LXR linux/arch/powerpc/include/asm/kvm

   1/*
   2 * This program is free software; you can redistribute it and/or modify
   3 * it under the terms of the GNU General Public License, version 2, as
   4 * published by the Free Software Foundation.
   5 *
   6 * This program is distributed in the hope that it will be useful,
   7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9 * GNU General Public License for more details.
  10 *
  11 * You should have received a copy of the GNU General Public License
  12 * along with this program; if not, write to the Free Software
  13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  14 *
  15 * Copyright IBM Corp. 2007
  16 *
  17 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  18 */
  19
  20#ifndef __POWERPC_KVM_HOST_H__
  21#define __POWERPC_KVM_HOST_H__
  22
  23#include <linux/mutex.h>
  24#include <linux/hrtimer.h>
  25#include <linux/interrupt.h>
  26#include <linux/types.h>
  27#include <linux/kvm_types.h>
  28#include <linux/threads.h>
  29#include <linux/spinlock.h>
  30#include <linux/kvm_para.h>
  31#include <linux/list.h>
  32#include <linux/atomic.h>
  33#include <asm/kvm_asm.h>
  34#include <asm/processor.h>
  35#include <asm/page.h>
  36#include <asm/cacheflush.h>
  37
  38#define KVM_MAX_VCPUS           NR_CPUS
  39#define KVM_MAX_VCORES          NR_CPUS
  40#define KVM_USER_MEM_SLOTS 32
  41#define KVM_MEM_SLOTS_NUM KVM_USER_MEM_SLOTS
  42
  43#ifdef CONFIG_KVM_MMIO
  44#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
  45#endif
  46
  47/* These values are internal and can be increased later */
  48#define KVM_NR_IRQCHIPS          1
  49#define KVM_IRQCHIP_NUM_PINS     256
  50
  51#if !defined(CONFIG_KVM_440)
  52#include <linux/mmu_notifier.h>
  53
  54#define KVM_ARCH_WANT_MMU_NOTIFIER
  55
  56struct kvm;
  57extern int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
  58extern int kvm_unmap_hva_range(struct kvm *kvm,
  59                               unsigned long start, unsigned long end);
  60extern int kvm_age_hva(struct kvm *kvm, unsigned long hva);
  61extern int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
  62extern void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
  63
  64#endif
  65
  66/* We don't currently support large pages. */
  67#define KVM_HPAGE_GFN_SHIFT(x)  0
  68#define KVM_NR_PAGE_SIZES       1
  69#define KVM_PAGES_PER_HPAGE(x)  (1UL<<31)
  70
  71#define HPTEG_CACHE_NUM                 (1 << 15)
  72#define HPTEG_HASH_BITS_PTE             13
  73#define HPTEG_HASH_BITS_PTE_LONG        12
  74#define HPTEG_HASH_BITS_VPTE            13
  75#define HPTEG_HASH_BITS_VPTE_LONG       5
  76#define HPTEG_HASH_NUM_PTE              (1 << HPTEG_HASH_BITS_PTE)
  77#define HPTEG_HASH_NUM_PTE_LONG         (1 << HPTEG_HASH_BITS_PTE_LONG)
  78#define HPTEG_HASH_NUM_VPTE             (1 << HPTEG_HASH_BITS_VPTE)
  79#define HPTEG_HASH_NUM_VPTE_LONG        (1 << HPTEG_HASH_BITS_VPTE_LONG)
  80
  81/* Physical Address Mask - allowed range of real mode RAM access */
  82#define KVM_PAM                 0x0fffffffffffffffULL
  83
  84struct kvm;
  85struct kvm_run;
  86struct kvm_vcpu;
  87
  88struct lppaca;
  89struct slb_shadow;
  90struct dtl_entry;
  91
  92struct kvm_vm_stat {
  93        u32 remote_tlb_flush;
  94};
  95
  96struct kvm_vcpu_stat {
  97        u32 sum_exits;
