/*
 * Copyright (c) 2001 William L. Pitts
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are freely
 * permitted provided that the above copyright notice and this
 * paragraph and the following disclaimer are duplicated in all
 * such forms.
 *
 * This software is provided "AS IS" and without any express or
 * implied warranties, including, without limitation, the implied
 * warranties of merchantability and fitness for a particular
 * purpose.
 */

#include <common.h>
#include <command.h>
#include <elf.h>
#include <environment.h>
#include <net.h>
#include <vxworks.h>
#ifdef CONFIG_X86
#include <vbe.h>
#include <asm/e820.h>
#include <linux/linkage.h>
#endif

/*
 * A very simple ELF64 loader, assumes the image is valid, returns the
 * entry point address.
 *
 * Note if U-Boot is 32-bit, the loader assumes the to segment's
 * physical address and size is within the lower 32-bit address space.
 */
static unsigned long load_elf64_image_phdr(unsigned long addr)
{
        Elf64_Ehdr *ehdr; /* Elf header structure pointer */
        Elf64_Phdr *phdr; /* Program header structure pointer */
        int i;

        ehdr = (Elf64_Ehdr *)addr;
        phdr = (Elf64_Phdr *)(addr + (ulong)ehdr->e_phoff);

        /* Load each program header */
        for (i = 0; i < ehdr->e_phnum; ++i) {
                void *dst = (void *)(ulong)phdr->p_paddr;
                void *src = (void *)addr + phdr->p_offset;

                debug("Loading phdr %i to 0x%p (%lu bytes)\n",
                      i, dst, (ulong)phdr->p_filesz);
                if (phdr->p_filesz)
                        memcpy(dst, src, phdr->p_filesz);
                if (phdr->p_filesz != phdr->p_memsz)
                        memset(dst + phdr->p_filesz, 0x00,
                               phdr->p_memsz - phdr->p_filesz);
                flush_cache((unsigned long)dst, phdr->p_filesz);
                ++phdr;
        }

        if (ehdr->e_machine == EM_PPC64 && (ehdr->e_flags &
                                            EF_PPC64_ELFV1_ABI)) {
                /*
                 * For the 64-bit PowerPC ELF V1 ABI, e_entry is a function
                 * descriptor pointer with the first double word being the
                 * address of the entry point of the function.
                 */
                uintptr_t addr = ehdr->e_entry;

                return *(Elf64_Addr *)addr;
        }

        return ehdr->e_entry;
}

static unsigned long load_elf64_image_shdr(unsigned long addr)
{
        Elf64_Ehdr *ehdr; /* Elf header structure pointer */
        Elf64_Shdr *shdr; /* Section header structure pointer */
        unsigned char *strtab = 0; /* String table pointer */
        unsigned char *image; /* Binary image pointer */
        int i; /* Loop counter */

        ehdr = (Elf64_Ehdr *)addr;

        /* Find the section header string table for output info */
        shdr = (Elf64_Shdr *)(addr + (ulong)ehdr->e_shoff +
                             (ehdr->e_shstrndx * sizeof(Elf64_Shdr)));

        if (shdr->sh_type == SHT_STRTAB)
                strtab = (unsigned char *)(addr + (ulong)shdr->sh_offset);

        /* Load each appropriate section */
        for (i = 0; i < ehdr->e_shnum; ++i) {
                shdr = (Elf64_Shdr *)(addr + (ulong)ehdr->e_shoff +
                                     (i * sizeof(Elf64_Shdr)));

                if (!(shdr->sh_flags & SHF_ALLOC) ||
                    shdr->sh_addr == 0 || shdr->sh_size == 0) {
                        continue;
                }

                if (strtab) {
                        debug("%sing %s @ 0x%08lx (%ld bytes)\n",
                              (shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
                               &strtab[shdr->sh_name],
                               (unsigned long)shdr->sh_addr,
                               (long)shdr->sh_size);
                }

                if (shdr->sh_type == SHT_NOBITS) {
                        memset((void *)(uintptr_t)shdr->sh_addr, 0,
                               shdr->sh_size);
                } else {
                        image = (unsigned char *)addr + (ulong)shdr->sh_offset;
                        memcpy((void *)(uintptr_t)shdr->sh_addr,
                               (const void *)image, shdr->sh_size);
                }
                flush_cache(rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN),
                            roundup((shdr->sh_addr + shdr->sh_size),
                                     ARCH_DMA_MINALIGN) -
                                    rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN));
        }

