/* * Physical memory management API * * Copyright 2011 Red Hat, Inc. and/or its affiliates * * Authors: * Avi Kivity * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. * */ #ifndef MEMORY_H #define MEMORY_H #include "exec/cpu-common.h" #include "exec/hwaddr.h" #include "exec/memattrs.h" #include "exec/memop.h" #include "exec/ramlist.h" #include "qemu/bswap.h" #include "qemu/queue.h" #include "qemu/int128.h" #define RAM_ADDR_INVALID (~(ram_addr_t)0) #define MAX_PHYS_ADDR_SPACE_BITS 62 #define MAX_PHYS_ADDR (((hwaddr)1 << MAX_PHYS_ADDR_SPACE_BITS) - 1) typedef struct MemoryRegionOps MemoryRegionOps; typedef struct IOMMUTLBEntry IOMMUTLBEntry; typedef uint64_t (*uc_cb_mmio_read_t)(struct uc_struct *uc, uint64_t addr, unsigned size, void *user_data); typedef void (*uc_cb_mmio_write_t)(struct uc_struct *uc, uint64_t addr, unsigned size, uint64_t data, void *user_data); /* See address_space_translate: bit 0 is read, bit 1 is write. */ typedef enum { IOMMU_NONE = 0, IOMMU_RO = 1, IOMMU_WO = 2, IOMMU_RW = 3, } IOMMUAccessFlags; #define IOMMU_ACCESS_FLAG(r, w) (((r) ? IOMMU_RO : 0) | ((w) ? IOMMU_WO : 0)) struct IOMMUTLBEntry { AddressSpace *target_as; hwaddr iova; hwaddr translated_addr; hwaddr addr_mask; /* 0xfff = 4k translation */ IOMMUAccessFlags perm; }; /* * Bitmap for different IOMMUNotifier capabilities. Each notifier can * register with one or multiple IOMMU Notifier capability bit(s). */ typedef enum { IOMMU_NOTIFIER_NONE = 0, /* Notify cache invalidations */ IOMMU_NOTIFIER_UNMAP = 0x1, /* Notify entry changes (newly created entries) */ IOMMU_NOTIFIER_MAP = 0x2, } IOMMUNotifierFlag; #define IOMMU_NOTIFIER_ALL (IOMMU_NOTIFIER_MAP | IOMMU_NOTIFIER_UNMAP) struct IOMMUNotifier; typedef void (*IOMMUNotify)(struct IOMMUNotifier *notifier, IOMMUTLBEntry *data); struct IOMMUNotifier { IOMMUNotify notify; IOMMUNotifierFlag notifier_flags; /* Notify for address space range start <= addr <= end */ hwaddr start; hwaddr end; int iommu_idx; QLIST_ENTRY(IOMMUNotifier) node; }; typedef struct IOMMUNotifier IOMMUNotifier; /* RAM is pre-allocated and passed into qemu_ram_alloc_from_ptr */ #define RAM_PREALLOC (1 << 0) /* RAM is mmap-ed with MAP_SHARED */ #define RAM_SHARED (1 << 1) /* Only a portion of RAM (used_length) is actually used, and migrated. * This used_length size can change across reboots. */ #define RAM_RESIZEABLE (1 << 2) /* UFFDIO_ZEROPAGE is available on this RAMBlock to atomically * zero the page and wake waiting processes. * (Set during postcopy) */ #define RAM_UF_ZEROPAGE (1 << 3) /* RAM can be migrated */ #define RAM_MIGRATABLE (1 << 4) /* RAM is a persistent kind memory */ #define RAM_PMEM (1 << 5) static inline void iommu_notifier_init(IOMMUNotifier *n, IOMMUNotify fn, IOMMUNotifierFlag flags, hwaddr start, hwaddr end, int iommu_idx) { n->notify = fn; n->notifier_flags = flags; n->start = start; n->end = end; n->iommu_idx = iommu_idx; } /* * Memory region callbacks */ struct MemoryRegionOps { /* Read from the memory region. @addr is relative to @mr; @size is * in bytes. */ uint64_t (*read)(struct uc_struct *uc, void *opaque, hwaddr addr, unsigned size); /* Write to the memory region. @addr is relative to @mr; @size is * in bytes. */ void (*write)(struct uc_struct *uc, void *opaque, hwaddr addr, uint64_t data, unsigned size); MemTxResult (*read_with_attrs)(struct uc_struct *uc, void *opaque, hwaddr addr, uint64_t *data, unsigned size, MemTxAttrs attrs); MemTxResult (*write_with_attrs)(struct uc_struct *, void *opaque, hwaddr addr, uint64_t data, unsigned size, MemTxAttrs attrs); enum device_endian endianness; /* Guest-visible constraints: */ struct { /* If nonzero, specify bounds on access sizes beyond which a machine * check is thrown. */ unsigned min_access_size; unsigned max_access_size; /* If true, unaligned accesses are supported. Otherwise unaligned * accesses throw machine checks. */ bool unaligned; /* * If present, and returns #false, the transaction is not accepted * by the device (and results in machine dependent behaviour such * as a machine check exception). */ bool (*accepts)(struct uc_struct *uc, void *opaque, hwaddr addr, unsigned size, bool is_write, MemTxAttrs attrs); } valid; /* Internal implementation constraints: */ struct { /* If nonzero, specifies the minimum size implemented. Smaller sizes * will be rounded upwards and a partial result will be returned. */ unsigned min_access_size; /* If nonzero, specifies the maximum size implemented. Larger sizes * will be done as a series of accesses with smaller sizes. */ unsigned max_access_size; /* If true, unaligned accesses are supported. Otherwise all accesses * are converted to (possibly multiple) naturally aligned accesses. */ bool unaligned; } impl; }; enum IOMMUMemoryRegionAttr { IOMMU_ATTR_SPAPR_TCE_FD }; /** * IOMMUMemoryRegionClass: * * All IOMMU implementations need to subclass TYPE_IOMMU_MEMORY_REGION * and provide an implementation of at least the @translate method here * to handle requests to the memory region. Other methods are optional. * * The IOMMU implementation must use the IOMMU notifier infrastructure * to report whenever mappings are changed, by calling * memory_region_notify_iommu() (or, if necessary, by calling * memory_region_notify_one() for each registered notifier). * * Conceptually an IOMMU provides a mapping from input address * to an output TLB entry. If the IOMMU is aware of memory transaction * attributes and the output TLB entry depends on the transaction * attributes, we represent this using IOMMU indexes. Each index * selects a particular translation table that the IOMMU has: * @attrs_to_index returns the IOMMU index for a set of transaction attributes * @translate takes an input address and an IOMMU index * and the mapping returned can only depend on the input address and the * IOMMU index. * * Most IOMMUs don't care about the transaction attributes and support * only a single IOMMU index. A more complex IOMMU might have one index * for secure transactions and one for non-secure transactions. */ typedef struct IOMMUMemoryRegionClass { /* * Return a TLB entry that contains a given address. * * The IOMMUAccessFlags indicated via @flag are optional and may * be specified as IOMMU_NONE to indicate that the caller needs * the full translation information for both reads and writes. If * the access flags are specified then the IOMMU implementation * may use this as an optimization, to stop doing a page table * walk as soon as it knows that the requested permissions are not * allowed. If IOMMU_NONE is passed then the IOMMU must do the * full page table walk and report the permissions in the returned * IOMMUTLBEntry. (Note that this implies that an IOMMU may not * return different mappings for reads and writes.) * * The returned information remains valid while the caller is * holding the big QEMU lock or is inside an RCU critical section; * if the caller wishes to cache the mapping beyond that it must * register an IOMMU notifier so it can invalidate its cached * information when the IOMMU mapping changes. * * @iommu: the IOMMUMemoryRegion * @hwaddr: address to be translated within the memory region * @flag: requested access permissions * @iommu_idx: IOMMU index for the translation */ IOMMUTLBEntry (*translate)(IOMMUMemoryRegion *iommu, hwaddr addr, IOMMUAccessFlags flag, int iommu_idx); /* Returns minimum supported page size in bytes. * If this method is not provided then the minimum is assumed to * be TARGET_PAGE_SIZE. * * @iommu: the IOMMUMemoryRegion */ uint64_t (*get_min_page_size)(IOMMUMemoryRegion *iommu); /* Get IOMMU misc attributes. This is an optional method that * can be used to allow users of the IOMMU to get implementation-specific * information. The IOMMU implements this method to handle calls * by IOMMU users to memory_region_iommu_get_attr() by filling in * the arbitrary data pointer for any IOMMUMemoryRegionAttr values that * the IOMMU supports. If the method is unimplemented then * memory_region_iommu_get_attr() will always return -EINVAL. * * @iommu: the IOMMUMemoryRegion * @attr: attribute being queried * @data: memory to fill in with the attribute data * * Returns 0 on success, or a negative errno; in particular * returns -EINVAL for unrecognized or unimplemented attribute types. */ int (*get_attr)(IOMMUMemoryRegion *iommu, enum IOMMUMemoryRegionAttr attr, void *data); /* Return the IOMMU index to use for a given set of transaction attributes. * * Optional method: if an IOMMU only supports a single IOMMU index then * the default implementation of memory_region_iommu_attrs_to_index() * will return 0. * * The indexes supported by an IOMMU must be contiguous, starting at 0. * * @iommu: the IOMMUMemoryRegion * @attrs: memory transaction attributes */ int (*attrs_to_index)(IOMMUMemoryRegion *iommu, MemTxAttrs attrs); /* Return the number of IOMMU indexes this IOMMU supports. * * Optional method: if this method is not provided, then * memory_region_iommu_num_indexes() will return 1, indicating that * only a single IOMMU index is supported. * * @iommu: the IOMMUMemoryRegion */ int (*num_indexes)(IOMMUMemoryRegion *iommu); } IOMMUMemoryRegionClass; /** MemoryRegion: * * A struct representing a memory region. */ struct MemoryRegion { /* private: */ /* The following fields should fit in a cache line */ bool ram; bool subpage; bool readonly; /* For RAM regions */ bool is_iommu; RAMBlock *ram_block; const MemoryRegionOps *ops; void *opaque; MemoryRegion *container; Int128 size; hwaddr addr; void (*destructor)(MemoryRegion *mr); uint64_t align; bool terminates; bool enabled; int32_t