Spinlock implementation in ARM architecture   SEV and WFE are the main instructions used for implementing spinlock in case of ARM architecture. Let's look briefly at those two instructions before looking into actual spinlock implementation. SEV SEV c…

http://en.wikipedia.org/wiki/ARM_architecture ARM architecture     ARM architectures The ARM logo Designer ARM Holdings Bits 32-bit or 64-bit Introduced 1985 Design RISC Type Register-Register Branching Condition code Open Proprietary 64/32-bit archi…

https://gitorious.org/freebsd/freebsd/raw/56c5165837bf08f50ca4a08c6b2da91f73852960:sys/arm/include/acle-compat.h /* * Copyright (c) 2014 ARM Ltd * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modificat…

src: https://wiki.edubuntu.org/ARM/Thumb2PortingHowto#ARM_Assembler_Overview When you see some assembler in a source package, there are some things which you need to consider when porting for Thumb-2 compatibility. This page aims to highlight the mai…

ref:http://kmittal82.wordpress.com/2012/02/17/armthumbthumb-2/ A few months ago I gave a presentation titled “Introduction to the ARM architecture”. One of the most well received sections of that was a bit where I explained the difference between the…

iOS Assembly Tutorial: Understanding ARM Do you speak assembly? When you write Objective-C code, it eventually turns into machine code – the raw 1s and 0s that the ARM CPU understands. In between machine code and machine code, though, is the still hu…

墙外通道:https://genode.org/documentation/articles/trustzone ARM TrustZone technology has been around for almost a decade. It was introduced at a time when the controversial discussion about trusted platform-modules (TPM) on x86 platforms was in full swi…

http://en.wikipedia.org/wiki/Advanced_RISC_Machines ARM Holdings  (Redirected from Advanced RISC Machines)   ARM Holdings plc Type Public limited company Traded as LSE: ARM   NASDAQ: ARMH   Industry Semiconductors Founded 1990 (Cambridge) Founder(s)…

本文转载至:http://www.wowotech.net/armv8a_arch/wfe_wfi.html 1. 前言 蜗蜗很早以前就知道有WFI和WFE这两个指令存在,但一直似懂非懂.最近准备研究CPU idle framework,由于WFI是让CPU进入idle状态的一种方法,就下决心把它们弄清楚. WFI(Wait for interrupt)和WFE(Wait for event)是两个让ARM核进入low-power standby模式的指令,由ARM architecture定义…

来自:<DDI0406C_C_arm_architecture_reference_manual.pdf>p2723 能够查询到:“RAZ RAO WI 等的意思” RAZ:Read-As-Zero 读到的总是0 RAO:Read-As-Oned读到的总是1 WI :Writes Ignoredx 写无效 SBZP:Should-Be-Zero-or-Preserved on writes 写总是0 SBOP : Should-Be-One-or-Preserved on writes. 写总…