Archipelago » qemu

/*

 * 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-file.h"

#include "qemu-common.h"

#include "sysemu/device_tree.h"

#include "hw/loader.h"

#include "elf.h"

#include "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(hwaddr 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, hwaddr 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) {

            hwaddr 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);

    }

}