priority; QTAILQ_HEAD(, MemoryRegion) subregions; QTAILQ_ENTRY(MemoryRegion) subregions_link; struct uc_struct *uc; uint32_t perms; hwaddr end; }; struct IOMMUMemoryRegion { MemoryRegion parent_obj; QLIST_HEAD(, IOMMUNotifier) iommu_notify; IOMMUNotifierFlag iommu_notify_flags; IOMMUMemoryRegionClass cc; }; #define MEMORY_REGION(obj) ((MemoryRegion *)obj) #define IOMMU_MEMORY_REGION(obj) ((IOMMUMemoryRegion *)obj) #define IOMMU_MEMORY_REGION_CLASS(klass) ((IOMMUMemoryRegionClass *)klass) #define IOMMU_MEMORY_REGION_GET_CLASS(obj) (&((IOMMUMemoryRegion *)obj)->cc) #define IOMMU_NOTIFIER_FOREACH(n, mr) \ QLIST_FOREACH((n), &(mr)->iommu_notify, node) /** * MemoryListener: callbacks structure for updates to the physical memory map * * Allows a component to adjust to changes in the guest-visible memory map. * Use with memory_listener_register() and memory_listener_unregister(). */ struct MemoryListener { /** * @begin: * * Called at the beginning of an address space update transaction. * Followed by calls to #MemoryListener.region_add(), * #MemoryListener.region_del(), #MemoryListener.region_nop(), * #MemoryListener.log_start() and #MemoryListener.log_stop() in * increasing address order. * * @listener: The #MemoryListener. */ void (*begin)(MemoryListener *listener); /** * @commit: * * Called at the end of an address space update transaction, * after the last call to #MemoryListener.region_add(), * #MemoryListener.region_del() or #MemoryListener.region_nop(), * #MemoryListener.log_start() and #MemoryListener.log_stop(). * * @listener: The #MemoryListener. */ void (*commit)(MemoryListener *listener); /** * @region_add: * * Called during an address space update transaction, * for a section of the address space that is new in this address space * space since the last transaction. * * @listener: The #MemoryListener. * @section: The new #MemoryRegionSection. */ void (*region_add)(MemoryListener *listener, MemoryRegionSection *section); /** * @region_del: * * Called during an address space update transaction, * for a section of the address space that has disappeared in the address * space since the last transaction. * * @listener: The #MemoryListener. * @section: The old #MemoryRegionSection. */ void (*region_del)(MemoryListener *listener, MemoryRegionSection *section); /** * @region_nop: * * Called during an address space update transaction, * for a section of the address space that is in the same place in the address * space as in the last transaction. * * @listener: The #MemoryListener. * @section: The #MemoryRegionSection. */ void (*region_nop)(MemoryListener *listener, MemoryRegionSection *section); /* private: */ AddressSpace *address_space; QTAILQ_ENTRY(MemoryListener) link; QTAILQ_ENTRY(MemoryListener) link_as; }; /** * AddressSpace: describes a mapping of addresses to #MemoryRegion objects */ struct AddressSpace { /* private: */ MemoryRegion *root; /* Accessed via RCU. */ struct FlatView *current_map; QTAILQ_HEAD(, MemoryListener) listeners; QTAILQ_ENTRY(AddressSpace) address_spaces_link; struct uc_struct *uc; }; typedef struct AddressSpaceDispatch AddressSpaceDispatch; typedef struct FlatRange FlatRange; /* Flattened global view of current active memory hierarchy. Kept in sorted * order. */ struct FlatView { unsigned ref; FlatRange *ranges; unsigned nr; unsigned nr_allocated; struct AddressSpaceDispatch *dispatch; MemoryRegion *root; }; static inline FlatView *address_space_to_flatview(AddressSpace *as) { return as->current_map; } /** * MemoryRegionSection: describes a fragment of a #MemoryRegion * * @mr: the region, or %NULL if empty * @fv: the flat view of the address space the region is mapped in * @offset_within_region: the beginning of the section, relative to @mr's start * @size: the size of the section; will not exceed @mr's boundaries * @offset_within_address_space: the address of the first byte of the section * relative to the region's address space * @readonly: writes to this section are ignored */ struct MemoryRegionSection { Int128 size; MemoryRegion *mr; FlatView *fv; hwaddr offset_within_region; hwaddr offset_within_address_space; bool readonly; }; static inline bool MemoryRegionSection_eq(MemoryRegionSection *a, MemoryRegionSection *b) { return a->mr == b->mr && a->fv == b->fv && a->offset_within_region == b->offset_within_region && a->offset_within_address_space == b->offset_within_address_space && int128_eq(a->size, b->size) && a->readonly == b->readonly; } /** * memory_region_init: Initialize a memory region * * The region typically acts as a container for other memory regions. Use * memory_region_add_subregion() to add subregions. * * @mr: the #MemoryRegion to be initialized * @size: size of the region; any subregions beyond this size will be clipped */ void memory_region_init(struct