Google Chrome OS is a controversial project. Some people think that its concept is too advanced, while others think that it cannot succeed at all. It is based on a Linux system, but has abandoned thousands of open-source software. It sticks to the "browser as the operating system" and focuses on network applications. In addition, to run Chrome OS smoothly, you must use dedicated hardware chromebook or chromebox, which also limits its development. Ther
How many registers does the ARM processor contain? What registers are available in each mode? What are the functions of these registers? Let's learn about arm registers with these questions! I believe you will gain some benefits after reading this article.The ARM processor has 37 registers.It contains 31 General registers and 6 State registers.
========================================================== ========================================================== ========USR System Supervisor abort
In the process of Elliptic curve operation, the results of 256-bit addition and subtraction are often outside the interval [0,p], and the operation of +p or-p is required. The 256-bit NIST domain Elliptic curve parameter p is generated in the following formula: p = 2^256?2^224 + 2^192 + 2^96? 1 The formula is broken down by the symbol: p = (2^256 + 2^192 + 2^96)-(2^224 + 1) Convert to 16 and press the 64-bit section to change to the following form: +: 0000000000000001 0000000000000000 0000000100
interrupt for the CORTEX-M3 hardware also uses the MSP pointer. After enabling the interrupt, use the assembly instruction Svc 0 to trigger the SVC interrupt and complete the task of starting the first one. Let's take a look at the SVC Interrupt Service function:__asm void Vportsvchandler (void) { PRESERVE8 LDR R3, =PXCURRENTTCB/ * PXCURRENTTCB point to the highest-priority readiness task TCB */ LDR R1, [R3]/ * Gets the task TCB address */ LDR r0, [R1]/ * Ge
register (R15) while CPU is runningJlink Error:can not read register (XPSR) while CPU is runningJlink error:can Not read register 0 (R0) while CPU is runningJlink Error:can Not read Register 1 (R1) while CPU is runningJlink Error:can Not read Register 2 (R2) while CPU is runningJlink Error:can Not read Register 3 (R3) while CPU is runningJlink Error:can Not read Register 4 (R4) while CPU is runningJlink Error:can Not read Register 5 (R5) while CPU is runningJlink Error:can Not read register 6 (
wrong). Let's take two-dimensional space for example. is a picture in the Guttman paper:Let me explain this picture in more detail. Take a look at figure (b) First, we assume that all data is a point in a two-dimensional space, and the figure only marks the data in the R8 region, that is, the shape of the object. Don't take that piece of irregular graph as a data, we think of it as a region of multiple data. To implement the R-tree structure, we use a minimum bounding rectangle to precisely fra
Using the aura window manager and packaging applications, Google is changing the impression of Chrome OS. Today, it can operate windows like a desktop system and has offline applications. However, to run Chrome OS, you must purchase chromebook. Does this limit the development of Chrome OS?
Not necessarily. Because the software platform of Chrome OS is Chrome browser. As long as you use the Chrome browser, you can use the chrome application. Therefor
video card fully guarantee the system's smoothness. It is worth mentioning that the Horizon 2 screen can also be a 180° flip, very adaptable to a variety of usage scenarios, and Lenovo's unique aura interface makes it easier to share and entertain more people.
Lenovo Yoga 2 Pro
As a representative of the second generation of the series, Yoga 2 Pro not only follows the unique design of the Yoga family's iconic 360° hinge, but also has a significant improvement in hardware compare
hard drive, but for the average user has been able to accept. In addition, there are some very good new technologies that have been applied to solid-state drives in 2014, such as m.2 PCIe solid-state drives and Samsung's high-speed 3D V-nand technology. If you're worried about the longevity of a solid-state drive, it's completely unnecessary. Because a new study shows that the lifespan of a solid-state drive is not necessarily a concern.
If you really want to upgrade your computer, it's wise t
In the history of PC development, the netbook is obviously not a successful product: The narrow screen, the slow processor, the expensive price, finally by the user's dislike, disappears from the historical stage. However, PC manufacturers did not give up the introduction of Low-cost notebooks, such as Google's Chromebook, its product form and the netbook is very similar to the main push of the use of simple experience, prices generally less than 2000
produced the illusion, with the mouse and keyboard to control SBX let people really think its positioning is very vague.5. HP Slatebook 14If Chromebooks is supposed to being lightweight, cheap laptops using a lightweight OS, then HP went one better by equipping Its slatebook with Android. But it's not better than getting a Chromebook or a a long shot. It's a nice piece of hardware, with solid battery life and a comfy keyboard. However, lots of laptop
byte in the state. It can be mapped through the calculated S box.Schange:Ldi zh, $01; point the pointer to the first address of the S boxMoV ZL, R2; the data to be searched as the pointer's low addressLdtemp, Z +; obtain the corresponding dataMoV R2, temp; complete data query...RET
② Shiftrow is a byte transposition. It cyclically shifts the rows in the status according to different offsets, and this offset is also selected based on different NB [3].Shiftrow:; this is a subprogram for byte tran
:
/* Because the following C function requires an SP */
LDR sp, = 4096
@ Disable Watchdog
LDR r0, = 0x53000000
MoV R1, #0
STR R1, [R0]
@ Init SDRAM
BL memsetup
@ Brief the code to SDRAM
BL cp_to_sdram
@ Setup pagetable
BL creat_page_table
@ Init and enable MMU
BL mmu_init
@ Reset stack MMU is enabled. We need to reset the next stack pointer to point to the top of the virtual address ing.
LDR sp, = 0xb4000000
@ Jump to the virtual address
/* These two commands are ba
, debug_reloc_end;2) Use R0, R7, R8 respectively to save the values of R0, R1, R2 (respectively, 0, Machinetype, atag pointers), R9 is the value of CPSR;3) R2 save CPSR, determine whether the last 2bit is 0, that is, whether the user mode, not the case is set to the SVC mode, and the R9 in the cpsr saved to SPSR;4) Put the final kernel file address in the R4, one way is through the pc0xf8000000 + text_offset; one way is Zreladdr;text_offset =??ZRELADDR is defined in makefile, but the context is
(1) Additional questionsWrite assembler to add 8 times R4~r11, R4~r11 start value is 1~8, after each false operation put R4~R11 content into SP Stack, SP's initial set to 0x800.(2) Problem analysisFirst, the RI is added by adding to the add value.The data is then pressed into the stack by Stmia, with a count record of the number of operations, the loop ending com
of the function.
On the x86_64 platform, the parameters of Linux are passed through the following 9 registers, respectively: Rdi,rsi,rdx,rcx,rax,r8,r9,r10,r11. In the Pre_handler function, we can get the Register group variable, through the Register group variable, we can get the second parameter value passed by the Create_empty_buffers function through the RSI register. For the Linux-2.6.23 version, the registers in the function call process are de
Recently, chromebook has arrived. Lu Bin, the android leader, has been transferred. The owner of Chrome browser is the owner. Chromebook has been suspended for two or three years. The last chromeos was launched using WebKit as the shell, which proved to be ineffective. In the past two or three years, more voices have been heard: chromeos will be abandoned, and Android should be more unified. According to my
The latest Chrome OS Dev adds two new features, starting with a touch-input virtual keyboard. Although Chromebook Pixel has a touch screen, it can only click on the button in the Web page, and now it is also able to enter characters directly. Of course, it's really strange for someone with a keyboard on the shelf without the need to poke around on the screen, is this supposed to be for the future tablet chrome pad?
The latest Chrome OS Dev adds two
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.