  98        u32 mmio_exits;
  99        u32 dcr_exits;
 100        u32 signal_exits;
 101        u32 light_exits;
 102        /* Account for special types of light exits: */
 103        u32 itlb_real_miss_exits;
 104        u32 itlb_virt_miss_exits;
 105        u32 dtlb_real_miss_exits;
 106        u32 dtlb_virt_miss_exits;
 107        u32 syscall_exits;
 108        u32 isi_exits;
 109        u32 dsi_exits;
 110        u32 emulated_inst_exits;
 111        u32 dec_exits;
 112        u32 ext_intr_exits;
 113        u32 halt_wakeup;
 114        u32 dbell_exits;
 115        u32 gdbell_exits;
 116#ifdef CONFIG_PPC_BOOK3S
 117        u32 pf_storage;
 118        u32 pf_instruc;
 119        u32 sp_storage;
 120        u32 sp_instruc;
 121        u32 queue_intr;
 122        u32 ld;
 123        u32 ld_slow;
 124        u32 st;
 125        u32 st_slow;
 126#endif
 127};
 128
 129enum kvm_exit_types {
 130        MMIO_EXITS,
 131        DCR_EXITS,
 132        SIGNAL_EXITS,
 133        ITLB_REAL_MISS_EXITS,
 134        ITLB_VIRT_MISS_EXITS,
 135        DTLB_REAL_MISS_EXITS,
 136        DTLB_VIRT_MISS_EXITS,
 137        SYSCALL_EXITS,
 138        ISI_EXITS,
 139        DSI_EXITS,
 140        EMULATED_INST_EXITS,
 141        EMULATED_MTMSRWE_EXITS,
 142        EMULATED_WRTEE_EXITS,
 143        EMULATED_MTSPR_EXITS,
 144        EMULATED_MFSPR_EXITS,
 145        EMULATED_MTMSR_EXITS,
 146        EMULATED_MFMSR_EXITS,
 147        EMULATED_TLBSX_EXITS,
 148        EMULATED_TLBWE_EXITS,
 149        EMULATED_RFI_EXITS,
 150        EMULATED_RFCI_EXITS,
 151        DEC_EXITS,
 152        EXT_INTR_EXITS,
 153        HALT_WAKEUP,
 154        USR_PR_INST,
 155        FP_UNAVAIL,
 156        DEBUG_EXITS,
 157        TIMEINGUEST,
 158        DBELL_EXITS,
 159        GDBELL_EXITS,
 160        __NUMBER_OF_KVM_EXIT_TYPES
 161};
 162
 163/* allow access to big endian 32bit upper/lower parts and 64bit var */
 164struct kvmppc_exit_timing {
 165        union {
 166                u64 tv64;
 167                struct {
 168                        u32 tbu, tbl;
 169                } tv32;
 170        };
 171};
 172
 173struct kvmppc_pginfo {
 174        unsigned long pfn;
 175        atomic_t refcnt;
 176};
 177
 178struct kvmppc_spapr_tce_table {
 179        struct list_head list;
 180        struct kvm *kvm;
 181        u64 liobn;
 182        u32 window_size;
 183        struct page *pages[0];
 184};
 185
 186struct kvm_rma_info {
 187        atomic_t use_count;
 188        unsigned long base_pfn;
 189};
 190
 191/* XICS components, defined in book3s_xics.c */
 192struct kvmppc_xics;
 193struct kvmppc_icp;
 194
 195/*
 196 * The reverse mapping array has one entry for each HPTE,
 197 * which stores the guest's view of the second word of the HPTE
 198 * (including the guest physical address of the mapping),
 199 * plus forward and backward pointers in a doubly-linked ring
 200 * of HPTEs that map the same host page.  The pointers in this
 201 * ring are 32-bit HPTE indexes, to save space.
 202 */
 203struct revmap_entry {
 204        unsigned long guest_rpte;
 205        unsigned int forw, back;
 206};
 207
 208/*
 209 * We use the top bit of each memslot->arch.rmap entry as a lock bit,
 210 * and bit 32 as a present flag.  The bottom 32 bits are the
 211 * index in the guest HPT of a HPTE that points to the page.
