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/*
* 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-option.h"
#include "qemu-config.h"
#include "qemu-common.h"
#include "device_tree.h"
#include "loader.h"
#include "elf.h"
#include "microblaze_boot.h"
static struct
{
void (*machine_cpu_reset)(MicroBlazeCPU *);
uint32_t bootstrap_pc;
uint32_t cmdline;
uint32_t fdt;
} boot_info;
static void main_cpu_reset(void *opaque)
{
MicroBlazeCPU *cpu = opaque;
CPUMBState *env = &cpu->env;
cpu_reset(CPU(cpu));
env->regs[5] = boot_info.cmdline;
env->regs[7] = boot_info.fdt;
env->sregs[SR_PC] = boot_info.bootstrap_pc;
if (boot_info.machine_cpu_reset) {
boot_info.machine_cpu_reset(cpu);
}
}
static int microblaze_load_dtb(target_phys_addr_t addr,
uint32_t ramsize,
const char *kernel_cmdline,
const char *dtb_filename)
{
int fdt_size;
#ifdef CONFIG_FDT
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_devtree_setprop_string(fdt, "/chosen", "bootargs",
kernel_cmdline);
if (r < 0) {
fprintf(stderr, "couldn't set /chosen/bootargs\n");
}
}
cpu_physical_memory_write(addr, (void *)fdt, fdt_size);
#else
/* We lack libfdt so we cannot manipulate the fdt. Just pass on the blob
to the kernel. */
if (dtb_filename) {
fdt_size = load_image_targphys(dtb_filename, addr, 0x10000);
}
if (kernel_cmdline) {
fprintf(stderr,
"Warning: missing libfdt, cannot pass cmdline to kernel!\n");
}
#endif
return fdt_size;
}
static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
{
return addr - 0x30000000LL;
}
void microblaze_load_kernel(MicroBlazeCPU *cpu, target_phys_addr_t ddr_base,
uint32_t ramsize, const char *dtb_filename,
void (*machine_cpu_reset)(MicroBlazeCPU *))
{
QemuOpts *machine_opts;
const char *kernel_filename = NULL;
const char *kernel_cmdline = NULL;
machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
if (machine_opts) {
const char *dtb_arg;
kernel_filename = qemu_opt_get(machine_opts, "kernel");
kernel_cmdline = qemu_opt_get(machine_opts, "append");
dtb_arg = qemu_opt_get(machine_opts, "dtb");
if (dtb_arg) { /* Preference a -dtb argument */
dtb_filename = dtb_arg;
} else { /* default to pcbios dtb as passed by machine_init */
dtb_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;
uint64_t entry, low, high;
uint32_t base32;
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,
&entry, &low, &high,
big_endian, ELF_MACHINE, 0);
base32 = entry;
if (base32 == 0xc0000000) {
kernel_size = load_elf(kernel_filename, translate_kernel_address,
NULL, &entry, NULL, NULL,
big_endian, ELF_MACHINE, 0);
}
/* Always boot into physical ram. */
boot_info.bootstrap_pc = ddr_base + (entry & 0x0fffffff);
/* If it wasn't an ELF image, try an u-boot image. */
if (kernel_size < 0) {
target_phys_addr_t uentry, loadaddr;
kernel_size = load_uimage(kernel_filename, &uentry, &loadaddr, 0);
boot_info.bootstrap_pc = uentry;
high = (loadaddr + kernel_size + 3) & ~3;
}
/* 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,
ram_size);
boot_info.bootstrap_pc = ddr_base;
high = (ddr_base + kernel_size + 3) & ~3;
}
boot_info.cmdline = high + 4096;
if (kernel_cmdline && strlen(kernel_cmdline)) {
pstrcpy_targphys("cmdline", boot_info.cmdline, 256, kernel_cmdline);
}
/* Provide a device-tree. */
boot_info.fdt = boot_info.cmdline + 4096;
microblaze_load_dtb(boot_info.fdt, ram_size, kernel_cmdline,
dtb_filename);
}
}
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