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