| /* |
| * QEMU RISC-V Boot Helper |
| * |
| * Copyright (c) 2017 SiFive, Inc. |
| * Copyright (c) 2019 Alistair Francis <alistair.francis@wdc.com> |
| * |
| * 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-common.h" |
| #include "qemu/datadir.h" |
| #include "qemu/units.h" |
| #include "qemu/error-report.h" |
| #include "exec/cpu-defs.h" |
| #include "hw/boards.h" |
| #include "hw/loader.h" |
| #include "hw/riscv/boot.h" |
| #include "hw/riscv/boot_opensbi.h" |
| #include "elf.h" |
| #include "sysemu/device_tree.h" |
| #include "sysemu/qtest.h" |
| #include "sysemu/kvm.h" |
| |
| #include <libfdt.h> |
| |
| bool riscv_is_32bit(RISCVHartArrayState *harts) |
| { |
| return harts->harts[0].env.misa_mxl_max == MXL_RV32; |
| } |
| |
| /* |
| * Return the per-socket PLIC hart topology configuration string |
| * (caller must free with g_free()) |
| */ |
| char *riscv_plic_hart_config_string(int hart_count) |
| { |
| g_autofree const char **vals = g_new(const char *, hart_count + 1); |
| int i; |
| |
| for (i = 0; i < hart_count; i++) { |
| CPUState *cs = qemu_get_cpu(i); |
| CPURISCVState *env = &RISCV_CPU(cs)->env; |
| |
| if (kvm_enabled()) { |
| vals[i] = "S"; |
| } else if (riscv_has_ext(env, RVS)) { |
| vals[i] = "MS"; |
| } else { |
| vals[i] = "M"; |
| } |
| } |
| vals[i] = NULL; |
| |
| /* g_strjoinv() obliges us to cast away const here */ |
| return g_strjoinv(",", (char **)vals); |
| } |
| |
| target_ulong riscv_calc_kernel_start_addr(RISCVHartArrayState *harts, |
| target_ulong firmware_end_addr) { |
| if (riscv_is_32bit(harts)) { |
| return QEMU_ALIGN_UP(firmware_end_addr, 4 * MiB); |
| } else { |
| return QEMU_ALIGN_UP(firmware_end_addr, 2 * MiB); |
| } |
| } |
| |
| target_ulong riscv_find_and_load_firmware(MachineState *machine, |
| const char *default_machine_firmware, |
| hwaddr firmware_load_addr, |
| symbol_fn_t sym_cb) |
| { |
| char *firmware_filename = NULL; |
| target_ulong firmware_end_addr = firmware_load_addr; |
| |
| if ((!machine->firmware) || (!strcmp(machine->firmware, "default"))) { |
| /* |
| * The user didn't specify -bios, or has specified "-bios default". |
| * That means we are going to load the OpenSBI binary included in |
| * the QEMU source. |
| */ |
| firmware_filename = riscv_find_firmware(default_machine_firmware); |
| } else if (strcmp(machine->firmware, "none")) { |
| firmware_filename = riscv_find_firmware(machine->firmware); |
| } |
| |
| if (firmware_filename) { |
| /* If not "none" load the firmware */ |
| firmware_end_addr = riscv_load_firmware(firmware_filename, |
| firmware_load_addr, sym_cb); |
| g_free(firmware_filename); |
| } |
| |
| return firmware_end_addr; |
| } |
| |
| char *riscv_find_firmware(const char *firmware_filename) |
| { |
| char *filename; |
| |
| filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, firmware_filename); |
| if (filename == NULL) { |
| if (!qtest_enabled()) { |
| /* |
| * We only ship plain binary bios images in the QEMU source. |
| * With Spike machine that uses ELF images as the default bios, |
| * running QEMU test will complain hence let's suppress the error |
| * report for QEMU testing. |
| */ |
