arch/powerpc/include/asm/exception-64s.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef _ASM_POWERPC_EXCEPTION_H
   3 #define _ASM_POWERPC_EXCEPTION_H
   4 /*
   5  * Extracted from head_64.S
   6  *
   7  *  PowerPC version
   8  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   9  *
  10  *  Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
  11  *    Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
  12  *  Adapted for Power Macintosh by Paul Mackerras.
  13  *  Low-level exception handlers and MMU support
  14  *  rewritten by Paul Mackerras.
  15  *    Copyright (C) 1996 Paul Mackerras.
  16  *
  17  *  Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
  18  *    Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
  19  *
  20  *  This file contains the low-level support and setup for the
  21  *  PowerPC-64 platform, including trap and interrupt dispatch.
  22  */
  23 /*
  24  * The following macros define the code that appears as
  25  * the prologue to each of the exception handlers.  They
  26  * are split into two parts to allow a single kernel binary
  27  * to be used for pSeries and iSeries.
  28  *
  29  * We make as much of the exception code common between native
  30  * exception handlers (including pSeries LPAR) and iSeries LPAR
  31  * implementations as possible.
  32  */
  33 #include <asm/feature-fixups.h>
  34
  35 /* PACA save area size in u64 units (exgen, exmc, etc) */
  36 #if defined(CONFIG_RELOCATABLE)
  37 #define EX_SIZE         10
  38 #else
  39 #define EX_SIZE         9
  40 #endif
  41
  42 /*
  43  * maximum recursive depth of MCE exceptions
  44  */
  45 #define MAX_MCE_DEPTH   4
  46
  47 #ifdef __ASSEMBLY__
  48
  49 #define STF_ENTRY_BARRIER_SLOT                                          \
  50         STF_ENTRY_BARRIER_FIXUP_SECTION;                                \
  51         nop;                                                            \
  52         nop;                                                            \
  53         nop
  54
  55 #define STF_EXIT_BARRIER_SLOT                                           \
  56         STF_EXIT_BARRIER_FIXUP_SECTION;                                 \
  57         nop;                                                            \
  58         nop;                                                            \
  59         nop;                                                            \
  60         nop;                                                            \
  61         nop;                                                            \
  62         nop
  63
  64 /*
  65  * r10 must be free to use, r13 must be paca
  66  */
  67 #define INTERRUPT_TO_KERNEL                                             \
  68         STF_ENTRY_BARRIER_SLOT
  69
  70 /*
  71  * Macros for annotating the expected destination of (h)rfid
  72  *
  73  * The nop instructions allow us to insert one or more instructions to flush the
  74  * L1-D cache when returning to userspace or a guest.
  75  */
  76 #define RFI_FLUSH_SLOT                                                  \
  77         RFI_FLUSH_FIXUP_SECTION;                                        \
  78         nop;                                                            \
  79         nop;                                                            \
  80         nop
  81
  82 #define RFI_TO_KERNEL                                                   \
  83         rfid
  84
  85 #define RFI_TO_USER                                                     \
  86         STF_EXIT_BARRIER_SLOT;                                          \
  87         RFI_FLUSH_SLOT;                                                 \
  88         rfid;                                                           \
  89         b       rfi_flush_fallback
  90
  91 #define RFI_TO_USER_OR_KERNEL                                           \
  92         STF_EXIT_BARRIER_SLOT;                                          \
  93         RFI_FLUSH_SLOT;                                                 \
  94         rfid;                                                           \
  95         b       rfi_flush_fallback
  96
  97 #define RFI_TO_GUEST                                                    \
  98         STF_EXIT_BARRIER_SLOT;                                          \
  99         RFI_FLUSH_SLOT;                                                 \
 100         rfid;                                                           \
 101         b       rfi_flush_fallback
 102
 103 #define HRFI_TO_KERNEL                                                  \
 104         hrfid
 105
 106 #define HRFI_TO_USER                                                    \
 107         STF_EXIT_BARRIER_SLOT;                                          \
 108         RFI_FLUSH_SLOT;                                                 \
 109         hrfid;                                                          \
 110         b       hrfi_flush_fallback
 111
 112 #define HRFI_TO_USER_OR_KERNEL                                          \
 113         STF_EXIT_BARRIER_SLOT;                                          \
 114         RFI_FLUSH_SLOT;                                                 \
 115         hrfid;                                                          \
 116         b       hrfi_flush_fallback
 117
 118 #define HRFI_TO_GUEST                                                   \
 119         STF_EXIT_BARRIER_SLOT;                                          \
 120         RFI_FLUSH_SLOT;                                                 \
 121         hrfid;                                                          \
 122         b       hrfi_flush_fallback
 123
 124 #define HRFI_TO_UNKNOWN                                                 \
 125         STF_EXIT_BARRIER_SLOT;                                          \
 126         RFI_FLUSH_SLOT;                                                 \
 127         hrfid;                                                          \
 128         b       hrfi_flush_fallback
 129
 130 #endif /* __ASSEMBLY__ */
 131
 132 #endif  /* _ASM_POWERPC_EXCEPTION_H */