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      1  1.16     pooka /*	$NetBSD: pcb.h,v 1.16 2009/10/13 22:41:57 pooka Exp $ */
      2   1.1       eeh 
      3   1.1       eeh /*
      4   1.1       eeh  * Copyright (c) 1992, 1993
      5   1.1       eeh  *	The Regents of the University of California.  All rights reserved.
      6  1.10       agc  *
      7  1.10       agc  * This software was developed by the Computer Systems Engineering group
      8  1.10       agc  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9  1.10       agc  * contributed to Berkeley.
     10  1.10       agc  *
     11  1.10       agc  * All advertising materials mentioning features or use of this software
     12  1.10       agc  * must display the following acknowledgement:
     13  1.10       agc  *	This product includes software developed by the University of
     14  1.10       agc  *	California, Lawrence Berkeley Laboratory.
     15  1.10       agc  *
     16  1.10       agc  * Redistribution and use in source and binary forms, with or without
     17  1.10       agc  * modification, are permitted provided that the following conditions
     18  1.10       agc  * are met:
     19  1.10       agc  * 1. Redistributions of source code must retain the above copyright
     20  1.10       agc  *    notice, this list of conditions and the following disclaimer.
     21  1.10       agc  * 2. Redistributions in binary form must reproduce the above copyright
     22  1.10       agc  *    notice, this list of conditions and the following disclaimer in the
     23  1.10       agc  *    documentation and/or other materials provided with the distribution.
     24  1.10       agc  * 3. Neither the name of the University nor the names of its contributors
     25  1.10       agc  *    may be used to endorse or promote products derived from this software
     26  1.10       agc  *    without specific prior written permission.
     27  1.10       agc  *
     28  1.10       agc  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     29  1.10       agc  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     30  1.10       agc  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     31  1.10       agc  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     32  1.10       agc  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     33  1.10       agc  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     34  1.10       agc  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     35  1.10       agc  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     36  1.10       agc  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     37  1.10       agc  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38  1.10       agc  * SUCH DAMAGE.
     39  1.10       agc  *
     40  1.10       agc  *	@(#)pcb.h	8.1 (Berkeley) 6/11/93
     41  1.10       agc  */
     42  1.10       agc 
     43  1.10       agc /*
     44  1.10       agc  * Copyright (c) 1996-2002 Eduardo Horvath.  All rights reserved.
     45   1.1       eeh  *
     46   1.1       eeh  * Redistribution and use in source and binary forms, with or without
     47   1.1       eeh  * modification, are permitted provided that the following conditions
     48   1.1       eeh  * are met:
     49   1.1       eeh  * 1. Redistributions of source code must retain the above copyright
     50   1.1       eeh  *    notice, this list of conditions and the following disclaimer.
     51   1.1       eeh  * 2. Redistributions in binary form must reproduce the above copyright
     52   1.1       eeh  *    notice, this list of conditions and the following disclaimer in the
     53   1.1       eeh  *    documentation and/or other materials provided with the distribution.
     54  1.12       eeh  * 3. Neither the name of the author nor the names of its contributors
     55   1.1       eeh  *    may be used to endorse or promote products derived from this software
     56   1.1       eeh  *    without specific prior written permission.
     57   1.1       eeh  *
     58  1.12       eeh  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     59   1.1       eeh  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     60   1.1       eeh  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     61   1.1       eeh  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     62   1.1       eeh  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     63   1.1       eeh  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     64   1.1       eeh  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     65   1.1       eeh  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     66   1.1       eeh  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     67   1.1       eeh  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     68   1.1       eeh  * SUCH DAMAGE.
