.u_cpus,
-                                         kernel_start_addr, NULL);
-
-        if (machine->initrd_filename) {
-            riscv_load_initrd(machine, kernel_entry);
-        }
-
-        if (machine->kernel_cmdline && *machine->kernel_cmdline) {
-            qemu_fdt_setprop_string(machine->fdt, "/chosen", "bootargs",
-                                    machine->kernel_cmdline);
-        }
+                                         kernel_start_addr, true, NULL);
     } else {
        /*
         * If dynamic firmware is used, it doesn't know where is the next mode

hw/riscv/spike.c

@@ -307,16 +307,7 @@ static void spike_board_init(MachineState *machine)
 
         kernel_entry = riscv_load_kernel(machine, &s->soc[0],
                                          kernel_start_addr,
-                                         htif_symbol_callback);
-
-        if (machine->initrd_filename) {
-            riscv_load_initrd(machine, kernel_entry);
-        }
-
-        if (machine->kernel_cmdline && *machine->kernel_cmdline) {
-            qemu_fdt_setprop_string(machine->fdt, "/chosen", "bootargs",
-                                    machine->kernel_cmdline);
-        }
+                                         true, htif_symbol_callback);
     } else {
        /*
         * If dynamic firmware is used, it doesn't know where is the next mode

hw/riscv/virt.c

@@ -1278,16 +1278,7 @@ static void virt_machine_done(Notifier *notifier, void *data)
                                                          firmware_end_addr);
 
         kernel_entry = riscv_load_kernel(machine, &s->soc[0],
-                                         kernel_start_addr, NULL);
-
-        if (machine->initrd_filename) {
-            riscv_load_initrd(machine, kernel_entry);
-        }
-
-        if (machine->kernel_cmdline && *machine->kernel_cmdline) {
-            qemu_fdt_setprop_string(machine->fdt, "/chosen", "bootargs",
-                                    machine->kernel_cmdline);
-        }
+                                         kernel_start_addr, true, NULL);
     } else {
        /*
         * If dynamic firmware is used, it doesn't know where is the next mode

include/hw/riscv/boot.h

@@ -46,6 +46,7 @@ target_ulong riscv_load_firmware(const char *firmware_filename,
 target_ulong riscv_load_kernel(MachineState *machine,
                                RISCVHartArrayState *harts,
                                target_ulong firmware_end_addr,
+                               bool load_initrd,
                                symbol_fn_t sym_cb);
 void riscv_load_initrd(MachineState *machine, uint64_t kernel_entry);
 uint64_t riscv_compute_fdt_addr(hwaddr dram_start, uint64_t dram_size,