X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/43866e378188c25dd1e2208016ab3cbeb086ae6c..55e303ae13a4cf49d70f2294092726f2fffb9ef2:/osfmk/ppc/cpu_capabilities.h diff --git a/osfmk/ppc/cpu_capabilities.h b/osfmk/ppc/cpu_capabilities.h index 2b43b9da4..d142b9086 100644 --- a/osfmk/ppc/cpu_capabilities.h +++ b/osfmk/ppc/cpu_capabilities.h @@ -81,5 +81,115 @@ extern int _cpu_capabilities; 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 + +/* 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 1 // this is version 1 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+0x030) // 16 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_UNUSED2 (_COMM_PAGE_BASE_ADDRESS+0x050) // 16 unused bytes + +#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() + +#define _COMM_PAGE_UNUSED3 (_COMM_PAGE_BASE_ADDRESS+0x080) // 384 unused bytes + + /* 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_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_UNUSED6 (_COMM_PAGE_BASE_ADDRESS+0xF80) // 128 unused bytes + +#define _COMM_PAGE_BIGCOPY (_COMM_PAGE_BASE_ADDRESS+0x1000)// very-long-operand copies + +#define _COMM_PAGE_END (_COMM_PAGE_BASE_ADDRESS+0x1600)// end of common page + +#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(___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(___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 /* __APPLE_API_PRIVATE */ #endif /* _PPC_CPU_CAPABILITIES_H */