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   1 /*
   2  * File:        mca_asm.h
   3  * Purpose:     Machine check handling specific defines
   4  *
   5  * Copyright (C) 1999 Silicon Graphics, Inc.
   6  * Copyright (C) Vijay Chander <vijay@engr.sgi.com>
   7  * Copyright (C) Srinivasa Thirumalachar <sprasad@engr.sgi.com>
   8  * Copyright (C) 2000 Hewlett-Packard Co.
   9  * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
  10  * Copyright (C) 2002 Intel Corp.
  11  * Copyright (C) 2002 Jenna Hall <jenna.s.hall@intel.com>
  12  * Copyright (C) 2005 Silicon Graphics, Inc
  13  * Copyright (C) 2005 Keith Owens <kaos@sgi.com>
  14  */
  15 #ifndef _ASM_IA64_MCA_ASM_H
  16 #define _ASM_IA64_MCA_ASM_H
  17
  18 #define PSR_IC          13
  19 #define PSR_I           14
  20 #define PSR_DT          17
  21 #define PSR_RT          27
  22 #define PSR_MC          35
  23 #define PSR_IT          36
  24 #define PSR_BN          44
  25
  26 /*
  27  * This macro converts a instruction virtual address to a physical address
  28  * Right now for simulation purposes the virtual addresses are
  29  * direct mapped to physical addresses.
  30  *      1. Lop off bits 61 thru 63 in the virtual address
  31  */
  32 #define INST_VA_TO_PA(addr)                                                     \
  33         dep     addr    = 0, addr, 61, 3
  34 /*
  35  * This macro converts a data virtual address to a physical address
  36  * Right now for simulation purposes the virtual addresses are
  37  * direct mapped to physical addresses.
  38  *      1. Lop off bits 61 thru 63 in the virtual address
  39  */
  40 #define DATA_VA_TO_PA(addr)                                                     \
  41         tpa     addr    = addr
  42 /*
  43  * This macro converts a data physical address to a virtual address
  44  * Right now for simulation purposes the virtual addresses are
  45  * direct mapped to physical addresses.
  46  *      1. Put 0x7 in bits 61 thru 63.
  47  */
  48 #define DATA_PA_TO_VA(addr,temp)                                                        \
  49         mov     temp    = 0x7   ;;                                                      \
  50         dep     addr    = temp, addr, 61, 3
  51
  52 #define GET_THIS_PADDR(reg, var)                \
  53         mov     reg = IA64_KR(PER_CPU_DATA);;   \
  54         addl    reg = THIS_CPU(var), reg
  55
  56 /*
  57  * This macro jumps to the instruction at the given virtual address
  58  * and starts execution in physical mode with all the address
  59  * translations turned off.
  60  *      1.      Save the current psr
  61  *      2.      Make sure that all the upper 32 bits are off
  62  *
  63  *      3.      Clear the interrupt enable and interrupt state collection bits
  64  *              in the psr before updating the ipsr and iip.
  65  *
  66  *      4.      Turn off the instruction, data and rse translation bits of the psr
  67  *              and store the new value into ipsr
  68  *              Also make sure that the interrupts are disabled.
  69  *              Ensure that we are in little endian mode.
  70  *              [psr.{rt, it, dt, i, be} = 0]
  71  *
  72  *      5.      Get the physical address corresponding to the virtual address
  73  *              of the next instruction bundle and put it in iip.
  74  *              (Using magic numbers 24 and 40 in the deposint instruction since
  75  *               the IA64_SDK code directly maps to lower 24bits as physical address
  76  *               from a virtual address).
  77  *
  78  *      6.      Do an rfi to move the values from ipsr to psr and iip to ip.
  79  */
  80 #define  PHYSICAL_MODE_ENTER(temp1, temp2, start_addr, old_psr)                         \
  81         mov     old_psr = psr;                                                          \
  82         ;;                                                                              \
  83         dep     old_psr = 0, old_psr, 32, 32;                                           \
  84                                                                                         \
  85         mov     ar.rsc = 0 ;                                                            \
  86         ;;                                                                              \
  87         srlz.d;                                                                         \
  88         mov     temp2 = ar.bspstore;                                                    \
  89         ;;                                                                              \
  90         DATA_VA_TO_PA(temp2);                                                           \
  91         ;;                                                                              \
  92         mov     temp1 = ar.rnat;                                                        \
  93         ;;                                                                              \
  94         mov     ar.bspstore = temp2;                                                    \
  95         ;;                                                                              \
  96         mov     ar.rnat = temp1;                                                        \
  97         mov     temp1 = psr;                                                            \
  98         mov     temp2 = psr;                                                            \
  99         ;;                                                                              \
 100                                                                                         \
 101         dep     temp2 = 0, temp2, PSR_IC, 2;                                            \
 102         ;;                                                                              \
 103         mov     psr.l = temp2;                                                          \
 104         ;;                                                                              \
 105         srlz.d;                                                                         \
 106         dep     temp1 = 0, temp1, 32, 32;                                               \
 107         ;;                                                                              \
 108         dep     temp1 = 0, temp1, PSR_IT, 1;                                            \
 109         ;;                                                                              \
 110         dep     temp1 = 0, temp1, PSR_DT, 1;                                            \
 111         ;;                                                                              \
 112         dep     temp1 = 0, temp1, PSR_RT, 1;                                            \
 113         ;;                                                                              \
 114         dep     temp1 = 0, temp1, PSR_I, 1;                                             \
 115         ;;                                                                              \
 116         dep     temp1 = 0, temp1, PSR_IC, 1;                                            \
 117         ;;                                                                              \
 118         dep     temp1 = -1, temp1, PSR_MC, 1;                                           \
 119         ;;                                                                              \
 120         mov     cr.ipsr = temp1;                                                        \
 121         ;;                                                                              \
 122         LOAD_PHYSICAL(p0, temp2, start_addr);                                           \
 123         ;;                                                                              \
 124         mov     cr.iip = temp2;                                                         \
 125         mov     cr.ifs = r0;                                                            \
 126         DATA_VA_TO_PA(sp);                                                              \
 127         DATA_VA_TO_PA(gp);                                                              \
 128         ;;                                                                              \
 129         srlz.i;                                                                         \
 130         ;;                                                                              \
 131         nop     1;                                                                      \
 132         nop     2;                                                                      \
 133         nop     1;                                                                      \
 134         nop     2;                                                                      \
 135         rfi;                                                                            \
 136         ;;
 137
 138 /*
 139  * This macro jumps to the instruction at the given virtual address
 140  * and starts execution in virtual mode with all the address
 141  * translations turned on.
