FreeBSD/Linux Kernel Cross Reference
sys/x86/iommu/intel_dmar.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2013-2015 The FreeBSD Foundation
      * All rights reserved.
      *
      * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
      * under sponsorship from the FreeBSD Foundation.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef __X86_IOMMU_INTEL_DMAR_H
    #define __X86_IOMMU_INTEL_DMAR_H
    
    /* Host or physical memory address, after translation. */
    typedef uint64_t dmar_haddr_t;
    /* Guest or bus address, before translation. */
    typedef uint64_t dmar_gaddr_t;
    
    struct dmar_qi_genseq {
            u_int gen;
            uint32_t seq;
    };
    
    struct dmar_map_entry {
            dmar_gaddr_t start;
            dmar_gaddr_t end;
            dmar_gaddr_t free_after;        /* Free space after the entry */
            dmar_gaddr_t free_down;         /* Max free space below the
                                               current R/B tree node */
            u_int flags;
            TAILQ_ENTRY(dmar_map_entry) dmamap_link; /* Link for dmamap entries */
            RB_ENTRY(dmar_map_entry) rb_entry;       /* Links for domain entries */
            TAILQ_ENTRY(dmar_map_entry) unroll_link; /* Link for unroll after
                                                        dmamap_load failure */
            struct dmar_domain *domain;
            struct dmar_qi_genseq gseq;
    };
    
    RB_HEAD(dmar_gas_entries_tree, dmar_map_entry);
    RB_PROTOTYPE(dmar_gas_entries_tree, dmar_map_entry, rb_entry,
        dmar_gas_cmp_entries);
    
    #define DMAR_MAP_ENTRY_PLACE    0x0001  /* Fake entry */
    #define DMAR_MAP_ENTRY_RMRR     0x0002  /* Permanent, not linked by
                                               dmamap_link */
    #define DMAR_MAP_ENTRY_MAP      0x0004  /* Busdma created, linked by
                                               dmamap_link */
    #define DMAR_MAP_ENTRY_UNMAPPED 0x0010  /* No backing pages */
    #define DMAR_MAP_ENTRY_QI_NF    0x0020  /* qi task, do not free entry */
    #define DMAR_MAP_ENTRY_READ     0x1000  /* Read permitted */
    #define DMAR_MAP_ENTRY_WRITE    0x2000  /* Write permitted */
    #define DMAR_MAP_ENTRY_SNOOP    0x4000  /* Snoop */
    #define DMAR_MAP_ENTRY_TM       0x8000  /* Transient */
    
    /*
     * Locking annotations:
     * (u) - Protected by dmar unit lock
     * (d) - Protected by domain lock
     * (c) - Immutable after initialization
     */
    
    /*
     * The domain abstraction.  Most non-constant members of the domain
     * are protected by owning dmar unit lock, not by the domain lock.
     * Most important, the dmar lock protects the contexts list.
     *
     * The domain lock protects the address map for the domain, and list
     * of unload entries delayed.
     *
     * Page tables pages and pages content is protected by the vm object
     * lock pgtbl_obj, which contains the page tables pages.
     */
    struct dmar_domain {
            int domain;                     /* (c) DID, written in context entry */
            int mgaw;                       /* (c) Real max address width */
            int agaw;                       /* (c) Adjusted guest address width */
           int pglvl;                      /* (c) The pagelevel */
           int awlvl;                      /* (c) The pagelevel as the bitmask,
                                              to set in context entry */
           dmar_gaddr_t end;               /* (c) Highest address + 1 in
                                              the guest AS */
           u_int ctx_cnt;                  /* (u) Number of contexts owned */
           u_int refs;                     /* (u) Refs, including ctx */
           struct dmar_unit *dmar;         /* (c) */
           struct mtx lock;                /* (c) */
           LIST_ENTRY(dmar_domain) link;   /* (u) Member in the dmar list */
           LIST_HEAD(, dmar_ctx) contexts; /* (u) */
           vm_object_t pgtbl_obj;          /* (c) Page table pages */
           u_int flags;                    /* (u) */
           u_int entries_cnt;              /* (d) */
           struct dmar_gas_entries_tree rb_root; /* (d) */
           struct dmar_map_entries_tailq unload_entries; /* (d) Entries to
                                                            unload */
           struct dmar_map_entry *first_place, *last_place; /* (d) */
           struct task unload_task;        /* (c) */
           u_int batch_no;
   };
   
