Archipelago » qemu

/*

 * ARM kernel loader.

 *

 * Copyright (c) 2006-2007 CodeSourcery.

 * Written by Paul Brook

 *

 * This code is licenced under the GPL.

 */

#include "hw.h"

#include "arm-misc.h"

#include "sysemu.h"

#include "loader.h"

#include "elf.h"

#define KERNEL_ARGS_ADDR 0x100

#define KERNEL_LOAD_ADDR 0x00010000

#define INITRD_LOAD_ADDR 0x00800000

/* The worlds second smallest bootloader.  Set r0-r2, then jump to kernel.  */

static uint32_t bootloader[] = {

  0xe3a00000, /* mov     r0, #0 */

  0xe3a01000, /* mov     r1, #0x?? */

  0xe3811c00, /* orr     r1, r1, #0x??00 */

  0xe59f2000, /* ldr     r2, [pc, #0] */

  0xe59ff000, /* ldr     pc, [pc, #0] */

  0, /* Address of kernel args.  Set by integratorcp_init.  */

  0  /* Kernel entry point.  Set by integratorcp_init.  */

};

/* Entry point for secondary CPUs.  Enable interrupt controller and

   Issue WFI until start address is written to system controller.  */

static uint32_t smpboot[] = {

  0xe3a00201, /* mov     r0, #0x10000000 */

  0xe3800601, /* orr     r0, r0, #0x001000000 */

  0xe3a01001, /* mov     r1, #1 */

  0xe5801100, /* str     r1, [r0, #0x100] */

  0xe3a00201, /* mov     r0, #0x10000000 */

  0xe3800030, /* orr     r0, #0x30 */

  0xe320f003, /* wfi */

  0xe5901000, /* ldr     r1, [r0] */

  0xe3110003, /* tst     r1, #3 */

  0x1afffffb, /* bne     <wfi> */

  0xe12fff11  /* bx      r1 */

};

static void main_cpu_reset(void *opaque)

{

    CPUState *env = opaque;

    cpu_reset(env);

    if (env->boot_info)

        arm_load_kernel(env, env->boot_info);

    /* TODO:  Reset secondary CPUs.  */

}

#define WRITE_WORD(p, value) do { \

    stl_phys_notdirty(p, value);  \

    p += 4;                       \

} while (0)

static void set_kernel_args(struct arm_boot_info *info,

                int initrd_size, a_target_phys_addr base)

{

    a_target_phys_addr p;

    p = base + KERNEL_ARGS_ADDR;

    /* ATAG_CORE */

    WRITE_WORD(p, 5);

    WRITE_WORD(p, 0x54410001);

    WRITE_WORD(p, 1);

    WRITE_WORD(p, 0x1000);

    WRITE_WORD(p, 0);

    /* ATAG_MEM */

    /* TODO: handle multiple chips on one ATAG list */

    WRITE_WORD(p, 4);

    WRITE_WORD(p, 0x54410002);

    WRITE_WORD(p, info->ram_size);

    WRITE_WORD(p, info->loader_start);

    if (initrd_size) {

        /* ATAG_INITRD2 */

        WRITE_WORD(p, 4);

        WRITE_WORD(p, 0x54420005);

        WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);

        WRITE_WORD(p, initrd_size);

    }

    if (info->kernel_cmdline && *info->kernel_cmdline) {

        /* ATAG_CMDLINE */

        int cmdline_size;

        cmdline_size = strlen(info->kernel_cmdline);

        cpu_physical_memory_write(p + 8, (void *)info->kernel_cmdline,

                                  cmdline_size + 1);

        cmdline_size = (cmdline_size >> 2) + 1;

        WRITE_WORD(p, cmdline_size + 2);

        WRITE_WORD(p, 0x54410009);

        p += cmdline_size * 4;

    }

    if (info->atag_board) {

        /* ATAG_BOARD */

        int atag_board_len;

        uint8_t atag_board_buf[0x1000];

        atag_board_len = (info->atag_board(info, atag_board_buf) + 3) & ~3;

        WRITE_WORD(p, (atag_board_len + 8) >> 2);

        WRITE_WORD(p, 0x414f4d50);

        cpu_physical_memory_write(p, atag_board_buf, atag_board_len);

        p += atag_board_len;

    }

    /* ATAG_END */

    WRITE_WORD(p, 0);

    WRITE_WORD(p, 0);

}

static void set_kernel_args_old(struct arm_boot_info *info,

                int initrd_size, a_target_phys_addr base)

{

    a_target_phys_addr p;

    const char *s;

    /* see linux/include/asm-arm/setup.h */

    p = base + KERNEL_ARGS_ADDR;

    /* page_size */

    WRITE_WORD(p, 4096);

    /* nr_pages */

    WRITE_WORD(p, info->ram_size / 4096);

    /* ramdisk_size */

    WRITE_WORD(p, 0);

