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A presentation at the Linux Plumbers Conference on September 7, 2011, covered the x32 ABI. [2] The x32 ABI was merged into the Linux kernel for the 3.4 release with support being added to the GNU C Library in version 2.16. [14] In December 2018 there was discussion as to whether to deprecate the x32 ABI, which has not happened as of April 2023 ...
An eight-bit processor like the Intel 8008 addresses eight bits, but as this is the full width of the accumulator and other registers, this could be considered either byte-addressable or word-addressable. 32-bit x86 processors, which address memory in 8-bit units but have 32-bit general-purpose registers and can operate on 32-bit items with a ...
The primary defining characteristic of IA-32 is the availability of 32-bit general-purpose processor registers (for example, EAX and EBX), 32-bit integer arithmetic and logical operations, 32-bit offsets within a segment in protected mode, and the translation of segmented addresses to 32-bit linear addresses. The designers took the opportunity ...
For instance, a computer said to be "32-bit" also usually allows 32-bit memory addresses; a byte-addressable 32-bit computer can address 2 32 = 4,294,967,296 bytes of memory, or 4 gibibytes (GiB). This allows one memory address to be efficiently stored in one word.
The default OperandSize and AddressSize to use for each instruction is given by the D bit of the segment descriptor of the current code segment - D=0 makes both 16-bit, D=1 makes both 32-bit. Additionally, they can be overridden on a per-instruction basis with two new instruction prefixes that were introduced in the 80386:
The 68000 has a 24-bit external address bus and two byte-select signals "replaced" A0. These 24 lines can therefore address 16 MB of physical memory with byte resolution. Address storage and computation uses 32 bits internally; however, the 8 high-order address bits are ignored due to the physical lack of device pins.
A 32-entry fully associative translation lookaside buffer (TLB) is used to translate virtual addresses into physical addresses. [10] This TLB is referred to as the data translation buffer (DTB). The 21064 implemented a 43-bit virtual address and a 34-bit physical address, and is therefore capable of addressing 8 TB of virtual memory and 16 GB ...
In PMBus, blocks may include up to 255 bytes (vs. the 32-byte limit of SMbus). As in SMBus 2.0, only seven-bit addressing is used. Some commands use the SMBus 2.0 block process calls. Either the SMBALERT# mechanism or the SMBus 2.0 host notify protocol may be used to notify the host about faults.