ARM processor
^ OVERVIEW
This page for notes on ARM processor architecture, and related ARM IP works.
ARM Architecture and Instruction Set Notes
- http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0040d/Cabdcdci.html . . . ARM BX "branch and exchange" instruction (branch and change to thumb mode)
[ ] . . . search for Armv8-M Architecture Reference Manual ID28092022
^ Advanced Hardware Bus AHB
ARM architecture and related IP, link to AHB paper by Rinku 1, Pawan Kumar Dahiya 2
^ Synchronization Primitives LDREX and STREX
ARM Synchronization Primitives LDREX and STREX, split a normally atomic memory write operation and allow for checking whether other Processing Elements or "bus primaries" (note 1) are also accessing the given memory location. From the short documentations linked below, it looks like LDREX updates local and global resource access monitors in certain ARM variants, and STREX either succeeds or fails based on checking one or both of those monitors, depending on whether the memory or resource is shared or not shared among multiple processing elements (PEs).
Article locally numbered (3) in the following list of URLs introduces a comparative concept in its text "The Data Memory Barrier existed before ARMv7 as a cp15 operation, but ARMv7 introduced a dedicated instruction, DMB."
- (1) https://developer.arm.com/documentation/dht0008/a/ch01s02s01
- (2) https://developer.arm.com/documentation/dht0008/a/arm-synchronization-primitives/exclusive-accesses/exclusive-monitors
- (3) https://developer.arm.com/documentation/dht0008/a/arm-synchronization-primitives/exclusive-accesses/memory-barriers
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Tables redirects here; for information about database table structure, see Manual:Database layout.
Tables may be created in wiki pages. As a general rule, it is best to avoid using a table unless you need one. Table markup often complicates page editing.[1] Wiki table markup summary
| table header cell, optional. Consecutive table header cells may be added on same line separated by double marks ( | ) or start on new lines, each with its own single mark (!). | table data cell, optional. Consecutive table data cells may be added on same line separated by double marks ( | ). |
|---|
The above marks must start on a new line except the double || and !! for optionally adding consecutive cells to a line. However, blank spaces at the beginning of a line are ignored.
HTML attributes. Each mark, except table end, optionally accepts one or more HTML attributes. Attributes must be on the same line as the mark. Separate attributes from each other with a single space.
Cells and caption (| or ||, ! or !!, and |+) hold content. So separate any attributes from content with a single pipe (|). Cell content may follow on same line or on following lines.
Table and row marks ({| and |-) do not directly hold content. Do not add pipe (|) after their optional attributes. If you erroneously add a pipe after attributes for the table mark or row mark the parser will delete it and your final attribute if it was touching the erroneous pipe!
Content may (a) follow its cell mark on the same line after any optional HTML attributes or (b) on lines below the cell mark. Content that uses wiki markup that itself needs to start on a new line, such as lists, headings, or nested tables, must be on its own new line.
Pipe character as content. To insert a pipe (|) character into a table, use the <code>|</code> escaping markup.
Basics Create a table with editor toolbar
In wikitext editor, place the caret where you want to insert a table. Then, in the toolbar, press “Advanced”, then choose Table button. A dialog opens.
From the dialog, you can choose whether to enable a table header row, to stylize the table with border and to make the table sortable. A preview example is displayed. You can also set row and column counts you need. Then, press “Insert” button.
By default, the following code is generated: Wikicode:
| abbr ERG | Exclusive Reservation Granuale, refers to smallest memory regions which Exclusive Monitors are able to tag for exclusive access |
| abbr SCU | Snoop Control Unit |
