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Zynq-Linux移植学习笔记之45-linux下访问物理地址时间优化

1、背景介绍在zynq上运行linux程序时,有时候会需要arm去axi总线上挂载的IP核的某个寄存器去取值。最简单的方法就是使用devmem进行虚实地址转换,然后直接访问IP核该寄存器的物理地址。一般情况下如果只是读一两次寄存器这种操作耗时可以接受,但在面对fifo这种需要长时间读取的情况,这种每次都需要转换的耗时就很明显了。在之前的博客中记录过类似的优化方法(虚实地址转换建议),这里再做点补充。2、优化前代码优化之前代码很简单,比如下面GetGpioReg/SetGpioReg,里面都.

2020-10-31 20:47:25

C. Dominant Piranha

time limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputThere arennpiranhas with sizesa1,a2,…,ana1,a2,…,anin the aquarium. Piranhas are numbered from left to right in order they live in the ...

2020-10-26 20:34:04

B. Yet Another Bookshelf

time limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputThere is a bookshelf which can fitnnbooks. Theii-th position of bookshelf isai=1ai=1if there is a book on this position andai=0ai=0o...

2020-10-26 20:02:21

A. Boring Apartments

time limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputThere is a building consisting of1000010000apartments numbered from11to1000010000, inclusive.Call an apartmentboring, if its nu...

2020-10-26 19:52:04

A1. Prefix Flip (Easy Version)

time limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputThis is the easy version of the problem. The difference between the versions is the constraint onnnand the required number of operations...

2020-10-08 21:49:39

B. Array Cancellation

time limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputYou're given an arrayaaofnnintegers, such thata1+a2+⋯+an=0a1+a2+⋯+an=0.In one operation, you can choose twodifferentindicesiiand...

2020-10-08 21:40:07

2020-10-08

time limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputAshishgup and FastestFinger play a game.They start with a numbernnand play in turns. In each turn, a player can makeany oneof the fo...

2020-10-08 21:25:21

A. Ahahahahahahahaha

time limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputAlexandra has an even-length arrayaa, consisting of00s and11s. The elements of the array are enumerated from11tonn. She wants to remo...

2020-10-08 21:13:38

A. Three Indices

time limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputYou are given a permutationp1,p2,…,pnp1,p2,…,pn. Recall that sequence ofnnintegers is called apermutationif it contains all integers ...

2020-10-08 21:06:23

C. Mere Array

time limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputYou are given an arraya1,a2,…,ana1,a2,…,anwhere allaiaiare integers and greater than00.In one operation, you can choose two differe...

2020-10-08 20:35:37

C. Yet Another Array Restoration

time limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputWe have a secret array. You don't know this array and you have to restore it. However, you know some facts about this array:The array con

2020-10-08 20:26:19

A. Cubes Sorting

time limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputFor god's sake, you're boxes with legs! It is literally your only purpose! Walking onto buttons! How can you not do the one thing you were de

2020-10-08 20:14:06

linux下根据槽位号自动配置IP地址shell脚本【第二版】

板卡上面有7个网卡,默认规则为槽位号*10+插箱号作为网卡IP地址的最后一个字段,在配置时同时将槽位号和插箱号作为板卡的hostname以示区分。脚本中如果板卡所在的槽位和插箱和原有配置的一样就无须配置,否则重新进行配置。#!/bin/bashvpx_eth_name=("enp2s0f0" "enp2s0f1" "enp7s0" "enp9s0f0" "enp9s0f1" "enp9s0f2" "enp9s0f3")net_vpx_autocfg(){ echo "vpx_net_aut

2020-10-07 17:50:40

A. Floor Number

time limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputVasya goes to visit his classmate Petya. Vasya knows that Petya's apartment number isnn.There is only one entrance in Petya's house and .

2020-10-04 16:32:30

C. A Cookie for You

time limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputAnna is a girl so brave that she is loved by everyone in the city and citizens love her cookies. She is planning to hold a party with cooki

2020-09-21 21:31:03

A. Subset Mex

time limit per test1 secondmemory limit per test512 megabytesinputstandard inputoutputstandard outputGiven a set of integers (it can contain equal elements).You have to split it into two subsetsAAandBB(both of them can contain equal e...

2020-09-21 21:21:27

A. Sign Flipping

time limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputYou are givennnintegersa1,a2,…,ana1,a2,…,an, wherennis odd. You are allowed to flip the sign of some (possibly all or none) of them. Y...

2020-09-21 20:59:34

B. Omkar and Infinity Clock

time limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputBeing stuck at home, Ray became extremely bored. To pass time, he asks Lord Omkar to use his time bending power: Infinity Clock! However,

2020-09-21 20:53:01

A. Omkar and Password

time limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputLord Omkar has permitted you to enter the Holy Church of Omkar! To test your worthiness, Omkar gives you a password which you must interpr

2020-09-13 21:53:07

B. Ternary Sequence

time limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputYou are given two sequencesa1,a2,…,ana1,a2,…,anandb1,b2,…,bnb1,b2,…,bn. Each element of both sequences is either00,11or22. The numb...

2020-09-13 21:45:01

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