arch/sparc/include/asm/trap_block.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _SPARC_TRAP_BLOCK_H
   3 #define _SPARC_TRAP_BLOCK_H
   4
   5 #include <asm/hypervisor.h>
   6 #include <asm/asi.h>
   7
   8 #ifndef __ASSEMBLY__
   9
  10 /* Trap handling code needs to get at a few critical values upon
  11  * trap entry and to process TSB misses.  These cannot be in the
  12  * per_cpu() area as we really need to lock them into the TLB and
  13  * thus make them part of the main kernel image.  As a result we
  14  * try to make this as small as possible.
  15  *
  16  * This is padded out and aligned to 64-bytes to avoid false sharing
  17  * on SMP.
  18  */
  19
  20 /* If you modify the size of this structure, please update
  21  * TRAP_BLOCK_SZ_SHIFT below.
  22  */
  23 struct thread_info;
  24 struct trap_per_cpu {
  25 /* D-cache line 1: Basic thread information, cpu and device mondo queues */
  26         struct thread_info      *thread;
  27         unsigned long           pgd_paddr;
  28         unsigned long           cpu_mondo_pa;
  29         unsigned long           dev_mondo_pa;
  30
  31 /* D-cache line 2: Error Mondo Queue and kernel buffer pointers */
  32         unsigned long           resum_mondo_pa;
  33         unsigned long           resum_kernel_buf_pa;
  34         unsigned long           nonresum_mondo_pa;
  35         unsigned long           nonresum_kernel_buf_pa;
  36
  37 /* Dcache lines 3, 4, 5, and 6: Hypervisor Fault Status */
  38         struct hv_fault_status  fault_info;
  39
  40 /* Dcache line 7: Physical addresses of CPU send mondo block and CPU list.  */
  41         unsigned long           cpu_mondo_block_pa;
  42         unsigned long           cpu_list_pa;
  43         unsigned long           tsb_huge;
  44         unsigned long           tsb_huge_temp;
  45
  46 /* Dcache line 8: IRQ work list, and keep trap_block a power-of-2 in size.  */
  47         unsigned long           irq_worklist_pa;
  48         unsigned int            cpu_mondo_qmask;
  49         unsigned int            dev_mondo_qmask;
  50         unsigned int            resum_qmask;
  51         unsigned int            nonresum_qmask;
  52         unsigned long           __per_cpu_base;
  53 } __attribute__((aligned(64)));
  54 extern struct trap_per_cpu trap_block[NR_CPUS];
  55 void init_cur_cpu_trap(struct thread_info *);
  56 void setup_tba(void);
  57 extern int ncpus_probed;
  58 extern u64 cpu_mondo_counter[NR_CPUS];
  59
  60 unsigned long real_hard_smp_processor_id(void);
  61
  62 struct cpuid_patch_entry {
  63         unsigned int    addr;
  64         unsigned int    cheetah_safari[4];
  65         unsigned int    cheetah_jbus[4];
  66         unsigned int    starfire[4];
  67         unsigned int    sun4v[4];
  68 };
  69 extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;
  70
  71 struct sun4v_1insn_patch_entry {
  72         unsigned int    addr;
  73         unsigned int    insn;
  74 };
  75 extern struct sun4v_1insn_patch_entry __sun4v_1insn_patch,
  76         __sun4v_1insn_patch_end;
  77 extern struct sun4v_1insn_patch_entry __fast_win_ctrl_1insn_patch,
  78         __fast_win_ctrl_1insn_patch_end;
  79 extern struct sun4v_1insn_patch_entry __sun_m7_1insn_patch,
  80         __sun_m7_1insn_patch_end;
  81
  82 struct sun4v_2insn_patch_entry {
  83         unsigned int    addr;
  84         unsigned int    insns[2];
  85 };
  86 extern struct sun4v_2insn_patch_entry __sun4v_2insn_patch,
  87         __sun4v_2insn_patch_end;
  88 extern struct sun4v_2insn_patch_entry __sun_m7_2insn_patch,
  89         __sun_m7_2insn_patch_end;
  90
  91
  92 #endif /* !(__ASSEMBLY__) */
  93
  94 #define TRAP_PER_CPU_THREAD             0x00
  95 #define TRAP_PER_CPU_PGD_PADDR          0x08
  96 #define TRAP_PER_CPU_CPU_MONDO_PA       0x10
  97 #define TRAP_PER_CPU_DEV_MONDO_PA       0x18
  98 #define TRAP_PER_CPU_RESUM_MONDO_PA     0x20
  99 #define TRAP_PER_CPU_RESUM_KBUF_PA      0x28
 100 #define TRAP_PER_CPU_NONRESUM_MONDO_PA  0x30
 101 #define TRAP_PER_CPU_NONRESUM_KBUF_PA   0x38
 102 #define TRAP_PER_CPU_FAULT_INFO         0x40
 103 #define TRAP_PER_CPU_CPU_MONDO_BLOCK_PA 0xc0
 104 #define TRAP_PER_CPU_CPU_LIST_PA        0xc8
 105 #define TRAP_PER_CPU_TSB_HUGE           0xd0
 106 #define TRAP_PER_CPU_TSB_HUGE_TEMP      0xd8
 107 #define TRAP_PER_CPU_IRQ_WORKLIST_PA    0xe0
 108 #define TRAP_PER_CPU_CPU_MONDO_QMASK    0xe8
 109 #define TRAP_PER_CPU_DEV_MONDO_QMASK    0xec
 110 #define TRAP_PER_CPU_RESUM_QMASK        0xf0
 111 #define TRAP_PER_CPU_NONRESUM_QMASK     0xf4
 112 #define TRAP_PER_CPU_PER_CPU_BASE       0xf8
 113
 114 #define TRAP_BLOCK_SZ_SHIFT             8
 115
 116 #include <asm/scratchpad.h>
 117
 118 #define __GET_CPUID(REG)                                \
 119         /* Spitfire implementation (default). */        \
