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Intel microcode is microcode that runs inside x86 processors made by Intel. Since the P6 microarchitecture introduced in the mid-1990s, the microcode programs can be patched by the operating system or BIOS firmware to work around bugs found in the CPU after release. [ 1 ]
Microcode can be characterized as horizontal or vertical, referring primarily to whether each microinstruction controls CPU elements with little or no decoding (horizontal microcode) [a] or requires extensive decoding by combinatorial logic before doing so (vertical microcode). Consequently, each horizontal microinstruction is wider (contains ...
An obfuscated version of source code is displayed if the machine code is sent to a decompiler of the source language. The second condition requires the machine code to have information about the source code encoded within. The information includes a symbol table that contains debug symbols. The symbol table may be stored within the executable ...
In 2015, Microsoft released a microcode update for selected Sandy Bridge and Ivy Bridge CPUs for Windows 7 and up that addresses stability issues. However, the update negatively impacts Pentium G3258 and Core i3-4010U CPU models.
Intel promised microcode updates to resolve the vulnerability. [1] The microcode patches have been shown to significantly reduce the performance of some heavily-vectorized loads. [7] Patches to mitigate the effects of the vulnerability have also been created as part of the forthcoming version 6.5 release of the Linux kernel. [8]
Microcode could be developed using a DEC LSI-11 computer with the KUV11-AA Writable Control Store (WCS) option. This option allowed programming of the internal 8-bit micromachine to create application-specific extensions to the instruction set. The WCS is a quad Q-Bus board with a ribbon cable connecting to an open MCP-1600 microcode ROM socket ...
The MIC-1 is a CPU architecture invented by Andrew S. Tanenbaum to use as a simple but complete example in his teaching book Structured Computer Organization.. It consists of a very simple control unit that runs microcode from a 512-words store.
Check array index against bounds: raises software interrupt 5 if test fails ENTER: C8 iw ib: Enter stack frame: Modifies stack for entry to procedure for high level language. Takes two operands: the amount of storage to be allocated on the stack and the nesting level of the procedure. INSB/INSW: 6C Input from port to string.