uc_struct *uc, MemoryRegion *mr, uint64_t size); /** * memory_region_ref: Add 1 to a memory region's reference count * * Whenever memory regions are accessed outside the BQL, they need to be * preserved against hot-unplug. MemoryRegions actually do not have their * own reference count; they piggyback on a QOM object, their "owner". * This function adds a reference to the owner. * * All MemoryRegions must have an owner if they can disappear, even if the * device they belong to operates exclusively under the BQL. This is because * the region could be returned at any time by memory_region_find, and this * is usually under guest control. * * @mr: the #MemoryRegion */ void memory_region_ref(MemoryRegion *mr); /** * memory_region_init_io: Initialize an I/O memory region. * * Accesses into the region will cause the callbacks in @ops to be called. * if @size is nonzero, subregions will be clipped to @size. * * @mr: the #MemoryRegion to be initialized. * @ops: a structure containing read and write callbacks to be used when * I/O is performed on the region. * @opaque: passed to the read and write callbacks of the @ops structure. * @size: size of the region. */ void memory_region_init_io(struct uc_struct *uc, MemoryRegion *mr, const MemoryRegionOps *ops, void *opaque, uint64_t size); /** * memory_region_init_ram_ptr: Initialize RAM memory region from a * user-provided pointer. Accesses into the * region will modify memory directly. * * @mr: the #MemoryRegion to be initialized. * @size: size of the region. * @ptr: memory to be mapped; must contain at least @size bytes. * * Note that this function does not do anything to cause the data in the * RAM memory region to be migrated; that is the responsibility of the caller. */ void memory_region_init_ram_ptr(struct uc_struct *uc, MemoryRegion *mr, uint64_t size, void *ptr); /** * memory_region_init_ram - Initialize RAM memory region. Accesses into the * region will modify memory directly. * * @mr: the #MemoryRegion to be initialized * TYPE_DEVICE or a subclass of TYPE_DEVICE, or NULL) * @size: size of the region in bytes * * This function allocates RAM for a board model or device, and * arranges for it to be migrated (by calling vmstate_register_ram() * if @owner is a DeviceState, or vmstate_register_ram_global() if * @owner is NULL). * * TODO: Currently we restrict @owner to being either NULL (for * global RAM regions with no owner) or devices, so that we can * give the RAM block a unique name for migration purposes. * We should lift this restriction and allow arbitrary Objects. * If you pass a non-NULL non-device @owner then we will assert. */ void memory_region_init_ram(struct uc_struct *uc, MemoryRegion *mr, uint64_t size, uint32_t perms); /** * memory_region_size: get a memory region's size. * * @mr: the memory region being queried. */ uint64_t memory_region_size(MemoryRegion *mr); /** * memory_region_is_ram: check whether a memory region is random access * * Returns %true if a memory region is random access. * * @mr: the memory region being queried */ static inline bool memory_region_is_ram(MemoryRegion *mr) { return mr->ram; } /** * memory_region_get_iommu: check whether a memory region is an iommu * * Returns pointer to IOMMUMemoryRegion if a memory region is an iommu, * otherwise NULL. * * @mr: the memory region being queried */ static inline IOMMUMemoryRegion *memory_region_get_iommu(MemoryRegion *mr) { if (mr->is_iommu) { return (IOMMUMemoryRegion *) mr; } return NULL; } /** * memory_region_get_iommu_class_nocheck: returns iommu memory region class * if an iommu or NULL if not * * Returns pointer to IOMMUMemoryRegionClass if a memory region is an iommu, * otherwise NULL. This is fast path avoiding QOM checking, use with caution. * * @iommu_mr: the memory region being queried */ static inline IOMMUMemoryRegionClass *memory_region_get_iommu_class_nocheck( IOMMUMemoryRegion *iommu_mr) { return &iommu_mr->cc; } /** * memory_region_from_host: Convert a pointer into a RAM memory region * and an offset within it. * * Given a host pointer inside a RAM memory region (created with * memory_region_init_ram() or memory_region_init_ram_ptr()), return * the MemoryRegion and the offset within it. * * Use with care; by the time this function returns, the returned pointer is * not protected by RCU anymore. If the caller is not within an RCU critical * section and does not hold the iothread lock, it must have other means of * protecting the pointer, such as a reference to the region that includes * the incoming ram_addr_t. * * @ptr: the host pointer to be converted * @offset: the offset within memory region */ MemoryRegion *memory_region_from_host(struct uc_struct *uc, void *ptr, ram_addr_t *offset); /** * memory_region_set_readonly: Turn a memory region read-only (or read-write) * * Allows a memory region to be marked as read-only (turning it into a ROM). * only useful on RAM regions. * * @mr: the region being updated. * @readonly: whether rhe region is to be ROM or RAM. */ void memory_region_set_readonly(MemoryRegion *mr, bool readonly); /** * memory_region_get_ram_ptr: Get a pointer into a RAM memory region. * * Returns a host pointer to a RAM memory region (created with * memory_region_init_ram() or memory_region_init_ram_ptr()). * * Use with care; by the time this function returns, the returned pointer is * not protected by RCU anymore. If the caller is not within an RCU critical * section and does not hold the iothread lock, it must have other means of * protecting the pointer, such as a reference to the region that includes * the incoming ram_addr_t. * * @mr: the memory region being queried. */ void *memory_region_get_ram_ptr(MemoryRegion *mr); /** * memory_region_add_subregion: Add a subregion to a container. * * Adds a subregion at @offset. The subregion may not overlap with other * subregions (except for those explicitly marked as overlapping). A region * may only be added once as a subregion (unless removed with * memory_region_del_subregion()); use memory_region_init_alias() if you * want a region to be a subregion in multiple locations. * * @mr: the region to contain the new subregion; must be a container * initialized with memory_region_init(). * @offset: the offset relative to @mr where @subregion is added. * @subregion: the subregion to be added. */ void memory_region_add_subregion(MemoryRegion *mr, hwaddr offset, MemoryRegion *subregion); /** * memory_region_add_subregion_overlap: Add a subregion to a container * with overlap. * * Adds a subregion at @offset. The subregion may overlap with other * subregions. Conflicts are resolved by having a higher @priority hide a * lower @priority. Subregions without priority are taken as @priority 0. * A region may only be added once as a subregion (unless removed with * memory_region_del_subregion()); use memory_region_init_alias() if you * want a region to be a subregion in multiple locations. * * @mr: the region to contain the new subregion; must be a container * initialized with memory_region_init(). * @offset: the offset relative to @mr where @subregion is added. * @subregion: the subregion to be added. * @priority: used for resolving overlaps; highest priority wins. */ void memory_region_add_subregion_overlap(MemoryRegion *mr, hwaddr offset, MemoryRegion *subregion, int priority); /** * memory_region_filter_subregions: filter subregios by priority. * * remove all subregions beginning by a specified subregion */ void memory_region_filter_subregions(MemoryRegion *mr, int32_t level); /** * memory_region_get_ram_addr: Get the ram address associated with a memory * region * * @mr: the region to be queried */ ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr); /** * memory_region_del_subregion: Remove a subregion. * * Removes a subregion from its container. * * @mr: the container to be updated. * @subregion: the region being removed; must be a current subregion of @mr. */ void memory_region_del_subregion(MemoryRegion *mr, MemoryRegion *subregion); /** * memory_region_find: translate an address/size relative to a * MemoryRegion into a #MemoryRegionSection. * * Locates the first #MemoryRegion within @mr that overlaps the range * given by @addr and @size. * * Returns a #MemoryRegionSection that describes a contiguous overlap. * It will have the following characteristics: * - @size = 0 iff no overlap was found * - @mr is non-%NULL iff an overlap was found * * Remember that in the return value the @offset_within_region is * relative to the returned region (in the .@mr field), not to the * @mr argument. * * Similarly, the .@offset_within_address_space is relative to the * address space that contains both regions, the passed and the * returned one. However, in the special case where the @mr argument * has no container (and thus is the root of the address space), the * following will hold: * - @offset_within_address_space >= @addr * - @offset_within_address_space + .