 212 */
 213#define KVMPPC_RMAP_LOCK_BIT    63
 214#define KVMPPC_RMAP_RC_SHIFT    32
 215#define KVMPPC_RMAP_REFERENCED  (HPTE_R_R << KVMPPC_RMAP_RC_SHIFT)
 216#define KVMPPC_RMAP_CHANGED     (HPTE_R_C << KVMPPC_RMAP_RC_SHIFT)
 217#define KVMPPC_RMAP_PRESENT     0x100000000ul
 218#define KVMPPC_RMAP_INDEX       0xfffffffful
 219
 220/* Low-order bits in memslot->arch.slot_phys[] */
 221#define KVMPPC_PAGE_ORDER_MASK  0x1f
 222#define KVMPPC_PAGE_NO_CACHE    HPTE_R_I        /* 0x20 */
 223#define KVMPPC_PAGE_WRITETHRU   HPTE_R_W        /* 0x40 */
 224#define KVMPPC_GOT_PAGE         0x80
 225
 226struct kvm_arch_memory_slot {
 227#ifdef CONFIG_KVM_BOOK3S_64_HV
 228        unsigned long *rmap;
 229        unsigned long *slot_phys;
 230#endif /* CONFIG_KVM_BOOK3S_64_HV */
 231};
 232
 233struct kvm_arch {
 234        unsigned int lpid;
 235#ifdef CONFIG_KVM_BOOK3S_64_HV
 236        unsigned long hpt_virt;
 237        struct revmap_entry *revmap;
 238        unsigned int host_lpid;
 239        unsigned long host_lpcr;
 240        unsigned long sdr1;
 241        unsigned long host_sdr1;
 242        int tlbie_lock;
 243        unsigned long lpcr;
 244        unsigned long rmor;
 245        struct kvm_rma_info *rma;
 246        unsigned long vrma_slb_v;
 247        int rma_setup_done;
 248        int using_mmu_notifiers;
 249        u32 hpt_order;
 250        atomic_t vcpus_running;
 251        u32 online_vcores;
 252        unsigned long hpt_npte;
 253        unsigned long hpt_mask;
 254        atomic_t hpte_mod_interest;
 255        spinlock_t slot_phys_lock;
 256        cpumask_t need_tlb_flush;
 257        struct kvmppc_vcore *vcores[KVM_MAX_VCORES];
 258        int hpt_cma_alloc;
 259#endif /* CONFIG_KVM_BOOK3S_64_HV */
 260#ifdef CONFIG_PPC_BOOK3S_64
 261        struct list_head spapr_tce_tables;
 262        struct list_head rtas_tokens;
 263#endif
 264#ifdef CONFIG_KVM_MPIC
 265        struct openpic *mpic;
 266#endif
 267#ifdef CONFIG_KVM_XICS
 268        struct kvmppc_xics *xics;
 269#endif
 270};
 271
 272/*
 273 * Struct for a virtual core.
 274 * Note: entry_exit_count combines an entry count in the bottom 8 bits
 275 * and an exit count in the next 8 bits.  This is so that we can
 276 * atomically increment the entry count iff the exit count is 0
 277 * without taking the lock.
 278 */
 279struct kvmppc_vcore {
 280        int n_runnable;
 281        int n_busy;
 282        int num_threads;
 283        int entry_exit_count;
 284        int n_woken;
 285        int nap_count;
 286        int napping_threads;
 287        u16 pcpu;
 288        u16 last_cpu;
 289        u8 vcore_state;
 290        u8 in_guest;
 291        struct list_head runnable_threads;
 292        spinlock_t lock;
 293        wait_queue_head_t wq;
 294        u64 stolen_tb;
 295        u64 preempt_tb;
 296        struct kvm_vcpu *runner;
 297};
 298
 299#define VCORE_ENTRY_COUNT(vc)   ((vc)->entry_exit_count & 0xff)
 300#define VCORE_EXIT_COUNT(vc)    ((vc)->entry_exit_count >> 8)
 301
 302/* Values for vcore_state */
 303#define VCORE_INACTIVE  0
 304#define VCORE_SLEEPING  1
 305#define VCORE_STARTING  2
 306#define VCORE_RUNNING   3
 307#define VCORE_EXITING   4
 308
 309/*
 310 * Struct used to manage memory for a virtual processor area
 311 * registered by a PAPR guest.  There are three types of area
 312 * that a guest can register.
