thread.h

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1993,1992,1991,1990,1989 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        thread.h,v $
   29  * Revision 2.12  93/11/17  16:39:59  dbg
   30  *      Added INTERRUPTED_PC for pc sampling.
   31  *      [93/10/14            dbg]
   32  * 
   33  * Revision 2.11  92/03/03  14:22:42  rpd
   34  *      Added dummy definition of syscall_emulation_sync.
   35  *      [92/03/03            rpd]
   36  * 
   37  * Revision 2.10  92/01/03  20:09:15  dbg
   38  *      Add lock to PCB to govern separate state fields (e.g.
   39  *      floating-point status, io_tss, user_ldt).
   40  *      [91/11/01            dbg]
   41  * 
   42  *      Add user_ldt pointer to machine_state.
   43  *      [91/08/20            dbg]
   44  * 
   45  * Revision 2.9  91/07/31  17:41:31  dbg
   46  *      Save user regs directly in PCB on trap, and switch to separate
   47  *      kernel stack.
   48  * 
   49  *      Add fields for v86 interrupt simulation.
   50  *      [91/07/30  16:58:18  dbg]
   51  * 
   52  * Revision 2.8  91/05/14  16:17:39  mrt
   53  *      Correcting copyright
   54  * 
   55  * Revision 2.7  91/05/08  12:43:08  dbg
   56  *      Change ktss to iopb_tss in pcb.
   57  *      [91/04/26  14:39:10  dbg]
   58  * 
   59  * Revision 2.6  91/03/16  14:45:21  rpd
   60  *      Removed k_ipl from i386_kernel_state.
   61  *      [91/03/01            rpd]
   62  * 
   63  *      Pulled i386_fpsave_state out of i386_machine_state.
   64  *      [91/02/18            rpd]
   65  * 
   66  *      Renamed unused field in i386_saved_state to cr2.
   67  *      Removed switch_thread_context.
   68  *      [91/02/05            rpd]
   69  * 
   70  * Revision 2.5  91/02/05  17:15:03  mrt
   71  *      Changed to new Mach copyright
   72  *      [91/02/01  17:38:28  mrt]
   73  * 
   74  * Revision 2.4  91/01/09  22:41:49  rpd
   75  *      Added dummy switch_thread_context macro.
   76  *      Added ktss to i386_machine_state.
   77  *      Removed user_regs, k_stack_top.
   78  *      [91/01/09            rpd]
   79  * 
   80  * Revision 2.3  91/01/08  15:11:12  rpd
   81  *      Added i386_machine_state.
   82  *      [91/01/03  22:05:01  rpd]
   83  * 
   84  *      Reorganized the pcb.
   85  *      [90/12/11            rpd]
   86  * 
   87  * Revision 2.2  90/05/03  15:37:59  dbg
   88  *      Created.
   89  *      [90/02/08            dbg]
   90  * 
   91  */
   92 
   93 /*
   94  *      File:   machine/thread.h
   95  *
   96  *      This file contains the structure definitions for the thread
   97  *      state as applied to I386 processors.
   98  */
   99 
  100 #ifndef _I386_THREAD_H_
  101 #define _I386_THREAD_H_
  102 
  103 #include <mach/boolean.h>
  104 #include <mach/i386/vm_types.h>
  105 #include <mach/i386/fp_reg.h>
  106 
  107 #include <kern/lock.h>
  108 
  109 #include <i386/iopb.h>
  110 #include <i386/tss.h>
  111 
  112 /*
  113  *      i386_saved_state:
  114  *
  115  *      This structure corresponds to the state of user registers
  116  *      as saved upon kernel entry.  It lives in the pcb.
  117  *      It is also pushed onto the stack for exceptions in the kernel.
