/*
 * dbll.c
 *
 * DSP-BIOS Bridge driver support functions for TI OMAP processors.
 *
 * Copyright (C) 2005-2006 Texas Instruments, Inc.
 *
 * This package is free software;  you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */
#include <linux/types.h>

/*  ----------------------------------- Host OS */
#include <dspbridge/host_os.h>

/*  ----------------------------------- DSP/BIOS Bridge */
#include <dspbridge/dbdefs.h>

#include <dspbridge/gh.h>

/*  ----------------------------------- OS Adaptation Layer */

/* Dynamic loader library interface */
#include <dspbridge/dynamic_loader.h>
#include <dspbridge/getsection.h>

/*  ----------------------------------- This */
#include <dspbridge/dbll.h>
#include <dspbridge/rmm.h>

/* Number of buckets for symbol hash table */
#define MAXBUCKETS 211

/* Max buffer length */
#define MAXEXPR 128

#define DOFF_ALIGN(x) (((x) + 3) & ~3UL)

/*
 *  ======== struct dbll_tar_obj* ========
 *  A target may have one or more libraries of symbols/code/data loaded
 *  onto it, where a library is simply the symbols/code/data contained
 *  in a DOFF file.
 */
/*
 *  ======== dbll_tar_obj ========
 */
struct dbll_tar_obj {
        struct dbll_attrs attrs;
        struct dbll_library_obj *head;  /* List of all opened libraries */
};

/*
 *  The following 4 typedefs are "super classes" of the dynamic loader
 *  library types used in dynamic loader functions (dynamic_loader.h).
 */
/*
 *  ======== dbll_stream ========
 *  Contains dynamic_loader_stream
 */
struct dbll_stream {
        struct dynamic_loader_stream dl_stream;
        struct dbll_library_obj *lib;
};

/*
 *  ======== ldr_symbol ========
 */
struct ldr_symbol {
        struct dynamic_loader_sym dl_symbol;
        struct dbll_library_obj *lib;
};

/*
 *  ======== dbll_alloc ========
 */
struct dbll_alloc {
        struct dynamic_loader_allocate dl_alloc;
        struct dbll_library_obj *lib;
};

/*
 *  ======== dbll_init_obj ========
 */
struct dbll_init_obj {
        struct dynamic_loader_initialize dl_init;
        struct dbll_library_obj *lib;
};

/*
 *  ======== DBLL_Library ========
 *  A library handle is returned by DBLL_Open() and is passed to dbll_load()
 *  to load symbols/code/data, and to dbll_unload(), to remove the
 *  symbols/code/data loaded by dbll_load().
 */

/*
 *  ======== dbll_library_obj ========
 */
struct dbll_library_obj {
        struct dbll_library_obj *next;  /* Next library in target's list */
        struct dbll_library_obj *prev;  /* Previous in the list */
        struct dbll_tar_obj *target_obj;        /* target for this library */

        /* Objects needed by dynamic loader */
        struct dbll_stream stream;
        struct ldr_symbol symbol;
        struct dbll_alloc allocate;
        struct dbll_init_obj init;
        void *dload_mod_obj;

        char *file_name;        /* COFF file name */
        void *fp;               /* Opaque file handle */
        u32 entry;              /* Entry point */
        void *desc;     /* desc of DOFF file loaded */
        u32 open_ref;           /* Number of times opened */
        u32 load_ref;           /* Number of times loaded */
        struct gh_t_hash_tab *sym_tab;  /* Hash table of symbols */
        u32 pos;
};

/*
 *  ======== dbll_symbol ========
 */
struct dbll_symbol {
        struct dbll_sym_val value;
        char *name;
};

static void dof_close(struct dbll_library_obj *zl_lib);
static int dof_open(struct dbll_library_obj *zl_lib);
static s32 no_op(struct dynamic_loader_initialize *thisptr, void *bufr,
                 ldr_addr locn, struct ldr_section_info *info,
                 unsigned bytsize);

/*
 *  Functions called by dynamic loader
 *
 */
/* dynamic_loader_stream */
static int dbll_read_buffer(struct dynamic_loader_stream *this, void *buffer,
                            unsigned bufsize);
static int dbll_set_file_posn(struct dynamic_loader_stream *this,
                              unsigned int pos);
/* dynamic_loader_sym */
static struct dynload_symbol *dbll_find_symbol(struct dynamic_loader_sym *this,
                                               const char *name);
static struct dynload_symbol *dbll_add_to_symbol_table(struct dynamic_loader_sym
                                                       *this, const char *name,
                                                       unsigned module_id);
static struct dynload_symbol *find_in_symbol_table(struct dynamic_loader_sym
                                                   *this, const char *name,
                                                   unsigned moduleid);
static void dbll_purge_symbol_table(struct dynamic_loader_sym *this,
                                    unsigned module_id);
static void *allocate(struct dynamic_loader_sym *this, unsigned memsize);
static void deallocate(struct dynamic_loader_sym *this, void *mem_ptr);
static void dbll_err_report(struct dynamic_loader_sym *this, const char *errstr,
                            va_list args);
/* dynamic_loader_allocate */
static int dbll_rmm_alloc(struct dynamic_loader_allocate *this,
                          struct ldr_section_info *info, unsigned align);
static void rmm_dealloc(struct dynamic_loader_allocate *this,
                        struct ldr_section_info *info);

/* dynamic_loader_initialize */
static int connect(struct dynamic_loader_initialize *this);
static int read_mem(struct dynamic_loader_initialize *this, void *buf,
                    ldr_addr addr, struct ldr_section_info *info,
                    unsigned bytes);
static int write_mem(struct dynamic_loader_initialize *this, void *buf,
                     ldr_addr addr, struct ldr_section_info *info,
                     unsigned nbytes);
static int fill_mem(struct dynamic_loader_initialize *this, ldr_addr addr,
                    struct ldr_section_info *info, unsigned bytes,
                    unsigned val);
static int execute(struct dynamic_loader_initialize *this, ldr_addr start);
static void release(struct dynamic_loader_initialize *this);