   struct dmar_ctx {
           struct bus_dma_tag_dmar ctx_tag; /* (c) Root tag */
           uint16_t rid;                   /* (c) pci RID */
           uint64_t last_fault_rec[2];     /* Last fault reported */
           struct dmar_domain *domain;     /* (c) */
           LIST_ENTRY(dmar_ctx) link;      /* (u) Member in the domain list */
           u_int refs;                     /* (u) References from tags */
           u_int flags;                    /* (u) */
           u_long loads;                   /* atomic updates, for stat only */
           u_long unloads;                 /* same */
   };
   
   #define DMAR_DOMAIN_GAS_INITED          0x0001
   #define DMAR_DOMAIN_PGTBL_INITED        0x0002
   #define DMAR_DOMAIN_IDMAP               0x0010  /* Domain uses identity
                                                      page table */
   #define DMAR_DOMAIN_RMRR                0x0020  /* Domain contains RMRR entry,
                                                      cannot be turned off */
   
   /* struct dmar_ctx flags */
   #define DMAR_CTX_FAULTED        0x0001  /* Fault was reported,
                                              last_fault_rec is valid */
   #define DMAR_CTX_DISABLED       0x0002  /* Device is disabled, the
                                              ephemeral reference is kept
                                              to prevent context destruction */
   
   #define DMAR_DOMAIN_PGLOCK(dom)         VM_OBJECT_WLOCK((dom)->pgtbl_obj)
   #define DMAR_DOMAIN_PGTRYLOCK(dom)      VM_OBJECT_TRYWLOCK((dom)->pgtbl_obj)
   #define DMAR_DOMAIN_PGUNLOCK(dom)       VM_OBJECT_WUNLOCK((dom)->pgtbl_obj)
   #define DMAR_DOMAIN_ASSERT_PGLOCKED(dom) \
           VM_OBJECT_ASSERT_WLOCKED((dom)->pgtbl_obj)
   
   #define DMAR_DOMAIN_LOCK(dom)   mtx_lock(&(dom)->lock)
   #define DMAR_DOMAIN_UNLOCK(dom) mtx_unlock(&(dom)->lock)
   #define DMAR_DOMAIN_ASSERT_LOCKED(dom) mtx_assert(&(dom)->lock, MA_OWNED)
   
   struct dmar_msi_data {
           int irq;
           int irq_rid;
           struct resource *irq_res;
           void *intr_handle;
           int (*handler)(void *);
           int msi_data_reg;
           int msi_addr_reg;
           int msi_uaddr_reg;
           void (*enable_intr)(struct dmar_unit *);
           void (*disable_intr)(struct dmar_unit *);
           const char *name;
   };
   
   #define DMAR_INTR_FAULT         0
   #define DMAR_INTR_QI            1
   #define DMAR_INTR_TOTAL         2
   
   struct dmar_unit {
           device_t dev;
           int unit;
           uint16_t segment;
           uint64_t base;
   
           /* Resources */
           int reg_rid;
           struct resource *regs;
   
           struct dmar_msi_data intrs[DMAR_INTR_TOTAL];
   
           /* Hardware registers cache */
           uint32_t hw_ver;
           uint64_t hw_cap;
           uint64_t hw_ecap;
           uint32_t hw_gcmd;
   
           /* Data for being a dmar */
           struct mtx lock;
           LIST_HEAD(, dmar_domain) domains;
           struct unrhdr *domids;
           vm_object_t ctx_obj;
           u_int barrier_flags;
   
           /* Fault handler data */
           struct mtx fault_lock;
           uint64_t *fault_log;
           int fault_log_head;
           int fault_log_tail;
           int fault_log_size;
           struct task fault_task;
           struct taskqueue *fault_taskqueue;
   
