FreeBSD/Linux Kernel Cross Reference
sys/osfmk/ppc/cpu_capabilities.h

     /*
      * Copyright (c) 2003-2006 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
      * Version 2.0 (the 'License'). You may not use this file except in
      * compliance with the License. The rights granted to you under the License
     * may not be used to create, or enable the creation or redistribution of,
     * unlawful or unlicensed copies of an Apple operating system, or to
     * circumvent, violate, or enable the circumvention or violation of, any
     * terms of an Apple operating system software license agreement.
     * 
     * Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
     */
    #ifdef  PRIVATE
    
    #ifndef _PPC_CPU_CAPABILITIES_H
    #define _PPC_CPU_CAPABILITIES_H
    
    /* _cpu_capabilities
     *
     * This is the authoritative way to determine from user mode what
     * implementation-specific processor features are available.
     * This API is only supported for Apple internal use.
     */
    
    #ifndef __ASSEMBLER__
     
    extern int _cpu_capabilities;
     
    #endif /* __ASSEMBLER__ */
    
    /* Bit definitions for _cpu_capabilities: */
    
    #define kHasAltivec                             0x00000001
    #define k64Bit                                  0x00000002      // 64-bit GPRs
    #define kCache32                                0x00000004      // cache line size is 32 bytes
    #define kCache64                                0x00000008
    #define kCache128                               0x00000010
    #define kDcbaRecommended                0x00000020      // PPC: dcba is available and recommended
    #define kDcbaAvailable                  0x00000040      // PPC: dcba is available (but may or may not be recommended)
    #define kDataStreamsRecommended 0x00000080      // PPC: dst, dstt, dstst, dss, and dssall instructions available and recommended
    #define kDataStreamsAvailable   0x00000100      // PPC: dst, dstt, dstst, dss, and dssall instructions available (may or may not be rec'd)
    #define kDcbtStreamsRecommended 0x00000200      // PPC: enhanced dcbt instruction available and recommended
    #define kDcbtStreamsAvailable   0x00000400      // PPC: enhanced dcbt instruction available (but may or may not be recommended)
    #define kFastThreadLocalStorage 0x00000800      // TLS ptr is kept in a user-mode-readable register
    
    #define kUP                                             0x00008000      // set if (kNumCPUs == 1)
    #define kNumCPUs                                0x00FF0000      // number of CPUs (see _NumCPUs() below)
    
    #define kNumCPUsShift                   16                      // see _NumCPUs() below
    
    #define kHasGraphicsOps                 0x08000000      // PPC: has fres, frsqrte, and fsel instructions
    #define kHasStfiwx                              0x10000000      // PPC: has stfiwx instruction
    #define kHasFsqrt                               0x20000000      // PPC: has fsqrt and fsqrts instructions
    
    #ifndef __ASSEMBLER__
     
    static __inline__ int _NumCPUs( void ) { return (_cpu_capabilities & kNumCPUs) >> kNumCPUsShift; }
    
    #endif /* __ASSEMBLER__ */
    
    
    /*
     * The shared kernel/user "comm page(s)":
     *
     * The last eight pages of every address space are reserved for the kernel/user
     * "comm area".  Because they can be addressed via a sign-extended 16-bit field,
     * it is particularly efficient to access code or data in the comm area with
     * absolute branches (ba, bla, bca) or absolute load/stores ("lwz r0,-4096(0)").
     * Because the comm area can be reached from anywhere, dyld is not needed.
     * Although eight pages are reserved, presently only two are populated and mapped.
     *
     * Routines on the comm page(s) can be thought of as the firmware for extended processor
     * instructions, whose opcodes are special forms of "bla".  Ie, they are cpu
     * capabilities.  During system initialization, the kernel populates the comm page with
     * code customized for the particular processor and platform.
     *
     * Because Mach VM cannot map the last page of an address space, the max length of
     * the comm area is seven pages.
     */
     
    #define _COMM_PAGE_BASE_ADDRESS                 (-8*4096)                                               // start at page -8, ie 0xFFFF8000
    #define _COMM_PAGE_AREA_LENGTH                  ( 7*4096)                                               // reserved length of entire comm area
    #define _COMM_PAGE_AREA_USED                    ( 2*4096)                                               // we use two pages so far
    
