diff options
Diffstat (limited to 'hw/riscv/boot.c')
| -rw-r--r-- | hw/riscv/boot.c | 337 |
1 files changed, 259 insertions, 78 deletions
diff --git a/hw/riscv/boot.c b/hw/riscv/boot.c index 993bf89064..09878e722c 100644 --- a/hw/riscv/boot.c +++ b/hw/riscv/boot.c @@ -18,7 +18,6 @@ */ #include "qemu/osdep.h" -#include "qemu-common.h" #include "qemu/datadir.h" #include "qemu/units.h" #include "qemu/error-report.h" @@ -30,12 +29,42 @@ #include "elf.h" #include "sysemu/device_tree.h" #include "sysemu/qtest.h" +#include "sysemu/kvm.h" +#include "sysemu/reset.h" #include <libfdt.h> bool riscv_is_32bit(RISCVHartArrayState *harts) { - return riscv_cpu_is_32bit(&harts->harts[0].env); + RISCVCPUClass *mcc = RISCV_CPU_GET_CLASS(&harts->harts[0]); + return mcc->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, @@ -47,50 +76,30 @@ target_ulong riscv_calc_kernel_start_addr(RISCVHartArrayState *harts, } } -target_ulong riscv_find_and_load_firmware(MachineState *machine, - const char *default_machine_firmware, - hwaddr firmware_load_addr, - symbol_fn_t sym_cb) +const char *riscv_default_firmware_name(RISCVHartArrayState *harts) { - 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); + if (riscv_is_32bit(harts)) { + return RISCV32_BIOS_BIN; } - return firmware_end_addr; + return RISCV64_BIOS_BIN; } -char *riscv_find_firmware(const char *firmware_filename) +static char *riscv_find_bios(const char *bios_filename) { char *filename; - filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, firmware_filename); + filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_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, + * We only ship OpenSBI binary bios images in the QEMU source. + * For machines that use images other than 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); + error_report("Unable to find the RISC-V BIOS \"%s\"", + bios_filename); exit(1); } } @@ -98,11 +107,54 @@ char *riscv_find_firmware(const char *firmware_filename) return filename; } +char *riscv_find_firmware(const char *firmware_filename, + const char *default_machine_firmware) +{ + char *filename = NULL; + + if ((!firmware_filename) || (!strcmp(firmware_filename, "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. + */ + filename = riscv_find_bios(default_machine_firmware); + } else if (strcmp(firmware_filename, "none")) { + filename = riscv_find_bios(firmware_filename); + } + + return filename; +} + +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; + target_ulong firmware_end_addr = firmware_load_addr; + + firmware_filename = riscv_find_firmware(machine->firmware, + default_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; +} + 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; + uint64_t firmware_entry, firmware_end; + ssize_t firmware_size; + + g_assert(firmware_filename != NULL); if (load_elf_ram_sym(firmware_filename, NULL, NULL, NULL, &firmware_entry, NULL, &firmware_end, NULL, @@ -122,92 +174,172 @@ target_ulong riscv_load_firmware(const char *firmware_filename, exit(1); } -target_ulong riscv_load_kernel(const char *kernel_filename, +static void riscv_load_initrd(MachineState *machine, uint64_t kernel_entry) +{ + const char *filename = machine->initrd_filename; + uint64_t mem_size = machine->ram_size; + void *fdt = machine->fdt; + hwaddr start, end; + ssize_t size; + + g_assert(filename != NULL); + + /* + * 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 put the initrd at 512MB to allow large kernels + * to boot. + * So for boards with less than 1GB of RAM we put the initrd + * halfway into RAM, and for boards with 1GB of RAM or more we put + * the initrd at 512MB. + */ + start = kernel_entry + MIN(mem_size / 2, 512 * 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); + } + } + + /* Some RISC-V machines (e.g. opentitan) don't have a fdt. */ + if (fdt) { + end = start + size; + qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start", start); + qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end", end); + } +} + +target_ulong riscv_load_kernel(MachineState *machine, + RISCVHartArrayState *harts, target_ulong kernel_start_addr, + bool load_initrd, symbol_fn_t sym_cb) { - uint64_t kernel_entry; + const char *kernel_filename = machine->kernel_filename; + uint64_t kernel_load_base, kernel_entry; + void *fdt = machine->fdt; + + g_assert(kernel_filename != NULL); + /* + * 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, - &kernel_entry, NULL, NULL, NULL, 0, + NULL, &kernel_load_base, NULL, NULL, 0, EM_RISCV, 1, 0, NULL, true, sym_cb) > 0) { - return kernel_entry; + kernel_entry = kernel_load_base; + goto out; } if (load_uimage_as(kernel_filename, &kernel_entry, NULL, NULL, NULL, NULL, NULL) > 0) { - return kernel_entry; + goto out; } if (load_image_targphys_as(kernel_filename, kernel_start_addr, current_machine->ram_size, NULL) > 0) { - return