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-rw-r--r--hw/riscv/boot.c53
-rw-r--r--hw/riscv/sifive_u.c28
-rw-r--r--hw/riscv/spike.c7
-rw-r--r--hw/riscv/virt.c7
4 files changed, 63 insertions, 32 deletions
diff --git a/hw/riscv/boot.c b/hw/riscv/boot.c
index 3df8023..c62f545 100644
--- a/hw/riscv/boot.c
+++ b/hw/riscv/boot.c
@@ -159,45 +159,68 @@ hwaddr riscv_load_initrd(const char *filename, uint64_t mem_size,
return *start + size;
}
+uint32_t riscv_load_fdt(hwaddr dram_base, uint64_t mem_size, void *fdt)
+{
+ uint32_t temp, fdt_addr;
+ hwaddr dram_end = dram_base + mem_size;
+ int fdtsize = fdt_totalsize(fdt);
+
+ if (fdtsize <= 0) {
+ error_report("invalid device-tree");
+ exit(1);
+ }
+
+ /*
+ * We should put fdt as far as possible to avoid kernel/initrd overwriting
+ * its content. But it should be addressable by 32 bit system as well.
+ * Thus, put it at an aligned address that less than fdt size from end of
+ * dram or 4GB whichever is lesser.
+ */
+ temp = MIN(dram_end, 4096 * MiB);
+ fdt_addr = QEMU_ALIGN_DOWN(temp - fdtsize, 2 * MiB);
+
+ fdt_pack(fdt);
+ /* copy in the device tree */
+ qemu_fdt_dumpdtb(fdt, fdtsize);
+
+ rom_add_blob_fixed_as("fdt", fdt, fdtsize, fdt_addr,
+ &address_space_memory);
+
+ return fdt_addr;
+}
+
void riscv_setup_rom_reset_vec(hwaddr start_addr, hwaddr rom_base,
- hwaddr rom_size, void *fdt)
+ hwaddr rom_size,
+ uint32_t fdt_load_addr, void *fdt)
{
int i;
/* reset vector */
- uint32_t reset_vec[8] = {
+ uint32_t reset_vec[10] = {
0x00000297, /* 1: auipc t0, %pcrel_hi(dtb) */
- 0x02028593, /* addi a1, t0, %pcrel_lo(1b) */
0xf1402573, /* csrr a0, mhartid */
#if defined(TARGET_RISCV32)
+ 0x0202a583, /* lw a1, 32(t0) */
0x0182a283, /* lw t0, 24(t0) */
#elif defined(TARGET_RISCV64)
+ 0x0202b583, /* ld a1, 32(t0) */
0x0182b283, /* ld t0, 24(t0) */
#endif
0x00028067, /* jr t0 */
0x00000000,
start_addr, /* start: .dword */
0x00000000,
+ fdt_load_addr, /* fdt_laddr: .dword */
+ 0x00000000,
/* dtb: */
};
/* copy in the reset vector in little_endian byte order */
- for (i = 0; i < sizeof(reset_vec) >> 2; i++) {
+ for (i = 0; i < ARRAY_SIZE(reset_vec); 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/sifive_u.c b/hw/riscv/sifive_u.c
index 0695c93..3992320 100644
--- a/hw/riscv/sifive_u.c
+++ b/hw/riscv/sifive_u.c
@@ -379,6 +379,7 @@ static void sifive_u_machine_init(MachineState *machine)
MemoryRegion *flash0 = g_new(MemoryRegion, 1);
target_ulong start_addr = memmap[SIFIVE_U_DRAM].base;
int i;
+ uint32_t fdt_load_addr;
/* Initialize SoC */
object_initialize_child(OBJECT(machine), "soc", &s->soc, TYPE_RISCV_U_SOC);
@@ -450,40 +451,37 @@ static void sifive_u_machine_init(MachineState *machine)
}
}
+ /* Compute the fdt load address in dram */
+ fdt_load_addr = riscv_load_fdt(memmap[SIFIVE_U_DRAM].base,
+ machine->ram_size, s->fdt);
+
/* reset vector */
- uint32_t reset_vec[8] = {
+ uint32_t reset_vec[11] = {
s->msel, /* MSEL pin state */
