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 "qemu/osdep.h"
21
22 #include "cpu.h"
23 #include "qemu.h"
24 #include "qemu/timer.h"
25
26 #include "target_arch.h"
27
28 static uint64_t *idt_table;
29
cpu_get_tsc(CPUX86State * env)30 uint64_t cpu_get_tsc(CPUX86State *env)
31 {
32 return cpu_get_host_ticks();
33 }
34
bsd_i386_write_dt(void * ptr,unsigned long addr,unsigned long limit,int flags)35 void bsd_i386_write_dt(void *ptr, unsigned long addr, unsigned long limit,
36 int flags)
37 {
38 unsigned int e1, e2;
39 uint32_t *p;
40 e1 = (addr << 16) | (limit & 0xffff);
41 e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000);
42 e2 |= flags;
43 p = ptr;
44 p[0] = tswap32(e1);
45 p[1] = tswap32(e2);
46 }
47
48
set_gate(void * ptr,unsigned int type,unsigned int dpl,uint32_t addr,unsigned int sel)49 static void set_gate(void *ptr, unsigned int type, unsigned int dpl,
50 uint32_t addr, unsigned int sel)
51 {
52 uint32_t *p, e1, e2;
53 e1 = (addr & 0xffff) | (sel << 16);
54 e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8);
55 p = ptr;
56 p[0] = tswap32(e1);
57 p[1] = tswap32(e2);
58 }
59
60 /* only dpl matters as we do only user space emulation */
bsd_i386_set_idt(int n,unsigned int dpl)61 void bsd_i386_set_idt(int n, unsigned int dpl)
62 {
63 set_gate(idt_table + n, 0, dpl, 0, 0);
64 }
65
bsd_i386_set_idt_base(uint64_t base)66 void bsd_i386_set_idt_base(uint64_t base)
67 {
68 idt_table = g2h_untagged(base);
69 }
70
71