        if (ehdr->e_machine == EM_PPC64 && (ehdr->e_flags &
                                            EF_PPC64_ELFV1_ABI)) {
                /*
                 * For the 64-bit PowerPC ELF V1 ABI, e_entry is a function
                 * descriptor pointer with the first double word being the
                 * address of the entry point of the function.
                 */
                uintptr_t addr = ehdr->e_entry;

                return *(Elf64_Addr *)addr;
        }

        return ehdr->e_entry;
}

/*
 * A very simple ELF loader, assumes the image is valid, returns the
 * entry point address.
 *
 * The loader firstly reads the EFI class to see if it's a 64-bit image.
 * If yes, call the ELF64 loader. Otherwise continue with the ELF32 loader.
 */
static unsigned long load_elf_image_phdr(unsigned long addr)
{
        Elf32_Ehdr *ehdr; /* Elf header structure pointer */
        Elf32_Phdr *phdr; /* Program header structure pointer */
        int i;

        ehdr = (Elf32_Ehdr *)addr;
        if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
                return load_elf64_image_phdr(addr);

        phdr = (Elf32_Phdr *)(addr + ehdr->e_phoff);

        /* Load each program header */
        for (i = 0; i < ehdr->e_phnum; ++i) {
                void *dst = (void *)(uintptr_t)phdr->p_paddr;
                void *src = (void *)addr + phdr->p_offset;

                debug("Loading phdr %i to 0x%p (%i bytes)\n",
                      i, dst, phdr->p_filesz);
                if (phdr->p_filesz)
                        memcpy(dst, src, phdr->p_filesz);
                if (phdr->p_filesz != phdr->p_memsz)
                        memset(dst + phdr->p_filesz, 0x00,
                               phdr->p_memsz - phdr->p_filesz);
                flush_cache((unsigned long)dst, phdr->p_filesz);
                ++phdr;
        }

        return ehdr->e_entry;
}

static unsigned long load_elf_image_shdr(unsigned long addr)
{
        Elf32_Ehdr *ehdr; /* Elf header structure pointer */
        Elf32_Shdr *shdr; /* Section header structure pointer */
        unsigned char *strtab = 0; /* String table pointer */
        unsigned char *image; /* Binary image pointer */
        int i; /* Loop counter */

        ehdr = (Elf32_Ehdr *)addr;
        if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
                return load_elf64_image_shdr(addr);

        /* Find the section header string table for output info */
        shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
                             (ehdr->e_shstrndx * sizeof(Elf32_Shdr)));

        if (shdr->sh_type == SHT_STRTAB)
                strtab = (unsigned char *)(addr + shdr->sh_offset);

        /* Load each appropriate section */
        for (i = 0; i < ehdr->e_shnum; ++i) {
                shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
                                     (i * sizeof(Elf32_Shdr)));

                if (!(shdr->sh_flags & SHF_ALLOC) ||
                    shdr->sh_addr == 0 || shdr->sh_size == 0) {
                        continue;
                }

                if (strtab) {
                        debug("%sing %s @ 0x%08lx (%ld bytes)\n",
                              (shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
                               &strtab[shdr->sh_name],
                               (unsigned long)shdr->sh_addr,
                               (long)shdr->sh_size);
                }

                if (shdr->sh_type == SHT_NOBITS) {
                        memset((void *)(uintptr_t)shdr->sh_addr, 0,
                               shdr->sh_size);
                } else {
                        image = (unsigned char *)addr + shdr->sh_offset;
                        memcpy((void *)(uintptr_t)shdr->sh_addr,
                               (const void *)image, shdr->sh_size);
                }
                flush_cache(rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN),
                            roundup((shdr->sh_addr + shdr->sh_size),
                                    ARCH_DMA_MINALIGN) -
                            rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN));
        }

        return ehdr->e_entry;
}

/* Allow ports to override the default behavior */
static unsigned long do_bootelf_exec(ulong (*entry)(int, char * const[]),
                                     int argc, char * const argv[])
{
        unsigned long ret;

        /*
         * pass address parameter as argv[0] (aka command name),
         * and all remaining args
         */
        ret = entry(argc, argv);

        return ret;
}

/*
 * Determine if a valid ELF image exists at the given memory location.
 * First look at the ELF header magic field, then make sure that it is
 * executable.
 */
int valid_elf_image(unsigned long addr)
{
        Elf32_Ehdr *ehdr; /* Elf header structure pointer */

        ehdr = (Elf32_Ehdr *)addr;

        if (!IS_ELF(*ehdr)) {
                printf("## No elf image at address 0x%08lx\n", addr);
                return 0;
        }

        if (ehdr->e_type != ET_EXEC) {
                printf("## Not a 32-bit elf image at address 0x%08lx\n", addr);
                return 0;
        }

        return 1;
}

/* Interpreter command to boot an arbitrary ELF image from memory */
int do_bootelf(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
        unsigned long addr; /* Address of the ELF image */
        unsigned long rc; /* Return value from user code */
        char *sload = NULL;
        const char *ep = env_get("autostart");
        int rcode = 0;