   /* The following set of definitions are used in the kernel, which needs to distinguish between
    * the 32 and 64-bit commpage addresses and lengths.  On PPC they are the same, but on Imtel
    * they are not.
    */
   #define _COMM_PAGE32_BASE_ADDRESS               ( _COMM_PAGE_BASE_ADDRESS )
   #define _COMM_PAGE64_BASE_ADDRESS               ( _COMM_PAGE_BASE_ADDRESS )
   #define _COMM_PAGE32_AREA_LENGTH                ( _COMM_PAGE_AREA_LENGTH )
   #define _COMM_PAGE64_AREA_LENGTH                ( _COMM_PAGE_AREA_LENGTH )
   #define _COMM_PAGE32_AREA_USED                  ( _COMM_PAGE_AREA_USED )
   #define _COMM_PAGE64_AREA_USED                  ( _COMM_PAGE_AREA_USED )
   
   /* The Objective-C runtime fixed address page to optimize message dispatch */
   #define _OBJC_PAGE_BASE_ADDRESS                 (-20*4096)                                              // start at page -20, ie 0xFFFEC000
    
   /*
    * Objective-C needs an "absolute" area all the way up to the top of the
    * address space.
    * For a ppc32 task, that area gets allocated at runtime from user space.
    * For a ppc64 task, that area is not within the user-accessible address range,
    * so we pre-allocate it at exec time (see vm_map_exec()) along with the
    * comm page.
    * 
    * NOTE: that means we can't "nest" the 64-bit comm page...
    */
   #define _COMM_PAGE32_OBJC_SIZE  0ULL
   #define _COMM_PAGE32_OBJC_BASE  0ULL
   #if 0
   #define _COMM_PAGE64_OBJC_SIZE  (4 * 4096)
   #define _COMM_PAGE64_OBJC_BASE  (_OBJC_PAGE_BASE_ADDRESS)
   #else
   /*
    * PPC51: ppc64 is limited to 51-bit addresses.
    * PPC64 has a 51-bit address space limit, so we can't just go and
    * map the Obj-C area up there.  We would have to create a nested pmap
    * and make a special mapping that redirects the large virtual addresses to
    * that other address space with lower addresses that fit within the 51-bit
    * limit.
    * VM would then have to handle this redirection when we fault one
    * of these pages in but it doesn't do that at this point, so no
    * Obj-C area for ppc64 for now :-(
    */
   #define _COMM_PAGE64_OBJC_SIZE  0ULL
   #define _COMM_PAGE64_OBJC_BASE  0ULL
   #endif
   
   /* data in the comm page */
    
   #define _COMM_PAGE_SIGNATURE                    (_COMM_PAGE_BASE_ADDRESS+0x000) // first few bytes are a signature
   #define _COMM_PAGE_VERSION                              (_COMM_PAGE_BASE_ADDRESS+0x01E) // 16-bit version#
   #define _COMM_PAGE_THIS_VERSION                 2                                                               // this is version 2 of the commarea format
     
   #define _COMM_PAGE_CPU_CAPABILITIES             (_COMM_PAGE_BASE_ADDRESS+0x020) // mirror of extern int _cpu_capabilities
   #define _COMM_PAGE_NCPUS                                (_COMM_PAGE_BASE_ADDRESS+0x021) // number of configured CPUs
   #define _COMM_PAGE_ALTIVEC                              (_COMM_PAGE_BASE_ADDRESS+0x024) // nonzero if Altivec available
   #define _COMM_PAGE_64_BIT                               (_COMM_PAGE_BASE_ADDRESS+0x025) // nonzero if 64-bit processor
   #define _COMM_PAGE_CACHE_LINESIZE               (_COMM_PAGE_BASE_ADDRESS+0x026) // cache line size (16-bit field)
    
   #define _COMM_PAGE_UNUSED1                              (_COMM_PAGE_BASE_ADDRESS+0x028) // 24 unused bytes
    
   #define _COMM_PAGE_2_TO_52                              (_COMM_PAGE_BASE_ADDRESS+0x040) // double float constant 2**52
   #define _COMM_PAGE_10_TO_6                              (_COMM_PAGE_BASE_ADDRESS+0x048) // double float constant 10**6
   #define _COMM_PAGE_MAGIC_FE             (_COMM_PAGE_BASE_ADDRESS+0x050) // magic constant 0xFEFEFEFEFEFEFEFF (to find 0s)
   #define _COMM_PAGE_MAGIC_80             (_COMM_PAGE_BASE_ADDRESS+0x058) // magic constant 0x8080808080808080 (to find 0s)
    
   #define _COMM_PAGE_TIMEBASE                             (_COMM_PAGE_BASE_ADDRESS+0x060) // used by gettimeofday()
   #define _COMM_PAGE_TIMESTAMP                    (_COMM_PAGE_BASE_ADDRESS+0x068) // used by gettimeofday()
   #define _COMM_PAGE_SEC_PER_TICK                 (_COMM_PAGE_BASE_ADDRESS+0x070) // used by gettimeofday()
    