/* symbol table hash functions */
static u16 name_hash(void *key, u16 max_bucket);
static bool name_match(void *key, void *sp);
static void sym_delete(void *value);

/* Symbol Redefinition */
static int redefined_symbol;
static int gbl_search = 1;

/*
 *  ======== dbll_close ========
 */
void dbll_close(struct dbll_library_obj *zl_lib)
{
        struct dbll_tar_obj *zl_target;

        zl_target = zl_lib->target_obj;
        zl_lib->open_ref--;
        if (zl_lib->open_ref == 0) {
                /* Remove library from list */
                if (zl_target->head == zl_lib)
                        zl_target->head = zl_lib->next;

                if (zl_lib->prev)
                        (zl_lib->prev)->next = zl_lib->next;

                if (zl_lib->next)
                        (zl_lib->next)->prev = zl_lib->prev;

                /* Free DOF resources */
                dof_close(zl_lib);
                kfree(zl_lib->file_name);

                /* remove symbols from symbol table */
                if (zl_lib->sym_tab)
                        gh_delete(zl_lib->sym_tab);

                /* remove the library object itself */
                kfree(zl_lib);
                zl_lib = NULL;
        }
}

/*
 *  ======== dbll_create ========
 */
int dbll_create(struct dbll_tar_obj **target_obj,
                       struct dbll_attrs *pattrs)
{
        struct dbll_tar_obj *pzl_target;
        int status = 0;

        /* Allocate DBL target object */
        pzl_target = kzalloc(sizeof(struct dbll_tar_obj), GFP_KERNEL);
        if (target_obj != NULL) {
                if (pzl_target == NULL) {
                        *target_obj = NULL;
                        status = -ENOMEM;
                } else {
                        pzl_target->attrs = *pattrs;
                        *target_obj = (struct dbll_tar_obj *)pzl_target;
                }
        }

        return status;
}

/*
 *  ======== dbll_delete ========
 */
void dbll_delete(struct dbll_tar_obj *target)
{
        struct dbll_tar_obj *zl_target = (struct dbll_tar_obj *)target;

        kfree(zl_target);

}

/*
 *  ======== dbll_exit ========
 *  Discontinue usage of DBL module.
 */
void dbll_exit(void)
{
        /* do nothing */
}

/*
 *  ======== dbll_get_addr ========
 *  Get address of name in the specified library.
 */
bool dbll_get_addr(struct dbll_library_obj *zl_lib, char *name,
                   struct dbll_sym_val **sym_val)
{
        struct dbll_symbol *sym;
        bool status = false;

        sym = (struct dbll_symbol *)gh_find(zl_lib->sym_tab, name);
        if (sym != NULL) {
                *sym_val = &sym->value;
                status = true;
        }

        dev_dbg(bridge, "%s: lib: %p name: %s paddr: %p, status 0x%x\n",
                __func__, zl_lib, name, sym_val, status);
        return status;
}

/*
 *  ======== dbll_get_attrs ========
 *  Retrieve the attributes of the target.
 */
void dbll_get_attrs(struct dbll_tar_obj *target, struct dbll_attrs *pattrs)
{
        struct dbll_tar_obj *zl_target = (struct dbll_tar_obj *)target;

        if ((pattrs != NULL) && (zl_target != NULL))
                *pattrs = zl_target->attrs;

}

/*
 *  ======== dbll_get_c_addr ========
 *  Get address of a "C" name in the specified library.
 */
bool dbll_get_c_addr(struct dbll_library_obj *zl_lib, char *name,
                     struct dbll_sym_val **sym_val)
{
        struct dbll_symbol *sym;
        char cname[MAXEXPR + 1];
        bool status = false;

        cname[0] = '_';

        strncpy(cname + 1, name, sizeof(cname) - 2);
        cname[MAXEXPR] = '\0';  /* insure '\0' string termination */

        /* Check for C name, if not found */
        sym = (struct dbll_symbol *)gh_find(zl_lib->sym_tab, cname);

        if (sym != NULL) {
                *sym_val = &sym->value;
                status = true;
        }

        return status;
}

/*
 *  ======== dbll_get_sect ========
 *  Get the base address and size (in bytes) of a COFF section.
 */
int dbll_get_sect(struct dbll_library_obj *lib, char *name, u32 *paddr,
                         u32 *psize)
{
        u32 byte_size;
        bool opened_doff = false;
        const struct ldr_section_info *sect = NULL;
        struct dbll_library_obj *zl_lib = (struct dbll_library_obj *)lib;
        int status = 0;

        /* If DOFF file is not open, we open it. */
        if (zl_lib != NULL) {
                if (zl_lib->fp == NULL) {
                        status = dof_open(zl_lib);
                        if (!status)
                                opened_doff = true;

                } else {
                        (*(zl_lib->target_obj->attrs.fseek)) (zl_lib->fp,
                                                              zl_lib->pos,
                                                              SEEK_SET);
                }
        } else {
                status = -EFAULT;
        }
        if (!status) {
                byte_size = 1;
                if (dload_get_section_info(zl_lib->desc, name, &sect)) {
                        *paddr = sect->load_addr;
                        *psize = sect->size * byte_size;
                        /* Make sure size is even for good swap */
                        if (*psize % 2)
                                (*psize)++;

