kaneton/kaneton/machine/architecture/ia32/educational/idt.c

/*
 * ---------- header ----------------------------------------------------------
 *
 * project       kaneton
 *
 * license       kaneton
 *
 * file          /home/mycure/kane...hine/architecture/ia32/educational/idt.c
 *
 * created       renaud voltz   [sun feb 12 02:02:19 2006]
 * updated       julien quintard   [mon apr 11 13:44:56 2011]
 */

/*
 * ---------- information -----------------------------------------------------
 *
 * this file provides functionalities for managing the IDT - Interrupt
 * Descriptor Table.
 *
 * for more information regarding the handlers triggered through the IDT,
 * please have a look at the handler.c file.
 */

/*
 * ---------- includes --------------------------------------------------------
 */

#include <kaneton.h>

/*
 * ---------- globals ---------------------------------------------------------
 */

at_idte	_idt[ARCHITECTURE_IDT_SIZE];

/*
 * ---------- functions -------------------------------------------------------
 */

/* FIXME[complete if necessary] */

t_error	architecture_idt_dump(void)
{
  t_uint16		i;

  module_call(console, message,
	      '#', "IDT: table(0x%08x) size(%u)\n",
	      _idt, ARCHITECTURE_IDT_SIZE);

  for (i = 0; i < ARCHITECTURE_IDT_SIZE; i++)
    {
      t_privilege	privilege;
      t_paddr		offset;
      char*		type;
      char		flag;

      if (!(_idt[i] & ARCHITECTURE_IDTE_PRESENT))
	continue;

      offset = ARCHITECTURE_IDTE_OFFSET_GET(_idt[i]);

      privilege = ARCHITECTURE_IDTE_DPL_GET(_idt[i]);

      if (_idt[i] & ARCHITECTURE_IDTE_32BIT)
	flag = 's';
      else
	flag = '.';

      if ((_idt[i] & ARCHITECTURE_IDTE_TRAP) == ARCHITECTURE_IDTE_TRAP)
	type = "trap";
      else if ((_idt[i] & ARCHITECTURE_IDTE_INTERRUPT) == ARCHITECTURE_IDTE_INTERRUPT)
	type = "interrupt";
      else
	type = "task";

      module_call(console, message,
		  '#', "  %u: offset(0x%08x) type(%s) "
		  "privilege(%u) flags(%c)\n",
		  i, offset, type, privilege, flag);
    }

  MACHINE_LEAVE();
}

t_error			architecture_idt_import(void)
{
  as_idtr lidt;

  lidt.limit = ARCHITECTURE_IDT_SIZE * sizeof (at_idte);
  lidt.base = (t_paddr) &_idt;

  ARCHITECTURE_LIDT(lidt);

  platform_pic_initialize();

  MACHINE_LEAVE();
}

t_error			architecture_idt_enable(void)
{
  ARCHITECTURE_STI();

  MACHINE_LEAVE();
}

t_error			architecture_idt_disable(void)
{
  ARCHITECTURE_CLI();

  MACHINE_LEAVE();
}

t_error	architecture_idt_insert(t_uint16	index,
				t_paddr		offset,
				t_flags		flags)
{
  if (index >= ARCHITECTURE_IDT_SIZE)
    MACHINE_ESCAPE("out-of-bound insertion");

  if (_idt[index] & ARCHITECTURE_IDTE_PRESENT)
    MACHINE_ESCAPE("the IDT entry to update is already in use");

  t_uint16     sselector;
  architecture_gdt_selector(1, ARCHITECTURE_PRIVILEGE_RING0, &sselector);

  _idt[index] =
    ARCHITECTURE_IDTE_INTERRUPT |
    ARCHITECTURE_IDTE_PRESENT |
    ARCHITECTURE_IDTE_OFFSET_SET(offset) |
    ARCHITECTURE_IDTE_SEGMENT_SET(sselector) |
    ARCHITECTURE_IDTE_32BIT |
    flags;

  MACHINE_LEAVE();
}

t_error	architecture_idt_reserve(t_paddr	base,
				 t_flags	flags,
				 t_uint16*	index)
{
  t_uint16		i;

  if (index == NULL)
    MACHINE_ESCAPE("the 'index' argument is null");

  *index = 0;

  for (i = 0; i < ARCHITECTURE_IDT_SIZE; i++)
    if (!(_idt[i] & ARCHITECTURE_IDTE_PRESENT))
      {
	*index = i;

	break;
      }

  if (architecture_idt_insert(*index, base, flags) != ERROR_OK)
    MACHINE_ESCAPE("unable to insert the segment in the IDT");

  MACHINE_LEAVE();
}

t_error	architecture_idt_delete(t_uint16	index)
{
  if (index >= ARCHITECTURE_IDT_SIZE)
    MACHINE_ESCAPE("out-of-bound insertion");

  if (!(_idt[index] & ARCHITECTURE_IDTE_PRESENT))
    MACHINE_ESCAPE("the IDT entry to delete is not present");

  memset(&_idt[index], 0x0, sizeof (at_idte));

  MACHINE_LEAVE();
}

t_error	architecture_idt_build(void)
{
  memset(_idt, 0x0, ARCHITECTURE_IDT_SIZE * sizeof (at_idte));

  MACHINE_LEAVE();
}