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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  */
  12 #ifndef _ASM_IA64_MCA_ASM_H
  13 #define _ASM_IA64_MCA_ASM_H
  14
  15 #define PSR_IC          13
  16 #define PSR_I           14
  17 #define PSR_DT          17
  18 #define PSR_RT          27
  19 #define PSR_MC          35
  20 #define PSR_IT          36
  21 #define PSR_BN          44
  22
  23 /*
  24  * This macro converts a instruction virtual address to a physical address
  25  * Right now for simulation purposes the virtual addresses are
  26  * direct mapped to physical addresses.
  27  *      1. Lop off bits 61 thru 63 in the virtual address
  28  */
  29 #define INST_VA_TO_PA(addr)                                                     \
  30         dep     addr    = 0, addr, 61, 3
  31 /*
  32  * This macro converts a data virtual address to a physical address
  33  * Right now for simulation purposes the virtual addresses are
  34  * direct mapped to physical addresses.
  35  *      1. Lop off bits 61 thru 63 in the virtual address
  36  */
  37 #define DATA_VA_TO_PA(addr)                                                     \
  38         tpa     addr    = addr
  39 /*
  40  * This macro converts a data physical address to a virtual address
  41  * Right now for simulation purposes the virtual addresses are
  42  * direct mapped to physical addresses.
  43  *      1. Put 0x7 in bits 61 thru 63.
  44  */
  45 #define DATA_PA_TO_VA(addr,temp)                                                        \
  46         mov     temp    = 0x7   ;;                                                      \
  47         dep     addr    = temp, addr, 61, 3
  48
  49 #define GET_THIS_PADDR(reg, var)                \
  50         mov     reg = IA64_KR(PER_CPU_DATA);;   \
  51         addl    reg = THIS_CPU(var), reg
  52
  53 /*
  54  * This macro jumps to the instruction at the given virtual address
  55  * and starts execution in physical mode with all the address
  56  * translations turned off.
  57  *      1.      Save the current psr
  58  *      2.      Make sure that all the upper 32 bits are off
  59  *
  60  *      3.      Clear the interrupt enable and interrupt state collection bits
  61  *              in the psr before updating the ipsr and iip.
  62  *
  63  *      4.      Turn off the instruction, data and rse translation bits of the psr
  64  *              and store the new value into ipsr
  65  *              Also make sure that the interrupts are disabled.
  66  *              Ensure that we are in little endian mode.
  67  *              [psr.{rt, it, dt, i, be} = 0]
  68  *
  69  *      5.      Get the physical address corresponding to the virtual address
  70  *              of the next instruction bundle and put it in iip.
  71  *              (Using magic numbers 24 and 40 in the deposint instruction since
  72  *               the IA64_SDK code directly maps to lower 24bits as physical address
  73  *               from a virtual address).
  74  *
  75  *      6.      Do an rfi to move the values from ipsr to psr and iip to ip.
  76  */
  77 #define  PHYSICAL_MODE_ENTER(temp1, temp2, start_addr, old_psr)                         \
  78         mov     old_psr = psr;                                                          \
  79         ;;                                                                              \
  80         dep     old_psr = 0, old_psr, 32, 32;                                           \
  81                                                                                         \
  82         mov     ar.rsc = 0 ;                                                            \
  83         ;;                                                                              \
  84         srlz.d;                                                                         \
  85         mov     temp2 = ar.bspstore;                                                    \
  86         ;;                                                                              \
  87         DATA_VA_TO_PA(temp2);                                                           \
  88         ;;                                                                              \
  89         mov     temp1 = ar.rnat;                                                        \
  90         ;;                                                                              \
  91         mov     ar.bspstore = temp2;                                                    \
  92         ;;                                                                              \
  93         mov     ar.rnat = temp1;                                                        \
  94         mov     temp1 = psr;                                                            \
  95         mov     temp2 = psr;                                                            \
  96         ;;                                                                              \
  97                                                                                         \
  98         dep     temp2 = 0, temp2, PSR_IC, 2;                                            \
  99         ;;                                                                              \
 100         mov     psr.l = temp2;                                                          \
 101         ;;                                                                              \
 102         srlz.d;                                                                         \
 103         dep     temp1 = 0, temp1, 32, 32;                                               \
 104         ;;                                                                              \
 105         dep     temp1 = 0, temp1, PSR_IT, 1;                                            \
 106         ;;                                                                              \
 107         dep     temp1 = 0, temp1, PSR_DT, 1;                                            \
 108         ;;                                                                              \
 109         dep     temp1 = 0, temp1, PSR_RT, 1;                                            \
 110         ;;                                                                              \
 111         dep     temp1 = 0, temp1, PSR_I, 1;                                             \
 112         ;;                                                                              \
 113         dep     temp1 = 0, temp1, PSR_IC, 1;                                            \
 114         ;;                                                                              \
 115         dep     temp1 = -1, temp1, PSR_MC, 1;                                           \
 116         ;;                                                                              \
 117         mov     cr.ipsr = temp1;                                                        \
 118         ;;                                                                              \
 119         LOAD_PHYSICAL(p0, temp2, start_addr);                                           \
 120         ;;                                                                              \
 121         mov     cr.iip = temp2;                                                         \
 122         mov     cr.ifs = r0;                                                            \
 123         DATA_VA_TO_PA(sp);                                                              \
 124         DATA_VA_TO_PA(gp);                                                              \
 125         ;;                                                                              \
 126         srlz.i;                                                                         \
 127         ;;                                                                              \
 128         nop     1;                                                                      \
 129         nop     2;                                                                      \
 130         nop     1;                                                                      \
 131         nop     2;                                                                      \
 132         rfi;                                                                            \
 133         ;;
 134
 135 /*
 136  * This macro jumps to the instruction at the given virtual address
 137  * and starts execution in virtual mode with all the address
 138  * translations turned on.