                        /* Align size */
                        *psize = DOFF_ALIGN(*psize);
                } else {
                        status = -ENXIO;
                }
        }
        if (opened_doff) {
                dof_close(zl_lib);
                opened_doff = false;
        }

        dev_dbg(bridge, "%s: lib: %p name: %s paddr: %p psize: %p, "
                "status 0x%x\n", __func__, lib, name, paddr, psize, status);

        return status;
}

/*
 *  ======== dbll_init ========
 */
bool dbll_init(void)
{
        /* do nothing */

        return true;
}

/*
 *  ======== dbll_load ========
 */
int dbll_load(struct dbll_library_obj *lib, dbll_flags flags,
                     struct dbll_attrs *attrs, u32 *entry)
{
        struct dbll_library_obj *zl_lib = (struct dbll_library_obj *)lib;
        struct dbll_tar_obj *dbzl;
        bool got_symbols = true;
        s32 err;
        int status = 0;
        bool opened_doff = false;

        /*
         *  Load if not already loaded.
         */
        if (zl_lib->load_ref == 0 || !(flags & DBLL_DYNAMIC)) {
                dbzl = zl_lib->target_obj;
                dbzl->attrs = *attrs;
                /* Create a hash table for symbols if not already created */
                if (zl_lib->sym_tab == NULL) {
                        got_symbols = false;
                        zl_lib->sym_tab = gh_create(MAXBUCKETS,
                                                    sizeof(struct dbll_symbol),
                                                    name_hash,
                                                    name_match, sym_delete);
                        if (zl_lib->sym_tab == NULL)
                                status = -ENOMEM;

                }
                /*
                 *  Set up objects needed by the dynamic loader
                 */
                /* Stream */
                zl_lib->stream.dl_stream.read_buffer = dbll_read_buffer;
                zl_lib->stream.dl_stream.set_file_posn = dbll_set_file_posn;
                zl_lib->stream.lib = zl_lib;
                /* Symbol */
                zl_lib->symbol.dl_symbol.find_matching_symbol =
                    dbll_find_symbol;
                if (got_symbols) {
                        zl_lib->symbol.dl_symbol.add_to_symbol_table =
                            find_in_symbol_table;
                } else {
                        zl_lib->symbol.dl_symbol.add_to_symbol_table =
                            dbll_add_to_symbol_table;
                }
                zl_lib->symbol.dl_symbol.purge_symbol_table =
                    dbll_purge_symbol_table;
                zl_lib->symbol.dl_symbol.dload_allocate = allocate;
                zl_lib->symbol.dl_symbol.dload_deallocate = deallocate;
                zl_lib->symbol.dl_symbol.error_report = dbll_err_report;
                zl_lib->symbol.lib = zl_lib;
                /* Allocate */
                zl_lib->allocate.dl_alloc.dload_allocate = dbll_rmm_alloc;
                zl_lib->allocate.dl_alloc.dload_deallocate = rmm_dealloc;
                zl_lib->allocate.lib = zl_lib;
                /* Init */
                zl_lib->init.dl_init.connect = connect;
                zl_lib->init.dl_init.readmem = read_mem;
                zl_lib->init.dl_init.writemem = write_mem;
                zl_lib->init.dl_init.fillmem = fill_mem;
                zl_lib->init.dl_init.execute = execute;
                zl_lib->init.dl_init.release = release;
                zl_lib->init.lib = zl_lib;
                /* If COFF file is not open, we open it. */
                if (zl_lib->fp == NULL) {
                        status = dof_open(zl_lib);
                        if (!status)
                                opened_doff = true;

                }
                if (!status) {
                        zl_lib->pos = (*(zl_lib->target_obj->attrs.ftell))
                            (zl_lib->fp);
                        /* Reset file cursor */
                        (*(zl_lib->target_obj->attrs.fseek)) (zl_lib->fp,
                                                              (long)0,
                                                              SEEK_SET);
                        symbols_reloaded = true;
                        /* The 5th argument, DLOAD_INITBSS, tells the DLL
                         * module to zero-init all BSS sections.  In general,
                         * this is not necessary and also increases load time.
                         * We may want to make this configurable by the user */
                        err = dynamic_load_module(&zl_lib->stream.dl_stream,
                                                  &zl_lib->symbol.dl_symbol,
                                                  &zl_lib->allocate.dl_alloc,
                                                  &zl_lib->init.dl_init,
                                                  DLOAD_INITBSS,
                                                  &zl_lib->dload_mod_obj);

                        if (err != 0) {
                                status = -EILSEQ;
                        } else if (redefined_symbol) {
                                zl_lib->load_ref++;
                                dbll_unload(zl_lib, (struct dbll_attrs *)attrs);
                                redefined_symbol = false;
                                status = -EILSEQ;
                        } else {
                                *entry = zl_lib->entry;
                        }
                }
        }
        if (!status)
                zl_lib->load_ref++;

        /* Clean up DOFF resources */
        if (opened_doff)
                dof_close(zl_lib);

        dev_dbg(bridge, "%s: lib: %p flags: 0x%x entry: %p, status 0x%x\n",
                __func__, lib, flags, entry, status);

        return status;
}

/*
 *  ======== dbll_open ========
 */
int dbll_open(struct dbll_tar_obj *target, char *file, dbll_flags flags,
                     struct dbll_library_obj **lib_obj)
{
        struct dbll_tar_obj *zl_target = (struct dbll_tar_obj *)target;
        struct dbll_library_obj *zl_lib = NULL;
        s32 err;
        int status = 0;

        zl_lib = zl_target->head;
        while (zl_lib != NULL) {
                if (strcmp(zl_lib->file_name, file) == 0) {
                        /* Library is already opened */
                        zl_lib->open_ref++;
                        break;
                }
                zl_lib = zl_lib->next;
        }
        if (zl_lib == NULL) {
                /* Allocate DBL library object */
                zl_lib = kzalloc(sizeof(struct dbll_library_obj), GFP_KERNEL);
                if (zl_lib == NULL) {
                        status = -ENOMEM;
                } else {
                        zl_lib->pos = 0;
                        /* Increment ref count to allow close on failure
                         * later on */
                        zl_lib->open_ref++;
                        zl_lib->target_obj = zl_target;
                        /* Keep a copy of the file name */
                        zl_lib->file_name = kzalloc(strlen(file) + 1,
                                                        GFP_KERNEL);
                        if (zl_lib->file_name == NULL) {
                                status = -ENOMEM;
                        } else {
                                strncpy(zl_lib->file_name, file,
                                        strlen(file) + 1);
                        }
                        zl_lib->sym_tab = NULL;
                }
        }
        /*
         *  Set up objects needed by the dynamic loader
         */
        if (status)
                goto func_cont;