#define FLAG_READONLY        1

#define FLAG_RDLOAD        4

#define FLAG_RDPROMPT        8

    /* flags */

    WRITE_WORD(p, FLAG_READONLY | FLAG_RDLOAD | FLAG_RDPROMPT);

    /* rootdev */

    WRITE_WORD(p, (31 << 8) | 0);        /* /dev/mtdblock0 */

    /* video_num_cols */

    WRITE_WORD(p, 0);

    /* video_num_rows */

    WRITE_WORD(p, 0);

    /* video_x */

    WRITE_WORD(p, 0);

    /* video_y */

    WRITE_WORD(p, 0);

    /* memc_control_reg */

    WRITE_WORD(p, 0);

    /* unsigned char sounddefault */

    /* unsigned char adfsdrives */

    /* unsigned char bytes_per_char_h */

    /* unsigned char bytes_per_char_v */

    WRITE_WORD(p, 0);

    /* pages_in_bank[4] */

    WRITE_WORD(p, 0);

    WRITE_WORD(p, 0);

    WRITE_WORD(p, 0);

    WRITE_WORD(p, 0);

    /* pages_in_vram */

    WRITE_WORD(p, 0);

    /* initrd_start */

    if (initrd_size)

        WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);

    else

        WRITE_WORD(p, 0);

    /* initrd_size */

    WRITE_WORD(p, initrd_size);

    /* rd_start */

    WRITE_WORD(p, 0);

    /* system_rev */

    WRITE_WORD(p, 0);

    /* system_serial_low */

    WRITE_WORD(p, 0);

    /* system_serial_high */

    WRITE_WORD(p, 0);

    /* mem_fclk_21285 */

    WRITE_WORD(p, 0);

    /* zero unused fields */

    while (p < base + KERNEL_ARGS_ADDR + 256 + 1024) {

        WRITE_WORD(p, 0);

    }

    s = info->kernel_cmdline;

    if (s) {

        cpu_physical_memory_write(p, (void *)s, strlen(s) + 1);

    } else {

        WRITE_WORD(p, 0);

    }

}

void arm_load_kernel(CPUState *env, struct arm_boot_info *info)

{

    int kernel_size;

    int initrd_size;

    int n;

    int is_linux = 0;

    uint64_t elf_entry;

    a_target_phys_addr entry;

    int big_endian;

    /* Load the kernel.  */

    if (!info->kernel_filename) {

        fprintf(stderr, "Kernel image must be specified\n");

        exit(1);

    }

    if (!env->boot_info) {

        if (info->nb_cpus == 0)

            info->nb_cpus = 1;

        env->boot_info = info;

        qemu_register_reset(main_cpu_reset, env);

    }

#ifdef TARGET_WORDS_BIGENDIAN

    big_endian = 1;

#else

    big_endian = 0;

#endif

    /* Assume that raw images are linux kernels, and ELF images are not.  */

    kernel_size = load_elf(info->kernel_filename, 0, &elf_entry, NULL, NULL,

                           big_endian, ELF_MACHINE, 1);

    entry = elf_entry;

    if (kernel_size < 0) {

        kernel_size = load_uimage(info->kernel_filename, &entry, NULL,

                                  &is_linux);

    }

    if (kernel_size < 0) {

        entry = info->loader_start + KERNEL_LOAD_ADDR;

        kernel_size = load_image_targphys(info->kernel_filename, entry,

                                          ram_size - KERNEL_LOAD_ADDR);

        is_linux = 1;

    }

    if (kernel_size < 0) {

        fprintf(stderr, "qemu: could not load kernel '%s'\n",

                info->kernel_filename);

        exit(1);

    }

    if (!is_linux) {

        /* Jump to the entry point.  */

        env->regs[15] = entry & 0xfffffffe;

        env->thumb = entry & 1;

    } else {

        if (info->initrd_filename) {

            initrd_size = load_image_targphys(info->initrd_filename,

                                              info->loader_start

                                              + INITRD_LOAD_ADDR,

                                              ram_size - INITRD_LOAD_ADDR);

            if (initrd_size < 0) {

                fprintf(stderr, "qemu: could not load initrd '%s'\n",

                        info->initrd_filename);

                exit(1);

            }

        } else {

            initrd_size = 0;

        }

        bootloader[1] |= info->board_id & 0xff;

        bootloader[2] |= (info->board_id >> 8) & 0xff;

        bootloader[5] = info->loader_start + KERNEL_ARGS_ADDR;

        bootloader[6] = entry;

        for (n = 0; n < sizeof(bootloader) / 4; n++) {

            stl_phys_notdirty(info->loader_start + (n * 4), bootloader[n]);

        }

        if (info->nb_cpus > 1) {

            for (n = 0; n < sizeof(smpboot) / 4; n++) {

                stl_phys_notdirty(info->smp_loader_start + (n * 4), smpboot[n]);

            }

        }

        if (old_param)

            set_kernel_args_old(info, initrd_size, info->loader_start);

        else

            set_kernel_args(info, initrd_size, info->loader_start);

    }

}