/*      $NetBSD: load.cpp,v 1.15 2008/04/28 20:23:20 martin Exp $       */

/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by UCHIYAMA Yasushi.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include <load.h>
#include <exec_coff.h>
#undef DPRINTF // trash coff_machdep.h 's define.

#include <console.h>
#include <memory.h>
#include <file.h>

#include <exec_elf.h>

Loader::Loader(Console *&cons, MemoryManager *&mem)
       : _mem(mem), _cons(cons)
{
       _file = 0;
       _page_tag_start = 0;
}

LoaderOps
Loader::objectFormat(File &file)
{
       union {
               Elf_Ehdr elf;
               coff_exechdr coff;
       } header;
       file.read(reinterpret_cast<void *>(&header), sizeof(header), 0);

       if (header.elf.e_ident[EI_MAG0] == ELFMAG0 &&
           header.elf.e_ident[EI_MAG1] == ELFMAG1 &&
           header.elf.e_ident[EI_MAG2] == ELFMAG2 &&
           header.elf.e_ident[EI_MAG3] == ELFMAG3)
               return LOADER_ELF;
#ifdef COFF_BADMAG
       if (!COFF_BADMAG(&header.coff.f))
               return LOADER_COFF;
#endif // COFF_BADMAG

       return LOADER_UNKNOWN;
}

BOOL
Loader::loadExtData(void)
{
       size_t sz;
       vaddr_t kv;

       sz = _file->realsize();
       kv = ROUND(_kernend, static_cast <vsize_t>(KERNEL_PAGE_SIZE));

       DPRINTF((TEXT("[file system image]\n")));
       _load_segment(kv, sz, 0, sz);

       return _load_success();
}

void
Loader::loadEnd(void)
{
       /* tag chain end */
       _load_segment_end();
}

void
Loader::tagDump(int n)
{
#ifdef PAGE_LINK_DUMP
       struct PageTag *p, *op;
       int i = 0;

       DPRINTF((TEXT("page tag start physical address: 0x%08x\n"),
           _page_tag_start));
       p = reinterpret_cast <struct PageTag *>(_page_tag_start);
       do  {
               if (i < n || p->src == ~0)
                       DPRINTF((TEXT("[%d] next 0x%08x src 0x%08x dst 0x%08x sz 0x%x\n"),
                           i, p->next, p->src, p->dst, p->sz));
               else if (i == n)
                       DPRINTF((TEXT("[...]\n")));
               op = p;
               i++;
       } while ((p = reinterpret_cast <struct PageTag *>(p->next)) != ~0);

       DPRINTF((TEXT("[%d(last)] next 0x%08x src 0x%08x dst 0x%08x sz 0x%x\n"),
           i - 1, op->next, op->src, op->dst, op->sz));
#endif // PAGE_LINK_DUMP
}

paddr_t
Loader::tagStart(void)
{
       return _page_tag_start;
}

void
Loader::_load_segment_start(void)
{
       vaddr_t v;
       paddr_t p;

       _error = FALSE;
       _nload_link = _n0clr_link = 0;
       _tpsz = _mem->getTaggedPageSize();

       // start of chain.
       if (!_mem->getTaggedPage(v, p, &_pvec_clr, _pvec_clr_paddr))
               _error = TRUE;
#ifdef PAGE_LINK_DUMP
       _page_tag_start = (uint32_t)_pvec_clr;
#else
       _page_tag_start = _pvec_clr_paddr;
#endif
       _pvec_prev = _pvec_clr++;
       _pvec_clr_paddr += sizeof(struct PageTag);
}

void
Loader::_load_segment_end(void)
{
       _opvec_prev->next = ~0; // terminate
       DPRINTF((TEXT("load link %d, zero clear link %d\n"),
           _nload_link, _n0clr_link));
}

void
Loader::_load_segment(vaddr_t kv, vsize_t memsz, off_t fileofs, size_t filesz)
{
       int j, n;
       vaddr_t kv_start = kv;

       DPRINTF((TEXT("\t->load 0x%08x+0x%08x=0x%08x ofs=0x%08x+0x%x\n"),
           kv, memsz, kv + memsz, fileofs, filesz));
       _kernend = kv + memsz;

       if (filesz) {
               n = filesz / _tpsz;
               for (j = 0; j < n; j++) {
                       _opvec_prev = _pvec_prev;
                       _pvec_prev = _load_page(kv, fileofs,
                           _tpsz, _pvec_prev);
                       kv += _tpsz;
                       fileofs += _tpsz;
                       ++_nload_link;
               }
               size_t rest = filesz % _tpsz;
               if (rest) {
                       _opvec_prev = _pvec_prev;
                       _pvec_prev = _load_page(kv, fileofs, rest, _pvec_prev);
                       ++_nload_link;
               }
       }

       // zero clear tag
       if (filesz < memsz) {
               _pvec_prev->src = ~0;
               _pvec_prev->dst = kv_start + filesz;
               _pvec_prev->sz = memsz - filesz;
#ifdef PAGE_LINK_DUMP
               _pvec_prev->next = (uint32_t)_pvec_clr;
#else
               _pvec_prev->next = ptokv(_pvec_clr_paddr);
#endif
               DPRINTF((TEXT("\t->zero 0x%08x+0x%08x=0x%08x\n"),
                   _pvec_prev->dst, _pvec_prev->sz,
                   _pvec_prev->dst + _pvec_prev->sz));
               _opvec_prev = _pvec_prev;
               _pvec_prev = _pvec_clr++;
               _pvec_clr_paddr += sizeof(struct PageTag);
               ++_n0clr_link;
       }
}

void
Loader::_load_memory(vaddr_t kv, vsize_t memsz, void *data)
{
       struct PageTag *pvec;
       paddr_t p, pvec_paddr;
       vaddr_t v;
       vaddr_t dst;
       vsize_t remsz;

       DPRINTF((TEXT("\t->load 0x%08x+0x%08x=0x%08x\n"),
           kv, memsz, kv + memsz));

       dst = kv;
       remsz = memsz;
       while (remsz > 0) {
               _opvec_prev = _pvec_prev;
               if (!_mem->getTaggedPage(v, p, &pvec, pvec_paddr))
                       _error = TRUE;

               vsize_t tocopy = (remsz < _tpsz) ? remsz : _tpsz;
               memcpy((void *)v, data, tocopy);
               _pvec_prev->src = ptokv(p);
               _pvec_prev->dst = dst;
               _pvec_prev->sz = tocopy;
#ifdef PAGE_LINK_DUMP
               _pvec_prev->next = (uint32_t)pvec;
#else
               _pvec_prev->next = ptokv(pvec_paddr);
#endif
               data = (char *)data + tocopy;
               dst += tocopy;
               remsz -= tocopy;

               _pvec_prev = pvec;
               ++_nload_link;
       }

       _kernend = kv + memsz;
}

struct PageTag *
Loader::_load_page(vaddr_t kv, off_t ofs, size_t sz, struct PageTag *prev)
{
       struct PageTag *pvec;
       paddr_t p, pvec_paddr;
       vaddr_t v;

       if (!_mem->getTaggedPage(v, p, &pvec, pvec_paddr))
               _error = TRUE;
       _file->read((void *)v, sz, ofs);
       prev->src = ptokv(p);
       prev->dst = kv;
       prev->sz = sz;
#ifdef PAGE_LINK_DUMP
       prev->next = (uint32_t)pvec;
#else
       prev->next = ptokv(pvec_paddr);
#endif

       return pvec;
}

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