        /* Stream */
        zl_lib->stream.dl_stream.read_buffer = dbll_read_buffer;
        zl_lib->stream.dl_stream.set_file_posn = dbll_set_file_posn;
        zl_lib->stream.lib = zl_lib;
        /* Symbol */
        zl_lib->symbol.dl_symbol.add_to_symbol_table = dbll_add_to_symbol_table;
        zl_lib->symbol.dl_symbol.find_matching_symbol = dbll_find_symbol;
        zl_lib->symbol.dl_symbol.purge_symbol_table = dbll_purge_symbol_table;
        zl_lib->symbol.dl_symbol.dload_allocate = allocate;
        zl_lib->symbol.dl_symbol.dload_deallocate = deallocate;
        zl_lib->symbol.dl_symbol.error_report = dbll_err_report;
        zl_lib->symbol.lib = zl_lib;
        /* Allocate */
        zl_lib->allocate.dl_alloc.dload_allocate = dbll_rmm_alloc;
        zl_lib->allocate.dl_alloc.dload_deallocate = rmm_dealloc;
        zl_lib->allocate.lib = zl_lib;
        /* Init */
        zl_lib->init.dl_init.connect = connect;
        zl_lib->init.dl_init.readmem = read_mem;
        zl_lib->init.dl_init.writemem = write_mem;
        zl_lib->init.dl_init.fillmem = fill_mem;
        zl_lib->init.dl_init.execute = execute;
        zl_lib->init.dl_init.release = release;
        zl_lib->init.lib = zl_lib;
        if (!status && zl_lib->fp == NULL)
                status = dof_open(zl_lib);

        zl_lib->pos = (*(zl_lib->target_obj->attrs.ftell)) (zl_lib->fp);
        (*(zl_lib->target_obj->attrs.fseek)) (zl_lib->fp, (long)0, SEEK_SET);
        /* Create a hash table for symbols if flag is set */
        if (zl_lib->sym_tab != NULL || !(flags & DBLL_SYMB))
                goto func_cont;

        zl_lib->sym_tab =
            gh_create(MAXBUCKETS, sizeof(struct dbll_symbol), name_hash,
                      name_match, sym_delete);
        if (zl_lib->sym_tab == NULL) {
                status = -ENOMEM;
        } else {
                /* Do a fake load to get symbols - set write func to no_op */
                zl_lib->init.dl_init.writemem = no_op;
                err = dynamic_open_module(&zl_lib->stream.dl_stream,
                                          &zl_lib->symbol.dl_symbol,
                                          &zl_lib->allocate.dl_alloc,
                                          &zl_lib->init.dl_init, 0,
                                          &zl_lib->dload_mod_obj);
                if (err != 0) {
                        status = -EILSEQ;
                } else {
                        /* Now that we have the symbol table, we can unload */
                        err = dynamic_unload_module(zl_lib->dload_mod_obj,
                                                    &zl_lib->symbol.dl_symbol,
                                                    &zl_lib->allocate.dl_alloc,
                                                    &zl_lib->init.dl_init);
                        if (err != 0)
                                status = -EILSEQ;

                        zl_lib->dload_mod_obj = NULL;
                }
        }
func_cont:
        if (!status) {
                if (zl_lib->open_ref == 1) {
                        /* First time opened - insert in list */
                        if (zl_target->head)
                                (zl_target->head)->prev = zl_lib;

                        zl_lib->prev = NULL;
                        zl_lib->next = zl_target->head;
                        zl_target->head = zl_lib;
                }
                *lib_obj = (struct dbll_library_obj *)zl_lib;
        } else {
                *lib_obj = NULL;
                if (zl_lib != NULL)
                        dbll_close((struct dbll_library_obj *)zl_lib);

        }

        dev_dbg(bridge, "%s: target: %p file: %s lib_obj: %p, status 0x%x\n",
                __func__, target, file, lib_obj, status);

        return status;
}

/*
 *  ======== dbll_read_sect ========
 *  Get the content of a COFF section.
 */
int dbll_read_sect(struct dbll_library_obj *lib, char *name,
                          char *buf, u32 size)
{
        struct dbll_library_obj *zl_lib = (struct dbll_library_obj *)lib;
        bool opened_doff = false;
        u32 byte_size;          /* size of bytes */
        u32 ul_sect_size;       /* size of section */
        const struct ldr_section_info *sect = NULL;
        int status = 0;

        /* If DOFF file is not open, we open it. */
        if (zl_lib != NULL) {
                if (zl_lib->fp == NULL) {
                        status = dof_open(zl_lib);
                        if (!status)
                                opened_doff = true;

                } else {
                        (*(zl_lib->target_obj->attrs.fseek)) (zl_lib->fp,
                                                              zl_lib->pos,
                                                              SEEK_SET);
                }
        } else {
                status = -EFAULT;
        }
        if (status)
                goto func_cont;

        byte_size = 1;
        if (!dload_get_section_info(zl_lib->desc, name, &sect)) {
                status = -ENXIO;
                goto func_cont;
        }
        /*
         * Ensure the supplied buffer size is sufficient to store
         * the section buf to be read.
         */
        ul_sect_size = sect->size * byte_size;
        /* Make sure size is even for good swap */
        if (ul_sect_size % 2)
                ul_sect_size++;

