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