 139  *      1.      Get the old saved psr
 140  *
 141  *      2.      Clear the interrupt state collection bit in the current psr.
 142  *
 143  *      3.      Set the instruction translation bit back in the old psr
 144  *              Note we have to do this since we are right now saving only the
 145  *              lower 32-bits of old psr.(Also the old psr has the data and
 146  *              rse translation bits on)
 147  *
 148  *      4.      Set ipsr to this old_psr with "it" bit set and "bn" = 1.
 149  *
 150  *      5.      Reset the current thread pointer (r13).
 151  *
 152  *      6.      Set iip to the virtual address of the next instruction bundle.
 153  *
 154  *      7.      Do an rfi to move ipsr to psr and iip to ip.
 155  */
 156
 157 #define VIRTUAL_MODE_ENTER(temp1, temp2, start_addr, old_psr)   \
 158         mov     temp2 = psr;                                    \
 159         ;;                                                      \
 160         mov     old_psr = temp2;                                \
 161         ;;                                                      \
 162         dep     temp2 = 0, temp2, PSR_IC, 2;                    \
 163         ;;                                                      \
 164         mov     psr.l = temp2;                                  \
 165         mov     ar.rsc = 0;                                     \
 166         ;;                                                      \
 167         srlz.d;                                                 \
 168         mov     r13 = ar.k6;                                    \
 169         mov     temp2 = ar.bspstore;                            \
 170         ;;                                                      \
 171         DATA_PA_TO_VA(temp2,temp1);                             \
 172         ;;                                                      \
 173         mov     temp1 = ar.rnat;                                \
 174         ;;                                                      \
 175         mov     ar.bspstore = temp2;                            \
 176         ;;                                                      \
 177         mov     ar.rnat = temp1;                                \
 178         ;;                                                      \
 179         mov     temp1 = old_psr;                                \
 180         ;;                                                      \
 181         mov     temp2 = 1;                                      \
 182         ;;                                                      \
 183         dep     temp1 = temp2, temp1, PSR_IC, 1;                \
 184         ;;                                                      \
 185         dep     temp1 = temp2, temp1, PSR_IT, 1;                \
 186         ;;                                                      \
 187         dep     temp1 = temp2, temp1, PSR_DT, 1;                \
 188         ;;                                                      \
 189         dep     temp1 = temp2, temp1, PSR_RT, 1;                \
 190         ;;                                                      \
 191         dep     temp1 = temp2, temp1, PSR_BN, 1;                \
 192         ;;                                                      \
 193                                                                 \
 194         mov     cr.ipsr = temp1;                                \
 195         movl    temp2 = start_addr;                             \
 196         ;;                                                      \
 197         mov     cr.iip = temp2;                                 \
 198         ;;                                                      \
 199         DATA_PA_TO_VA(sp, temp1);                               \
 200         DATA_PA_TO_VA(gp, temp2);                               \
 201         srlz.i;                                                 \
 202         ;;                                                      \
 203         nop     1;                                              \
 204         nop     2;                                              \
 205         nop     1;                                              \
 206         rfi                                                     \
 207         ;;
 208
 209 /*
 210  * The following offsets capture the order in which the
 211  * RSE related registers from the old context are
 212  * saved onto the new stack frame.