        /* Align size */
        ul_sect_size = DOFF_ALIGN(ul_sect_size);
        if (ul_sect_size > size) {
                status = -EPERM;
        } else {
                if (!dload_get_section(zl_lib->desc, sect, buf))
                        status = -EBADF;

        }
func_cont:
        if (opened_doff) {
                dof_close(zl_lib);
                opened_doff = false;
        }

        dev_dbg(bridge, "%s: lib: %p name: %s buf: %p size: 0x%x, "
                "status 0x%x\n", __func__, lib, name, buf, size, status);
        return status;
}

/*
 *  ======== dbll_unload ========
 */
void dbll_unload(struct dbll_library_obj *lib, struct dbll_attrs *attrs)
{
        struct dbll_library_obj *zl_lib = (struct dbll_library_obj *)lib;
        s32 err = 0;

        dev_dbg(bridge, "%s: lib: %p\n", __func__, lib);
        zl_lib->load_ref--;
        /* Unload only if reference count is 0 */
        if (zl_lib->load_ref != 0)
                return;

        zl_lib->target_obj->attrs = *attrs;
        if (zl_lib->dload_mod_obj) {
                err = dynamic_unload_module(zl_lib->dload_mod_obj,
                                            &zl_lib->symbol.dl_symbol,
                                            &zl_lib->allocate.dl_alloc,
                                            &zl_lib->init.dl_init);
                if (err != 0)
                        dev_dbg(bridge, "%s: failed: 0x%x\n", __func__, err);
        }
        /* remove symbols from symbol table */
        if (zl_lib->sym_tab != NULL) {
                gh_delete(zl_lib->sym_tab);
                zl_lib->sym_tab = NULL;
        }
        /* delete DOFF desc since it holds *lots* of host OS
         * resources */
        dof_close(zl_lib);
}

/*
 *  ======== dof_close ========
 */
static void dof_close(struct dbll_library_obj *zl_lib)
{
        if (zl_lib->desc) {
                dload_module_close(zl_lib->desc);
                zl_lib->desc = NULL;
        }
        /* close file */
        if (zl_lib->fp) {
                (zl_lib->target_obj->attrs.fclose) (zl_lib->fp);
                zl_lib->fp = NULL;
        }
}

/*
 *  ======== dof_open ========
 */
static int dof_open(struct dbll_library_obj *zl_lib)
{
        void *open = *(zl_lib->target_obj->attrs.fopen);
        int status = 0;

        /* First open the file for the dynamic loader, then open COF */
        zl_lib->fp =
            (void *)((dbll_f_open_fxn) (open)) (zl_lib->file_name, "rb");

        /* Open DOFF module */
        if (zl_lib->fp && zl_lib->desc == NULL) {
                (*(zl_lib->target_obj->attrs.fseek)) (zl_lib->fp, (long)0,
                                                      SEEK_SET);
                zl_lib->desc =
                    dload_module_open(&zl_lib->stream.dl_stream,
                                      &zl_lib->symbol.dl_symbol);
                if (zl_lib->desc == NULL) {
                        (zl_lib->target_obj->attrs.fclose) (zl_lib->fp);
                        zl_lib->fp = NULL;
                        status = -EBADF;
                }
        } else {
                status = -EBADF;
        }

        return status;
}

/*
 *  ======== name_hash ========
 */
static u16 name_hash(void *key, u16 max_bucket)
{
        u16 ret;
        u16 hash;
        char *name = (char *)key;

        hash = 0;

        while (*name) {
                hash <<= 1;
                hash ^= *name++;
        }

        ret = hash % max_bucket;

        return ret;
}

/*
 *  ======== name_match ========
 */
static bool name_match(void *key, void *sp)
{
        if ((key != NULL) && (sp != NULL)) {
                if (strcmp((char *)key, ((struct dbll_symbol *)sp)->name) ==
                    0)
                        return true;
        }
        return false;
}

/*
 *  ======== no_op ========
 */
static int no_op(struct dynamic_loader_initialize *thisptr, void *bufr,
                 ldr_addr locn, struct ldr_section_info *info, unsigned bytsize)
{
        return 1;
}

/*
 *  ======== sym_delete ========
 */
static void sym_delete(void *value)
{
        struct dbll_symbol *sp = (struct dbll_symbol *)value;

        kfree(sp->name);
}

/*
 *  Dynamic Loader Functions
 */

/* dynamic_loader_stream */
/*
 *  ======== dbll_read_buffer ========
 */
static int dbll_read_buffer(struct dynamic_loader_stream *this, void *buffer,
                            unsigned bufsize)
{
        struct dbll_stream *pstream = (struct dbll_stream *)this;
        struct dbll_library_obj *lib;
        int bytes_read = 0;

        lib = pstream->lib;
        if (lib != NULL) {
                bytes_read =
                    (*(lib->target_obj->attrs.fread)) (buffer, 1, bufsize,
                                                       lib->fp);
        }
        return bytes_read;
}