           /* QI */
           int qi_enabled;
           vm_offset_t inv_queue;
           vm_size_t inv_queue_size;
           uint32_t inv_queue_avail;
           uint32_t inv_queue_tail;
           volatile uint32_t inv_waitd_seq_hw; /* hw writes there on wait
                                                  descr completion */
           uint64_t inv_waitd_seq_hw_phys;
           uint32_t inv_waitd_seq; /* next sequence number to use for wait descr */
           u_int inv_waitd_gen;    /* seq number generation AKA seq overflows */
           u_int inv_seq_waiters;  /* count of waiters for seq */
           u_int inv_queue_full;   /* informational counter */
   
           /* IR */
           int ir_enabled;
           vm_paddr_t irt_phys;
           dmar_irte_t *irt;
           u_int irte_cnt;
           vmem_t *irtids;
   
           /* Delayed freeing of map entries queue processing */
           struct dmar_map_entries_tailq tlb_flush_entries;
           struct task qi_task;
           struct taskqueue *qi_taskqueue;
   
           /* Busdma delayed map load */
           struct task dmamap_load_task;
           TAILQ_HEAD(, bus_dmamap_dmar) delayed_maps;
           struct taskqueue *delayed_taskqueue;
   
           int dma_enabled;
   
           /*
            * Bitmap of buses for which context must ignore slot:func,
            * duplicating the page table pointer into all context table
            * entries.  This is a client-controlled quirk to support some
            * NTBs.
            */
           uint32_t buswide_ctxs[(PCI_BUSMAX + 1) / NBBY / sizeof(uint32_t)];
   
   };
   
   #define DMAR_LOCK(dmar)         mtx_lock(&(dmar)->lock)
   #define DMAR_UNLOCK(dmar)       mtx_unlock(&(dmar)->lock)
   #define DMAR_ASSERT_LOCKED(dmar) mtx_assert(&(dmar)->lock, MA_OWNED)
   
   #define DMAR_FAULT_LOCK(dmar)   mtx_lock_spin(&(dmar)->fault_lock)
   #define DMAR_FAULT_UNLOCK(dmar) mtx_unlock_spin(&(dmar)->fault_lock)
   #define DMAR_FAULT_ASSERT_LOCKED(dmar) mtx_assert(&(dmar)->fault_lock, MA_OWNED)
   
   #define DMAR_IS_COHERENT(dmar)  (((dmar)->hw_ecap & DMAR_ECAP_C) != 0)
   #define DMAR_HAS_QI(dmar)       (((dmar)->hw_ecap & DMAR_ECAP_QI) != 0)
   #define DMAR_X2APIC(dmar) \
           (x2apic_mode && ((dmar)->hw_ecap & DMAR_ECAP_EIM) != 0)
   
   /* Barrier ids */
   #define DMAR_BARRIER_RMRR       0
   #define DMAR_BARRIER_USEQ       1
   
   struct dmar_unit *dmar_find(device_t dev, bool verbose);
   struct dmar_unit *dmar_find_hpet(device_t dev, uint16_t *rid);
   struct dmar_unit *dmar_find_ioapic(u_int apic_id, uint16_t *rid);
   
   u_int dmar_nd2mask(u_int nd);
   bool dmar_pglvl_supported(struct dmar_unit *unit, int pglvl);
   int domain_set_agaw(struct dmar_domain *domain, int mgaw);
   int dmar_maxaddr2mgaw(struct dmar_unit *unit, dmar_gaddr_t maxaddr,
       bool allow_less);
   vm_pindex_t pglvl_max_pages(int pglvl);
   int domain_is_sp_lvl(struct dmar_domain *domain, int lvl);
   dmar_gaddr_t pglvl_page_size(int total_pglvl, int lvl);
   dmar_gaddr_t domain_page_size(struct dmar_domain *domain, int lvl);
   int calc_am(struct dmar_unit *unit, dmar_gaddr_t base, dmar_gaddr_t size,
       dmar_gaddr_t *isizep);
   struct vm_page *dmar_pgalloc(vm_object_t obj, vm_pindex_t idx, int flags);
   void dmar_pgfree(vm_object_t obj, vm_pindex_t idx, int flags);
   void *dmar_map_pgtbl(vm_object_t obj, vm_pindex_t idx, int flags,
       struct sf_buf **sf);
   void dmar_unmap_pgtbl(struct sf_buf *sf);
   int dmar_load_root_entry_ptr(struct dmar_unit *unit);
   int dmar_inv_ctx_glob(struct dmar_unit *unit);
   int dmar_inv_iotlb_glob(struct dmar_unit *unit);
   int dmar_flush_write_bufs(struct dmar_unit *unit);
   void dmar_flush_pte_to_ram(struct dmar_unit *unit, dmar_pte_t *dst);
   void dmar_flush_ctx_to_ram(struct dmar_unit *unit, dmar_ctx_entry_t *dst);
   void dmar_flush_root_to_ram(struct dmar_unit *unit, dmar_root_entry_t *dst);
   int dmar_enable_translation(struct dmar_unit *unit);
   int dmar_disable_translation(struct dmar_unit *unit);
   int dmar_load_irt_ptr(struct dmar_unit *unit);
   int dmar_enable_ir(struct dmar_unit *unit);
   int dmar_disable_ir(struct dmar_unit *unit);
   bool dmar_barrier_enter(struct dmar_unit *dmar, u_int barrier_id);
   void dmar_barrier_exit(struct dmar_unit *dmar, u_int barrier_id);
   uint64_t dmar_get_timeout(void);
   void dmar_update_timeout(uint64_t newval);
   
