| 1 | /* |
| 2 | * i386 cpu related code |
| 3 | * |
| 4 | * Copyright (c) 2013 Stacey D. Son |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 7 | */ |
| 8 | |
| 9 | #include "qemu/osdep.h" |
| 10 | |
| 11 | #include "cpu.h" |
| 12 | #include "qemu.h" |
| 13 | #include "qemu/timer.h" |
| 14 | |
| 15 | #include "target_arch.h" |
| 16 | |
| 17 | static uint64_t *idt_table; |
| 18 | |
| 19 | uint64_t cpu_get_tsc(CPUX86State *env) |
| 20 | { |
| 21 | return cpu_get_host_ticks(); |
| 22 | } |
| 23 | |
| 24 | void bsd_i386_write_dt(void *ptr, unsigned long addr, unsigned long limit, |
| 25 | int flags) |
| 26 | { |
| 27 | unsigned int e1, e2; |
| 28 | uint32_t *p; |
| 29 | e1 = (addr << 16) | (limit & 0xffff); |
| 30 | e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000); |
| 31 | e2 |= flags; |
| 32 | p = ptr; |
| 33 | p[0] = tswap32(e1); |
| 34 | p[1] = tswap32(e2); |
| 35 | } |
| 36 | |
| 37 | |
| 38 | static void set_gate(void *ptr, unsigned int type, unsigned int dpl, |
| 39 | uint32_t addr, unsigned int sel) |
| 40 | { |
| 41 | uint32_t *p, e1, e2; |
| 42 | e1 = (addr & 0xffff) | (sel << 16); |
| 43 | e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8); |
| 44 | p = ptr; |
| 45 | p[0] = tswap32(e1); |
| 46 | p[1] = tswap32(e2); |
| 47 | } |
| 48 | |
| 49 | /* only dpl matters as we do only user space emulation */ |
| 50 | void bsd_i386_set_idt(int n, unsigned int dpl) |
| 51 | { |
| 52 | set_gate(idt_table + n, 0, dpl, 0, 0); |
| 53 | } |
| 54 | |
| 55 | void bsd_i386_set_idt_base(uint64_t base) |
| 56 | { |
| 57 | idt_table = g2h_untagged(base); |
| 58 | } |
| 59 |