  118  */
  119 
  120 struct i386_saved_state {
  121         unsigned int    gs;
  122         unsigned int    fs;
  123         unsigned int    es;
  124         unsigned int    ds;
  125         unsigned int    edi;
  126         unsigned int    esi;
  127         unsigned int    ebp;
  128         unsigned int    cr2;            /* kernel esp stored by pusha -
  129                                            we save cr2 here later */
  130         unsigned int    ebx;
  131         unsigned int    edx;
  132         unsigned int    ecx;
  133         unsigned int    eax;
  134         unsigned int    trapno;
  135         unsigned int    err;
  136         unsigned int    eip;
  137         unsigned int    cs;
  138         unsigned int    efl;
  139         unsigned int    uesp;
  140         unsigned int    ss;
  141         struct v86_segs {
  142             unsigned int v86_es;        /* virtual 8086 segment registers */
  143             unsigned int v86_ds;
  144             unsigned int v86_fs;
  145             unsigned int v86_gs;
  146         } v86_segs;
  147 };
  148 
  149 /*
  150  *      i386_exception_link:
  151  *
  152  *      This structure lives at the high end of the kernel stack.
  153  *      It points to the current thread`s user registers.
  154  */
  155 struct i386_exception_link {
  156         struct i386_saved_state *saved_state;
  157 };
  158 
  159 /*
  160  *      i386_kernel_state:
  161  *
  162  *      This structure corresponds to the state of kernel registers
  163  *      as saved in a context-switch.  It lives at the base of the stack.
  164  */
  165 
  166 struct i386_kernel_state {
  167         int                     k_ebx;  /* kernel context */
  168         int                     k_esp;
  169         int                     k_ebp;
  170         int                     k_edi;
  171         int                     k_esi;
  172         int                     k_eip;
  173 };
  174 
  175 /*
  176  *      Save area for user floating-point state.
  177  *      Allocated only when necessary.
  178  */
  179 
  180 struct i386_fpsave_state {
  181         boolean_t               fp_valid;
  182         struct i386_fp_save     fp_save_state;
  183         struct i386_fp_regs     fp_regs;
  184 };
  185 
  186 /*
  187  *      v86_assist_state:
  188  *
  189  *      This structure provides data to simulate 8086 mode
  190  *      interrupts.  It lives in the pcb.
  191  */
  192 
  193 struct v86_assist_state {
  194         vm_offset_t             int_table;
  195         unsigned short          int_count;
  196         unsigned short          flags;  /* 8086 flag bits */
  197 };
  198 #define V86_IF_PENDING          0x8000  /* unused bit */
  199 
  200 /*
  201  *      i386_interrupt_state:
  202  *
  203  *      This structure describes the set of registers that must
  204  *      be pushed on the current ring-0 stack by an interrupt before
  205  *      we can switch to the interrupt stack.
  206  */
  207 
  208 struct i386_interrupt_state {
  209         int     es;
  210         int     ds;
  211         int     edx;
  212         int     ecx;
  213         int     eax;
  214         int     eip;
  215         int     cs;
  216         int     efl;
  217 };
  218 
  219 /*
  220  *      i386_machine_state:
  221  *
  222  *      This structure corresponds to special machine state.
  223  *      It lives in the pcb.  It is not saved by default.
  224  */
  225 
  226 struct i386_machine_state {
  227         iopb_tss_t              io_tss;
  228         struct user_ldt *       ldt;
  229         struct i386_fpsave_state *ifps;
  230         struct v86_assist_state v86s;
  231 };
  232 
  233 typedef struct pcb {
  234         struct i386_interrupt_state iis[2];     /* interrupt and NMI */
  235         struct i386_saved_state iss;
  236         struct i386_machine_state ims;
  237         decl_simple_lock_data(, lock)
  238 } *pcb_t;
  239 
  240 /*
  241  *      On the kernel stack is:
  242  *      stack:  ...
  243  *              struct i386_exception_link
  244  *              struct i386_kernel_state
  245  *      stack+KERNEL_STACK_SIZE
  246  */
  247 
  248 #define STACK_IKS(stack)        \
  249         ((struct i386_kernel_state *)((stack) + KERNEL_STACK_SIZE) - 1)
  250 #define STACK_IEL(stack)        \
  251         ((struct i386_exception_link *)STACK_IKS(stack) - 1)
  252 
  253 #define USER_REGS(thread)       (&(thread)->pcb->iss)
  254 
  255 #define INTERRUPTED_PC(thread)  (USER_REGS(thread)->eip)
  256 
  257 #define syscall_emulation_sync(task)    /* do nothing */
  258 
  259 #endif  /* _I386_THREAD_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/i386/thread.h

FreeBSD/Linux Kernel Cross Reference
sys/i386/thread.h