/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2008, Jordan Crouse <jordan@cosmicpenguin.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
 */

#include <types.h>
#include <string.h>
#include <console/console.h>
#include <cbfs.h>
#include <lib.h>

#ifndef CONFIG_BIG_ENDIAN
#define ntohl(x) ( ((x&0xff)<<24) | ((x&0xff00)<<8) | \
                ((x&0xff0000) >> 8) | ((x&0xff000000) >> 24) )
#else
#define ntohl(x) (x)
#endif

int cbfs_decompress(int algo, void *src, void *dst, int len)
{
        switch(algo) {
        case CBFS_COMPRESS_NONE:
                memcpy(dst, src, len);
                return 0;

        case CBFS_COMPRESS_LZMA:
                if (!ulzma(src, dst)) {
                        printk_err("CBFS: LZMA decompression failed!\n");
                        return -1;
                }
                return 0;

        default:
                printk_info( "CBFS:  Unknown compression type %d\n", algo);
                return -1;
        }
}

int cbfs_check_magic(struct cbfs_file *file)
{
        return !strcmp(file->magic, CBFS_FILE_MAGIC) ? 1 : 0;
}

struct cbfs_header *cbfs_master_header(void)
{
        struct cbfs_header *header;

        void *ptr = (void *)*((unsigned long *) CBFS_HEADPTR_ADDR);
        printk_spew("Check CBFS header at %p\n", ptr);
        header = (struct cbfs_header *) ptr;

        printk_spew("magic is %08x\n", ntohl(header->magic));
        if (ntohl(header->magic) != CBFS_HEADER_MAGIC) {
                printk_err("ERROR: No valid CBFS header found!\n");
                return NULL;
        }

        printk_spew("Found CBFS header at %p\n", ptr);
        return header;
}

struct cbfs_file *cbfs_find(const char *name)
{
        struct cbfs_header *header = cbfs_master_header();
        unsigned long offset;

        if (header == NULL)
                return NULL;
        offset = 0 - ntohl(header->romsize) + ntohl(header->offset);

        int align= ntohl(header->align);

        while(1) {
                struct cbfs_file *file = (struct cbfs_file *) offset;
                if (!cbfs_check_magic(file)) return NULL;
                printk_spew("Check %s\n", CBFS_NAME(file));
                if (!strcmp(CBFS_NAME(file), name))
                        return file;

                int flen = ntohl(file->len);
                int foffset = ntohl(file->offset);
                printk_spew("CBFS: follow chain: %p + %x + %x + align -> ", (void *)offset, foffset, flen);

                unsigned long oldoffset = offset;
                offset = ALIGN(offset + foffset + flen, align);
                printk_spew("%p\n", (void *)offset);
                if (offset <= oldoffset) return NULL;

                if (offset < 0xFFFFFFFF - ntohl(header->romsize))
                        return NULL;
        }
}

struct cbfs_stage *cbfs_find_file(const char *name, int type)
{
        struct cbfs_file *file = cbfs_find(name);

        if (file == NULL) {
                printk_info( "CBFS:  Could not find file %s\n",
                       name);
                return NULL;
        }

        if (ntohl(file->type) != type) {
                printk_info( "CBFS:  File %s is of type %x instead of"
                       "type %x\n", name, file->type, type);

                return NULL;
        }

        return (void *) CBFS_SUBHEADER(file);
}

static int tohex4(unsigned int c)
{
        return (c<=9)?(c+'0'):(c-10+'a');
}

static void tohex16(unsigned int val, char* dest)
{
        dest[0]=tohex4(val>>12);
        dest[1]=tohex4((val>>8) & 0xf);
        dest[2]=tohex4((val>>4) & 0xf);
        dest[3]=tohex4(val & 0xf);
}

void *cbfs_load_optionrom(u16 vendor, u16 device, void * dest)
{
        char name[17]="pciXXXX,XXXX.rom";
        struct cbfs_optionrom *orom;
        u8 *src;

        tohex16(vendor, name+3);
        tohex16(device, name+8);

        orom = (struct cbfs_optionrom *)
                cbfs_find_file(name, CBFS_TYPE_OPTIONROM);

        if (orom == NULL)
                return NULL;

        /* They might have specified a dest address. If so, we can decompress. 
         * If not, there's not much hope of decompressing or relocating the rom.
         * in the common case, the expansion rom is uncompressed, we
         * pass 0 in for the dest, and all we have to do is find the rom and 
         * return a pointer to it. 
         */

        /* BUG: the cbfstool is (not yet) including a cbfs_optionrom header */
        src = ((unsigned char *) orom); // + sizeof(struct cbfs_optionrom);

        if (! dest)
                return src;

        if (cbfs_decompress(ntohl(orom->compression),
                             src,
                             dest,
                             ntohl(orom->len)))
                return NULL;

        return dest;
}

void * cbfs_load_stage(const char *name)
{
        struct cbfs_stage *stage = (struct cbfs_stage *)
                cbfs_find_file(name, CBFS_TYPE_STAGE);
        /* this is a mess. There is no ntohll. */
        /* for now, assume compatible byte order until we solve this. */
        u32 entry;

        if (stage == NULL)
                return (void *) -1;

        printk_info("Stage: loading %s @ 0x%x (%d bytes), entry @ 0x%llx\n", 
                        name,
                        (u32) stage->load, stage->memlen, 
                        stage->entry);
        memset((void *) (u32) stage->load, 0, stage->memlen);

        if (cbfs_decompress(stage->compression,
                             ((unsigned char *) stage) +
                             sizeof(struct cbfs_stage),
                             (void *) (u32) stage->load,
                             stage->len))
                return (void *) -1;

        printk_debug("Stage: done loading.\n");

        entry = stage->entry;
        // entry = ntohl((u32) stage->entry);

        return (void *) entry;
}

void * cbfs_get_file(const char *name)
{
        return cbfs_find(name);
}

int cbfs_execute_stage(const char *name)
{
        struct cbfs_stage *stage = (struct cbfs_stage *)
                cbfs_find_file(name, CBFS_TYPE_STAGE);

        if (stage == NULL)
                return 1;

        if (ntohl(stage->compression) != CBFS_COMPRESS_NONE) {
                printk_info( "CBFS:  Unable to run %s:  Compressed file"
                       "Not supported for in-place execution\n", name);
                return 1;
        }

        /* FIXME: This isn't right */
        printk_info( "CBFS: run @ %p\n", (void *) ntohl((u32) stage->entry));
        return run_address((void *) ntohl((u32) stage->entry));
}

/**
 * run_address is passed the address of a function taking no parameters and
 * jumps to it, returning the result. 
 * @param f the address to call as a function. 
 * returns value returned by the function. 
 */

int run_address(void *f)
{
        int (*v) (void);
        v = f;
        return v();
}