   int dmar_fault_intr(void *arg);
   void dmar_enable_fault_intr(struct dmar_unit *unit);
   void dmar_disable_fault_intr(struct dmar_unit *unit);
   int dmar_init_fault_log(struct dmar_unit *unit);
   void dmar_fini_fault_log(struct dmar_unit *unit);
   
   int dmar_qi_intr(void *arg);
   void dmar_enable_qi_intr(struct dmar_unit *unit);
   void dmar_disable_qi_intr(struct dmar_unit *unit);
   int dmar_init_qi(struct dmar_unit *unit);
   void dmar_fini_qi(struct dmar_unit *unit);
   void dmar_qi_invalidate_locked(struct dmar_domain *domain, dmar_gaddr_t start,
       dmar_gaddr_t size, struct dmar_qi_genseq *psec, bool emit_wait);
   void dmar_qi_invalidate_ctx_glob_locked(struct dmar_unit *unit);
   void dmar_qi_invalidate_iotlb_glob_locked(struct dmar_unit *unit);
   void dmar_qi_invalidate_iec_glob(struct dmar_unit *unit);
   void dmar_qi_invalidate_iec(struct dmar_unit *unit, u_int start, u_int cnt);
   
   vm_object_t domain_get_idmap_pgtbl(struct dmar_domain *domain,
       dmar_gaddr_t maxaddr);
   void put_idmap_pgtbl(vm_object_t obj);
   int domain_map_buf(struct dmar_domain *domain, dmar_gaddr_t base,
       dmar_gaddr_t size, vm_page_t *ma, uint64_t pflags, int flags);
   int domain_unmap_buf(struct dmar_domain *domain, dmar_gaddr_t base,
       dmar_gaddr_t size, int flags);
   void domain_flush_iotlb_sync(struct dmar_domain *domain, dmar_gaddr_t base,
       dmar_gaddr_t size);
   int domain_alloc_pgtbl(struct dmar_domain *domain);
   void domain_free_pgtbl(struct dmar_domain *domain);
   
   int dmar_dev_depth(device_t child);
   void dmar_dev_path(device_t child, int *busno, void *path1, int depth);
   
   struct dmar_ctx *dmar_instantiate_ctx(struct dmar_unit *dmar, device_t dev,
       bool rmrr);
   struct dmar_ctx *dmar_get_ctx_for_dev(struct dmar_unit *dmar, device_t dev,
       uint16_t rid, bool id_mapped, bool rmrr_init);
   struct dmar_ctx *dmar_get_ctx_for_devpath(struct dmar_unit *dmar, uint16_t rid,
       int dev_domain, int dev_busno, const void *dev_path, int dev_path_len,
       bool id_mapped, bool rmrr_init);
   int dmar_move_ctx_to_domain(struct dmar_domain *domain, struct dmar_ctx *ctx);
   void dmar_free_ctx_locked(struct dmar_unit *dmar, struct dmar_ctx *ctx);
   void dmar_free_ctx(struct dmar_ctx *ctx);
   struct dmar_ctx *dmar_find_ctx_locked(struct dmar_unit *dmar, uint16_t rid);
   void dmar_domain_unload_entry(struct dmar_map_entry *entry, bool free);
   void dmar_domain_unload(struct dmar_domain *domain,
       struct dmar_map_entries_tailq *entries, bool cansleep);
   void dmar_domain_free_entry(struct dmar_map_entry *entry, bool free);
   
