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