@size <= @addr + @size * * @mr: a MemoryRegion within which @addr is a relative address * @addr: start of the area within @as to be searched * @size: size of the area to be searched */ MemoryRegionSection memory_region_find(MemoryRegion *mr, hwaddr addr, uint64_t size); /** * memory_listener_register: register callbacks to be called when memory * sections are mapped or unmapped into an address * space * * @listener: an object containing the callbacks to be called * @filter: if non-%NULL, only regions in this address space will be observed */ void memory_listener_register(MemoryListener *listener, AddressSpace *filter); /** * memory_listener_unregister: undo the effect of memory_listener_register() * * @listener: an object containing the callbacks to be removed */ void memory_listener_unregister(MemoryListener *listener); /** * memory_region_dispatch_read: perform a read directly to the specified * MemoryRegion. * * @mr: #MemoryRegion to access * @addr: address within that region * @pval: pointer to uint64_t which the data is written to * @op: size, sign, and endianness of the memory operation * @attrs: memory transaction attributes to use for the access */ MemTxResult memory_region_dispatch_read(struct uc_struct *uc, MemoryRegion *mr, hwaddr addr, uint64_t *pval, MemOp op, MemTxAttrs attrs); /** * memory_region_dispatch_write: perform a write directly to the specified * MemoryRegion. * * @mr: #MemoryRegion to access * @addr: address within that region * @data: data to write * @op: size, sign, and endianness of the memory operation * @attrs: memory transaction attributes to use for the access */ MemTxResult memory_region_dispatch_write(struct uc_struct *uc, MemoryRegion *mr, hwaddr addr, uint64_t data, MemOp op, MemTxAttrs attrs); /** * address_space_init: initializes an address space * * @as: an uninitialized #AddressSpace * @root: a #MemoryRegion that routes addresses for the address space */ void address_space_init(struct uc_struct *uc, AddressSpace *as, MemoryRegion *root); /** * address_space_destroy: destroy an address space * * Releases all resources associated with an address space. After an address space * is destroyed, its root memory region (given by address_space_init()) may be destroyed * as well. * * @as: address space to be destroyed */ void address_space_destroy(AddressSpace *as); /** * address_space_remove_listeners: unregister all listeners of an address space * * Removes all callbacks previously registered with memory_listener_register() * for @as. * * @as: an initialized #AddressSpace */ void address_space_remove_listeners(AddressSpace *as); /** * address_space_rw: read from or write to an address space. * * Return a MemTxResult indicating whether the operation succeeded * or failed (eg unassigned memory, device rejected the transaction, * IOMMU fault). * * @as: #AddressSpace to be accessed * @addr: address within that address space * @attrs: memory transaction attributes * @buf: buffer with the data transferred * @len: the number of bytes to read or write * @is_write: indicates the transfer direction */ MemTxResult address_space_rw(AddressSpace *as, hwaddr addr, MemTxAttrs attrs, void *buf, hwaddr len, bool is_write); /** * address_space_write: write to address space. * * Return a MemTxResult indicating whether the operation succeeded * or failed (eg unassigned memory, device rejected the transaction, * IOMMU fault). * * @as: #AddressSpace to be accessed * @addr: address within that address space * @attrs: memory transaction attributes * @buf: buffer with the data transferred * @len: the number of bytes to write */ MemTxResult address_space_write(AddressSpace *as, hwaddr addr, MemTxAttrs attrs, const void *buf, hwaddr len); /** * address_space_write_rom: write to address space, including ROM. * * This function writes to the specified address space, but will * write data to both ROM and RAM. This is used for non-guest * writes like writes from the gdb debug stub or initial loading * of ROM contents. * * Note that portions of the write which attempt to write data to * a device will be silently ignored -- only real RAM and ROM will * be written to. * * Return a MemTxResult indicating whether the operation succeeded * or failed (eg unassigned memory, device rejected the transaction, * IOMMU fault). * * @as: #AddressSpace to be accessed * @addr: address within that address space * @attrs: memory transaction attributes * @buf: buffer with the data transferred * @len: the number of bytes to write */ MemTxResult address_space_write_rom(AddressSpace *as, hwaddr addr, MemTxAttrs attrs, const void *buf, hwaddr len); /* address_space_ld*: load from an address space * address_space_st*: store to an address space * * These functions perform a load or store of the byte, word, * longword or quad to the specified address within the AddressSpace. * The _le suffixed functions treat the data as little endian; * _be indicates big endian; no suffix indicates "same endianness * as guest CPU". * * The "guest CPU endianness" accessors are deprecated for use outside * target-* code; devices should be CPU-agnostic and use either the LE * or the BE accessors. * * @as #AddressSpace to be accessed * @addr: address within that address space * @val: data value, for stores * @attrs: memory transaction attributes * @result: location to write the success/failure of the transaction; * if NULL, this information is discarded */ #ifdef UNICORN_ARCH_POSTFIX #define SUFFIX UNICORN_ARCH_POSTFIX #else #define SUFFIX #endif #define ARG1 as #define ARG1_DECL AddressSpace *as #include "exec/memory_ldst.inc.h" #ifdef UNICORN_ARCH_POSTFIX #define SUFFIX UNICORN_ARCH_POSTFIX #else #define SUFFIX #endif #define ARG1 as #define ARG1_DECL AddressSpace *as #include "exec/memory_ldst_phys.inc.h" struct MemoryRegionCache { void *ptr; hwaddr xlat; hwaddr len; FlatView *fv; MemoryRegionSection mrs; bool is_write; }; #define MEMORY_REGION_CACHE_INVALID ((MemoryRegionCache) { .mrs.mr = NULL }) /* address_space_ld*_cached: load from a cached #MemoryRegion * address_space_st*_cached: store into a cached #MemoryRegion * * These functions perform a load or store of the byte, word, * longword or quad to the specified address. The address is * a physical address in the AddressSpace, but it must lie within * a #MemoryRegion that was mapped with address_space_cache_init. * * The _le suffixed functions treat the data as little endian; * _be indicates big endian; no suffix indicates "same endianness * as guest CPU". * * The "guest CPU endianness" accessors are deprecated for use outside * target-* code; devices should be CPU-agnostic and use either the LE * or the BE accessors. * * @cache: previously initialized #MemoryRegionCache to be accessed * @addr: address within the address space * @val: data value, for stores * @attrs: memory transaction attributes * @result: location to write the success/failure of the transaction; * if NULL, this information is discarded */ #ifdef UNICORN_ARCH_POSTFIX #define SUFFIX glue(_cached_slow, UNICORN_ARCH_POSTFIX) #else #define SUFFIX _cached_slow #endif #define ARG1 cache #define ARG1_DECL MemoryRegionCache *cache #include "exec/memory_ldst.inc.h" /* Inline fast path for direct RAM access. */ #ifdef UNICORN_ARCH_POSTFIX static inline uint8_t glue(address_space_ldub_cached, UNICORN_ARCH_POSTFIX)(struct uc_struct *uc, MemoryRegionCache *cache, #else static inline uint8_t address_space_ldub_cached(struct uc_struct *uc, MemoryRegionCache *cache, #endif hwaddr addr, MemTxAttrs attrs, MemTxResult *result) { assert(addr < cache->len); if (likely(cache->ptr)) { return ldub_p((char *)cache->ptr + addr); } else { #ifdef UNICORN_ARCH_POSTFIX return glue(address_space_ldub_cached_slow, UNICORN_ARCH_POSTFIX)(uc, cache, addr, attrs, result); #else return address_space_ldub_cached_slow(uc, cache, addr, attrs, result); #endif } } #ifdef UNICORN_ARCH_POSTFIX static inline void glue(address_space_stb_cached, UNICORN_ARCH_POSTFIX)(struct uc_struct *uc, MemoryRegionCache *cache, #else static inline void address_space_stb_cached(struct uc_struct *uc, MemoryRegionCache *cache, #endif hwaddr addr, uint32_t val, MemTxAttrs attrs, MemTxResult *result) { assert(addr < cache->len); if (likely(cache->ptr)) { stb_p((char *)cache->ptr + addr, val); } else { #ifdef UNICORN_ARCH_POSTFIX glue(address_space_stb_cached_slow, UNICORN_ARCH_POSTFIX)(uc, cache, addr, val, attrs, result); #else address_space_stb_cached_slow(uc, cache, addr, val, attrs, result); #endif } } #define ENDIANNESS _le #include "exec/memory_ldst_cached.inc.h" #define ENDIANNESS _be #include "exec/memory_ldst_cached.inc.h" #ifdef UNICORN_ARCH_POSTFIX #define SUFFIX glue(_cached, UNICORN_ARCH_POSTFIX) #else #define SUFFIX _cached #endif #define ARG1 cache #define ARG1_DECL MemoryRegionCache *cache #include "exec/memory_ldst_phys.inc.h" /* address_space_translate: translate an address range into an address space * into a MemoryRegion and an address range into that section. Should be * called from an RCU critical section, to avoid that the last reference * to the returned region disappears after address_space_translate returns. * * @fv: #FlatView to be accessed * @addr: address within that address space * @xlat: pointer to address within the returned memory region section's * #MemoryRegion. * @len: pointer to length * @is_write: indicates the transfer direction * @attrs: memory attributes */ MemoryRegion *flatview_translate(struct uc_struct *uc, FlatView *fv, hwaddr addr, hwaddr *xlat, hwaddr *len, bool is_write, MemTxAttrs attrs); static inline MemoryRegion *address_space_translate(AddressSpace *as, hwaddr addr, hwaddr *xlat, hwaddr *len, bool is_write, MemTxAttrs attrs) { return flatview_translate(as->uc, address_space_to_flatview(as), addr, xlat, len, is_write, attrs); } /* address_space_access_valid: check for validity of accessing an address * space range * * Check whether memory is assigned to the given address space range, and * access is permitted by any IOMMU regions that are active for the address * space. * * For now, addr and len should be aligned to a page size. This limitation * will be lifted in the future. * * @as: #AddressSpace to be accessed * @addr: address within that address space * @len: length of the area to be checked * @is_write: indicates the transfer direction * @attrs: memory attributes */ bool address_space_access_valid(AddressSpace *as, hwaddr addr, hwaddr len, bool is_write, MemTxAttrs attrs); /* address_space_map: map a physical memory region into a host virtual address * * May map a subset of the requested range, given by and returned in @plen. * May return %NULL if resources needed to perform the mapping are exhausted. * Use only for reads OR writes - not for read-modify-write operations. * Use cpu_register_map_client() to know when retrying the map operation is * likely to succeed. * * @as: #AddressSpace to be accessed * @addr: address within that address space * @plen: pointer to length of buffer; updated on return * @is_write: indicates the transfer direction * @attrs: memory attributes */ void *address_space_map(AddressSpace *as, hwaddr addr, hwaddr *plen, bool is_write, MemTxAttrs attrs); /* address_space_unmap: Unmaps a memory region previously mapped by address_space_map() * * Will also mark the memory as dirty if @is_write == %true. @access_len gives * the amount of memory that was actually read or written by the caller. * * @as: #AddressSpace used * @buffer: host pointer as returned by address_space_map() * @len: buffer length as returned by address_space_map() * @access_len: amount of data actually transferred * @is_write: indicates the transfer direction */ void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len, bool is_write, hwaddr access_len); /* Internal functions, part of the implementation of address_space_read. */ MemTxResult address_space_read_full(AddressSpace *as, hwaddr addr, MemTxAttrs attrs, void *buf, hwaddr len); MemTxResult flatview_read_continue(struct uc_struct *, FlatView *fv, hwaddr addr, MemTxAttrs attrs, void *buf, hwaddr len, hwaddr addr1, hwaddr l, MemoryRegion *mr); void *qemu_map_ram_ptr(struct uc_struct *uc, RAMBlock *ram_block, ram_addr_t addr); static inline bool memory_access_is_direct(MemoryRegion *mr, bool is_write) { if (is_write) { return memory_region_is_ram(mr) && !mr->readonly; } else { return memory_region_is_ram(mr); } } /** * address_space_read: read from an address space. * * Return a MemTxResult indicating whether the operation succeeded * or failed (eg unassigned memory, device rejected the transaction, * IOMMU fault). Called within RCU critical section. * * @as: #AddressSpace to be accessed * @addr: address within that address space * @attrs: memory transaction attributes * @buf: buffer with the data transferred * @len: length of the data transferred */ #ifndef _MSC_VER static inline __attribute__((__always_inline__)) #else static inline #endif MemTxResult address_space_read(AddressSpace *as, hwaddr addr, MemTxAttrs attrs, void *buf, hwaddr len) { MemTxResult result = MEMTX_OK; #ifndef _MSC_VER hwaddr l, addr1; void *ptr; MemoryRegion *mr; FlatView *fv; if (__builtin_constant_p(len)) { if (len) { fv = address_space_to_flatview(as); l = len; mr = flatview_translate(as->uc, fv, addr, &addr1, &l, false, attrs); if (len == l && memory_access_is_direct(mr, false)) { ptr = qemu_map_ram_ptr(mr->uc, mr->ram_block, addr1); memcpy(buf, ptr, len); } else { result = flatview_read_continue(as->uc, fv, addr, attrs, buf, len, addr1, l, mr); } } } else { result = address_space_read_full(as, addr, attrs, buf, len); } #else result = address_space_read_full(as, addr, attrs, buf, len); #endif return result; } #ifdef NEED_CPU_H /* enum device_endian to MemOp. */ static inline MemOp devend_memop(enum device_endian end) { QEMU_BUILD_BUG_ON(DEVICE_HOST_ENDIAN != DEVICE_LITTLE_ENDIAN && DEVICE_HOST_ENDIAN != DEVICE_BIG_ENDIAN); #if defined(HOST_WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN) /* Swap if non-host endianness or native (target) endianness */ return (end == DEVICE_HOST_ENDIAN) ? 0 : MO_BSWAP; #else const int non_host_endianness = DEVICE_LITTLE_ENDIAN ^ DEVICE_BIG_ENDIAN ^ DEVICE_HOST_ENDIAN; /* In this case, native (target) endianness needs no swap. */ return (end == non_host_endianness) ? MO_BSWAP : 0; #endif } #endif MemoryRegion *memory_map(struct uc_struct *uc, hwaddr begin, size_t size, uint32_t perms); MemoryRegion *memory_map_ptr(struct uc_struct *uc, hwaddr begin, size_t size, uint32_t perms, void *ptr); MemoryRegion *memory_map_io(struct uc_struct *uc, ram_addr_t begin, size_t size, uc_cb_mmio_read_t read_cb, uc_cb_mmio_write_t write_cb, void *user_data_read, void *user_data_write); MemoryRegion *memory_cow(struct uc_struct *uc, MemoryRegion *parrent, hwaddr begin, size_t size); void memory_unmap(struct uc_struct *uc, MemoryRegion *mr); void memory_moveout(struct uc_struct *uc, MemoryRegion *mr); void memory_movein(struct uc_struct *uc, MemoryRegion *mr); int memory_free(struct uc_struct *uc); #endif