1 /*
2 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
3 */
4 /*
5 * Copyright 2016 Joyent, Inc.
6 */
7
8 #ifndef _SYS_SEGMENTS_H
9 #define _SYS_SEGMENTS_H
10
11 #ifdef __cplusplus
12 extern "C" {
13 #endif
14
15 /*
16 * Copyright (c) 1989, 1990 William F. Jolitz
17 * Copyright (c) 1990 The Regents of the University of California.
18 * All rights reserved.
19 *
20 * This code is derived from software contributed to Berkeley by
21 * William Jolitz.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
81
82 #define SELTOIDX(s) ((s) >> 3) /* selector to index */
83
84 /*
85 * SEL_(KPL,UPL,XPL) is the RPL or DPL value for code and data selectors
86 * and their descriptors respectively.
87 *
88 * TRP_(KPL,UPL,XPL) is used to indicate the DPL for system gates only.
89 *
90 * This distinction is important to support para-virt guests on the
91 * 64-bit hypervisor. Both guest kernel and user run in ring 3 and the
92 * hypervisor runs in ring 0. When the kernel creates its trap and
93 * interrupt gates it needs a way to prevent any arbitrary int $n
94 * instruction from entering a gate that is not expected. The hypervisor
95 * allows these gates to have a DPL from 1 to 3. By creating gates
96 * with a DPL below user (ring 3) the int $n will generate a #gp fault
97 * which the hypervisor catches and forwards to the guest.
98 */
99 #if defined(__xpv)
100
101 #if defined(__amd64)
102
103 #define SEL_XPL 0 /* hypervisor privilege level */
104 #define SEL_KPL 3 /* both kernel and user in ring 3 */
105 #define TRP_KPL 1 /* system gate priv (user blocked) */
106
107 #elif defined(__i386)
108
109 #define SEL_XPL 0 /* hypervisor privilege level */
110 #define SEL_KPL 1 /* kernel privilege level */
111 #define TRP_KPL SEL_KPL /* system gate priv (user blocked) */
112
113 #endif /* __i386 */
114
115 #define TRP_XPL 0 /* system gate priv (hypervisor) */
116
117 #else /* __xpv */
118
119 #define SEL_KPL 0 /* kernel privilege level on metal */
120 #define TRP_KPL SEL_KPL /* system gate priv (user blocked) */
121
122 #endif /* __xpv */
123
124 #define SEL_UPL 3 /* user priority level */
125 #define TRP_UPL 3 /* system gate priv (user allowed) */
126 #define SEL_TI_LDT 4 /* local descriptor table */
127 #define SEL_LDT(s) (IDXTOSEL(s) | SEL_TI_LDT | SEL_UPL) /* local sel */
128 #define CPL_MASK 3 /* RPL mask for selector */
129 #define SELISLDT(s) (((s) & SEL_TI_LDT) == SEL_TI_LDT)
130 #define SELISUPL(s) (((s) & CPL_MASK) == SEL_UPL)
131
132 #ifndef _ASM
133
134 typedef uint16_t selector_t; /* selector reigster */
135
136 /*
137 * Hardware descriptor table register format for GDT and IDT.
138 */
139 #if defined(__amd64)
140
141 #pragma pack(2)
142 typedef struct {
143 uint16_t dtr_limit; /* table limit */
384 (sgd)->sgd_hioffset << 16 | \
385 (uint64_t)((sgd)->sgd_hi64offset) << 32))
386
387 #endif /* __amd64 */
388
389 /*
390 * functions for initializing and updating segment descriptors.
