1/* $OpenBSD: cpu_full.h,v 1.3 2018/06/22 13:21:14 bluhm Exp $ */
2/*
3 * Copyright (c) 2018 Philip Guenther <guenther@openbsd.org>
4 * Copyright (c) 2018 Hans-Joerg Hoexer <hshoexer@genua.de>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#ifndef _MACHINE_CPU_FULL_H_
20#define _MACHINE_CPU_FULL_H_
21
22#include <sys/param.h> /* offsetof, PAGE_SIZE */
23#include <machine/segments.h>
24#include <machine/tss.h>
25
26struct cpu_info_full {
27 /* page mapped kRO in u-k */
28 union {
29 struct {
30 struct i386tss uu_tss;
31 struct i386tss uu_nmi_tss;
32 union descriptor uu_gdt[NGDT];
33 } u_tssgdt;
34 char u_align[PAGE_SIZE];
35 } cif_TSS_RO;
36#define cif_tss cif_TSS_RO.u_tssgdt.uu_tss
37#define cif_nmi_tss cif_TSS_RO.u_tssgdt.uu_nmi_tss
38#define cif_gdt cif_TSS_RO.u_tssgdt.uu_gdt
39
40 /* start of page mapped kRW in u-k */
41 uint32_t cif_tramp_stack[(PAGE_SIZE / 4
42 - offsetof(struct cpu_info, ci_PAGEALIGN)) / sizeof(uint32_t)];
43 uint32_t cif_nmi_stack[(3 * PAGE_SIZE / 4) / sizeof(uint32_t)];
44
45 /*
46 * Beginning of this hangs over into the kRW page; rest is
47 * unmapped in u-k
48 */
49 struct cpu_info cif_cpu;
50} __aligned(PAGE_SIZE);
51
52/* tss, align shim, and gdt must fit in a page */
53CTASSERT(_ALIGN(2 * sizeof(struct i386tss)) +
54 sizeof(struct segment_descriptor) * NGDT < PAGE_SIZE);
55
56/* verify expected alignment */
57CTASSERT(offsetof(struct cpu_info_full, cif_cpu.ci_PAGEALIGN) % PAGE_SIZE == 0);
58
59/* verify total size is multiple of page size */
60CTASSERT(sizeof(struct cpu_info_full) % PAGE_SIZE == 0);
61
62extern struct cpu_info_full cpu_info_full_primary;
63
64/* Now make sure the cpu_info_primary macro is correct */
65CTASSERT(&cpu_info_primary - &cpu_info_full_primary.cif_cpu == 0);
66
67#endif /* _MACHINE_CPU_FULL_H_ */