        /* Consume 'bootelf' */
        argc--; argv++;

        /* Check for flag. */
        if (argc >= 1 && (argv[0][0] == '-' && \
                                (argv[0][1] == 'p' || argv[0][1] == 's'))) {
                sload = argv[0];
                /* Consume flag. */
                argc--; argv++;
        }
        /* Check for address. */
        if (argc >= 1 && strict_strtoul(argv[0], 16, &addr) != -EINVAL) {
                /* Consume address */
                argc--; argv++;
        } else
                addr = load_addr;

        if (!valid_elf_image(addr))
                return 1;

        if (sload && sload[1] == 'p')
                addr = load_elf_image_phdr(addr);
        else
                addr = load_elf_image_shdr(addr);

        if (ep && !strcmp(ep, "no"))
                return rcode;

        printf("## Starting application at 0x%08lx ...\n", addr);

        /*
         * pass address parameter as argv[0] (aka command name),
         * and all remaining args
         */
        rc = do_bootelf_exec((void *)addr, argc, argv);
        if (rc != 0)
                rcode = 1;

        printf("## Application terminated, rc = 0x%lx\n", rc);

        return rcode;
}

/*
 * Interpreter command to boot VxWorks from a memory image.  The image can
 * be either an ELF image or a raw binary.  Will attempt to setup the
 * bootline and other parameters correctly.
 */
int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
        unsigned long addr; /* Address of image */
        unsigned long bootaddr = 0; /* Address to put the bootline */
        char *bootline; /* Text of the bootline */
        char *tmp; /* Temporary char pointer */
        char build_buf[128]; /* Buffer for building the bootline */
        int ptr = 0;
#ifdef CONFIG_X86
        ulong base;
        struct e820_info *info;
        struct e820_entry *data;
        struct efi_gop_info *gop;
        struct vesa_mode_info *vesa = &mode_info.vesa;
#endif

        /*
         * Check the loadaddr variable.
         * If we don't know where the image is then we're done.
         */
        if (argc < 2)
                addr = load_addr;
        else
                addr = simple_strtoul(argv[1], NULL, 16);

#if defined(CONFIG_CMD_NET)
        /*
         * Check to see if we need to tftp the image ourselves
         * before starting
         */
        if ((argc == 2) && (strcmp(argv[1], "tftp") == 0)) {
                if (net_loop(TFTPGET) <= 0)
                        return 1;
                printf("Automatic boot of VxWorks image at address 0x%08lx ...\n",
                        addr);
        }
#endif

        /*
         * This should equate to
         * NV_RAM_ADRS + NV_BOOT_OFFSET + NV_ENET_OFFSET
         * from the VxWorks BSP header files.
         * This will vary from board to board
         */
#if defined(CONFIG_SYS_VXWORKS_MAC_PTR)
        tmp = (char *)CONFIG_SYS_VXWORKS_MAC_PTR;
        eth_env_get_enetaddr("ethaddr", (uchar *)build_buf);
        memcpy(tmp, build_buf, 6);
#else
        puts("## Ethernet MAC address not copied to NV RAM\n");
#endif

#ifdef CONFIG_X86
        /*
         * Get VxWorks's physical memory base address from environment,
         * if we don't specify it in the environment, use a default one.
         */
        base = env_get_hex("vx_phys_mem_base", VXWORKS_PHYS_MEM_BASE);
        data = (struct e820_entry *)(base + E820_DATA_OFFSET);
        info = (struct e820_info *)(base + E820_INFO_OFFSET);

        memset(info, 0, sizeof(struct e820_info));
        info->sign = E820_SIGNATURE;
        info->entries = install_e820_map(E820MAX, data);
        info->addr = (info->entries - 1) * sizeof(struct e820_entry) +
                     E820_DATA_OFFSET;

        /*
         * Explicitly clear the bootloader image size otherwise if memory
         * at this offset happens to contain some garbage data, the final
         * available memory size for the kernel is insane.
         */
        *(u32 *)(base + BOOT_IMAGE_SIZE_OFFSET) = 0;

