xref: /illumos-gate/usr/src/uts/i86pc/sys/rm_platter.h (revision 74ecdb51)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
23  */
24 /*
25  * Copyright (c) 2010, Intel Corporation.
26  * All rights reserved.
27  */
28 /*
29  * Copyright 2018 Joyent, Inc.
30  */
31 
32 #ifndef	_SYS_RM_PLATTER_H
33 #define	_SYS_RM_PLATTER_H
34 
35 #include <sys/types.h>
36 #include <sys/tss.h>
37 #include <sys/segments.h>
38 
39 #ifdef	__cplusplus
40 extern "C" {
41 #endif
42 
43 #define	RM_PLATTER_CODE_SIZE		0x400
44 #define	RM_PLATTER_CPU_HALT_CODE_SIZE	0x100
45 
46 typedef	struct rm_platter {
47 	char		rm_code[RM_PLATTER_CODE_SIZE];
48 	char		rm_cpu_halt_code[RM_PLATTER_CPU_HALT_CODE_SIZE];
49 #if defined(__amd64)
50 	/*
51 	 * The compiler will want to 64-bit align the 64-bit rm_gdt_base
52 	 * pointer, so we need to add an extra four bytes of padding here to
53 	 * make sure rm_gdt_lim and rm_gdt_base will align to create a proper
54 	 * ten byte GDT pseudo-descriptor.
55 	 */
56 	uint32_t	rm_gdt_pad;
57 #endif	/* __amd64 */
58 	ushort_t	rm_debug;
59 	ushort_t	rm_gdt_lim;	/* stuff for lgdt */
60 	user_desc_t	*rm_gdt_base;
61 #if defined(__amd64)
62 	/*
63 	 * The compiler will want to 64-bit align the 64-bit rm_idt_base
64 	 * pointer, so we need to add an extra four bytes of padding here to
65 	 * make sure rm_idt_lim and rm_idt_base will align to create a proper
66 	 * ten byte IDT pseudo-descriptor.
67 	 */
68 	uint32_t	rm_idt_pad;
69 #endif	/* __amd64 */
70 	ushort_t	rm_cpu_halted;	/* non-zero if CPU has been halted */
71 	ushort_t	rm_idt_lim;	/* stuff for lidt */
72 	gate_desc_t	*rm_idt_base;
73 	uint_t		rm_pdbr;	/* cr3 value */
74 	uint_t		rm_cpu;		/* easy way to know which CPU we are */
75 	uint_t		rm_filler3;
76 	uint_t		rm_cr4;		/* cr4 value on cpu0 */
77 #if defined(__amd64)
78 	/*
79 	 * Temporary GDT for the brief transition from real mode to protected
80 	 * mode before a CPU continues on into long mode.
81 	 *
82 	 * Putting it here assures it will be located in identity mapped memory
83 	 * (va == pa, 1:1).
84 	 *
85 	 * rm_temp_gdt is sized to hold only a null descriptor in slot zero
86 	 * and a 64-bit code descriptor in slot one.
87 	 *
88 	 * rm_temp_[gi]dt_lim and rm_temp_[gi]dt_base are the pseudo-descriptors
89 	 * for the temporary GDT and IDT, respectively.
90 	 */
91 	uint64_t	rm_temp_gdt[2];
92 	ushort_t	rm_temp_gdtdesc_pad;	/* filler to align GDT desc */
93 	ushort_t	rm_temp_gdt_lim;
94 	uint32_t	rm_temp_gdt_base;
95 	ushort_t	rm_temp_idtdesc_pad;	/* filler to align IDT desc */
96 	ushort_t	rm_temp_idt_lim;
97 	uint32_t	rm_temp_idt_base;
98 
99 	/*
100 	 * The code executing in the rm_platter needs the offset into the
101 	 * platter at which the 64-bit code starts, so have mp_startup
102 	 * calculate it and store it here.
103 	 */
104 	uint32_t	rm_longmode64_addr;
105 #endif	/* __amd64 */
106 } rm_platter_t;
107 
108 /*
109  * cpu tables put within a single structure two of the tables which need to be
110  * allocated when a CPU starts up.
111  *
112  * Note: the tss should be 16 byte aligned for best performance on amd64
113  * Since DEFAULTSTKSIZE is a multiple of PAGESIZE tss will be aligned.
114  */
115 struct cpu_tables {
116 	/* IST stacks */
117 	char		ct_stack1[DEFAULTSTKSZ];	/* dblfault */
118 #if !defined(__xpv)
119 	char		ct_stack2[DEFAULTSTKSZ];	/* nmi */
120 	char		ct_stack3[DEFAULTSTKSZ];	/* mce */
121 #endif
122 	tss_t		ct_tss;
123 };
124 
125 /*
126  * gdt entries are 8 bytes long, ensure that we have an even no. of them.
127  */
128 #if ((NGDT / 2) * 2 != NGDT)
129 #error "rm_platter.h: tss not properly aligned"
130 #endif
131 
132 #ifdef	__cplusplus
133 }
134 #endif
135 
136 #endif	/* _SYS_RM_PLATTER_H */
137