     69   1.1       eeh  *
     70   1.1       eeh  *	@(#)pcb.h	8.1 (Berkeley) 6/11/93
     71   1.1       eeh  */
     72   1.1       eeh 
     73  1.16     pooka #ifndef _SPARC64_PCB_H_
     74  1.16     pooka #define _SPARC64_PCB_H_
     75  1.16     pooka 
     76   1.1       eeh #include <machine/reg.h>
     77   1.1       eeh 
     78   1.1       eeh #ifdef notyet
     79   1.1       eeh #define	PCB_MAXWIN	32	/* architectural limit */
     80   1.1       eeh #else
     81   1.1       eeh #define	PCB_MAXWIN	8	/* worried about u area sizes ... */
     82   1.1       eeh #endif
     83   1.1       eeh 
     84   1.1       eeh /*
     85   1.1       eeh  * SPARC Process Control Block.
     86   1.1       eeh  *
     87   1.1       eeh  * pcb_uw is positive if there are any user windows that are
     88   1.1       eeh  * are currently in the CPU windows rather than on the user
     89   1.1       eeh  * stack.  Whenever we are running in the kernel with traps
     90   1.1       eeh  * enabled, we decrement pcb_uw for each ``push'' of a CPU
     91   1.1       eeh  * register window into the stack, and we increment it for
     92   1.1       eeh  * each ``pull'' from the stack into the CPU.  (If traps are
     93   1.1       eeh  * disabled, or if we are in user mode, pcb_uw is junk.)
     94   1.1       eeh  *
     95   1.1       eeh  * To ease computing pcb_uw on traps from user mode, we keep track
     96   1.1       eeh  * of the log base 2 of the single bit that is set in %wim.
     97   1.1       eeh  *
     98   1.1       eeh  * If an overflow occurs while the associated user stack pages
     99   1.1       eeh  * are invalid (paged out), we have to store the registers
    100   1.1       eeh  * in a page that is locked in core while the process runs,
    101   1.1       eeh  * i.e., right here in the pcb.  We also need the stack pointer
    102   1.1       eeh  * for the last such window (but only the last, as the others
    103   1.1       eeh  * are in each window) and the count of windows saved.  We
    104   1.1       eeh  * cheat by having a whole window structure for that one %sp.
    105   1.1       eeh  * Thus, to save window pcb_rw[i] to memory, we write it at
    106   1.1       eeh  * pcb_rw[i + 1].rw_in[6].
    107   1.1       eeh  *
    108   1.1       eeh  * pcb_nsaved has three `kinds' of values.  If 0, it means no
    109   1.1       eeh  * registers are in the PCB (though if pcb_uw is positive,
    110   1.1       eeh  * there may be the next time you look).  If positive, it means
    111   1.1       eeh  * there are no user registers in the CPU, but there are some
    112   1.1       eeh  * saved in pcb_rw[].  As a special case, traps that needed
    113   1.1       eeh  * assistance to pull user registers from the stack also store
    114   1.1       eeh  * the registers in pcb_rw[], and set pcb_nsaved to -1.  This
    115   1.1       eeh  * special state is normally short-term: it can only last until the
    116   1.1       eeh  * trap returns, and it can never persist across entry to user code.
    117   1.1       eeh  */
    118   1.1       eeh /*
    119   1.1       eeh  * v9 addendum:
    120   1.1       eeh  *
    121   1.1       eeh  * Window handling between v8 and v9 has changed somewhat.  There
    122   1.1       eeh  * is no %wim.  Instead, we have a %cwp, %cansave, %canrestore,
    123   1.1       eeh  * %cleanwin, and %otherwin.  By definition:
    124   1.1       eeh  *
    125   1.1       eeh  *	 %cansave + %canrestore + %otherwin = NWINDOWS - 2
    126   1.1       eeh  *
    127   1.1       eeh  * In addition, %cleanwin >= %canrestore since restorable windows
    128   1.1       eeh  * are considered clean.  This means that by storing %canrestore
    129   1.1       eeh  * and %otherwin, we should be able to compute the values of all
    130   1.1       eeh  * the other registers.
    131   1.1       eeh  *
    132   1.1       eeh  * The only other register we need to save is %cwp because it cannot
    133   1.1       eeh  * be trivially computed from the other registers.  The %cwp is
    134   1.1       eeh  * stored in the %tstate register, but if the machine was in a register
    135   1.1       eeh  * window spill/fill handler, the value of that %cwp may be off by
    136   1.1       eeh  * as much as 2 register windows.  We will also store %cwp.  [We will
    137   1.1       eeh  * try to steal pcb_uw or pcb_nsaved for this purpose eventually.]
