diff options
Diffstat (limited to 'hw/nios2/boot.c')
| -rw-r--r-- | hw/nios2/boot.c | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/hw/nios2/boot.c b/hw/nios2/boot.c new file mode 100644 index 000000000..5b3e4efed --- /dev/null +++ b/hw/nios2/boot.c @@ -0,0 +1,229 @@ +/* + * Nios2 kernel loader + * + * Copyright (c) 2016 Marek Vasut <marek.vasut@gmail.com> + * + * Based on microblaze kernel loader + * + * Copyright (c) 2012 Peter Crosthwaite <peter.crosthwaite@petalogix.com> + * Copyright (c) 2012 PetaLogix + * Copyright (c) 2009 Edgar E. Iglesias. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "qemu/osdep.h" +#include "qemu/units.h" +#include "qemu-common.h" +#include "qemu/datadir.h" +#include "qemu/option.h" +#include "qemu/config-file.h" +#include "qemu/error-report.h" +#include "sysemu/device_tree.h" +#include "sysemu/reset.h" +#include "hw/boards.h" +#include "hw/loader.h" +#include "elf.h" + +#include "boot.h" + +#define NIOS2_MAGIC 0x534f494e + +static struct nios2_boot_info { + void (*machine_cpu_reset)(Nios2CPU *); + uint32_t bootstrap_pc; + uint32_t cmdline; + uint32_t initrd_start; + uint32_t initrd_end; + uint32_t fdt; +} boot_info; + +static void main_cpu_reset(void *opaque) +{ + Nios2CPU *cpu = opaque; + CPUState *cs = CPU(cpu); + CPUNios2State *env = &cpu->env; + + cpu_reset(CPU(cpu)); + + env->regs[R_ARG0] = NIOS2_MAGIC; + env->regs[R_ARG1] = boot_info.initrd_start; + env->regs[R_ARG2] = boot_info.fdt; + env->regs[R_ARG3] = boot_info.cmdline; + + cpu_set_pc(cs, boot_info.bootstrap_pc); + if (boot_info.machine_cpu_reset) { + boot_info.machine_cpu_reset(cpu); + } +} + +static uint64_t translate_kernel_address(void *opaque, uint64_t addr) +{ + return addr - 0xc0000000LL; +} + +static int nios2_load_dtb(struct nios2_boot_info bi, const uint32_t ramsize, + const char *kernel_cmdline, const char *dtb_filename) +{ + int fdt_size; + void *fdt = NULL; + int r; + + if (dtb_filename) { + fdt = load_device_tree(dtb_filename, &fdt_size); + } + if (!fdt) { + return 0; + } + + if (kernel_cmdline) { + r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", + kernel_cmdline); + if (r < 0) { + fprintf(stderr, "couldn't set /chosen/bootargs\n"); + } + } + + if (bi.initrd_start) { + qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start", + translate_kernel_address(NULL, bi.initrd_start)); + + qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end", + translate_kernel_address(NULL, bi.initrd_end)); + } + + cpu_physical_memory_write(bi.fdt, fdt, fdt_size); + g_free(fdt); + return fdt_size; +} + +void nios2_load_kernel(Nios2CPU *cpu, hwaddr ddr_base, + uint32_t ramsize, + const char *initrd_filename, + const char *dtb_filename, + void (*machine_cpu_reset)(Nios2CPU *)) +{ + const char *kernel_filename; + const char *kernel_cmdline; + const char *dtb_arg; + char *filename = NULL; + + kernel_filename = current_machine->kernel_filename; + kernel_cmdline = current_machine->kernel_cmdline; + dtb_arg = current_machine->dtb; + /* default to pcbios dtb as passed by machine_init */ + if (!dtb_arg) { + filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_filename); + } + + boot_info.machine_cpu_reset = machine_cpu_reset; + qemu_register_reset(main_cpu_reset, cpu); + + if (kernel_filename) { + int kernel_size, fdt_size; + uint64_t entry, high; + int big_endian = 0; + +#ifdef TARGET_WORDS_BIGENDIAN + big_endian = 1; +#endif + + /* Boots a kernel elf binary. */ + kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, + &entry, NULL, &high, NULL, + big_endian, EM_ALTERA_NIOS2, 0, 0); + if ((uint32_t)entry == 0xc0000000) { + /* + * The Nios II processor reference guide documents that the + * kernel is placed at virtual memory address 0xc0000000, + * and we've got something that points there. Reload it + * and adjust the entry to get the address in physical RAM. + */ + kernel_size = load_elf(kernel_filename, NULL, + translate_kernel_address, NULL, + &entry, NULL, NULL, NULL, + big_endian, EM_ALTERA_NIOS2, 0, 0); + boot_info.bootstrap_pc = ddr_base + 0xc0000000 + + (entry & 0x07ffffff); + } else { + /* Use the entry point in the ELF image. */ + boot_info.bootstrap_pc = (uint32_t)entry; + } + + /* If it wasn't an ELF image, try an u-boot image. */ + if (kernel_size < 0) { + hwaddr uentry, loadaddr = LOAD_UIMAGE_LOADADDR_INVALID; + + kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0, + NULL, NULL); + boot_info.bootstrap_pc = uentry; + high = loadaddr + kernel_size; + } + + /* Not an ELF image nor an u-boot image, try a RAW image. */ + if (kernel_size < 0) { + kernel_size = load_image_targphys(kernel_filename, ddr_base, + ramsize); + boot_info.bootstrap_pc = ddr_base; + high = ddr_base + kernel_size; + } + + high = ROUND_UP(high, 1 * MiB); + + /* If initrd is available, it goes after the kernel, aligned to 1M. */ + if (initrd_filename) { + int initrd_size; + uint32_t initrd_offset; + + boot_info.initrd_start = high; + initrd_offset = boot_info.initrd_start - ddr_base; + + initrd_size = load_ramdisk(initrd_filename, + boot_info.initrd_start, + ramsize - initrd_offset); + if (initrd_size < 0) { + initrd_size = load_image_targphys(initrd_filename, + boot_info.initrd_start, + ramsize - initrd_offset); + } + if (initrd_size < 0) { + error_report("could not load initrd '%s'", + initrd_filename); + exit(EXIT_FAILURE); + } + high += initrd_size; + } + high = ROUND_UP(high, 4); + boot_info.initrd_end = high; + + /* Device tree must be placed right after initrd (if available) */ + boot_info.fdt = high; + fdt_size = nios2_load_dtb(boot_info, ramsize, kernel_cmdline, + /* Preference a -dtb argument */ + dtb_arg ? dtb_arg : filename); + high += fdt_size; + + /* Kernel command is at the end, 4k aligned. */ + boot_info.cmdline = ROUND_UP(high, 4 * KiB); + if (kernel_cmdline && strlen(kernel_cmdline)) { + pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline); + } + } + g_free(filename); +} |