Annotation of sys/arch/amd64/include/segments.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: segments.h,v 1.4 2005/12/13 00:18:19 jsg Exp $ */
! 2: /* $NetBSD: segments.h,v 1.1 2003/04/26 18:39:47 fvdl Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1995, 1997
! 6: * Charles M. Hannum. All rights reserved.
! 7: * Copyright (c) 1989, 1990 William F. Jolitz
! 8: * Copyright (c) 1990 The Regents of the University of California.
! 9: * All rights reserved.
! 10: *
! 11: * This code is derived from software contributed to Berkeley by
! 12: * William Jolitz.
! 13: *
! 14: * Redistribution and use in source and binary forms, with or without
! 15: * modification, are permitted provided that the following conditions
! 16: * are met:
! 17: * 1. Redistributions of source code must retain the above copyright
! 18: * notice, this list of conditions and the following disclaimer.
! 19: * 2. Redistributions in binary form must reproduce the above copyright
! 20: * notice, this list of conditions and the following disclaimer in the
! 21: * documentation and/or other materials provided with the distribution.
! 22: * 3. Neither the name of the University nor the names of its contributors
! 23: * may be used to endorse or promote products derived from this software
! 24: * without specific prior written permission.
! 25: *
! 26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 36: * SUCH DAMAGE.
! 37: *
! 38: * @(#)segments.h 7.1 (Berkeley) 5/9/91
! 39: */
! 40:
! 41: /*
! 42: * Adapted for NetBSD/amd64 by fvdl@wasabisystems.com.
! 43: */
! 44:
! 45: /*
! 46: * 386 Segmentation Data Structures and definitions
! 47: * William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989
! 48: */
! 49:
! 50: #ifndef _AMD64_SEGMENTS_H_
! 51: #define _AMD64_SEGMENTS_H_
! 52:
! 53: /*
! 54: * Selectors
! 55: */
! 56:
! 57: #define ISPL(s) ((s) & SEL_RPL) /* what is the priority level of a selector */
! 58: #define SEL_KPL 0 /* kernel privilege level */
! 59: #define SEL_UPL 3 /* user privilege level */
! 60: #define SEL_RPL 3 /* requester's privilege level mask */
! 61: #define ISLDT(s) ((s) & SEL_LDT) /* is it local or global */
! 62: #define SEL_LDT 4 /* local descriptor table */
! 63:
! 64: /* Dynamically allocated TSSs and LDTs start (byte offset) */
! 65: #define SYSSEL_START (NGDT_MEM << 3)
! 66: #define DYNSEL_START (SYSSEL_START + (NGDT_SYS << 4))
! 67:
! 68: /*
! 69: * These define the index not from the start of the GDT, but from
! 70: * the part of the GDT that they're allocated from.
! 71: * First NGDT_MEM entries are 8-byte descriptors for CS and DS.
! 72: * Next NGDT_SYS entries are 16-byte descriptors defining LDTs.
! 73: *
! 74: * The rest is 16-byte descriptors for TSS and LDT.
! 75: */
! 76:
! 77: #define IDXSEL(s) (((s) >> 3) & 0x1fff)
! 78: #define IDXDYNSEL(s) ((((s) & ~SEL_RPL) - DYNSEL_START) >> 4)
! 79:
! 80: #define GSEL(s,r) (((s) << 3) | r)
! 81: #define GSYSSEL(s,r) ((((s) << 4) + SYSSEL_START) | r)
! 82: #define GDYNSEL(s,r) ((((s) << 4) + DYNSEL_START) | r | SEL_KPL)
! 83:
! 84: #define LSEL(s,r) ((s) | r | SEL_LDT)
! 85:
! 86: #define USERMODE(c, f) (ISPL(c) == SEL_UPL)
! 87: #define KERNELMODE(c, f) (ISPL(c) == SEL_KPL)
! 88:
! 89: #ifndef _LOCORE
! 90:
! 91: /*
! 92: * Memory and System segment descriptors
! 93: */
! 94:
! 95: /*
! 96: * Below is used for TSS and LDT.
