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/* $OpenBSD: cpu_full.h,v 1.5 2019/05/17 19:07:47 guenther Exp $ */
/*
* Copyright (c) 2018 Philip Guenther <guenther@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _MACHINE_CPU_FULL_H_
#define _MACHINE_CPU_FULL_H_
#include <sys/param.h> /* offsetof, PAGE_SIZE */
#include <machine/segments.h>
#include <machine/tss.h>
/*
* The layout of the full per-CPU information, including TSS, GDT,
* trampoline stacks, and cpu_info described in <machine/cpu.h>
*/
struct cpu_info_full {
/* page mapped kRO in u-k */
union {
struct {
struct x86_64_tss uu_tss;
uint64_t uu_gdt[GDT_SIZE / 8];
} u_tssgdt;
char u_align[PAGE_SIZE];
} cif_RO;
#define cif_tss cif_RO.u_tssgdt.uu_tss
#define cif_gdt cif_RO.u_tssgdt.uu_gdt
/* start of page mapped kRW in u-k */
uint64_t cif_tramp_stack[(PAGE_SIZE / 4
- offsetof(struct cpu_info, ci_PAGEALIGN)) / sizeof(uint64_t)];
uint64_t cif_dblflt_stack[(PAGE_SIZE / 4) / sizeof(uint64_t)];
uint64_t cif_nmi_stack[(2 * PAGE_SIZE / 4) / sizeof(uint64_t)];
/*
* Beginning of this hangs over into the kRW page; rest is
* unmapped in u-k
*/
struct cpu_info cif_cpu;
} __aligned(PAGE_SIZE);
/* tss, align shim, and gdt must fit in a page */
CTASSERT(_ALIGN(sizeof(struct x86_64_tss)) +
sizeof(struct mem_segment_descriptor) * (NGDT_MEM + 2*NGDT_SYS)
< PAGE_SIZE);
/* verify expected alignment */
CTASSERT(offsetof(struct cpu_info_full, cif_cpu.ci_PAGEALIGN) % PAGE_SIZE == 0);
/* verify total size is multiple of page size */
CTASSERT(sizeof(struct cpu_info_full) % PAGE_SIZE == 0);
extern struct cpu_info_full cpu_info_full_primary;
/* Now make sure the cpu_info_primary macro is correct */
CTASSERT(&cpu_info_primary - &cpu_info_full_primary.cif_cpu == 0);
#endif /* _MACHINE_CPU_FULL_H_ */
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