    /* jump table (bla to this address, which may be a branch to the actual code somewhere else) */
    /* When new jump table entries are added, corresponding symbols should be added below         */
    
   #define _COMM_PAGE_COMPARE_AND_SWAP32   (_COMM_PAGE_BASE_ADDRESS+0x080) // compare-and-swap word, no barrier
   #define _COMM_PAGE_COMPARE_AND_SWAP64   (_COMM_PAGE_BASE_ADDRESS+0x0c0) // compare-and-swap doubleword, no barrier
   #define _COMM_PAGE_ENQUEUE                              (_COMM_PAGE_BASE_ADDRESS+0x100) // enqueue
   #define _COMM_PAGE_DEQUEUE                              (_COMM_PAGE_BASE_ADDRESS+0x140) // dequeue
   #define _COMM_PAGE_MEMORY_BARRIER               (_COMM_PAGE_BASE_ADDRESS+0x180) // memory barrier
   #define _COMM_PAGE_ATOMIC_ADD32                 (_COMM_PAGE_BASE_ADDRESS+0x1a0) // add atomic word
   #define _COMM_PAGE_ATOMIC_ADD64                 (_COMM_PAGE_BASE_ADDRESS+0x1c0) // add atomic doubleword
   
   #define _COMM_PAGE_UNUSED3                              (_COMM_PAGE_BASE_ADDRESS+0x1e0) // 32 unused bytes
   
   #define _COMM_PAGE_ABSOLUTE_TIME                (_COMM_PAGE_BASE_ADDRESS+0x200) // mach_absolute_time()
   #define _COMM_PAGE_SPINLOCK_TRY                 (_COMM_PAGE_BASE_ADDRESS+0x220) // spinlock_try()
   #define _COMM_PAGE_SPINLOCK_LOCK                (_COMM_PAGE_BASE_ADDRESS+0x260) // spinlock_lock()
   #define _COMM_PAGE_SPINLOCK_UNLOCK              (_COMM_PAGE_BASE_ADDRESS+0x2a0) // spinlock_unlock()
   #define _COMM_PAGE_PTHREAD_GETSPECIFIC  (_COMM_PAGE_BASE_ADDRESS+0x2c0) // pthread_getspecific()
   #define _COMM_PAGE_GETTIMEOFDAY                 (_COMM_PAGE_BASE_ADDRESS+0x2e0) // used by gettimeofday()
   #define _COMM_PAGE_FLUSH_DCACHE                 (_COMM_PAGE_BASE_ADDRESS+0x4e0) // sys_dcache_flush()
   #define _COMM_PAGE_FLUSH_ICACHE                 (_COMM_PAGE_BASE_ADDRESS+0x520) // sys_icache_invalidate()
   #define _COMM_PAGE_PTHREAD_SELF                 (_COMM_PAGE_BASE_ADDRESS+0x580) // pthread_self()
   
   #define _COMM_PAGE_UNUSED4                              (_COMM_PAGE_BASE_ADDRESS+0x5a0) // 32 unused bytes
   
   #define _COMM_PAGE_RELINQUISH                   (_COMM_PAGE_BASE_ADDRESS+0x5c0) // used by spinlocks
    
   #define _COMM_PAGE_UNUSED5                              (_COMM_PAGE_BASE_ADDRESS+0x5e0) // 32 unused bytes
    
   #define _COMM_PAGE_BZERO                                (_COMM_PAGE_BASE_ADDRESS+0x600) // bzero()
   #define _COMM_PAGE_BCOPY                                (_COMM_PAGE_BASE_ADDRESS+0x780) // bcopy()
   #define _COMM_PAGE_MEMCPY                               (_COMM_PAGE_BASE_ADDRESS+0x7a0) // memcpy()
   #define _COMM_PAGE_MEMMOVE                              (_COMM_PAGE_BASE_ADDRESS+0x7a0) // memmove()
   
   #define _COMM_PAGE_COMPARE_AND_SWAP32B  (_COMM_PAGE_BASE_ADDRESS+0xf80) // compare-and-swap word w barrier
   #define _COMM_PAGE_COMPARE_AND_SWAP64B  (_COMM_PAGE_BASE_ADDRESS+0xfc0) // compare-and-swap doubleword w barrier
   