! 97: */
! 98: struct sys_segment_descriptor {
! 99: /*BITFIELDTYPE*/ u_int64_t sd_lolimit:16;/* segment extent (lsb) */
! 100: /*BITFIELDTYPE*/ u_int64_t sd_lobase:24;/* segment base address (lsb) */
! 101: /*BITFIELDTYPE*/ u_int64_t sd_type:5; /* segment type */
! 102: /*BITFIELDTYPE*/ u_int64_t sd_dpl:2; /* segment descriptor priority level */
! 103: /*BITFIELDTYPE*/ u_int64_t sd_p:1; /* segment descriptor present */
! 104: /*BITFIELDTYPE*/ u_int64_t sd_hilimit:4;/* segment extent (msb) */
! 105: /*BITFIELDTYPE*/ u_int64_t sd_xx1:3; /* avl, long and def32 (not used) */
! 106: /*BITFIELDTYPE*/ u_int64_t sd_gran:1; /* limit granularity (byte/page) */
! 107: /*BITFIELDTYPE*/ u_int64_t sd_hibase:40;/* segment base address (msb) */
! 108: /*BITFIELDTYPE*/ u_int64_t sd_xx2:8; /* reserved */
! 109: /*BITFIELDTYPE*/ u_int64_t sd_zero:5; /* must be zero */
! 110: /*BITFIELDTYPE*/ u_int64_t sd_xx3:19; /* reserved */
! 111: } __attribute__((packed));
! 112:
! 113: /*
! 114: * Below is used for cs, ds, etc.
! 115: */
! 116: struct mem_segment_descriptor {
! 117: unsigned int sd_lolimit:16; /* segment extent (lsb) */
! 118: unsigned int sd_lobase:24; /* segment base address (lsb) */
! 119: unsigned int sd_type:5; /* segment type */
! 120: unsigned int sd_dpl:2; /* segment descriptor priority level */
! 121: unsigned int sd_p:1; /* segment descriptor present */
! 122: unsigned int sd_hilimit:4; /* segment extent (msb) */
! 123: unsigned int sd_avl:1; /* available */
! 124: unsigned int sd_long:1; /* long mode */
! 125: unsigned int sd_def32:1; /* default 32 vs 16 bit size */
! 126: unsigned int sd_gran:1; /* limit granularity (byte/page) */
! 127: unsigned int sd_hibase:8; /* segment base address (msb) */
! 128: } __attribute__((packed));
! 129:
! 130: /*
! 131: * Gate descriptors (e.g. indirect descriptors)
! 132: */
! 133: struct gate_descriptor {
! 134: /*BITFIELDTYPE*/ u_int64_t gd_looffset:16;/* gate offset (lsb) */
! 135: /*BITFIELDTYPE*/ u_int64_t gd_selector:16;/* gate segment selector */
! 136: /*BITFIELDTYPE*/ u_int64_t gd_ist:3; /* IST select */
! 137: /*BITFIELDTYPE*/ u_int64_t gd_xx1:5; /* reserved */
! 138: /*BITFIELDTYPE*/ u_int64_t gd_type:5; /* segment type */
! 139: /*BITFIELDTYPE*/ u_int64_t gd_dpl:2; /* segment descriptor priority level */
! 140: /*BITFIELDTYPE*/ u_int64_t gd_p:1; /* segment descriptor present */
! 141: /*BITFIELDTYPE*/ u_int64_t gd_hioffset:48;/* gate offset (msb) */
! 142: /*BITFIELDTYPE*/ u_int64_t gd_xx2:8; /* reserved */
! 143: /*BITFIELDTYPE*/ u_int64_t gd_zero:5; /* must be zero */
! 144: /*BITFIELDTYPE*/ u_int64_t gd_xx3:19; /* reserved */
! 145: } __attribute__((packed));
! 146:
! 147: /*
! 148: * region descriptors, used to load gdt/idt tables before segments yet exist.
