alienware r4

From the Internet found a neon command optimization yuv420 to rgb24 code, in the cortex-A8 architecture, clock speed 1g CPU for a frame of qcif (176x144) data test, in addition, compared with the popular algorithm written in C on the Internet, it is found that the speed of the former is more than 700 times that of the latter: the former uses 1000 ms for 112 cycles, and the latter uses 88645 Ms. The related code is as follows: Assembly Code Area |. text |, code, readonly; name this block of code

[Lab environment] The C3640-IK9O3S-M Version 12.4 (10) [PURPOSE] BGP Confederation is used to solve the BGP Route black hole problem caused by horizontal segmentation of IBGP. [Experiment topology] [Experiment description] R1, R2, R4, and R5 run the BGP protocol, while R2, R3, and R4 run the OSPF protocol. The objective is to make 1.1.1.1 The IBGP neighbor relationship is established using the loopback in

First: Basic knowledge (1) Register, use rules for parameter passing A. In the subroutine, use the register R4 ~ R11 to save local variables. B. Register R12 is used for Scratch registers between subprograms (used to save the SP and use this register to exit the register when the function returns) and is recorded as IP addresses. C. Register R13 is used as the data stack pointer and recorded as sp. The SP value in the register must be the same as that

1. Topology Map: 2. Interface configuration: R1 (config) #int f0/0 R1 (config-if) #ip add 10.1.1.11 255.255.255.0 R1 (config-if) #no sh R2 (config) #int f0/0 R2 (config-if) #ip add 10.1.1.12 255.255.255.0 R2 (config-if) #no sh R3#vlan Database R3 (VLAN) #vlan 10 VLAN Ten added: name:vlan0010 R3 (VLAN) #exit APPLY completed. Exiting ..... R3 (config) #int f0/0 R3 (config-if) #switchport mode access R3 (config-if) #switchport Access VLAN 10 R3 (config-if) #int F0/15 R3 (config

1. explore the election process 1.1 experiment topology 1.2 experiment requirements (1) configure the basic IP address based on the topology (2) Capture packets on the shared link and pay attention to the Hello message during OSPF neighbor relationship establishment (3) debug the OSPF joining relationship on R1, R2, R3, and R4 (4) sequentially declare the direct connection network of R1, R2, R3, and R4 to t

R3 R3 (config) # int ser 0/1 // interface connected to the county-level Router R3 (config-if) # ip add 192.168.5.1 255.255.255.0 R3 (config-if) # no shut R3 (config-if) # ip add 192.168.5.2 255.255.255.0 R3 (config-if) # int ser 0/0 // interface connected to internal Ethernet R3 (config-if) # ip add 192.168.3.1 255.255.255.0 R3 (config-if) # no shut R4 Router # config t Router (config) # line con 0 Router (config-line) # logg sy Router (c

MPLS + BGP advanced featuresWill LDP allocate tags for BGP routes? Why? --- Previously we mentioned that LDP assigns tags to IGP and never assigns tags to BGP. the following uses an experiment to illustrate how LDP + BGP works. forwarding method of a pure IP Network: In this topology, R1 and R4 establish an EBGP neighbor. r3 and R5 establish EBGP neighbors. build an IBGP neighbor between R1 and R3. IGP protocol between R1-R2-R3 is OSPF. network 44.1.1

Information location: http://www.china-ccie.com/ccie/lilun/igp/igp.htmlThrough the analysis can be learned that the reason for the suboptimal path is: (OSPF ad value is less than RIP) (in fact, the use of two-way redistribution, resulting in a more complex network, the generation of suboptimal path, this thing really no other way to use.) ）Since router R1 in the RIP Zone distributes the external route 100.1.1.0 into the RIP, R2 again distributes 100.1.1.0 into the OSPF area, routing to

Implementation Analysis of osctxsw Based on ARM920T: First, you must understand that when porting uCOS-II to ARM920T, the following structure of the task stack is used: Program list: Based onARM920TOfOsctxswImplementation AnalysisNote:ArmSave manuallyPCAndPsw Osctxsw; Special optimised code below:1. Press the stack separately based on the task stack structure to save the site of the old taskStmf

of the stack canary is damaged, the kernel will directly act as the machine. So how can we determine that the stack canary is overwritten? In fact, this is done by GCC. The kernel adds the-fstack-Protector parameter to GCC during compilation. */ Define (tsk_stack_canary, offsetof (struct task_struct, stack_canary )); // Task_struct Define (ti_task, offsetof (struct thread_info, task )); // /* * Domain types */ /* # Define domain_noaccess 0 # Define domain_client 1 // is the user's domain (Execu

Canary when the value is destroyed. The kernel will be directly on the machine. So how do you infer that the stack canary is covered?In fact, this was done by GCC, which added a-fstack-protector parameter to GCC when it was compiled.*/DEFINE (Tsk_stack_canary, offsetof (struct task_struct,stack_canary));Task_structDEFINE (Ti_task, offsetof (struct thread_info, TASK));///* * Domain types*//*#define DOMAIN_NOACCESS 0#define Domain_client 1// is the user's domain (running programs, access data), a

system mode, are called exception modes. 5.2. Register usage rules The subroutine passes the parameter [2] between the registers through the register R0-R3. At this time, register R0-R3 can be recorded as A1-A4. The invoked subroutine does not need to recover the contents of the register R0-R3 before returning. If the number of arguments is more than 4, the remaining Word data is passed through the data stack. Our Hello world! example is to pass the standard output file description, the string

data frame, and then check the MAC Address table to get out of the corresponding interface.IP address is effective throughout the network, the entire Internet network is the equivalent of a large map, also know how to get all the IP address, then in the transmission of the source IP and destination IP will not change. When the router receives the packet, check the destination IP address of the packet, then look for the routing table (routing forwarding) and choose the appropriate interface to s

4 bytes from the R1 address to the D0~D3,R1 address increment, and then deposit the data in the D0~D3 to the R0 address, while the r0 also increases. Now it's time to go back and look at the last byte of the D0~D3 register, respectively, 64,65,61,64. To "dead". So the current R1 is added after the address. An error occurred while attempting to write data to an invalid address 0xddeeaadd at R0.and displays an error address of 0xddeeaadd. Objdump, come here and mention the part of Objdump. You ca

targetresetinit; Basic initialization of the target boardB _ main; jump to the C language portalWho knows the specific content of the _ main () function?If I do not need to call the library function, can I change it to B Main?A: Check that the compilation Code contains _ main (). The components are related to some link options.Yes. But the global variable cannot be initialized. 68th Q:Q: I have embedded such a statement in C._ ASM{Mrs R4, CPSR;Stmfd

/themes/default/images/spacer.gif "style =" Background: URL ("/e/u261/lang/ZH-CN/images/localimage.png") No-repeat center; Border: 1px solid # DDD; "alt =" spacer.gif "/> Analysis of experimental phenomena: 650) This. width = 650; "src ="/e/u261/themes/default/images/spacer.gif "style =" Background: URL ("/e/u261/lang/ZH-CN/images/localimage.png") No-repeat center; Border: 1px solid # DDD; "alt =" spacer.gif "/> View the R4 route table: 650) This. wid

Restores the value of lr_irq from the stack so that it can be used by a subs instruction Return to the correct address after the interrupt has been handled. Example 5-13 on page 5-25 shows how this works. The top level interrupt handler readsThe value of a memory-mapped interrupt controller base address at 0x80000000. If Value of the address is 1, the top-level handler branches to a handler written in C. Handling processor exceptions Arm DUI 0056d copyright 1999-2001 arm limited. All Rights Res