/*
 *  ======== dbll_set_file_posn ========
 */
static int dbll_set_file_posn(struct dynamic_loader_stream *this,
                              unsigned int pos)
{
        struct dbll_stream *pstream = (struct dbll_stream *)this;
        struct dbll_library_obj *lib;
        int status = 0;         /* Success */

        lib = pstream->lib;
        if (lib != NULL) {
                status = (*(lib->target_obj->attrs.fseek)) (lib->fp, (long)pos,
                                                            SEEK_SET);
        }

        return status;
}

/* dynamic_loader_sym */

/*
 *  ======== dbll_find_symbol ========
 */
static struct dynload_symbol *dbll_find_symbol(struct dynamic_loader_sym *this,
                                               const char *name)
{
        struct dynload_symbol *ret_sym;
        struct ldr_symbol *ldr_sym = (struct ldr_symbol *)this;
        struct dbll_library_obj *lib;
        struct dbll_sym_val *dbll_sym = NULL;
        bool status = false;    /* Symbol not found yet */

        lib = ldr_sym->lib;
        if (lib != NULL) {
                if (lib->target_obj->attrs.sym_lookup) {
                        /* Check current lib + base lib + dep lib +
                         * persistent lib */
                        status = (*(lib->target_obj->attrs.sym_lookup))
                            (lib->target_obj->attrs.sym_handle,
                             lib->target_obj->attrs.sym_arg,
                             lib->target_obj->attrs.rmm_handle, name,
                             &dbll_sym);
                } else {
                        /* Just check current lib for symbol */
                        status = dbll_get_addr((struct dbll_library_obj *)lib,
                                               (char *)name, &dbll_sym);
                        if (!status) {
                                status =
                                    dbll_get_c_addr((struct dbll_library_obj *)
                                                    lib, (char *)name,
                                                    &dbll_sym);
                        }
                }
        }

        if (!status && gbl_search)
                dev_dbg(bridge, "%s: Symbol not found: %s\n", __func__, name);

        ret_sym = (struct dynload_symbol *)dbll_sym;
        return ret_sym;
}

/*
 *  ======== find_in_symbol_table ========
 */
static struct dynload_symbol *find_in_symbol_table(struct dynamic_loader_sym
                                                   *this, const char *name,
                                                   unsigned moduleid)
{
        struct dynload_symbol *ret_sym;
        struct ldr_symbol *ldr_sym = (struct ldr_symbol *)this;
        struct dbll_library_obj *lib;
        struct dbll_symbol *sym;

        lib = ldr_sym->lib;
        sym = (struct dbll_symbol *)gh_find(lib->sym_tab, (char *)name);

        ret_sym = (struct dynload_symbol *)&sym->value;
        return ret_sym;
}

/*
 *  ======== dbll_add_to_symbol_table ========
 */
static struct dynload_symbol *dbll_add_to_symbol_table(struct dynamic_loader_sym
                                                       *this, const char *name,
                                                       unsigned module_id)
{
        struct dbll_symbol *sym_ptr = NULL;
        struct dbll_symbol symbol;
        struct dynload_symbol *dbll_sym = NULL;
        struct ldr_symbol *ldr_sym = (struct ldr_symbol *)this;
        struct dbll_library_obj *lib;
        struct dynload_symbol *ret;

        lib = ldr_sym->lib;

        /* Check to see if symbol is already defined in symbol table */
        if (!(lib->target_obj->attrs.base_image)) {
                gbl_search = false;
                dbll_sym = dbll_find_symbol(this, name);
                gbl_search = true;
                if (dbll_sym) {
                        redefined_symbol = true;
                        dev_dbg(bridge, "%s already defined in symbol table\n",
                                name);
                        return NULL;
                }
        }
        /* Allocate string to copy symbol name */
        symbol.name = kzalloc(strlen((char *const)name) + 1, GFP_KERNEL);
        if (symbol.name == NULL)
                return NULL;

        if (symbol.name != NULL) {
                /* Just copy name (value will be filled in by dynamic loader) */
                strncpy(symbol.name, (char *const)name,
                        strlen((char *const)name) + 1);

                /* Add symbol to symbol table */
                sym_ptr =
                    (struct dbll_symbol *)gh_insert(lib->sym_tab, (void *)name,
                                                    (void *)&symbol);
                if (sym_ptr == NULL)
                        kfree(symbol.name);

        }
        if (sym_ptr != NULL)
                ret = (struct dynload_symbol *)&sym_ptr->value;
        else

                ret = NULL;

        return ret;
}

/*
 *  ======== dbll_purge_symbol_table ========
 */
static void dbll_purge_symbol_table(struct dynamic_loader_sym *this,
                                    unsigned module_id)
{
        struct ldr_symbol *ldr_sym = (struct ldr_symbol *)this;
        struct dbll_library_obj *lib;

        lib = ldr_sym->lib;
        /* May not need to do anything */
}

/*
 *  ======== allocate ========
 */
static void *allocate(struct dynamic_loader_sym *this, unsigned memsize)
{
        struct ldr_symbol *ldr_sym = (struct ldr_symbol *)this;
        struct dbll_library_obj *lib;
        void *buf;

        lib = ldr_sym->lib;

        buf = kzalloc(memsize, GFP_KERNEL);

        return buf;
}

/*
 *  ======== deallocate ========
 */
static void deallocate(struct dynamic_loader_sym *this, void *mem_ptr)
{
        struct ldr_symbol *ldr_sym = (struct ldr_symbol *)this;
        struct dbll_library_obj *lib;

        lib = ldr_sym->lib;

        kfree(mem_ptr);
}

/*
 *  ======== dbll_err_report ========
 */
static void dbll_err_report(struct dynamic_loader_sym *this, const char *errstr,
                            va_list args)
{
        struct ldr_symbol *ldr_sym = (struct ldr_symbol *)this;
        struct dbll_library_obj *lib;
        char temp_buf[MAXEXPR];

        lib = ldr_sym->lib;
        vsnprintf((char *)temp_buf, MAXEXPR, (char *)errstr, args);
        dev_dbg(bridge, "%s\n", temp_buf);
}