kernel_start_addr; + kernel_entry = kernel_start_addr; + goto out; } 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; +out: /* - * 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. + * For 32 bit CPUs 'kernel_entry' can be sign-extended by + * load_elf_ram_sym(). */ - *start = kernel_entry + MIN(mem_size / 2, 128 * MiB); + if (riscv_is_32bit(harts)) { + kernel_entry = extract64(kernel_entry, 0, 32); + } - 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); - } + 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 *start + size; + return kernel_entry; } -uint32_t riscv_load_fdt(hwaddr dram_base, uint64_t mem_size, void *fdt) +/* + * This function makes an assumption that the DRAM interval + * 'dram_base' + 'dram_size' is contiguous. + * + * Considering that 'dram_end' is the lowest value between + * the end of the DRAM block and MachineState->ram_size, the + * FDT location will vary according to 'dram_base': + * + * - if 'dram_base' is less that 3072 MiB, the FDT will be + * put at the lowest value between 3072 MiB and 'dram_end'; + * + * - if 'dram_base' is higher than 3072 MiB, the FDT will be + * put at 'dram_end'. + * + * The FDT is fdt_packed() during the calculation. + */ +uint64_t riscv_compute_fdt_addr(hwaddr dram_base, hwaddr dram_size, + MachineState *ms) { - uint32_t temp, fdt_addr; - hwaddr dram_end = dram_base + mem_size; - int ret, fdtsize = fdt_totalsize(fdt); + int ret = fdt_pack(ms->fdt); + hwaddr dram_end, temp; + int fdtsize; + /* Should only fail if we've built a corrupted tree */ + g_assert(ret == 0); + + fdtsize = fdt_totalsize(ms->fdt); if (fdtsize <= 0) { error_report("invalid device-tree"); exit(1); } /* + * A dram_size == 0, usually from a MemMapEntry[].size element, + * means that the DRAM block goes all the way to ms->ram_size. + */ + dram_end = dram_base; + dram_end += dram_size ? MIN(ms->ram_size, dram_size) : ms->ram_size; + + /* * 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 + * Thus, put it at an 2MB 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); + temp = (dram_base < 3072 * MiB) ? MIN(dram_end, 3072 * MiB) : dram_end; + + return QEMU_ALIGN_DOWN(temp - fdtsize, 2 * MiB); +} + +/* + * 'fdt_addr' is received as hwaddr because boards might put + * the FDT beyond 32-bit addressing boundary. + */ +void riscv_load_fdt(hwaddr fdt_addr, void *fdt) +{ + uint32_t fdtsize = fdt_totalsize(fdt); - 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; + qemu_register_reset_nosnapshotload(qemu_fdt_randomize_seeds, + rom_ptr_for_as(&address_space_memory, fdt_addr, fdtsize)); } void riscv_rom_copy_firmware_info(MachineState *machine, hwaddr rom_base, @@ -251,13 +383,15 @@ 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) + uint64_t fdt_load_addr) { int i; uint32_t start_addr_hi32 = 0x00000000; + uint32_t fdt_load_addr_hi32 = 0x00000000; if (!riscv_is_32bit(harts)) { start_addr_hi32 = start_addr >> 32; + fdt_load_addr_hi32 = fdt_load_addr >> 32; } /* reset vector */ uint32_t reset_vec[10] = { @@ -270,7 +404,7 @@ void riscv_setup_rom_reset_vec(MachineState *machine, RISCVHartArrayState *harts start_addr, /* start: .dword */ start_addr_hi32, fdt_load_addr, /* fdt_laddr: .dword */ - 0x00000000, + fdt_load_addr_hi32, /* fw_dyn: */ }; if (riscv_is_32bit(harts)) { @@ -281,6 +415,15 @@ void riscv_setup_rom_reset_vec(MachineState *machine, RISCVHartArrayState *harts reset_vec[4] = 0x0182b283; /* ld t0, 24(t0) */ } + if (!harts->harts[0].cfg.ext_zicsr) { + /* + * The Zicsr extension has been disabled, so let's ensure we don't + * run the CSR instruction. Let's fill the address with a non + * compressed nop. + */ + reset_vec[2] = 0x00000013; /* addi x0, x0, 0 */ + } + /* 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]); @@ -289,6 +432,44 @@ void riscv_setup_rom_reset_vec(MachineState *machine, RISCVHartArrayState *harts rom_base, &address_space_memory); riscv_rom_copy_firmware_info(machine, rom_base, rom_size, sizeof(reset_vec), kernel_entry); +} + +void riscv_setup_direct_kernel(hwaddr kernel_addr, hwaddr fdt_addr) +{ + CPUState *cs; - return; + 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; + } +} + +void riscv_setup_firmware_boot(MachineState *machine) +{ + if (machine->kernel_filename) { + FWCfgState *fw_cfg; + fw_cfg = fw_cfg_find(); + + assert(fw_cfg); + /* + * Expose the kernel, the command line, and the initrd in fw_cfg. + * We don't process them here at all, it's all left to the + * firmware. + */ + load_image_to_fw_cfg(fw_cfg, + FW_CFG_KERNEL_SIZE, FW_CFG_KERNEL_DATA, + machine->kernel_filename, + true); + load_image_to_fw_cfg(fw_cfg, + FW_CFG_INITRD_SIZE, FW_CFG_INITRD_DATA, + machine->initrd_filename, false); + + if (machine->kernel_cmdline) { + fw_cfg_add_i32(fw_cfg, FW_CFG_CMDLINE_SIZE, + strlen(machine->kernel_cmdline) + 1); + fw_cfg_add_string(fw_cfg, FW_CFG_CMDLINE_DATA, + machine->kernel_cmdline); + } + } } |