0x00000297, /* 1: auipc t0, %pcrel_hi(dtb) */
- 0x01c28593, /* addi a1, t0, %pcrel_lo(1b) */
0xf1402573, /* csrr a0, mhartid */
#if defined(TARGET_RISCV32)
+ 0x0202a583, /* lw a1, 32(t0) */
0x0182a283, /* lw t0, 24(t0) */
#elif defined(TARGET_RISCV64)
- 0x0182e283, /* lwu t0, 24(t0) */
+ 0x0202b583, /* ld a1, 32(t0) */
+ 0x0182b283, /* ld t0, 24(t0) */
#endif
0x00028067, /* jr t0 */
0x00000000,
start_addr, /* start: .dword */
+ 0x00000000,
+ fdt_load_addr, /* fdt_laddr: .dword */
+ 0x00000000,
/* dtb: */
};
/* copy in the reset vector in little_endian byte order */
- for (i = 0; i < sizeof(reset_vec) >> 2; i++) {
+ for (i = 0; i < ARRAY_SIZE(reset_vec); i++) {
reset_vec[i] = cpu_to_le32(reset_vec[i]);
}
rom_add_blob_fixed_as("mrom.reset", reset_vec, sizeof(reset_vec),
memmap[SIFIVE_U_MROM].base, &address_space_memory);
-
- /* copy in the device tree */
- if (fdt_pack(s->fdt) || fdt_totalsize(s->fdt) >
- memmap[SIFIVE_U_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[SIFIVE_U_MROM].base + sizeof(reset_vec),
- &address_space_memory);
}
static bool sifive_u_machine_get_start_in_flash(Object *obj, Error **errp)
diff --git a/hw/riscv/spike.c b/hw/riscv/spike.c
index a8a0588..13fa045 100644
--- a/hw/riscv/spike.c
+++ b/hw/riscv/spike.c
@@ -163,6 +163,7 @@ static void spike_board_init(MachineState *machine)
MemoryRegion *main_mem = g_new(MemoryRegion, 1);
MemoryRegion *mask_rom = g_new(MemoryRegion, 1);
unsigned int smp_cpus = machine->smp.cpus;
+ uint32_t fdt_load_addr;
/* Initialize SOC */
object_initialize_child(OBJECT(machine), "soc", &s->soc,
@@ -208,9 +209,13 @@ static void spike_board_init(MachineState *machine)
}
}
+ /* Compute the fdt load address in dram */
+ fdt_load_addr = riscv_load_fdt(memmap[SPIKE_DRAM].base,
+ machine->ram_size, s->fdt);
/* load the reset vector */
riscv_setup_rom_reset_vec(memmap[SPIKE_DRAM].base, memmap[SPIKE_MROM].base,
- memmap[SPIKE_MROM].size, s->fdt);
+ memmap[SPIKE_MROM].size,
+ fdt_load_addr, 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 3463cf5..9d87319 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -478,6 +478,7 @@ static void virt_machine_init(MachineState *machine)
char *plic_hart_config;
size_t plic_hart_config_len;
target_ulong start_addr = memmap[VIRT_DRAM].base;
+ uint32_t fdt_load_addr;
int i;
unsigned int smp_cpus = machine->smp.cpus;
@@ -532,9 +533,13 @@ static void virt_machine_init(MachineState *machine)
start_addr = virt_memmap[VIRT_FLASH].base;
}
+ /* Compute the fdt load address in dram */
+ fdt_load_addr = riscv_load_fdt(memmap[VIRT_DRAM].base,
+ machine->ram_size, s->fdt);
/* load the reset vector */
riscv_setup_rom_reset_vec(start_addr, virt_memmap[VIRT_MROM].base,
- virt_memmap[VIRT_MROM].size, s->fdt);
+ virt_memmap[VIRT_MROM].size,
+ fdt_load_addr, s->fdt);
/* create PLIC hart topology configuration string */
plic_hart_config_len = (strlen(VIRT_PLIC_HART_CONFIG) + 1) * smp_cpus;
generated by cgit v1.1 at 2024-09-06 10:25:16 +0000