/* dynamic_loader_allocate */

/*
 *  ======== dbll_rmm_alloc ========
 */
static int dbll_rmm_alloc(struct dynamic_loader_allocate *this,
                          struct ldr_section_info *info, unsigned align)
{
        struct dbll_alloc *dbll_alloc_obj = (struct dbll_alloc *)this;
        struct dbll_library_obj *lib;
        int status = 0;
        u32 mem_sect_type;
        struct rmm_addr rmm_addr_obj;
        s32 ret = true;
        unsigned stype = DLOAD_SECTION_TYPE(info->type);
        char *token = NULL;
        char *sz_sec_last_token = NULL;
        char *sz_last_token = NULL;
        char *sz_sect_name = NULL;
        char *psz_cur;
        s32 token_len = 0;
        s32 seg_id = -1;
        s32 req = -1;
        s32 count = 0;
        u32 alloc_size = 0;
        u32 run_addr_flag = 0;

        lib = dbll_alloc_obj->lib;

        mem_sect_type =
            (stype == DLOAD_TEXT) ? DBLL_CODE : (stype ==
                                                 DLOAD_BSS) ? DBLL_BSS :
            DBLL_DATA;

        /* Attempt to extract the segment ID and requirement information from
           the name of the section */
        token_len = strlen((char *)(info->name)) + 1;

        sz_sect_name = kzalloc(token_len, GFP_KERNEL);
        sz_last_token = kzalloc(token_len, GFP_KERNEL);
        sz_sec_last_token = kzalloc(token_len, GFP_KERNEL);

        if (sz_sect_name == NULL || sz_sec_last_token == NULL ||
            sz_last_token == NULL) {
                status = -ENOMEM;
                goto func_cont;
        }
        strncpy(sz_sect_name, (char *)(info->name), token_len);
        psz_cur = sz_sect_name;
        while ((token = strsep(&psz_cur, ":")) && *token != '\0') {
                strncpy(sz_sec_last_token, sz_last_token,
                        strlen(sz_last_token) + 1);
                strncpy(sz_last_token, token, strlen(token) + 1);
                token = strsep(&psz_cur, ":");
                count++;        /* optimizes processing */
        }
        /* If token is 0 or 1, and sz_sec_last_token is DYN_DARAM or DYN_SARAM,
           or DYN_EXTERNAL, then mem granularity information is present
           within the section name - only process if there are at least three
           tokens within the section name (just a minor optimization) */
        if (count >= 3) {
                status = kstrtos32(sz_last_token, 10, &req);
                if (status)
                        goto func_cont;
        }

        if ((req == 0) || (req == 1)) {
                if (strcmp(sz_sec_last_token, "DYN_DARAM") == 0) {
                        seg_id = 0;
                } else {
                        if (strcmp(sz_sec_last_token, "DYN_SARAM") == 0) {
                                seg_id = 1;
                        } else {
                                if (strcmp(sz_sec_last_token,
                                           "DYN_EXTERNAL") == 0)
                                        seg_id = 2;
                        }
                }
        }
func_cont:
        kfree(sz_sect_name);
        sz_sect_name = NULL;
        kfree(sz_last_token);
        sz_last_token = NULL;
        kfree(sz_sec_last_token);
        sz_sec_last_token = NULL;

        if (mem_sect_type == DBLL_CODE)
                alloc_size = info->size + GEM_L1P_PREFETCH_SIZE;
        else
                alloc_size = info->size;

        if (info->load_addr != info->run_addr)
                run_addr_flag = 1;
        /* TODO - ideally, we can pass the alignment requirement also
         * from here */
        if (lib != NULL) {
                status =
                    (lib->target_obj->attrs.alloc) (lib->target_obj->attrs.
                                                    rmm_handle, mem_sect_type,
                                                    alloc_size, align,
                                                    (u32 *) &rmm_addr_obj,
                                                    seg_id, req, false);
        }
        if (status) {
                ret = false;
        } else {
                /* RMM gives word address. Need to convert to byte address */
                info->load_addr = rmm_addr_obj.addr * DSPWORDSIZE;
                if (!run_addr_flag)
                        info->run_addr = info->load_addr;
                info->context = (u32) rmm_addr_obj.segid;
                dev_dbg(bridge, "%s: %s base = 0x%x len = 0x%x, "
                        "info->run_addr 0x%x, info->load_addr 0x%x\n",
                        __func__, info->name, info->load_addr / DSPWORDSIZE,
                        info->size / DSPWORDSIZE, info->run_addr,
                        info->load_addr);
        }
        return ret;
}

/*
 *  ======== rmm_dealloc ========
 */
static void rmm_dealloc(struct dynamic_loader_allocate *this,
                        struct ldr_section_info *info)
{
        struct dbll_alloc *dbll_alloc_obj = (struct dbll_alloc *)this;
        struct dbll_library_obj *lib;
        u32 segid;
        int status = 0;
        unsigned stype = DLOAD_SECTION_TYPE(info->type);
        u32 mem_sect_type;
        u32 free_size = 0;

        mem_sect_type =
            (stype == DLOAD_TEXT) ? DBLL_CODE : (stype ==
                                                 DLOAD_BSS) ? DBLL_BSS :
            DBLL_DATA;
        lib = dbll_alloc_obj->lib;
        /* segid was set by alloc function */
        segid = (u32) info->context;
        if (mem_sect_type == DBLL_CODE)
                free_size = info->size + GEM_L1P_PREFETCH_SIZE;
        else
                free_size = info->size;
        if (lib != NULL) {
                status =
                    (lib->target_obj->attrs.free) (lib->target_obj->attrs.
                                                   sym_handle, segid,
                                                   info->load_addr /
                                                   DSPWORDSIZE, free_size,
                                                   false);
        }
}

/* dynamic_loader_initialize */
/*
 *  ======== connect ========
 */
static int connect(struct dynamic_loader_initialize *this)
{
        return true;
}

/*
 *  ======== read_mem ========
 *  This function does not need to be implemented.
 */
static int read_mem(struct dynamic_loader_initialize *this, void *buf,
                    ldr_addr addr, struct ldr_section_info *info,
                    unsigned nbytes)
{
        struct dbll_init_obj *init_obj = (struct dbll_init_obj *)this;
        struct dbll_library_obj *lib;
        int bytes_read = 0;

        lib = init_obj->lib;
        /* Need bridge_brd_read function */
        return bytes_read;
}