        /*
         * Prepare compatible framebuffer information block.
         * The VESA mode has to be 32-bit RGBA.
         */
        if (vesa->x_resolution && vesa->y_resolution) {
                gop = (struct efi_gop_info *)(base + EFI_GOP_INFO_OFFSET);
                gop->magic = EFI_GOP_INFO_MAGIC;
                gop->info.version = 0;
                gop->info.width = vesa->x_resolution;
                gop->info.height = vesa->y_resolution;
                gop->info.pixel_format = EFI_GOT_RGBA8;
                gop->info.pixels_per_scanline = vesa->bytes_per_scanline / 4;
                gop->fb_base = vesa->phys_base_ptr;
                gop->fb_size = vesa->bytes_per_scanline * vesa->y_resolution;
        }
#endif

        /*
         * Use bootaddr to find the location in memory that VxWorks
         * will look for the bootline string. The default value is
         * (LOCAL_MEM_LOCAL_ADRS + BOOT_LINE_OFFSET) as defined by
         * VxWorks BSP. For example, on PowerPC it defaults to 0x4200.
         */
        tmp = env_get("bootaddr");
        if (!tmp) {
#ifdef CONFIG_X86
                bootaddr = base + X86_BOOT_LINE_OFFSET;
#else
                printf("## VxWorks bootline address not specified\n");
                return 1;
#endif
        }

        if (!bootaddr)
                bootaddr = simple_strtoul(tmp, NULL, 16);

        /*
         * Check to see if the bootline is defined in the 'bootargs' parameter.
         * If it is not defined, we may be able to construct the info.
         */
        bootline = env_get("bootargs");
        if (!bootline) {
                tmp = env_get("bootdev");
                if (tmp) {
                        strcpy(build_buf, tmp);
                        ptr = strlen(tmp);
                } else {
                        printf("## VxWorks boot device not specified\n");
                }

                tmp = env_get("bootfile");
                if (tmp)
                        ptr += sprintf(build_buf + ptr, "host:%s ", tmp);
                else
                        ptr += sprintf(build_buf + ptr, "host:vxWorks ");

                /*
                 * The following parameters are only needed if 'bootdev'
                 * is an ethernet device, otherwise they are optional.
                 */
                tmp = env_get("ipaddr");
                if (tmp) {
                        ptr += sprintf(build_buf + ptr, "e=%s", tmp);
                        tmp = env_get("netmask");
                        if (tmp) {
                                u32 mask = env_get_ip("netmask").s_addr;
                                ptr += sprintf(build_buf + ptr,
                                               ":%08x ", ntohl(mask));
                        } else {
                                ptr += sprintf(build_buf + ptr, " ");
                        }
                }

                tmp = env_get("serverip");
                if (tmp)
                        ptr += sprintf(build_buf + ptr, "h=%s ", tmp);

                tmp = env_get("gatewayip");
                if (tmp)
                        ptr += sprintf(build_buf + ptr, "g=%s ", tmp);

                tmp = env_get("hostname");
                if (tmp)
                        ptr += sprintf(build_buf + ptr, "tn=%s ", tmp);

                tmp = env_get("othbootargs");
                if (tmp) {
                        strcpy(build_buf + ptr, tmp);
                        ptr += strlen(tmp);
                }

                bootline = build_buf;
        }

        memcpy((void *)bootaddr, bootline, max(strlen(bootline), (size_t)255));
        flush_cache(bootaddr, max(strlen(bootline), (size_t)255));
        printf("## Using bootline (@ 0x%lx): %s\n", bootaddr, (char *)bootaddr);

        /*
         * If the data at the load address is an elf image, then
         * treat it like an elf image. Otherwise, assume that it is a
         * binary image.
         */
        if (valid_elf_image(addr))
                addr = load_elf_image_phdr(addr);
        else
                puts("## Not an ELF image, assuming binary\n");

        printf("## Starting vxWorks at 0x%08lx ...\n", addr);

        dcache_disable();
#if defined(CONFIG_ARM64) && defined(CONFIG_ARMV8_PSCI)
        armv8_setup_psci();
        smp_kick_all_cpus();
#endif

#ifdef CONFIG_X86
        /* VxWorks on x86 uses stack to pass parameters */
        ((asmlinkage void (*)(int))addr)(0);
#else
        ((void (*)(int))addr)(0);
#endif

        puts("## vxWorks terminated\n");

        return 1;
}

U_BOOT_CMD(
        bootelf, CONFIG_SYS_MAXARGS, 0, do_bootelf,
        "Boot from an ELF image in memory",
        "[-p|-s] [address]\n"
        "\t- load ELF image at [address] via program headers (-p)\n"
        "\t  or via section headers (-s)"
);

U_BOOT_CMD(
        bootvx, 2, 0, do_bootvx,
        "Boot vxWorks from an ELF image",
        " [address] - load address of vxWorks ELF image."
);