bsd-user/i386/target_arch_cpu.c

   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
  29 static uint64_t *idt_table;
  30
  31 uint64_t cpu_get_tsc(CPUX86State *env)
  32 {
  33     return cpu_get_host_ticks();
  34 }
  35
  36 void 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
  50 static 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 */
  62 void bsd_i386_set_idt(int n, unsigned int dpl)
  63 {
  64     set_gate(idt_table + n, 0, dpl, 0, 0);
  65 }
  66
  67 void bsd_i386_set_idt_base(uint64_t base)
  68 {
  69     idt_table = g2h_untagged(base);
  70 }
  71