! 149: */
! 150: struct region_descriptor {
! 151: u_int16_t rd_limit; /* segment extent */
! 152: u_int64_t rd_base; /* base address */
! 153: } __attribute__((packed));
! 154:
! 155: #ifdef _KERNEL
! 156: #if 0
! 157: extern struct sys_segment_descriptor *ldt;
! 158: #endif
! 159: extern struct gate_descriptor *idt;
! 160: extern char *gdtstore;
! 161: extern char *ldtstore;
! 162:
! 163: void setgate(struct gate_descriptor *, void *, int, int, int, int);
! 164: void unsetgate(struct gate_descriptor *);
! 165: void setregion(struct region_descriptor *, void *, u_int16_t);
! 166: void set_sys_segment(struct sys_segment_descriptor *, void *, size_t,
! 167: int, int, int);
! 168: void set_mem_segment(struct mem_segment_descriptor *, void *, size_t,
! 169: int, int, int, int, int);
! 170: int idt_vec_alloc(int, int);
! 171: void idt_vec_set(int, void (*)(void));
! 172: void idt_vec_free(int);
! 173: void cpu_init_idt(void);
! 174:
! 175: #endif /* _KERNEL */
! 176:
! 177: #endif /* !_LOCORE */
! 178:
! 179: /* system segments and gate types */
! 180: #define SDT_SYSNULL 0 /* system null */
! 181: #define SDT_SYS286TSS 1 /* system 286 TSS available */
! 182: #define SDT_SYSLDT 2 /* system local descriptor table */
! 183: #define SDT_SYS286BSY 3 /* system 286 TSS busy */
! 184: #define SDT_SYS286CGT 4 /* system 286 call gate */
! 185: #define SDT_SYSTASKGT 5 /* system task gate */
! 186: #define SDT_SYS286IGT 6 /* system 286 interrupt gate */
! 187: #define SDT_SYS286TGT 7 /* system 286 trap gate */
! 188: #define SDT_SYSNULL2 8 /* system null again */
! 189: #define SDT_SYS386TSS 9 /* system 386 TSS available */
! 190: #define SDT_SYSNULL3 10 /* system null again */
! 191: #define SDT_SYS386BSY 11 /* system 386 TSS busy */
! 192: #define SDT_SYS386CGT 12 /* system 386 call gate */
! 193: #define SDT_SYSNULL4 13 /* system null again */
! 194: #define SDT_SYS386IGT 14 /* system 386 interrupt gate */
! 195: #define SDT_SYS386TGT 15 /* system 386 trap gate */
! 196:
! 197: /* memory segment types */
! 198: #define SDT_MEMRO 16 /* memory read only */
! 199: #define SDT_MEMROA 17 /* memory read only accessed */
! 200: #define SDT_MEMRW 18 /* memory read write */
! 201: #define SDT_MEMRWA 19 /* memory read write accessed */
! 202: #define SDT_MEMROD 20 /* memory read only expand dwn limit */
! 203: #define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */
! 204: #define SDT_MEMRWD 22 /* memory read write expand dwn limit */
! 205: #define SDT_MEMRWDA 23 /* memory read write expand dwn limit acessed */
! 206: #define SDT_MEME 24 /* memory execute only */
! 207: #define SDT_MEMEA 25 /* memory execute only accessed */
! 208: #define SDT_MEMER 26 /* memory execute read */
! 209: #define SDT_MEMERA 27 /* memory execute read accessed */
! 210: #define SDT_MEMEC 28 /* memory execute only conforming */
! 211: #define SDT_MEMEAC 29 /* memory execute only accessed conforming */
! 212: #define SDT_MEMERC 30 /* memory execute read conforming */
! 213: #define SDT_MEMERAC 31 /* memory execute read accessed conforming */
! 214:
! 215: /* is memory segment descriptor pointer ? */
! 216: #define ISMEMSDP(s) ((s->d_type) >= SDT_MEMRO && \
! 217: (s->d_type) <= SDT_MEMERAC)
! 218:
! 219: /* is 286 gate descriptor pointer ? */
! 220: #define IS286GDP(s) ((s->d_type) >= SDT_SYS286CGT && \
! 221: (s->d_type) < SDT_SYS286TGT)
! 222:
! 223: /* is 386 gate descriptor pointer ? */
! 224: #define IS386GDP(s) ((s->d_type) >= SDT_SYS386CGT && \
! 225: (s->d_type) < SDT_SYS386TGT)
! 226:
! 227: /* is gate descriptor pointer ? */
! 228: #define ISGDP(s) (IS286GDP(s) || IS386GDP(s))
! 229:
! 230: /* is segment descriptor pointer ? */
! 231: #define ISSDP(s) (ISMEMSDP(s) || !ISGDP(s))
! 232:
! 233: /* is system segment descriptor pointer ? */
! 234: #define ISSYSSDP(s) (!ISMEMSDP(s) && !ISGDP(s))
! 235:
! 236: /*
! 237: * Segment Protection Exception code bits
! 238: */
! 239: #define SEGEX_EXT 0x01 /* recursive or externally induced */
! 240: #define SEGEX_IDT 0x02 /* interrupt descriptor table */
! 241: #define SEGEX_TI 0x04 /* local descriptor table */
! 242:
! 243: /*
! 244: * Entries in the Interrupt Descriptor Table (IDT)
! 245: */
! 246: #define NIDT 256
! 247: #define NRSVIDT 32 /* reserved entries for cpu exceptions */
! 248:
! 249: /*
! 250: * Entries in the Global Descriptor Table (GDT)
! 251: * The code and data descriptors must come first. There
! 252: * are NGDT_MEM of them.