391 */
392 #if defined(__amd64)
393
394 extern void set_usegd(user_desc_t *, uint_t, void *, size_t, uint_t, uint_t,
395 uint_t, uint_t);
396
397 #elif defined(__i386)
398
399 extern void set_usegd(user_desc_t *, void *, size_t, uint_t, uint_t,
400 uint_t, uint_t);
401
402 #endif /* __i386 */
403
404 extern void set_gatesegd(gate_desc_t *, void (*)(void), selector_t,
405 uint_t, uint_t, uint_t);
406
407 extern void set_syssegd(system_desc_t *, void *, size_t, uint_t, uint_t);
408
409 extern void *get_ssd_base(system_desc_t *);
410
411 extern void gdt_update_usegd(uint_t, user_desc_t *);
412
413 extern int ldt_update_segd(user_desc_t *, user_desc_t *);
414
415 #if defined(__xpv)
416
417 extern int xen_idt_to_trap_info(uint_t, gate_desc_t *, void *);
418 extern void xen_idt_write(gate_desc_t *, uint_t);
419
420 #endif /* __xen */
421
422 void init_boot_gdt(user_desc_t *);
423
629 */
630 #if defined(__amd64)
631 #define KMDBCODE_SEL B64CODE_SEL
632 #else
633 #define KMDBCODE_SEL B32CODE_SEL
634 #endif
635
636 /*
637 * Entries in default Local Descriptor Table (LDT) for every process.
638 */
639 #define LDT_SYSCALL 0 /* call gate for libc.a (obsolete) */
640 #define LDT_SIGCALL 1 /* EOL me, call gate for static sigreturn */
641 #define LDT_RESVD1 2 /* old user %cs */
642 #define LDT_RESVD2 3 /* old user %ds */
643 #define LDT_ALTSYSCALL 4 /* alternate call gate for system calls */
644 #define LDT_ALTSIGCALL 5 /* EOL me, alternate call gate for sigreturn */
645 #define LDT_UDBASE 6 /* user descriptor base index */
646 #define MINNLDT 512 /* Current min solaris ldt size (1 4K page) */
647 #define MAXNLDT 8192 /* max solaris ldt size (16 4K pages) */
648
649 #ifndef _ASM
650
651 extern gate_desc_t *idt0;
652 extern desctbr_t idt0_default_reg;
653 extern user_desc_t *gdt0;
654
655 extern user_desc_t zero_udesc;
656 extern user_desc_t null_udesc;
657 extern system_desc_t null_sdesc;
658
659 #if defined(__amd64)
660 extern user_desc_t zero_u32desc;
661 #endif
662 #if defined(__amd64)
663 extern user_desc_t ucs_on;
664 extern user_desc_t ucs_off;
665 extern user_desc_t ucs32_on;
666 extern user_desc_t ucs32_off;
667 #endif /* __amd64 */
668
669 extern tss_t *ktss0;
670
671 #if defined(__i386)
672 extern tss_t *dftss0;
673 #endif /* __i386 */
674
675 extern void div0trap(), dbgtrap(), nmiint(), brktrap(), ovflotrap();
676 extern void boundstrap(), invoptrap(), ndptrap();
677 #if !defined(__xpv)
678 extern void syserrtrap();
679 #endif
680 extern void invaltrap(), invtsstrap(), segnptrap(), stktrap();
681 extern void gptrap(), pftrap(), ndperr();
682 extern void overrun(), resvtrap();
683 extern void _start(), cmnint();
684 extern void achktrap(), mcetrap();
685 extern void xmtrap();
686 extern void fasttrap();
687 extern void dtrace_ret();
688
689 #if !defined(__amd64)
690 extern void pentium_pftrap();
691 #endif
692
693 #endif /* _ASM */
694
695 #ifdef __cplusplus
696 }
697 #endif
698
699 #endif /* _SYS_SEGMENTS_H */
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1 /*
2 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
3 */
4 /*
5 * Copyright 2018 Joyent, Inc.
6 */
7
8 #ifndef _SYS_SEGMENTS_H
9 #define _SYS_SEGMENTS_H
10
11 #ifdef __cplusplus
12 extern "C" {
13 #endif
14
15 /*
16 * Copyright (c) 1989, 1990 William F. Jolitz
17 * Copyright (c) 1990 The Regents of the University of California.
18 * All rights reserved.
