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