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 26 struct 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 */ 53 CTASSERT(_ALIGN(2 * sizeof(struct i386tss)) + 54 sizeof(struct segment_descriptor) * NGDT < PAGE_SIZE); 55 56 /* verify expected alignment */ 57 CTASSERT(offsetof(struct cpu_info_full, cif_cpu.ci_PAGEALIGN) % PAGE_SIZE == 0); 58 59 /* verify total size is multiple of page size */ 60 CTASSERT(sizeof(struct cpu_info_full) % PAGE_SIZE == 0); 61 62 extern struct cpu_info_full cpu_info_full_primary; 63 64 /* Now make sure the cpu_info_primary macro is correct */ 65 CTASSERT(&cpu_info_primary - &cpu_info_full_primary.cif_cpu == 0); 66 67 #endif /* _MACHINE_CPU_FULL_H_ */ 68