/*
 *  ======== write_mem ========
 */
static int write_mem(struct dynamic_loader_initialize *this, void *buf,
                     ldr_addr addr, struct ldr_section_info *info,
                     unsigned bytes)
{
        struct dbll_init_obj *init_obj = (struct dbll_init_obj *)this;
        struct dbll_library_obj *lib;
        struct dbll_tar_obj *target_obj;
        struct dbll_sect_info sect_info;
        u32 mem_sect_type;
        bool ret = true;

        lib = init_obj->lib;
        if (!lib)
                return false;

        target_obj = lib->target_obj;

        mem_sect_type =
            (DLOAD_SECTION_TYPE(info->type) ==
             DLOAD_TEXT) ? DBLL_CODE : DBLL_DATA;
        if (target_obj && target_obj->attrs.write) {
                ret =
                    (*target_obj->attrs.write) (target_obj->attrs.input_params,
                                                addr, buf, bytes,
                                                mem_sect_type);

                if (target_obj->attrs.log_write) {
                        sect_info.name = info->name;
                        sect_info.sect_run_addr = info->run_addr;
                        sect_info.sect_load_addr = info->load_addr;
                        sect_info.size = info->size;
                        sect_info.type = mem_sect_type;
                        /* Pass the information about what we've written to
                         * another module */
                        (*target_obj->attrs.log_write) (target_obj->attrs.
                                                        log_write_handle,
                                                        &sect_info, addr,
                                                        bytes);
                }
        }
        return ret;
}

/*
 *  ======== fill_mem ========
 *  Fill bytes of memory at a given address with a given value by
 *  writing from a buffer containing the given value.  Write in
 *  sets of MAXEXPR (128) bytes to avoid large stack buffer issues.
 */
static int fill_mem(struct dynamic_loader_initialize *this, ldr_addr addr,
                    struct ldr_section_info *info, unsigned bytes, unsigned val)
{
        bool ret = true;
        char *pbuf;
        struct dbll_library_obj *lib;
        struct dbll_init_obj *init_obj = (struct dbll_init_obj *)this;

        lib = init_obj->lib;
        pbuf = NULL;
        /* Pass the NULL pointer to write_mem to get the start address of Shared
           memory. This is a trick to just get the start address, there is no
           writing taking place with this Writemem
         */
        if ((lib->target_obj->attrs.write) != (dbll_write_fxn) no_op)
                write_mem(this, &pbuf, addr, info, 0);
        if (pbuf)
                memset(pbuf, val, bytes);

        return ret;
}

/*
 *  ======== execute ========
 */
static int execute(struct dynamic_loader_initialize *this, ldr_addr start)
{
        struct dbll_init_obj *init_obj = (struct dbll_init_obj *)this;
        struct dbll_library_obj *lib;
        bool ret = true;

        lib = init_obj->lib;
        /* Save entry point */
        if (lib != NULL)
                lib->entry = (u32) start;

        return ret;
}

/*
 *  ======== release ========
 */
static void release(struct dynamic_loader_initialize *this)
{
}

#ifdef CONFIG_TIDSPBRIDGE_BACKTRACE
/**
 *  find_symbol_context - Basic symbol context structure
 * @address:            Symbol Address
 * @offset_range:               Offset range where the search for the DSP symbol
 *                      started.
 * @cur_best_offset:    Best offset to start looking for the DSP symbol
 * @sym_addr:           Address of the DSP symbol
 * @name:               Symbol name
 *
 */
struct find_symbol_context {
        /* input */
        u32 address;
        u32 offset_range;
        /* state */
        u32 cur_best_offset;
        /* output */
        u32 sym_addr;
        char name[120];
};

/**
 * find_symbol_callback() - Validates symbol address and copies the symbol name
 *                      to the user data.
 * @elem:               dsp library context
 * @user_data:          Find symbol context
 *
 */
void find_symbol_callback(void *elem, void *user_data)
{
        struct dbll_symbol *symbol = elem;
        struct find_symbol_context *context = user_data;
        u32 symbol_addr = symbol->value.value;
        u32 offset = context->address - symbol_addr;

        /*
         * Address given should be greater than symbol address,
         * symbol address should be  within specified range
         * and the offset should be better than previous one
         */
        if (context->address >= symbol_addr && symbol_addr < (u32)-1 &&
                offset < context->cur_best_offset) {
                context->cur_best_offset = offset;
                context->sym_addr = symbol_addr;
                strlcpy(context->name, symbol->name, sizeof(context->name));
        }

        return;
}

/**
 * dbll_find_dsp_symbol() - This function retrieves the dsp symbol from the dsp binary.
 * @zl_lib:             DSP binary obj library pointer
 * @address:            Given address to find the dsp symbol
 * @offset_range:               offset range to look for dsp symbol
 * @sym_addr_output:    Symbol Output address
 * @name_output:                String with the dsp symbol
 *
 *      This function retrieves the dsp symbol from the dsp binary.
 */
bool dbll_find_dsp_symbol(struct dbll_library_obj *zl_lib, u32 address,
                                u32 offset_range, u32 *sym_addr_output,
                                char *name_output)
{
        bool status = false;
        struct find_symbol_context context;

        context.address = address;
        context.offset_range = offset_range;
        context.cur_best_offset = offset_range;
        context.sym_addr = 0;
        context.name[0] = '\0';

        gh_iterate(zl_lib->sym_tab, find_symbol_callback, &context);

        if (context.name[0]) {
                status = true;
                strcpy(name_output, context.name);
                *sym_addr_output = context.sym_addr;
        }

        return status;
}
#endif