/* Copyright (C) 2011
 * Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de>
 *  - Added prep subcommand support
 *  - Reorganized source - modeled after powerpc version
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 *
 * Copyright (C) 2001  Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

#include <common.h>
#include <command.h>
#include <image.h>
#include <u-boot/zlib.h>
#include <asm/byteorder.h>
#include <libfdt.h>
#include <mapmem.h>
#include <fdt_support.h>
#include <asm/bootm.h>
#include <asm/secure.h>
#include <linux/compiler.h>
#include <bootm.h>
#include <vxworks.h>

#ifdef CONFIG_ARMV7_NONSEC
#include <asm/armv7.h>
#endif

DECLARE_GLOBAL_DATA_PTR;

static struct tag *params;

static ulong get_sp(void)
{
        ulong ret;

        asm("mov %0, sp" : "=r"(ret) : );
        return ret;
}

void arch_lmb_reserve(struct lmb *lmb)
{
        ulong sp;

        /*
         * Booting a (Linux) kernel image
         *
         * Allocate space for command line and board info - the
         * address should be as high as possible within the reach of
         * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
         * memory, which means far enough below the current stack
         * pointer.
         */
        sp = get_sp();
        debug("## Current stack ends at 0x%08lx ", sp);

        /* adjust sp by 4K to be safe */
        sp -= 4096;
        lmb_reserve(lmb, sp,
                    gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
}

/**
 * announce_and_cleanup() - Print message and prepare for kernel boot
 *
 * @fake: non-zero to do everything except actually boot
 */
static void announce_and_cleanup(int fake)
{
        printf("\nStarting kernel ...%s\n\n", fake ?
                "(fake run for tracing)" : "");
        bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
#ifdef CONFIG_BOOTSTAGE_FDT
        bootstage_fdt_add_report();
#endif
#ifdef CONFIG_BOOTSTAGE_REPORT
        bootstage_report();
#endif

#ifdef CONFIG_USB_DEVICE
        udc_disconnect();
#endif
        cleanup_before_linux();
}

static void setup_start_tag (bd_t *bd)
{
        params = (struct tag *)bd->bi_boot_params;

        params->hdr.tag = ATAG_CORE;
        params->hdr.size = tag_size (tag_core);

        params->u.core.flags = 0;
        params->u.core.pagesize = 0;
        params->u.core.rootdev = 0;

        params = tag_next (params);
}

static void setup_memory_tags(bd_t *bd)
{
        int i;

        for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
                params->hdr.tag = ATAG_MEM;
                params->hdr.size = tag_size (tag_mem32);

                params->u.mem.start = bd->bi_dram[i].start;
                params->u.mem.size = bd->bi_dram[i].size;

                params = tag_next (params);
        }
}

static void setup_commandline_tag(bd_t *bd, char *commandline)
{
        char *p;

        if (!commandline)
                return;

        /* eat leading white space */
        for (p = commandline; *p == ' '; p++);

        /* skip non-existent command lines so the kernel will still
         * use its default command line.
         */
        if (*p == '\0')
                return;

        params->hdr.tag = ATAG_CMDLINE;
        params->hdr.size =
                (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;

        strcpy (params->u.cmdline.cmdline, p);

        params = tag_next (params);
}

static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
{
        /* an ATAG_INITRD node tells the kernel where the compressed
         * ramdisk can be found. ATAG_RDIMG is a better name, actually.
         */
        params->hdr.tag = ATAG_INITRD2;
        params->hdr.size = tag_size (tag_initrd);

        params->u.initrd.start = initrd_start;
        params->u.initrd.size = initrd_end - initrd_start;

        params = tag_next (params);
}

static void setup_serial_tag(struct tag **tmp)
{
        struct tag *params = *tmp;
        struct tag_serialnr serialnr;

        get_board_serial(&serialnr);
        params->hdr.tag = ATAG_SERIAL;
        params->hdr.size = tag_size (tag_serialnr);
        params->u.serialnr.low = serialnr.low;
        params->u.serialnr.high= serialnr.high;
        params = tag_next (params);
        *tmp = params;
}

static void setup_revision_tag(struct tag **in_params)
{
        u32 rev = 0;

        rev = get_board_rev();
        params->hdr.tag = ATAG_REVISION;
        params->hdr.size = tag_size (tag_revision);
        params->u.revision.rev = rev;
        params = tag_next (params);
}

static void setup_end_tag(bd_t *bd)
{
        params->hdr.tag = ATAG_NONE;
        params->hdr.size = 0;
}

__weak void setup_board_tags(struct tag **in_params) {}

#ifdef CONFIG_ARM64
static void do_nonsec_virt_switch(void)
{
        smp_kick_all_cpus();
        dcache_disable();       /* flush cache before swtiching to EL2 */
        armv8_switch_to_el2();
#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
        armv8_switch_to_el1();
#endif
}
#endif

