1 /* $OpenBSD: cpu_full.h,v 1.5 2019/05/17 19:07:47 guenther Exp $ */ 2 /* 3 * Copyright (c) 2018 Philip Guenther <guenther@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #ifndef _MACHINE_CPU_FULL_H_ 19 #define _MACHINE_CPU_FULL_H_ 20 21 #include <sys/param.h> /* offsetof, PAGE_SIZE */ 22 #include <machine/segments.h> 23 #include <machine/tss.h> 24 25 /* 26 * The layout of the full per-CPU information, including TSS, GDT, 27 * trampoline stacks, and cpu_info described in <machine/cpu.h> 28 */ 29 struct cpu_info_full { 30 /* page mapped kRO in u-k */ 31 union { 32 struct { 33 struct x86_64_tss uu_tss; 34 uint64_t uu_gdt[GDT_SIZE / 8]; 35 } u_tssgdt; 36 char u_align[PAGE_SIZE]; 37 } cif_RO; 38 #define cif_tss cif_RO.u_tssgdt.uu_tss 39 #define cif_gdt cif_RO.u_tssgdt.uu_gdt 40 41 /* start of page mapped kRW in u-k */ 42 uint64_t cif_tramp_stack[(PAGE_SIZE / 4 43 - offsetof(struct cpu_info, ci_PAGEALIGN)) / sizeof(uint64_t)]; 44 uint64_t cif_dblflt_stack[(PAGE_SIZE / 4) / sizeof(uint64_t)]; 45 uint64_t cif_nmi_stack[(2 * PAGE_SIZE / 4) / sizeof(uint64_t)]; 46 47 /* 48 * Beginning of this hangs over into the kRW page; rest is 49 * unmapped in u-k 50 */ 51 struct cpu_info cif_cpu; 52 } __aligned(PAGE_SIZE); 53 54 /* tss, align shim, and gdt must fit in a page */ 55 CTASSERT(_ALIGN(sizeof(struct x86_64_tss)) + 56 sizeof(struct mem_segment_descriptor) * (NGDT_MEM + 2*NGDT_SYS) 57 < PAGE_SIZE); 58 59 /* verify expected alignment */ 60 CTASSERT(offsetof(struct cpu_info_full, cif_cpu.ci_PAGEALIGN) % PAGE_SIZE == 0); 61 62 /* verify total size is multiple of page size */ 63 CTASSERT(sizeof(struct cpu_info_full) % PAGE_SIZE == 0); 64 65 extern struct cpu_info_full cpu_info_full_primary; 66 67 /* Now make sure the cpu_info_primary macro is correct */ 68 CTASSERT(&cpu_info_primary - &cpu_info_full_primary.cif_cpu == 0); 69 70 #endif /* _MACHINE_CPU_FULL_H_ */ 71