| error_report("Unable to load the RISC-V firmware \"%s\"", |
| firmware_filename); |
| exit(1); |
| } |
| } |
| |
| return filename; |
| } |
| |
| target_ulong riscv_load_firmware(const char *firmware_filename, |
| hwaddr firmware_load_addr, |
| symbol_fn_t sym_cb) |
| { |
| uint64_t firmware_entry, firmware_size, firmware_end; |
| |
| if (load_elf_ram_sym(firmware_filename, NULL, NULL, NULL, |
| &firmware_entry, NULL, &firmware_end, NULL, |
| 0, EM_RISCV, 1, 0, NULL, true, sym_cb) > 0) { |
| return firmware_end; |
| } |
| |
| firmware_size = load_image_targphys_as(firmware_filename, |
| firmware_load_addr, |
| current_machine->ram_size, NULL); |
| |
| if (firmware_size > 0) { |
| return firmware_load_addr + firmware_size; |
| } |
| |
| error_report("could not load firmware '%s'", firmware_filename); |
| exit(1); |
| } |
| |
| target_ulong riscv_load_kernel(const char *kernel_filename, |
| target_ulong kernel_start_addr, |
| symbol_fn_t sym_cb) |
| { |
| uint64_t kernel_load_base, kernel_entry; |
| |
| /* |
| * NB: Use low address not ELF entry point to ensure that the fw_dynamic |
| * behaviour when loading an ELF matches the fw_payload, fw_jump and BBL |
| * behaviour, as well as fw_dynamic with a raw binary, all of which jump to |
| * the (expected) load address load address. This allows kernels to have |
| * separate SBI and ELF entry points (used by FreeBSD, for example). |
| */ |
| if (load_elf_ram_sym(kernel_filename, NULL, NULL, NULL, |
| NULL, &kernel_load_base, NULL, NULL, 0, |
| EM_RISCV, 1, 0, NULL, true, sym_cb) > 0) { |
| return kernel_load_base; |
| } |
| |
| if (load_uimage_as(kernel_filename, &kernel_entry, NULL, NULL, |
| NULL, NULL, NULL) > 0) { |
| return kernel_entry; |
| } |
| |
| if (load_image_targphys_as(kernel_filename, kernel_start_addr, |
| current_machine->ram_size, NULL) > 0) { |
| return kernel_start_addr; |
| } |
| |
| error_report("could not load kernel '%s'", kernel_filename); |
| exit(1); |
| } |
| |
| hwaddr riscv_load_initrd(const char *filename, uint64_t mem_size, |
| uint64_t kernel_entry, hwaddr *start) |
| { |
| int size; |
| |
| /* |
| * We want to put the initrd far enough into RAM that when the |
| * kernel is uncompressed it will not clobber the initrd. However |
| * on boards without much RAM we must ensure that we still leave |
| * enough room for a decent sized initrd, and on boards with large |
| * amounts of RAM we must avoid the initrd being so far up in RAM |
| * that it is outside lowmem and inaccessible to the kernel. |
| * So for boards with less than 256MB of RAM we put the initrd |
| * halfway into RAM, and for boards with 256MB of RAM or more we put |
| * the initrd at 128MB. |
| */ |
| *start = kernel_entry + MIN(mem_size / 2, 128 * MiB); |
| |
| size = load_ramdisk(filename, *start, mem_size - *start); |
| if (size == -1) { |
| size = load_image_targphys(filename, *start, mem_size - *start); |
| if (size == -1) { |
| error_report("could not load ramdisk '%s'", filename); |
| exit(1); |
| } |
| } |
| |
| 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 ret, 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 16MB aligned address that less than fdt size from the |