! 253: *
! 254: * Then come the predefined LDT (and possibly TSS) descriptors.
! 255: * There are NGDT_SYS of them.
! 256: */
! 257: #define GNULL_SEL 0 /* Null descriptor */
! 258: #define GCODE_SEL 1 /* Kernel code descriptor */
! 259: #define GDATA_SEL 2 /* Kernel data descriptor */
! 260: #define GUCODE_SEL 3 /* User code descriptor */
! 261: #define GUDATA_SEL 4 /* User data descriptor */
! 262: #define GAPM32CODE_SEL 5
! 263: #define GAPM16CODE_SEL 6
! 264: #define GAPMDATA_SEL 7
! 265: #define GBIOSCODE_SEL 8
! 266: #define GBIOSDATA_SEL 9
! 267: #define GPNPBIOSCODE_SEL 10
! 268: #define GPNPBIOSDATA_SEL 11
! 269: #define GPNPBIOSSCRATCH_SEL 12
! 270: #define GPNPBIOSTRAMP_SEL 13
! 271: #define GUCODE32_SEL 14
! 272: #define GUDATA32_SEL 15
! 273: #define NGDT_MEM 16
! 274:
! 275: #define GLDT_SEL 0 /* Default LDT descriptor */
! 276: #define NGDT_SYS 1
! 277:
! 278: #define GDT_SYS_OFFSET (NGDT_MEM << 3)
! 279:
! 280: #define GDT_ADDR_MEM(s,i) \
! 281: ((struct mem_segment_descriptor *)((s) + ((i) << 3)))
! 282: #define GDT_ADDR_SYS(s,i) \
! 283: ((struct sys_segment_descriptor *)((s) + (((i) << 4) + SYSSEL_START)))
! 284:
! 285: /*
! 286: * Byte offsets in the Local Descriptor Table (LDT)
! 287: * Strange order because of syscall/sysret insns
! 288: */
! 289: #define LSYS5CALLS_SEL 0 /* iBCS system call gate */
! 290: #define LUCODE32_SEL 8 /* 32 bit user code descriptor */
! 291: #define LUDATA_SEL 16 /* User data descriptor */
! 292: #define LUCODE_SEL 24 /* User code descriptor */
! 293: #define LSOL26CALLS_SEL 32 /* Solaris 2.6 system call gate */
! 294: #define LUDATA32_SEL 56 /* 32 bit user data descriptor (needed?)*/
! 295: #define LBSDICALLS_SEL 128 /* BSDI system call gate */
! 296:
! 297: #define LDT_SIZE 144
! 298:
! 299: #define LSYSRETBASE_SEL LUCODE32_SEL
! 300:
! 301: /*
! 302: * Checks for valid user selectors. If USER_LDT ever gets implemented
! 303: * for amd64, these must check the ldt length and SEL_UPL if a user
! 304: * ldt is active.
! 305: */
! 306: #define VALID_USER_DSEL32(s) \
! 307: ((s) == GSEL(GUDATA32_SEL, SEL_UPL) || (s) == LSEL(LUDATA32_SEL, SEL_UPL))
! 308: #define VALID_USER_CSEL32(s) \
! 309: ((s) == GSEL(GUCODE32_SEL, SEL_UPL) || (s) == LSEL(LUCODE32_SEL, SEL_UPL))
! 310:
! 311: #define VALID_USER_CSEL(s) \
! 312: ((s) == GSEL(GUCODE_SEL, SEL_UPL) || (s) == LSEL(LUCODE_SEL, SEL_UPL))
! 313: #define VALID_USER_DSEL(s) \
! 314: ((s) == GSEL(GUDATA_SEL, SEL_UPL) || (s) == LSEL(LUDATA_SEL, SEL_UPL))
! 315:
! 316: #endif /* _AMD64_SEGMENTS_H_ */
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