This patch adds support for a generic MMU-less Nios II board that can be used e.g. for bare-metal compiler testing with the linker script and startup code provided by libgloss. Nios II booting is also tweaked so that bare-metal binaries start executing in RAM starting at 0x00000000, rather than an alias at 0xc0000000, which allows features such as unwinding to work when binaries are linked to start at the beginning of the address space. The generic_nommu.c parts are based on code by Andrew Jenner, which was in turn based on code by Marek Vasut. Originally by Marek Vasut and Andrew Jenner. Signed-off-by: Sandra Loosemore <sandra@codesourcery.com> Signed-off-by: Julian Brown <julian@codesourcery.com> Signed-off-by: Andrew Jenner <andrew@codesourcery.com> Signed-off-by: Marek Vasut <marex@denx.de> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1554321185-2825-2-git-send-email-sandra@codesourcery.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
230 lines
7.8 KiB
C
230 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-common.h"
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#include "cpu.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/sysemu.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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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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QemuOpts *machine_opts;
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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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machine_opts = qemu_get_machine_opts();
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kernel_filename = qemu_opt_get(machine_opts, "kernel");
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kernel_cmdline = qemu_opt_get(machine_opts, "append");
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dtb_arg = qemu_opt_get(machine_opts, "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, low, high;
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int big_endian = 0;
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#ifdef TARGET_WORDS_BIGENDIAN
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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, &low, &high,
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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,
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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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ram_size);
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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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ram_size - 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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ram_size - 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, ram_size, 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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