19 *
20 * This code is derived from software contributed to Berkeley by
21 * William Jolitz.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
81
82 #define SELTOIDX(s) ((s) >> 3) /* selector to index */
83
84 /*
85 * SEL_(KPL,UPL,XPL) is the RPL or DPL value for code and data selectors
86 * and their descriptors respectively.
87 *
88 * TRP_(KPL,UPL,XPL) is used to indicate the DPL for system gates only.
89 *
90 * This distinction is important to support para-virt guests on the
91 * 64-bit hypervisor. Both guest kernel and user run in ring 3 and the
92 * hypervisor runs in ring 0. When the kernel creates its trap and
93 * interrupt gates it needs a way to prevent any arbitrary int $n
94 * instruction from entering a gate that is not expected. The hypervisor
95 * allows these gates to have a DPL from 1 to 3. By creating gates
96 * with a DPL below user (ring 3) the int $n will generate a #gp fault
97 * which the hypervisor catches and forwards to the guest.
98 */
99 #if defined(__xpv)
100
101 #define SEL_XPL 0 /* hypervisor privilege level */
102 #define SEL_KPL 3 /* both kernel and user in ring 3 */
103 #define TRP_KPL 1 /* system gate priv (user blocked) */
104 #define TRP_XPL 0 /* system gate priv (hypervisor) */
105
106 #define IST_DBG 0
107
108 #else /* __xpv */
109
110 #define SEL_KPL 0 /* kernel privilege level on metal */
111 #define TRP_KPL SEL_KPL /* system gate priv (user blocked) */
112
113
114 #define IST_DF 1
115 #define IST_NMI 2
116 #define IST_MCE 3
117 #define IST_DBG 4
118 #define IST_NESTABLE 5
119 #define IST_DEFAULT 6
120
121 #endif /* __xpv */
122
123 #define IST_NONE 0
124
125 #define SEL_UPL 3 /* user priority level */
126 #define TRP_UPL 3 /* system gate priv (user allowed) */
127 #define SEL_TI_LDT 4 /* local descriptor table */
128 #define SEL_LDT(s) (IDXTOSEL(s) | SEL_TI_LDT | SEL_UPL) /* local sel */
129 #define CPL_MASK 3 /* RPL mask for selector */
130 #define SELISLDT(s) (((s) & SEL_TI_LDT) == SEL_TI_LDT)
131 #define SELISUPL(s) (((s) & CPL_MASK) == SEL_UPL)
132
133 #ifndef _ASM
134
135 typedef uint16_t selector_t; /* selector reigster */
136
137 /*
138 * Hardware descriptor table register format for GDT and IDT.
139 */
140 #if defined(__amd64)
141
142 #pragma pack(2)
143 typedef struct {
144 uint16_t dtr_limit; /* table limit */
385 (sgd)->sgd_hioffset << 16 | \
386 (uint64_t)((sgd)->sgd_hi64offset) << 32))
387
388 #endif /* __amd64 */
389
390 /*
391 * functions for initializing and updating segment descriptors.
392 */
393 #if defined(__amd64)
394
395 extern void set_usegd(user_desc_t *, uint_t, void *, size_t, uint_t, uint_t,
396 uint_t, uint_t);
397
398 #elif defined(__i386)
399
400 extern void set_usegd(user_desc_t *, void *, size_t, uint_t, uint_t,
401 uint_t, uint_t);
402
403 #endif /* __i386 */
404
405 extern uint_t idt_vector_to_ist(uint_t);
406
407 extern void set_gatesegd(gate_desc_t *, void (*)(void), selector_t,
408 uint_t, uint_t, uint_t);
409
410 extern void set_syssegd(system_desc_t *, void *, size_t, uint_t, uint_t);
411
412 extern void *get_ssd_base(system_desc_t *);
413
414 extern void gdt_update_usegd(uint_t, user_desc_t *);
415
416 extern int ldt_update_segd(user_desc_t *, user_desc_t *);
417
418 #if defined(__xpv)
419
420 extern int xen_idt_to_trap_info(uint_t, gate_desc_t *, void *);
421 extern void xen_idt_write(gate_desc_t *, uint_t);
422
423 #endif /* __xen */
424
425 void init_boot_gdt(user_desc_t *);
426
632 */
633 #if defined(__amd64)
634 #define KMDBCODE_SEL B64CODE_SEL
635 #else
636 #define KMDBCODE_SEL B32CODE_SEL
637 #endif
638
639 /*
640 * Entries in default Local Descriptor Table (LDT) for every process.
