kernel/arch/sparc/include/asm/trap_block.h

   1 #ifndef _SPARC_TRAP_BLOCK_H
   2 #define _SPARC_TRAP_BLOCK_H
   3
   4 #include <asm/hypervisor.h>
   5 #include <asm/asi.h>
   6
   7 #ifndef __ASSEMBLY__
   8
   9 /* Trap handling code needs to get at a few critical values upon
  10  * trap entry and to process TSB misses.  These cannot be in the
  11  * per_cpu() area as we really need to lock them into the TLB and
  12  * thus make them part of the main kernel image.  As a result we
  13  * try to make this as small as possible.
  14  *
  15  * This is padded out and aligned to 64-bytes to avoid false sharing
  16  * on SMP.
  17  */
  18
  19 /* If you modify the size of this structure, please update
  20  * TRAP_BLOCK_SZ_SHIFT below.
  21  */
  22 struct thread_info;
  23 struct trap_per_cpu {
  24 /* D-cache line 1: Basic thread information, cpu and device mondo queues */
  25         struct thread_info      *thread;
  26         unsigned long           pgd_paddr;
  27         unsigned long           cpu_mondo_pa;
  28         unsigned long           dev_mondo_pa;
  29
  30 /* D-cache line 2: Error Mondo Queue and kernel buffer pointers */
  31         unsigned long           resum_mondo_pa;
  32         unsigned long           resum_kernel_buf_pa;
  33         unsigned long           nonresum_mondo_pa;
  34         unsigned long           nonresum_kernel_buf_pa;
  35
  36 /* Dcache lines 3, 4, 5, and 6: Hypervisor Fault Status */
  37         struct hv_fault_status  fault_info;
  38
  39 /* Dcache line 7: Physical addresses of CPU send mondo block and CPU list.  */
  40         unsigned long           cpu_mondo_block_pa;
  41         unsigned long           cpu_list_pa;
  42         unsigned long           tsb_huge;
  43         unsigned long           tsb_huge_temp;
  44
  45 /* Dcache line 8: IRQ work list, and keep trap_block a power-of-2 in size.  */
  46         unsigned long           irq_worklist_pa;
  47         unsigned int            cpu_mondo_qmask;
  48         unsigned int            dev_mondo_qmask;
  49         unsigned int            resum_qmask;
  50         unsigned int            nonresum_qmask;
  51         unsigned long           __per_cpu_base;
  52 } __attribute__((aligned(64)));
  53 extern struct trap_per_cpu trap_block[NR_CPUS];
  54 void init_cur_cpu_trap(struct thread_info *);
  55 void setup_tba(void);
  56 extern int ncpus_probed;
  57
  58 unsigned long real_hard_smp_processor_id(void);
  59
  60 struct cpuid_patch_entry {
  61         unsigned int    addr;
  62         unsigned int    cheetah_safari[4];
  63         unsigned int    cheetah_jbus[4];
  64         unsigned int    starfire[4];
  65         unsigned int    sun4v[4];
  66 };
  67 extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;
  68
  69 struct sun4v_1insn_patch_entry {
  70         unsigned int    addr;
  71         unsigned int    insn;
  72 };
  73 extern struct sun4v_1insn_patch_entry __sun4v_1insn_patch,
  74         __sun4v_1insn_patch_end;
  75
  76 struct sun4v_2insn_patch_entry {
  77         unsigned int    addr;
  78         unsigned int    insns[2];
  79 };
  80 extern struct sun4v_2insn_patch_entry __sun4v_2insn_patch,
  81         __sun4v_2insn_patch_end;
  82 extern struct sun4v_2insn_patch_entry __sun_m7_2insn_patch,
  83         __sun_m7_2insn_patch_end;
  84
  85
  86 #endif /* !(__ASSEMBLY__) */
  87
  88 #define TRAP_PER_CPU_THREAD             0x00
  89 #define TRAP_PER_CPU_PGD_PADDR          0x08
  90 #define TRAP_PER_CPU_CPU_MONDO_PA       0x10
  91 #define TRAP_PER_CPU_DEV_MONDO_PA       0x18
  92 #define TRAP_PER_CPU_RESUM_MONDO_PA     0x20
  93 #define TRAP_PER_CPU_RESUM_KBUF_PA      0x28
  94 #define TRAP_PER_CPU_NONRESUM_MONDO_PA  0x30
  95 #define TRAP_PER_CPU_NONRESUM_KBUF_PA   0x38
  96 #define TRAP_PER_CPU_FAULT_INFO         0x40
  97 #define TRAP_PER_CPU_CPU_MONDO_BLOCK_PA 0xc0
  98 #define TRAP_PER_CPU_CPU_LIST_PA        0xc8
  99 #define TRAP_PER_CPU_TSB_HUGE           0xd0
 100 #define TRAP_PER_CPU_TSB_HUGE_TEMP      0xd8
 101 #define TRAP_PER_CPU_IRQ_WORKLIST_PA    0xe0
 102 #define TRAP_PER_CPU_CPU_MONDO_QMASK    0xe8
 103 #define TRAP_PER_CPU_DEV_MONDO_QMASK    0xec
 104 #define TRAP_PER_CPU_RESUM_QMASK        0xf0
 105 #define TRAP_PER_CPU_NONRESUM_QMASK     0xf4
 106 #define TRAP_PER_CPU_PER_CPU_BASE       0xf8
 107
 108 #define TRAP_BLOCK_SZ_SHIFT             8
 109
 110 #include <asm/scratchpad.h>
 111
 112 #define __GET_CPUID(REG)                                \
 113         /* Spitfire implementation (default). */        \
 114 661:    ldxa            [%g0] ASI_UPA_CONFIG, REG;      \
 115         srlx            REG, 17, REG;                   \
 116          and            REG, 0x1f, REG;                 \