    138   1.1       eeh  *
    139   1.1       eeh  * To calculate what registers are in the pcb, start with pcb_cwp
    140   1.1       eeh  * and proceed to (pcb_cwp - pcb_canrestore) % NWINDOWS.  These should
    141   1.1       eeh  * be saved to their appropriate register windows.  The client routine
    142   1.1       eeh  * (trap handler) is responsible for saving pcb_cwp + 1 [%o1-%o7] in
    143   1.1       eeh  * the trap frame or on the stack.
    144   1.1       eeh  *
    145   1.1       eeh  *
    146   1.1       eeh  * Even more addendum:
    147   1.1       eeh  *
    148   1.1       eeh  * With the new system for keeping track of register windows we don't
    149   1.1       eeh  * care about anything other than pcb_uw which keeps track of how many
    150   1.1       eeh  * full windows we have.  As soon as a flush traps, we dump all user
    151   1.1       eeh  * windows to the pcb, handle the fault, then restore all user windows.
    152   1.1       eeh  *
    153   1.1       eeh  * XXX we are using pcb_nsaved as the counter.  pcb_uw is still a mask.
    154   1.1       eeh  * change this as soon as the new scheme is debugged.
    155   1.1       eeh  */
    156   1.1       eeh struct pcb {
    157  1.14       cdi 	uint64_t	pcb_sp;		/* sp (%o6) when switch() was called */
    158  1.14       cdi 	uint64_t	pcb_pc;		/* pc (%o7) when switch() was called */
    159  1.15  christos 	void *	pcb_onfault;	/* for copyin/out */
    160   1.1       eeh 	short	pcb_pstate;	/* %pstate when switch() was called -- may be useful if we support multiple memory models */
    161   1.1       eeh 	char	pcb_nsaved;	/* number of windows saved in pcb */
    162   1.1       eeh 
    163   1.1       eeh 	/* The rest is probably not needed except for pcb_rw */
    164   1.1       eeh 	char	pcb_cwp;	/* %cwp when switch() was called */
    165   1.1       eeh 	char	pcb_pil;	/* %pil when switch() was called -- prolly not needed */
    166   1.1       eeh 
    167   1.6       mrg 	const char *lastcall;	/* DEBUG -- name of last system call */
    168   1.1       eeh 	/* the following MUST be aligned on a 64-bit boundary */
    169   1.1       eeh 	struct	rwindow64 pcb_rw[PCB_MAXWIN];	/* saved windows */
    170   1.1       eeh };
    171   1.1       eeh 
    172   1.1       eeh /*
    173   1.1       eeh  * The pcb is augmented with machine-dependent additional data for
    174   1.1       eeh  * core dumps.  Note that the trapframe here is a copy of the one
    175   1.1       eeh  * from the top of the kernel stack (included here so that the kernel
    176   1.1       eeh  * stack itself need not be dumped).
    177   1.1       eeh  */
    178   1.3       eeh struct md_coredump32 {
    179   1.3       eeh 	struct	trapframe32 md_tf;
    180   1.3       eeh 	struct	fpstate32 md_fpstate;
    181   1.3       eeh };
    182   1.3       eeh 
    183   1.1       eeh struct md_coredump {
    184   1.9       eeh 	struct	trapframe64 md_tf;
    185   1.3       eeh 	struct	fpstate64 md_fpstate;
    186   1.1       eeh };
    187   1.1       eeh 
    188  1.11       cdi #ifndef _KERNEL
    189   1.2       eeh /* Let gdb compile.  We need fancier macros to make these make sense. */
    190   1.2       eeh #define pcb_psr	pcb_pstate
    191   1.2       eeh #define pcb_wim	pcb_cwp
    192   1.1       eeh #endif /* _KERNEL */
    193  1.16     pooka 
    194  1.16     pooka #endif /* _SPARC64_PCB_H_ */
    195