   int dmar_init_busdma(struct dmar_unit *unit);
   void dmar_fini_busdma(struct dmar_unit *unit);
   device_t dmar_get_requester(device_t dev, uint16_t *rid);
   
   void dmar_gas_init_domain(struct dmar_domain *domain);
   void dmar_gas_fini_domain(struct dmar_domain *domain);
   struct dmar_map_entry *dmar_gas_alloc_entry(struct dmar_domain *domain,
       u_int flags);
   void dmar_gas_free_entry(struct dmar_domain *domain,
       struct dmar_map_entry *entry);
   void dmar_gas_free_space(struct dmar_domain *domain,
       struct dmar_map_entry *entry);
   int dmar_gas_map(struct dmar_domain *domain,
       const struct bus_dma_tag_common *common, dmar_gaddr_t size, int offset,
       u_int eflags, u_int flags, vm_page_t *ma, struct dmar_map_entry **res);
   void dmar_gas_free_region(struct dmar_domain *domain,
       struct dmar_map_entry *entry);
   int dmar_gas_map_region(struct dmar_domain *domain,
       struct dmar_map_entry *entry, u_int eflags, u_int flags, vm_page_t *ma);
   int dmar_gas_reserve_region(struct dmar_domain *domain, dmar_gaddr_t start,
       dmar_gaddr_t end);
   
   void dmar_dev_parse_rmrr(struct dmar_domain *domain, int dev_domain,
       int dev_busno, const void *dev_path, int dev_path_len,
       struct dmar_map_entries_tailq *rmrr_entries);
   int dmar_instantiate_rmrr_ctxs(struct dmar_unit *dmar);
   
   void dmar_quirks_post_ident(struct dmar_unit *dmar);
   void dmar_quirks_pre_use(struct dmar_unit *dmar);
   
   int dmar_init_irt(struct dmar_unit *unit);
   void dmar_fini_irt(struct dmar_unit *unit);
   
   void dmar_set_buswide_ctx(struct dmar_unit *unit, u_int busno);
   bool dmar_is_buswide_ctx(struct dmar_unit *unit, u_int busno);
   
   #define DMAR_GM_CANWAIT 0x0001
   #define DMAR_GM_CANSPLIT 0x0002
   #define DMAR_GM_RMRR    0x0004
   
   #define DMAR_PGF_WAITOK 0x0001
   #define DMAR_PGF_ZERO   0x0002
   #define DMAR_PGF_ALLOC  0x0004
   #define DMAR_PGF_NOALLOC 0x0008
   #define DMAR_PGF_OBJL   0x0010
   
   extern dmar_haddr_t dmar_high;
   extern int haw;
   extern int dmar_tbl_pagecnt;
   extern int dmar_batch_coalesce;
   extern int dmar_check_free;
   
   static inline uint32_t
   dmar_read4(const struct dmar_unit *unit, int reg)
   {
   
           return (bus_read_4(unit->regs, reg));
   }
   
   static inline uint64_t
   dmar_read8(const struct dmar_unit *unit, int reg)
   {
   #ifdef __i386__
           uint32_t high, low;
   
           low = bus_read_4(unit->regs, reg);
           high = bus_read_4(unit->regs, reg + 4);
           return (low | ((uint64_t)high << 32));
   #else
           return (bus_read_8(unit->regs, reg));
   #endif
   }
   
   static inline void
   dmar_write4(const struct dmar_unit *unit, int reg, uint32_t val)
   {
   
           KASSERT(reg != DMAR_GCMD_REG || (val & DMAR_GCMD_TE) ==
               (unit->hw_gcmd & DMAR_GCMD_TE),
               ("dmar%d clearing TE 0x%08x 0x%08x", unit->unit,
               unit->hw_gcmd, val));
           bus_write_4(unit->regs, reg, val);
   }
   
   static inline void
   dmar_write8(const struct dmar_unit *unit, int reg, uint64_t val)
   {
   