 213  *
 214  *      +-----------------------+
 215  *      |NDIRTY [BSP - BSPSTORE]|
 216  *      +-----------------------+
 217  *      |       RNAT            |
 218  *      +-----------------------+
 219  *      |       BSPSTORE        |
 220  *      +-----------------------+
 221  *      |       IFS             |
 222  *      +-----------------------+
 223  *      |       PFS             |
 224  *      +-----------------------+
 225  *      |       RSC             |
 226  *      +-----------------------+ <-------- Bottom of new stack frame
 227  */
 228 #define  rse_rsc_offset         0
 229 #define  rse_pfs_offset         (rse_rsc_offset+0x08)
 230 #define  rse_ifs_offset         (rse_pfs_offset+0x08)
 231 #define  rse_bspstore_offset    (rse_ifs_offset+0x08)
 232 #define  rse_rnat_offset        (rse_bspstore_offset+0x08)
 233 #define  rse_ndirty_offset      (rse_rnat_offset+0x08)
 234
 235 /*
 236  * rse_switch_context
 237  *
 238  *      1. Save old RSC onto the new stack frame
 239  *      2. Save PFS onto new stack frame
 240  *      3. Cover the old frame and start a new frame.
 241  *      4. Save IFS onto new stack frame
 242  *      5. Save the old BSPSTORE on the new stack frame
 243  *      6. Save the old RNAT on the new stack frame
 244  *      7. Write BSPSTORE with the new backing store pointer
 245  *      8. Read and save the new BSP to calculate the #dirty registers
 246  * NOTE: Look at pages 11-10, 11-11 in PRM Vol 2
 247  */
 248 #define rse_switch_context(temp,p_stackframe,p_bspstore)                        \
 249         ;;                                                                      \
 250         mov     temp=ar.rsc;;                                                   \
 251         st8     [p_stackframe]=temp,8;;                                 \
 252         mov     temp=ar.pfs;;                                                   \
 253         st8     [p_stackframe]=temp,8;                                          \
 254         cover ;;                                                                \
 255         mov     temp=cr.ifs;;                                                   \
 256         st8     [p_stackframe]=temp,8;;                                         \
 257         mov     temp=ar.bspstore;;                                              \
 258         st8     [p_stackframe]=temp,8;;                                 \
 259         mov     temp=ar.rnat;;                                                  \
 260         st8     [p_stackframe]=temp,8;                                          \
 261         mov     ar.bspstore=p_bspstore;;                                        \
 262         mov     temp=ar.bsp;;                                                   \
 263         sub     temp=temp,p_bspstore;;                                          \
 264         st8     [p_stackframe]=temp,8;;
 265
 266 /*
 267  * rse_return_context
 268  *      1. Allocate a zero-sized frame
 269  *      2. Store the number of dirty registers RSC.loadrs field
 270  *      3. Issue a loadrs to insure that any registers from the interrupted
 271  *         context which were saved on the new stack frame have been loaded
 272  *         back into the stacked registers
 273  *      4. Restore BSPSTORE
 274  *      5. Restore RNAT
 275  *      6. Restore PFS
 276  *      7. Restore IFS
 277  *      8. Restore RSC
 278  *      9. Issue an RFI
 279  */
 280 #define rse_return_context(psr_mask_reg,temp,p_stackframe)                      \
 281         ;;                                                                      \
 282         alloc   temp=ar.pfs,0,0,0,0;                                            \
 283         add     p_stackframe=rse_ndirty_offset,p_stackframe;;                   \
 284         ld8     temp=[p_stackframe];;                                           \
 285         shl     temp=temp,16;;                                                  \
 286         mov     ar.rsc=temp;;                                                   \
 287         loadrs;;                                                                \
 288         add     p_stackframe=-rse_ndirty_offset+rse_bspstore_offset,p_stackframe;;\
 289         ld8     temp=[p_stackframe];;                                           \
 290         mov     ar.bspstore=temp;;                                              \
 291         add     p_stackframe=-rse_bspstore_offset+rse_rnat_offset,p_stackframe;;\
 292         ld8     temp=[p_stackframe];;                                           \
 293         mov     ar.rnat=temp;;                                                  \
 294         add     p_stackframe=-rse_rnat_offset+rse_pfs_offset,p_stackframe;;     \
 295         ld8     temp=[p_stackframe];;                                           \
 296         mov     ar.pfs=temp;;                                                   \
 297         add     p_stackframe=-rse_pfs_offset+rse_ifs_offset,p_stackframe;;      \
 298         ld8     temp=[p_stackframe];;                                           \
 299         mov     cr.ifs=temp;;                                                   \
 300         add     p_stackframe=-rse_ifs_offset+rse_rsc_offset,p_stackframe;;      \
 301         ld8     temp=[p_stackframe];;                                           \
 302         mov     ar.rsc=temp ;                                                   \
 303         mov     temp=psr;;                                                      \
 304         or      temp=temp,psr_mask_reg;;                                        \
 305         mov     cr.ipsr=temp;;                                                  \
 306         mov     temp=ip;;                                                       \
 307         add     temp=0x30,temp;;                                                \
 308         mov     cr.iip=temp;;                                                   \
 309         srlz.i;;                                                                \
 310         rfi;;
 311
 312 #endif /* _ASM_IA64_MCA_ASM_H */