 313 */
 314struct kvmppc_vpa {
 315        unsigned long gpa;      /* Current guest phys addr */
 316        void *pinned_addr;      /* Address in kernel linear mapping */
 317        void *pinned_end;       /* End of region */
 318        unsigned long next_gpa; /* Guest phys addr for update */
 319        unsigned long len;      /* Number of bytes required */
 320        u8 update_pending;      /* 1 => update pinned_addr from next_gpa */
 321        bool dirty;             /* true => area has been modified by kernel */
 322};
 323
 324struct kvmppc_pte {
 325        ulong eaddr;
 326        u64 vpage;
 327        ulong raddr;
 328        bool may_read           : 1;
 329        bool may_write          : 1;
 330        bool may_execute        : 1;
 331};
 332
 333struct kvmppc_mmu {
 334        /* book3s_64 only */
 335        void (*slbmte)(struct kvm_vcpu *vcpu, u64 rb, u64 rs);
 336        u64  (*slbmfee)(struct kvm_vcpu *vcpu, u64 slb_nr);
 337        u64  (*slbmfev)(struct kvm_vcpu *vcpu, u64 slb_nr);
 338        void (*slbie)(struct kvm_vcpu *vcpu, u64 slb_nr);
 339        void (*slbia)(struct kvm_vcpu *vcpu);
 340        /* book3s */
 341        void (*mtsrin)(struct kvm_vcpu *vcpu, u32 srnum, ulong value);
 342        u32  (*mfsrin)(struct kvm_vcpu *vcpu, u32 srnum);
 343        int  (*xlate)(struct kvm_vcpu *vcpu, gva_t eaddr, struct kvmppc_pte *pte, bool data);
 344        void (*reset_msr)(struct kvm_vcpu *vcpu);
 345        void (*tlbie)(struct kvm_vcpu *vcpu, ulong addr, bool large);
 346        int  (*esid_to_vsid)(struct kvm_vcpu *vcpu, ulong esid, u64 *vsid);
 347        u64  (*ea_to_vp)(struct kvm_vcpu *vcpu, gva_t eaddr, bool data);
 348        bool (*is_dcbz32)(struct kvm_vcpu *vcpu);
 349};
 350
 351struct kvmppc_slb {
 352        u64 esid;
 353        u64 vsid;
 354        u64 orige;
 355        u64 origv;
 356        bool valid      : 1;
 357        bool Ks         : 1;
 358        bool Kp         : 1;
 359        bool nx         : 1;
 360        bool large      : 1;    /* PTEs are 16MB */
 361        bool tb         : 1;    /* 1TB segment */
 362        bool class      : 1;
 363};
 364
 365# ifdef CONFIG_PPC_FSL_BOOK3E
 366#define KVMPPC_BOOKE_IAC_NUM    2
 367#define KVMPPC_BOOKE_DAC_NUM    2
 368# else
 369#define KVMPPC_BOOKE_IAC_NUM    4
 370#define KVMPPC_BOOKE_DAC_NUM    2
 371# endif
 372#define KVMPPC_BOOKE_MAX_IAC    4
 373#define KVMPPC_BOOKE_MAX_DAC    2
 374
 375/* KVMPPC_EPR_USER takes precedence over KVMPPC_EPR_KERNEL */
 376#define KVMPPC_EPR_NONE         0 /* EPR not supported */
 377#define KVMPPC_EPR_USER         1 /* exit to userspace to fill EPR */
 378#define KVMPPC_EPR_KERNEL       2 /* in-kernel irqchip */
 379
 380struct kvmppc_booke_debug_reg {
 381        u32 dbcr0;
 382        u32 dbcr1;
 383        u32 dbcr2;
 384#ifdef CONFIG_KVM_E500MC
 385        u32 dbcr4;
 386#endif
 387        u64 iac[KVMPPC_BOOKE_MAX_IAC];
 388        u64 dac[KVMPPC_BOOKE_MAX_DAC];
 389};
 390
 391#define KVMPPC_IRQ_DEFAULT      0
 392#define KVMPPC_IRQ_MPIC         1
 393#define KVMPPC_IRQ_XICS         2
 394
 395struct openpic;
 396
 397struct kvm_vcpu_arch {
 398        ulong host_stack;
 399        u32 host_pid;
 400#ifdef CONFIG_PPC_BOOK3S
