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// vim:set ft=cpp: -*- Mode: C++ -*-
/*
 * (c) 2008-2009 Author(s)
 *     economic rights: Technische Universität Dresden (Germany)
 *
 * License: see LICENSE.spdx (in this directory or the directories above)
 */
#pragma once
 
#include <l4/cxx/static_vector>
#include <l4/sys/kip.h>
 
/* C++ version of memory descriptors */

 
namespace L4
{
  namespace Kip
  {
    class Mem_desc
    {
    public:
      enum Mem_type
      {
        Undefined    = 0x0,  
        Conventional = 0x1,  
        Reserved     = 0x2,  
        Dedicated    = 0x3,  
        Shared       = 0x4,  
        Kmem         = 0x5,  
 
        // 0x7 is internally used by the kernel
 
        Info         = 0xd,  
        Bootloader   = 0xe,  
        Arch         = 0xf   
      };

      enum Info_sub_type
      {
        Info_acpi_rsdp = 0, 
 
        Reserved_kernel = 0, 
        Reserved_heap   = 1, 
        Reserved_mmio   = 2, 
      };

      enum Arch_sub_type_common
      {
        Arch_acpi_tables  = 3,  
        Arch_acpi_nvs     = 4,  
        Arch_cpu_fw       = 5,  
      };
 
    private:
      unsigned long _l, _h;
 
    public:
      static Mem_desc *first(l4_kernel_info_t *kip) noexcept
      {
        return reinterpret_cast<Mem_desc *>(reinterpret_cast<char *>(kip) + kip->mem_descs);
      }
 
      static Mem_desc const *first(l4_kernel_info_t const *kip) noexcept
      {
        char const *addr = reinterpret_cast<char const *>(kip) + kip->mem_descs;
        return reinterpret_cast<Mem_desc const *>(addr);
      }

      static unsigned long count(l4_kernel_info_t const *kip) noexcept
      {
        return kip->mem_descs_num;
      }

      static void count(l4_kernel_info_t *kip, unsigned count) noexcept
      {
        kip->mem_descs_num = count;
      }

      static inline cxx::static_vector<Mem_desc const> all(l4_kernel_info_t const *kip)
      {
        return cxx::static_vector<Mem_desc const>(Mem_desc::first(kip),
                                                  Mem_desc::count(kip));
      }

      static inline cxx::static_vector<Mem_desc> all(l4_kernel_info_t *kip)
      {
        return cxx::static_vector<Mem_desc>(Mem_desc::first(kip),
                                            Mem_desc::count(kip));
      }

      Mem_desc(unsigned long start, unsigned long end,
               Mem_type t, unsigned char st = 0, bool virt = false,
               bool eager = false) noexcept
      : _l((start & ~0x3ffUL) | (t & 0x0f) | ((st << 4) & 0x0f0)
           | (virt ? 0x0200 : 0x0) | (eager ? 0x100 : 0x0)), _h(end | 0x3ffUL)
      {}

      unsigned long start() const noexcept { return _l & ~0x3ffUL; }

      unsigned long end() const noexcept { return _h | 0x3ffUL; }

      unsigned long size() const noexcept { return end() + 1 - start(); }

      Mem_type type() const noexcept
      {
        return static_cast<Mem_type>(_l & 0x0f);
      }

      unsigned char sub_type() const noexcept { return (_l >> 4) & 0x0f; }

      unsigned is_virtual() const noexcept { return _l & 0x200; }

      unsigned eager_map() const noexcept { return _l & 0x100; }

      void set(unsigned long start, unsigned long end,
               Mem_type t, unsigned char st = 0, bool virt = false,
               bool eager = false) noexcept
      {
        _l = (start & ~0x3ffUL) | (t & 0x0f) | ((st << 4) & 0x0f0)
             | (virt?0x0200:0x0) | (eager ? 0x0100 : 0x0);
 
        _h = end | 0x3ffUL;
      }
 
    };
  };
};