 142  *      1.      Get the old saved psr
 143  *
 144  *      2.      Clear the interrupt state collection bit in the current psr.
 145  *
 146  *      3.      Set the instruction translation bit back in the old psr
 147  *              Note we have to do this since we are right now saving only the
 148  *              lower 32-bits of old psr.(Also the old psr has the data and
 149  *              rse translation bits on)
 150  *
 151  *      4.      Set ipsr to this old_psr with "it" bit set and "bn" = 1.
 152  *
 153  *      5.      Reset the current thread pointer (r13).
 154  *
 155  *      6.      Set iip to the virtual address of the next instruction bundle.
 156  *
 157  *      7.      Do an rfi to move ipsr to psr and iip to ip.
 158  */
 159
 160 #define VIRTUAL_MODE_ENTER(temp1, temp2, start_addr, old_psr)   \
 161         mov     temp2 = psr;                                    \
 162         ;;                                                      \
 163         mov     old_psr = temp2;                                \
 164         ;;                                                      \
 165         dep     temp2 = 0, temp2, PSR_IC, 2;                    \
 166         ;;                                                      \
 167         mov     psr.l = temp2;                                  \
 168         mov     ar.rsc = 0;                                     \
 169         ;;                                                      \
 170         srlz.d;                                                 \
 171         mov     r13 = ar.k6;                                    \
 172         mov     temp2 = ar.bspstore;                            \
 173         ;;                                                      \
 174         DATA_PA_TO_VA(temp2,temp1);                             \
 175         ;;                                                      \
 176         mov     temp1 = ar.rnat;                                \
 177         ;;                                                      \
 178         mov     ar.bspstore = temp2;                            \
 179         ;;                                                      \
 180         mov     ar.rnat = temp1;                                \
 181         ;;                                                      \
 182         mov     temp1 = old_psr;                                \
 183         ;;                                                      \
 184         mov     temp2 = 1;                                      \
 185         ;;                                                      \
 186         dep     temp1 = temp2, temp1, PSR_IC, 1;                \
 187         ;;                                                      \
 188         dep     temp1 = temp2, temp1, PSR_IT, 1;                \
 189         ;;                                                      \
 190         dep     temp1 = temp2, temp1, PSR_DT, 1;                \
 191         ;;                                                      \
 192         dep     temp1 = temp2, temp1, PSR_RT, 1;                \
 193         ;;                                                      \
 194         dep     temp1 = temp2, temp1, PSR_BN, 1;                \
 195         ;;                                                      \
 196                                                                 \
 197         mov     cr.ipsr = temp1;                                \
 198         movl    temp2 = start_addr;                             \
 199         ;;                                                      \
 200         mov     cr.iip = temp2;                                 \
 201         movl    gp = __gp                                       \
 202         ;;                                                      \
 203         DATA_PA_TO_VA(sp, temp1);                               \
 204         srlz.i;                                                 \
 205         ;;                                                      \
 206         nop     1;                                              \
 207         nop     2;                                              \
 208         nop     1;                                              \
 209         rfi                                                     \
 210         ;;
 211
 212 /*
 213  * The MCA and INIT stacks in struct ia64_mca_cpu look like normal kernel
 214  * stacks, except that the SAL/OS state and a switch_stack are stored near the
 215  * top of the MCA/INIT stack.  To support concurrent entry to MCA or INIT, as
 216  * well as MCA over INIT, each event needs its own SAL/OS state.  All entries
 217  * are 16 byte aligned.
 218  *
 219  *      +---------------------------+
 220  *      |          pt_regs          |
 221  *      +---------------------------+
 222  *      |        switch_stack       |
 223  *      +---------------------------+
 224  *      |        SAL/OS state       |
 225  *      +---------------------------+
 226  *      |    16 byte scratch area   |
 227  *      +---------------------------+ <-------- SP at start of C MCA handler
 228  *      |           .....           |
 229  *      +---------------------------+
 230  *      | RBS for MCA/INIT handler  |
 231  *      +---------------------------+
 232  *      | struct task for MCA/INIT  |
 233  *      +---------------------------+ <-------- Bottom of MCA/INIT stack
 234  */
 235
 236 #define ALIGN16(x)                      ((x)&~15)
 237 #define MCA_PT_REGS_OFFSET              ALIGN16(KERNEL_STACK_SIZE-IA64_PT_REGS_SIZE)
 238 #define MCA_SWITCH_STACK_OFFSET         ALIGN16(MCA_PT_REGS_OFFSET-IA64_SWITCH_STACK_SIZE)
 239 #define MCA_SOS_OFFSET                  ALIGN16(MCA_SWITCH_STACK_OFFSET-IA64_SAL_OS_STATE_SIZE)
 240 #define MCA_SP_OFFSET                   ALIGN16(MCA_SOS_OFFSET-16)
 241
 242 #endif /* _ASM_IA64_MCA_ASM_H */