 401        struct kvmppc_slb slb[64];
 402        int slb_max;            /* 1 + index of last valid entry in slb[] */
 403        int slb_nr;             /* total number of entries in SLB */
 404        struct kvmppc_mmu mmu;
 405#endif
 406
 407        ulong gpr[32];
 408
 409        u64 fpr[32];
 410        u64 fpscr;
 411
 412#ifdef CONFIG_SPE
 413        ulong evr[32];
 414        ulong spefscr;
 415        ulong host_spefscr;
 416        u64 acc;
 417#endif
 418#ifdef CONFIG_ALTIVEC
 419        vector128 vr[32];
 420        vector128 vscr;
 421#endif
 422
 423#ifdef CONFIG_VSX
 424        u64 vsr[64];
 425#endif
 426
 427#ifdef CONFIG_KVM_BOOKE_HV
 428        u32 host_mas4;
 429        u32 host_mas6;
 430        u32 shadow_epcr;
 431        u32 shadow_msrp;
 432        u32 eplc;
 433        u32 epsc;
 434        u32 oldpir;
 435#endif
 436
 437#if defined(CONFIG_BOOKE)
 438#if defined(CONFIG_KVM_BOOKE_HV) || defined(CONFIG_64BIT)
 439        u32 epcr;
 440#endif
 441#endif
 442
 443#ifdef CONFIG_PPC_BOOK3S
 444        /* For Gekko paired singles */
 445        u32 qpr[32];
 446#endif
 447
 448        ulong pc;
 449        ulong ctr;
 450        ulong lr;
 451
 452        ulong xer;
 453        u32 cr;
 454
 455#ifdef CONFIG_PPC_BOOK3S
 456        ulong hflags;
 457        ulong guest_owned_ext;
 458        ulong purr;
 459        ulong spurr;
 460        ulong dscr;
 461        ulong amr;
 462        ulong uamor;
 463        u32 ctrl;
 464        ulong dabr;
 465        ulong cfar;
 466#endif
 467        u32 vrsave; /* also USPRG0 */
 468        u32 mmucr;
 469        /* shadow_msr is unused for BookE HV */
 470        ulong shadow_msr;
 471        ulong csrr0;
 472        ulong csrr1;
 473        ulong dsrr0;
 474        ulong dsrr1;
 475        ulong mcsrr0;
 476        ulong mcsrr1;
 477        ulong mcsr;
 478        u32 dec;
 479#ifdef CONFIG_BOOKE
 480        u32 decar;
 481#endif
 482        u32 tbl;
 483        u32 tbu;
 484        u32 tcr;
 485        ulong tsr; /* we need to perform set/clr_bits() which requires ulong */
 486        u32 ivor[64];
 487        ulong ivpr;
 488        u32 pvr;
 489
 490        u32 shadow_pid;
 491        u32 shadow_pid1;
 492        u32 pid;
 493        u32 swap_pid;
 494
 495        u32 ccr0;
 496        u32 ccr1;
 497        u32 dbsr;
 498
 499        u64 mmcr[3];
 500        u32 pmc[8];
 501
 502#ifdef CONFIG_KVM_EXIT_TIMING
 503        struct mutex exit_timing_lock;
 504        struct kvmppc_exit_timing timing_exit;
 505        struct kvmppc_exit_timing timing_last_enter;
 506        u32 last_exit_type;
 507        u32 timing_count_type[__NUMBER_OF_KVM_EXIT_TYPES];
 508        u64 timing_sum_duration[__NUMBER_OF_KVM_EXIT_TYPES];
 509        u64 timing_sum_quad_duration[__NUMBER_OF_KVM_EXIT_TYPES];
 510        u64 timing_min_duration[__NUMBER_OF_KVM_EXIT_TYPES];
 511        u64 timing_max_duration[__NUMBER_OF_KVM_EXIT_TYPES];
 512        u64 timing_last_exit;
 513        struct dentry *debugfs_exit_timing;
 514#endif
 515
 516#ifdef CONFIG_PPC_BOOK3S
 517        ulong fault_dar;
 518        u32 fault_dsisr;
 519#endif
 520
 521#ifdef CONFIG_BOOKE
 522        ulong fault_dear;
 523        ulong fault_esr;
 524        ulong queued_dear;