   #define _COMM_PAGE_MEMSET_PATTERN       (_COMM_PAGE_BASE_ADDRESS+0x1000)// used by nonzero memset()
   #define _COMM_PAGE_BIGCOPY                              (_COMM_PAGE_BASE_ADDRESS+0x1140)// very-long-operand copies
   
   #define _COMM_PAGE_END                                  (_COMM_PAGE_BASE_ADDRESS+0x1700)// end of commpage area
   
   #ifdef __ASSEMBLER__
   #ifdef __COMM_PAGE_SYMBOLS
   
   #define CREATE_COMM_PAGE_SYMBOL(symbol_name, symbol_address)            \
                                   .org    (symbol_address - _COMM_PAGE_BASE_ADDRESS) @\
   symbol_name: nop
   
           .text           // Required to make a well behaved symbol file
   
           CREATE_COMM_PAGE_SYMBOL(___compare_and_swap32, _COMM_PAGE_COMPARE_AND_SWAP32)
           CREATE_COMM_PAGE_SYMBOL(___compare_and_swap64, _COMM_PAGE_COMPARE_AND_SWAP64)
           CREATE_COMM_PAGE_SYMBOL(___atomic_enqueue, _COMM_PAGE_ENQUEUE)
           CREATE_COMM_PAGE_SYMBOL(___atomic_dequeue, _COMM_PAGE_DEQUEUE)
           CREATE_COMM_PAGE_SYMBOL(___memory_barrier, _COMM_PAGE_MEMORY_BARRIER)
           CREATE_COMM_PAGE_SYMBOL(___atomic_add32, _COMM_PAGE_ATOMIC_ADD32)
           CREATE_COMM_PAGE_SYMBOL(___atomic_add64, _COMM_PAGE_ATOMIC_ADD64)
           CREATE_COMM_PAGE_SYMBOL(___mach_absolute_time, _COMM_PAGE_ABSOLUTE_TIME)
           CREATE_COMM_PAGE_SYMBOL(___spin_lock_try, _COMM_PAGE_SPINLOCK_TRY)
           CREATE_COMM_PAGE_SYMBOL(___spin_lock, _COMM_PAGE_SPINLOCK_LOCK)
           CREATE_COMM_PAGE_SYMBOL(___spin_unlock, _COMM_PAGE_SPINLOCK_UNLOCK)
           CREATE_COMM_PAGE_SYMBOL(___pthread_getspecific, _COMM_PAGE_PTHREAD_GETSPECIFIC)
           CREATE_COMM_PAGE_SYMBOL(___gettimeofday, _COMM_PAGE_GETTIMEOFDAY)
           CREATE_COMM_PAGE_SYMBOL(___sys_dcache_flush, _COMM_PAGE_FLUSH_DCACHE)
           CREATE_COMM_PAGE_SYMBOL(___sys_icache_invalidate, _COMM_PAGE_FLUSH_ICACHE)
           CREATE_COMM_PAGE_SYMBOL(___pthread_self, _COMM_PAGE_PTHREAD_SELF)
           CREATE_COMM_PAGE_SYMBOL(___spin_lock_relinquish, _COMM_PAGE_RELINQUISH)
           CREATE_COMM_PAGE_SYMBOL(___bzero, _COMM_PAGE_BZERO)
           CREATE_COMM_PAGE_SYMBOL(___bcopy, _COMM_PAGE_BCOPY)
           CREATE_COMM_PAGE_SYMBOL(___memcpy, _COMM_PAGE_MEMCPY)
   //      CREATE_COMM_PAGE_SYMBOL(___memmove, _COMM_PAGE_MEMMOVE)
           CREATE_COMM_PAGE_SYMBOL(___compare_and_swap32b, _COMM_PAGE_COMPARE_AND_SWAP32B)
           CREATE_COMM_PAGE_SYMBOL(___compare_and_swap64b, _COMM_PAGE_COMPARE_AND_SWAP64B)
       CREATE_COMM_PAGE_SYMBOL(___memset_pattern, _COMM_PAGE_MEMSET_PATTERN)
           CREATE_COMM_PAGE_SYMBOL(___bigcopy, _COMM_PAGE_BIGCOPY)
           
           CREATE_COMM_PAGE_SYMBOL(___end_comm_page, _COMM_PAGE_END)
   
           .data           // Required to make a well behaved symbol file
           .long   0       // Required to make a well behaved symbol file
   
   #endif /* __COMM_PAGE_SYMBOLS */
   #endif /* __ASSEMBLER__ */
   
   #endif /* _PPC_CPU_CAPABILITIES_H */
   #endif /* PRIVATE */

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