| * end of dram or 3GB whichever is lesser. |
| */ |
| temp = MIN(dram_end, 3072 * MiB); |
| fdt_addr = QEMU_ALIGN_DOWN(temp - fdtsize, 16 * MiB); |
| |
| ret = fdt_pack(fdt); |
| /* Should only fail if we've built a corrupted tree */ |
| g_assert(ret == 0); |
| /* 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_rom_copy_firmware_info(MachineState *machine, hwaddr rom_base, |
| hwaddr rom_size, uint32_t reset_vec_size, |
| uint64_t kernel_entry) |
| { |
| struct fw_dynamic_info dinfo; |
| size_t dinfo_len; |
| |
| if (sizeof(dinfo.magic) == 4) { |
| dinfo.magic = cpu_to_le32(FW_DYNAMIC_INFO_MAGIC_VALUE); |
| dinfo.version = cpu_to_le32(FW_DYNAMIC_INFO_VERSION); |
| dinfo.next_mode = cpu_to_le32(FW_DYNAMIC_INFO_NEXT_MODE_S); |
| dinfo.next_addr = cpu_to_le32(kernel_entry); |
| } else { |
| dinfo.magic = cpu_to_le64(FW_DYNAMIC_INFO_MAGIC_VALUE); |
| dinfo.version = cpu_to_le64(FW_DYNAMIC_INFO_VERSION); |
| dinfo.next_mode = cpu_to_le64(FW_DYNAMIC_INFO_NEXT_MODE_S); |
| dinfo.next_addr = cpu_to_le64(kernel_entry); |
| } |
| dinfo.options = 0; |
| dinfo.boot_hart = 0; |
| dinfo_len = sizeof(dinfo); |
| |
| /** |
| * copy the dynamic firmware info. This information is specific to |
| * OpenSBI but doesn't break any other firmware as long as they don't |
| * expect any certain value in "a2" register. |
| */ |
| if (dinfo_len > (rom_size - reset_vec_size)) { |
| error_report("not enough space to store dynamic firmware info"); |
| exit(1); |
| } |
| |
| rom_add_blob_fixed_as("mrom.finfo", &dinfo, dinfo_len, |
| rom_base + reset_vec_size, |
| &address_space_memory); |
| } |
| |
| void riscv_setup_rom_reset_vec(MachineState *machine, RISCVHartArrayState *harts, |
| hwaddr start_addr, |
| hwaddr rom_base, hwaddr rom_size, |
| uint64_t kernel_entry, |
| uint32_t fdt_load_addr, void *fdt) |
| { |
| int i; |
| uint32_t start_addr_hi32 = 0x00000000; |
| |
| if (!riscv_is_32bit(harts)) { |
| start_addr_hi32 = start_addr >> 32; |
| } |
| /* reset vector */ |
| uint32_t reset_vec[10] = { |
| 0x00000297, /* 1: auipc t0, %pcrel_hi(fw_dyn) */ |
| 0x02828613, /* addi a2, t0, %pcrel_lo(1b) */ |
| 0xf1402573, /* csrr a0, mhartid */ |
| 0, |
| 0, |
| 0x00028067, /* jr t0 */ |
| start_addr, /* start: .dword */ |
| start_addr_hi32, |
| fdt_load_addr, /* fdt_laddr: .dword */ |
| 0x00000000, |
| /* fw_dyn: */ |
| }; |
| if (riscv_is_32bit(harts)) { |
| reset_vec[3] = 0x0202a583; /* lw a1, 32(t0) */ |
| reset_vec[4] = 0x0182a283; /* lw t0, 24(t0) */ |
| } else { |
| reset_vec[3] = 0x0202b583; /* ld a1, 32(t0) */ |
| reset_vec[4] = 0x0182b283; /* ld t0, 24(t0) */ |
| } |
| |
| /* copy in the reset vector in little_endian byte order */ |
| 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); |
| riscv_rom_copy_firmware_info(machine, rom_base, rom_size, sizeof(reset_vec), |
| kernel_entry); |
| |
| return; |
| } |
| |
| void riscv_setup_direct_kernel(hwaddr kernel_addr, hwaddr fdt_addr) |
| { |
| CPUState *cs; |
| |
| for (cs = first_cpu; cs; cs = CPU_NEXT(cs)) { |
| RISCVCPU *riscv_cpu = RISCV_CPU(cs); |
| riscv_cpu->env.kernel_addr = kernel_addr; |
| riscv_cpu->env.fdt_addr = fdt_addr; |
| } |
| } |