 120 661:    ldxa            [%g0] ASI_UPA_CONFIG, REG;      \
 121         srlx            REG, 17, REG;                   \
 122          and            REG, 0x1f, REG;                 \
 123         nop;                                            \
 124         .section        .cpuid_patch, "ax";             \
 125         /* Instruction location. */                     \
 126         .word           661b;                           \
 127         /* Cheetah Safari implementation. */            \
 128         ldxa            [%g0] ASI_SAFARI_CONFIG, REG;   \
 129         srlx            REG, 17, REG;                   \
 130         and             REG, 0x3ff, REG;                \
 131         nop;                                            \
 132         /* Cheetah JBUS implementation. */              \
 133         ldxa            [%g0] ASI_JBUS_CONFIG, REG;     \
 134         srlx            REG, 17, REG;                   \
 135         and             REG, 0x1f, REG;                 \
 136         nop;                                            \
 137         /* Starfire implementation. */                  \
 138         sethi           %hi(0x1fff40000d0 >> 9), REG;   \
 139         sllx            REG, 9, REG;                    \
 140         or              REG, 0xd0, REG;                 \
 141         lduwa           [REG] ASI_PHYS_BYPASS_EC_E, REG;\
 142         /* sun4v implementation. */                     \
 143         mov             SCRATCHPAD_CPUID, REG;          \
 144         ldxa            [REG] ASI_SCRATCHPAD, REG;      \
 145         nop;                                            \
 146         nop;                                            \
 147         .previous;
 148
 149 #ifdef CONFIG_SMP
 150
 151 #define TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 152         __GET_CPUID(TMP)                        \
 153         sethi   %hi(trap_block), DEST;          \
 154         sllx    TMP, TRAP_BLOCK_SZ_SHIFT, TMP;  \
 155         or      DEST, %lo(trap_block), DEST;    \
 156         add     DEST, TMP, DEST;                \
 157
 158 /* Clobbers TMP, current address space PGD phys address into DEST.  */
 159 #define TRAP_LOAD_PGD_PHYS(DEST, TMP)           \
 160         TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 161         ldx     [DEST + TRAP_PER_CPU_PGD_PADDR], DEST;
 162
 163 /* Clobbers TMP, loads local processor's IRQ work area into DEST.  */
 164 #define TRAP_LOAD_IRQ_WORK_PA(DEST, TMP)        \
 165         TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 166         add     DEST, TRAP_PER_CPU_IRQ_WORKLIST_PA, DEST;
 167
 168 /* Clobbers TMP, loads DEST with current thread info pointer.  */
 169 #define TRAP_LOAD_THREAD_REG(DEST, TMP)         \
 170         TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 171         ldx     [DEST + TRAP_PER_CPU_THREAD], DEST;
 172
 173 /* Given the current thread info pointer in THR, load the per-cpu
 174  * area base of the current processor into DEST.  REG1, REG2, and REG3 are
 175  * clobbered.
 176  *
 177  * You absolutely cannot use DEST as a temporary in this code.  The
 178  * reason is that traps can happen during execution, and return from
 179  * trap will load the fully resolved DEST per-cpu base.  This can corrupt
 180  * the calculations done by the macro mid-stream.
 181  */
 182 #define LOAD_PER_CPU_BASE(DEST, THR, REG1, REG2, REG3)  \
 183         lduh    [THR + TI_CPU], REG1;                   \
 184         sethi   %hi(trap_block), REG2;                  \
 185         sllx    REG1, TRAP_BLOCK_SZ_SHIFT, REG1;        \
 186         or      REG2, %lo(trap_block), REG2;            \
 187         add     REG2, REG1, REG2;                       \
 188         ldx     [REG2 + TRAP_PER_CPU_PER_CPU_BASE], DEST;
 189
 190 #else
 191
 192 #define TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 193         sethi   %hi(trap_block), DEST;          \
 194         or      DEST, %lo(trap_block), DEST;    \
 195
 196 /* Uniprocessor versions, we know the cpuid is zero.  */
 197 #define TRAP_LOAD_PGD_PHYS(DEST, TMP)           \
 198         TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 199         ldx     [DEST + TRAP_PER_CPU_PGD_PADDR], DEST;
 200
 201 /* Clobbers TMP, loads local processor's IRQ work area into DEST.  */
 202 #define TRAP_LOAD_IRQ_WORK_PA(DEST, TMP)        \
 203         TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 204         add     DEST, TRAP_PER_CPU_IRQ_WORKLIST_PA, DEST;
 205
 206 #define TRAP_LOAD_THREAD_REG(DEST, TMP)         \
 207         TRAP_LOAD_TRAP_BLOCK(DEST, TMP)         \
 208         ldx     [DEST + TRAP_PER_CPU_THREAD], DEST;
 209
 210 /* No per-cpu areas on uniprocessor, so no need to load DEST.  */
 211 #define LOAD_PER_CPU_BASE(DEST, THR, REG1, REG2, REG3)
 212
 213 #endif /* !(CONFIG_SMP) */
 214
 215 #endif /* _SPARC_TRAP_BLOCK_H */