/* Subcommand: PREP */
static void boot_prep_linux(bootm_headers_t *images)
{
        char *commandline = getenv("bootargs");

        if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
#ifdef CONFIG_OF_LIBFDT
                debug("using: FDT\n");
                if (image_setup_linux(images)) {
                        printf("FDT creation failed! hanging...");
                        hang();
                }
#endif
        } else if (BOOTM_ENABLE_TAGS) {
                debug("using: ATAGS\n");
                setup_start_tag(gd->bd);
                if (BOOTM_ENABLE_SERIAL_TAG)
                        setup_serial_tag(&params);
                if (BOOTM_ENABLE_CMDLINE_TAG)
                        setup_commandline_tag(gd->bd, commandline);
                if (BOOTM_ENABLE_REVISION_TAG)
                        setup_revision_tag(&params);
                if (BOOTM_ENABLE_MEMORY_TAGS)
                        setup_memory_tags(gd->bd);
                if (BOOTM_ENABLE_INITRD_TAG) {
                        /*
                         * In boot_ramdisk_high(), it may relocate ramdisk to
                         * a specified location. And set images->initrd_start &
                         * images->initrd_end to relocated ramdisk's start/end
                         * addresses. So use them instead of images->rd_start &
                         * images->rd_end when possible.
                         */
                        if (images->initrd_start && images->initrd_end) {
                                setup_initrd_tag(gd->bd, images->initrd_start,
                                                 images->initrd_end);
                        } else if (images->rd_start && images->rd_end) {
                                setup_initrd_tag(gd->bd, images->rd_start,
                                                 images->rd_end);
                        }
                }
                setup_board_tags(&params);
                setup_end_tag(gd->bd);
        } else {
                printf("FDT and ATAGS support not compiled in - hanging\n");
                hang();
        }
}

__weak bool armv7_boot_nonsec_default(void)
{
#ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
        return false;
#else
        return true;
#endif
}

#ifdef CONFIG_ARMV7_NONSEC
bool armv7_boot_nonsec(void)
{
        char *s = getenv("bootm_boot_mode");
        bool nonsec = armv7_boot_nonsec_default();

        if (s && !strcmp(s, "sec"))
                nonsec = false;

        if (s && !strcmp(s, "nonsec"))
                nonsec = true;

        return nonsec;
}
#endif

/* Subcommand: GO */
static void boot_jump_linux(bootm_headers_t *images, int flag)
{
#ifdef CONFIG_ARM64
        void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
                        void *res2);
        int fake = (flag & BOOTM_STATE_OS_FAKE_GO);

        kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
                                void *res2))images->ep;

        debug("## Transferring control to Linux (at address %lx)...\n",
                (ulong) kernel_entry);
        bootstage_mark(BOOTSTAGE_ID_RUN_OS);

        announce_and_cleanup(fake);

        if (!fake) {
                do_nonsec_virt_switch();
                kernel_entry(images->ft_addr, NULL, NULL, NULL);
        }
#else
        unsigned long machid = gd->bd->bi_arch_number;
        char *s;
        void (*kernel_entry)(int zero, int arch, uint params);
        unsigned long r2;
        int fake = (flag & BOOTM_STATE_OS_FAKE_GO);

        kernel_entry = (void (*)(int, int, uint))images->ep;

        s = getenv("machid");
        if (s) {
                if (strict_strtoul(s, 16, &machid) < 0) {
                        debug("strict_strtoul failed!\n");
                        return;
                }
                printf("Using machid 0x%lx from environment\n", machid);
        }

        debug("## Transferring control to Linux (at address %08lx)" \
                "...\n", (ulong) kernel_entry);
        bootstage_mark(BOOTSTAGE_ID_RUN_OS);
        announce_and_cleanup(fake);

        if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
                r2 = (unsigned long)images->ft_addr;
        else
                r2 = gd->bd->bi_boot_params;

        if (!fake) {
#ifdef CONFIG_ARMV7_NONSEC
                if (armv7_boot_nonsec()) {
                        armv7_init_nonsec();
                        secure_ram_addr(_do_nonsec_entry)(kernel_entry,
                                                          0, machid, r2);
                } else
#endif
                        kernel_entry(0, machid, r2);
        }
#endif
}

/* Main Entry point for arm bootm implementation
 *
 * Modeled after the powerpc implementation
 * DIFFERENCE: Instead of calling prep and go at the end
 * they are called if subcommand is equal 0.
 */
int do_bootm_linux(int flag, int argc, char * const argv[],
                   bootm_headers_t *images)
{
        /* No need for those on ARM */
        if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
                return -1;

        if (flag & BOOTM_STATE_OS_PREP) {
                boot_prep_linux(images);
                return 0;
        }

        if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
                boot_jump_linux(images, flag);
                return 0;
        }

        boot_prep_linux(images);
        boot_jump_linux(images, flag);
        return 0;
}

#if defined(CONFIG_BOOTM_VXWORKS)
void boot_prep_vxworks(bootm_headers_t *images)
{
#if defined(CONFIG_OF_LIBFDT)
        int off;

        if (images->ft_addr) {
                off = fdt_path_offset(images->ft_addr, "/memory");
                if (off < 0) {
#ifdef CONFIG_ARCH_FIXUP_FDT
                        if (arch_fixup_fdt(images->ft_addr))
                                puts("## WARNING: fixup memory failed!\n");
#endif
                }
        }
#endif
        cleanup_before_linux();
}
void boot_jump_vxworks(bootm_headers_t *images)
{
        /* ARM VxWorks requires device tree physical address to be passed */
        ((void (*)(void *))images->ep)(images->ft_addr);
}
#endif