 525        ulong queued_esr;
 526        spinlock_t wdt_lock;
 527        struct timer_list wdt_timer;
 528        u32 tlbcfg[4];
 529        u32 tlbps[4];
 530        u32 mmucfg;
 531        u32 eptcfg;
 532        u32 epr;
 533        u32 crit_save;
 534        struct kvmppc_booke_debug_reg dbg_reg;
 535#endif
 536        gpa_t paddr_accessed;
 537        gva_t vaddr_accessed;
 538
 539        u8 io_gpr; /* GPR used as IO source/target */
 540        u8 mmio_is_bigendian;
 541        u8 mmio_sign_extend;
 542        u8 dcr_needed;
 543        u8 dcr_is_write;
 544        u8 osi_needed;
 545        u8 osi_enabled;
 546        u8 papr_enabled;
 547        u8 watchdog_enabled;
 548        u8 sane;
 549        u8 cpu_type;
 550        u8 hcall_needed;
 551        u8 epr_flags; /* KVMPPC_EPR_xxx */
 552        u8 epr_needed;
 553
 554        u32 cpr0_cfgaddr; /* holds the last set cpr0_cfgaddr */
 555
 556        struct hrtimer dec_timer;
 557        struct tasklet_struct tasklet;
 558        u64 dec_jiffies;
 559        u64 dec_expires;
 560        unsigned long pending_exceptions;
 561        u8 ceded;
 562        u8 prodded;
 563        u32 last_inst;
 564
 565        wait_queue_head_t *wqp;
 566        struct kvmppc_vcore *vcore;
 567        int ret;
 568        int trap;
 569        int state;
 570        int ptid;
 571        bool timer_running;
 572        wait_queue_head_t cpu_run;
 573
 574        struct kvm_vcpu_arch_shared *shared;
 575        unsigned long magic_page_pa; /* phys addr to map the magic page to */
 576        unsigned long magic_page_ea; /* effect. addr to map the magic page to */
 577
 578        int irq_type;           /* one of KVM_IRQ_* */
 579        int irq_cpu_id;
 580        struct openpic *mpic;   /* KVM_IRQ_MPIC */
 581#ifdef CONFIG_KVM_XICS
 582        struct kvmppc_icp *icp; /* XICS presentation controller */
 583#endif
 584
 585#ifdef CONFIG_KVM_BOOK3S_64_HV
 586        struct kvm_vcpu_arch_shared shregs;
 587
 588        unsigned long pgfault_addr;
 589        long pgfault_index;
 590        unsigned long pgfault_hpte[2];
 591
 592        struct list_head run_list;
 593        struct task_struct *run_task;
 594        struct kvm_run *kvm_run;
 595        pgd_t *pgdir;
 596
 597        spinlock_t vpa_update_lock;
 598        struct kvmppc_vpa vpa;
 599        struct kvmppc_vpa dtl;
 600        struct dtl_entry *dtl_ptr;
 601        unsigned long dtl_index;
 602        u64 stolen_logged;
 603        struct kvmppc_vpa slb_shadow;
 604
 605        spinlock_t tbacct_lock;
 606        u64 busy_stolen;
 607        u64 busy_preempt;
 608#endif
 609};
 610
 611/* Values for vcpu->arch.state */
 612#define KVMPPC_VCPU_NOTREADY            0
 613#define KVMPPC_VCPU_RUNNABLE            1
 614#define KVMPPC_VCPU_BUSY_IN_HOST        2
 615
 616/* Values for vcpu->arch.io_gpr */
 617#define KVM_MMIO_REG_MASK       0x001f
 618#define KVM_MMIO_REG_EXT_MASK   0xffe0
 619#define KVM_MMIO_REG_GPR        0x0000
 620#define KVM_MMIO_REG_FPR        0x0020
 621#define KVM_MMIO_REG_QPR        0x0040
 622#define KVM_MMIO_REG_FQPR       0x0060
 623
 624#define __KVM_HAVE_ARCH_WQP
 625#define __KVM_HAVE_CREATE_DEVICE
 626
 627#endif /* __POWERPC_KVM_HOST_H__ */
 628