LXR qemu/bsd-user/i386/target_arch

   1/*
   2 *  i386 cpu related code
   3 *
   4 * Copyright (c) 2013 Stacey Son <sson@FreeBSD.org>
   5 *
   6 *  This program is free software; you can redistribute it and/or modify
   7 *  it under the terms of the GNU General Public License as published by
   8 *  the Free Software Foundation; either version 2 of the License, or
   9 *  (at your option) any later version.
  10 *
  11 *  This program is distributed in the hope that it will be useful,
  12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *  GNU General Public License for more details.
  15 *
  16 *  You should have received a copy of the GNU General Public License
  17 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20#include <sys/types.h>
  21
  22#include "qemu/osdep.h"
  23#include "cpu.h"
  24#include "qemu.h"
  25#include "qemu/timer.h"
  26
  27#include "target_arch.h"
  28
  29static uint64_t *idt_table;
  30
  31uint64_t cpu_get_tsc(CPUX86State *env)
  32{
  33    return cpu_get_host_ticks();
  34}
  35
  36void bsd_i386_write_dt(void *ptr, unsigned long addr, unsigned long limit,
  37                     int flags)
  38{
  39    unsigned int e1, e2;
  40    uint32_t *p;
  41    e1 = (addr << 16) | (limit & 0xffff);
  42    e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000);
  43    e2 |= flags;
  44    p = ptr;
  45    p[0] = tswap32(e1);
  46    p[1] = tswap32(e2);
  47}
  48
  49
  50static void set_gate(void *ptr, unsigned int type, unsigned int dpl,
  51                     uint32_t addr, unsigned int sel)
  52{
  53    uint32_t *p, e1, e2;
  54    e1 = (addr & 0xffff) | (sel << 16);
  55    e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8);
  56    p = ptr;
  57    p[0] = tswap32(e1);
  58    p[1] = tswap32(e2);
  59}
  60
  61/* only dpl matters as we do only user space emulation */
  62void bsd_i386_set_idt(int n, unsigned int dpl)
  63{
  64    set_gate(idt_table + n, 0, dpl, 0, 0);
  65}
  66
  67void bsd_i386_set_idt_base(uint64_t base)
  68{
  69    idt_table = g2h_untagged(base);
  70}
  71
  72