           KASSERT(reg != DMAR_GCMD_REG, ("8byte GCMD write"));
   #ifdef __i386__
           uint32_t high, low;
   
           low = val;
           high = val >> 32;
           bus_write_4(unit->regs, reg, low);
           bus_write_4(unit->regs, reg + 4, high);
   #else
           bus_write_8(unit->regs, reg, val);
   #endif
   }
   
   /*
    * dmar_pte_store and dmar_pte_clear ensure that on i386, 32bit writes
    * are issued in the correct order.  For store, the lower word,
    * containing the P or R and W bits, is set only after the high word
    * is written.  For clear, the P bit is cleared first, then the high
    * word is cleared.
    *
    * dmar_pte_update updates the pte.  For amd64, the update is atomic.
    * For i386, it first disables the entry by clearing the word
    * containing the P bit, and then defer to dmar_pte_store.  The locked
    * cmpxchg8b is probably available on any machine having DMAR support,
    * but interrupt translation table may be mapped uncached.
    */
   static inline void
   dmar_pte_store1(volatile uint64_t *dst, uint64_t val)
   {
   #ifdef __i386__
           volatile uint32_t *p;
           uint32_t hi, lo;
   
           hi = val >> 32;
           lo = val;
           p = (volatile uint32_t *)dst;
           *(p + 1) = hi;
           *p = lo;
   #else
           *dst = val;
   #endif
   }
   
   static inline void
   dmar_pte_store(volatile uint64_t *dst, uint64_t val)
   {
   
           KASSERT(*dst == 0, ("used pte %p oldval %jx newval %jx",
               dst, (uintmax_t)*dst, (uintmax_t)val));
           dmar_pte_store1(dst, val);
   }
   
   static inline void
   dmar_pte_update(volatile uint64_t *dst, uint64_t val)
   {
   
   #ifdef __i386__
           volatile uint32_t *p;
   
           p = (volatile uint32_t *)dst;
           *p = 0;
   #endif
           dmar_pte_store1(dst, val);
   }
   
   static inline void
   dmar_pte_clear(volatile uint64_t *dst)
   {
   #ifdef __i386__
           volatile uint32_t *p;
   
           p = (volatile uint32_t *)dst;
           *p = 0;
           *(p + 1) = 0;
   #else
           *dst = 0;
   #endif
   }
   
   static inline bool
   dmar_test_boundary(dmar_gaddr_t start, dmar_gaddr_t size,
       dmar_gaddr_t boundary)
   {
   
           if (boundary == 0)
                   return (true);
           return (start + size <= ((start + boundary) & ~(boundary - 1)));
   }
   
   extern struct timespec dmar_hw_timeout;
   
   #define DMAR_WAIT_UNTIL(cond)                                   \
   {                                                               \
           struct timespec last, curr;                             \
           bool forever;                                           \
                                                                   \
           if (dmar_hw_timeout.tv_sec == 0 &&                      \
               dmar_hw_timeout.tv_nsec == 0) {                     \
                   forever = true;                                 \
           } else {                                                \
                   forever = false;                                \
                   nanouptime(&curr);                              \
                   timespecadd(&curr, &dmar_hw_timeout, &last);    \
           }                                                       \
           for (;;) {                                              \
                   if (cond) {                                     \
                           error = 0;                              \
                           break;                                  \
                   }                                               \
                   nanouptime(&curr);                              \
                   if (!forever && timespeccmp(&last, &curr, <)) { \
                           error = ETIMEDOUT;                      \
                           break;                                  \
                   }                                               \
                   cpu_spinwait();                                 \
           }                                                       \
   }
   
   #ifdef INVARIANTS
   #define TD_PREP_PINNED_ASSERT                                           \
           int old_td_pinned;                                              \
           old_td_pinned = curthread->td_pinned
   #define TD_PINNED_ASSERT                                                \
           KASSERT(curthread->td_pinned == old_td_pinned,                  \
               ("pin count leak: %d %d %s:%d", curthread->td_pinned,       \
               old_td_pinned, __FILE__, __LINE__))
   #else
   #define TD_PREP_PINNED_ASSERT
   #define TD_PINNED_ASSERT
   #endif
   
   #endif

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