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/*
* 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/datadir.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#include "qemu/guest-random.h"
#include "sysemu/device_tree.h"
#include "sysemu/reset.h"
#include "hw/boards.h"
#include "hw/loader.h"
#include "elf.h"
#include "boot.h"
#include <libfdt.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)
{
MachineState *machine = MACHINE(qdev_get_machine());
int fdt_size;
void *fdt = NULL;
int r;
uint8_t rng_seed[32];
if (dtb_filename) {
fdt = load_device_tree(dtb_filename, &fdt_size);
}
if (!fdt) {
return 0;
}
qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
qemu_fdt_setprop(fdt, "/chosen", "rng-seed", rng_seed, sizeof(rng_seed));
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);
/* Set machine->fdt for 'dumpdtb' QMP/HMP command */
machine->fdt = 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;
#if TARGET_BIG_ENDIAN
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);
}
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