cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

target_arch_cpu.c (1896B)

      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