641 */
642 #define LDT_SYSCALL 0 /* call gate for libc.a (obsolete) */
643 #define LDT_SIGCALL 1 /* EOL me, call gate for static sigreturn */
644 #define LDT_RESVD1 2 /* old user %cs */
645 #define LDT_RESVD2 3 /* old user %ds */
646 #define LDT_ALTSYSCALL 4 /* alternate call gate for system calls */
647 #define LDT_ALTSIGCALL 5 /* EOL me, alternate call gate for sigreturn */
648 #define LDT_UDBASE 6 /* user descriptor base index */
649 #define MINNLDT 512 /* Current min solaris ldt size (1 4K page) */
650 #define MAXNLDT 8192 /* max solaris ldt size (16 4K pages) */
651
652 #ifdef _KERNEL
653 #define LDT_CPU_SIZE (16 * 4096) /* Size of kernel per-CPU allocation */
654 #endif
655
656 #ifndef _ASM
657
658 extern gate_desc_t *idt0;
659 extern desctbr_t idt0_default_reg;
660 extern user_desc_t *gdt0;
661
662 extern user_desc_t zero_udesc;
663 extern user_desc_t null_udesc;
664 extern system_desc_t null_sdesc;
665
666 #if defined(__amd64)
667 extern user_desc_t zero_u32desc;
668 #endif
669 #if defined(__amd64)
670 extern user_desc_t ucs_on;
671 extern user_desc_t ucs_off;
672 extern user_desc_t ucs32_on;
673 extern user_desc_t ucs32_off;
674 #endif /* __amd64 */
675
676 extern tss_t *ktss0;
677
678 #if defined(__i386)
679 extern tss_t *dftss0;
680 #endif /* __i386 */
681
682 extern void div0trap(), dbgtrap(), nmiint(), brktrap(), ovflotrap();
683 extern void boundstrap(), invoptrap(), ndptrap();
684 #if !defined(__xpv)
685 extern void syserrtrap();
686 #endif
687 extern void invaltrap(), invtsstrap(), segnptrap(), stktrap();
688 extern void gptrap(), pftrap(), ndperr();
689 extern void overrun(), resvtrap();
690 extern void _start(), cmnint();
691 extern void achktrap(), mcetrap();
692 extern void xmtrap();
693 extern void fasttrap();
694 extern void dtrace_ret();
695
696 /* KPTI trampolines */
697 extern void tr_invaltrap();
698 extern void tr_div0trap(), tr_dbgtrap(), tr_nmiint(), tr_brktrap();
699 extern void tr_ovflotrap(), tr_boundstrap(), tr_invoptrap(), tr_ndptrap();
700 #if !defined(__xpv)
701 extern void tr_syserrtrap();
702 #endif
703 extern void tr_invaltrap(), tr_invtsstrap(), tr_segnptrap(), tr_stktrap();
704 extern void tr_gptrap(), tr_pftrap(), tr_ndperr();
705 extern void tr_overrun(), tr_resvtrap();
706 extern void tr_achktrap(), tr_mcetrap();
707 extern void tr_xmtrap();
708 extern void tr_fasttrap();
709 extern void tr_dtrace_ret();
710
711 #if !defined(__amd64)
712 extern void pentium_pftrap();
713 #endif
714
715 extern uint64_t kpti_enable;
716
717 #endif /* _ASM */
718
719 #ifdef __cplusplus
720 }
721 #endif
722
723 #endif /* _SYS_SEGMENTS_H */
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