 117         nop;                                            \
 118         .section        .cpuid_patch, "ax";             \
 119         /* Instruction location. */                     \
 120         .word           661b;                           \
 121         /* Cheetah Safari implementation. */            \
 122         ldxa            [%g0] ASI_SAFARI_CONFIG, REG;   \
 123         srlx            REG, 17, REG;                   \
 124         and             REG, 0x3ff, REG;                \
 125         nop;                                            \
 126         /* Cheetah JBUS implementation. */              \
 127         ldxa            [%g0] ASI_JBUS_CONFIG, REG;     \
 128         srlx            REG, 17, REG;                   \
 129         and             REG, 0x1f, REG;                 \
 130         nop;                                            \
 131         /* Starfire implementation. */                  \
 132         sethi           %hi(0x1fff40000d0 >> 9), REG;   \
 133         sllx            REG, 9, REG;                    \
 134         or              REG, 0xd0, REG;                 \
 135         lduwa           [REG] ASI_PHYS_BYPASS_EC_E, REG;\
 136         /* sun4v implementation. */                     \
 137         mov             SCRATCHPAD_CPUID, REG;          \
 138         ldxa            [REG] ASI_SCRATCHPAD, REG;      \
 139         nop;                                            \
 140         nop;                                            \
 141         .previous;
 142
 143 #ifdef CONFIG_SMP
 144
 145 #define TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 146         __GET_CPUID(TMP)                        \
 147         sethi   %hi(trap_block), DEST;          \
 148         sllx    TMP, TRAP_BLOCK_SZ_SHIFT, TMP;  \
 149         or      DEST, %lo(trap_block), DEST;    \
 150         add     DEST, TMP, DEST;                \
 151
 152 /* Clobbers TMP, current address space PGD phys address into DEST.  */
 153 #define TRAP_LOAD_PGD_PHYS(DEST, TMP)           \
 154         TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 155         ldx     [DEST + TRAP_PER_CPU_PGD_PADDR], DEST;
 156
 157 /* Clobbers TMP, loads local processor's IRQ work area into DEST.  */
 158 #define TRAP_LOAD_IRQ_WORK_PA(DEST, TMP)        \
 159         TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 160         add     DEST, TRAP_PER_CPU_IRQ_WORKLIST_PA, DEST;
 161
 162 /* Clobbers TMP, loads DEST with current thread info pointer.  */
 163 #define TRAP_LOAD_THREAD_REG(DEST, TMP)         \
 164         TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 165         ldx     [DEST + TRAP_PER_CPU_THREAD], DEST;
 166
 167 /* Given the current thread info pointer in THR, load the per-cpu
 168  * area base of the current processor into DEST.  REG1, REG2, and REG3 are
 169  * clobbered.
 170  *
 171  * You absolutely cannot use DEST as a temporary in this code.  The
 172  * reason is that traps can happen during execution, and return from
 173  * trap will load the fully resolved DEST per-cpu base.  This can corrupt
 174  * the calculations done by the macro mid-stream.
 175  */
 176 #define LOAD_PER_CPU_BASE(DEST, THR, REG1, REG2, REG3)  \
 177         lduh    [THR + TI_CPU], REG1;                   \
 178         sethi   %hi(trap_block), REG2;                  \
 179         sllx    REG1, TRAP_BLOCK_SZ_SHIFT, REG1;        \
 180         or      REG2, %lo(trap_block), REG2;            \
 181         add     REG2, REG1, REG2;                       \
 182         ldx     [REG2 + TRAP_PER_CPU_PER_CPU_BASE], DEST;
 183
 184 #else
 185
 186 #define TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 187         sethi   %hi(trap_block), DEST;          \
 188         or      DEST, %lo(trap_block), DEST;    \
 189
 190 /* Uniprocessor versions, we know the cpuid is zero.  */
 191 #define TRAP_LOAD_PGD_PHYS(DEST, TMP)           \
 192         TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 193         ldx     [DEST + TRAP_PER_CPU_PGD_PADDR], DEST;
 194
 195 /* Clobbers TMP, loads local processor's IRQ work area into DEST.  */
 196 #define TRAP_LOAD_IRQ_WORK_PA(DEST, TMP)        \
 197         TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 198         add     DEST, TRAP_PER_CPU_IRQ_WORKLIST_PA, DEST;
 199
 200 #define TRAP_LOAD_THREAD_REG(DEST, TMP)         \
 201         TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 202         ldx     [DEST + TRAP_PER_CPU_THREAD], DEST;
 203
 204 /* No per-cpu areas on uniprocessor, so no need to load DEST.  */
 205 #define LOAD_PER_CPU_BASE(DEST, THR, REG1, REG2, REG3)
 206
 207 #endif /* !(CONFIG_SMP) */
 208
 209 #endif /* _SPARC_TRAP_BLOCK_H */