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author | Joel Sherrill <joel.sherrill@OARcorp.com> | 1998-11-23 22:09:47 +0000 |
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committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 1998-11-23 22:09:47 +0000 |
commit | f48b100053888860f4d4545dd8aca37eb3164f1a (patch) | |
tree | a7df7b2f916baf683590f349894a8b4bc0f450d9 /doc/supplements/mips64orion/memmodel.t | |
parent | New files added as part of file system infrastructure effort. (diff) | |
download | rtems-f48b100053888860f4d4545dd8aca37eb3164f1a.tar.bz2 |
New files copied from template and personalized.
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diff --git a/doc/supplements/mips64orion/memmodel.t b/doc/supplements/mips64orion/memmodel.t new file mode 100644 index 0000000000..4cb46bab90 --- /dev/null +++ b/doc/supplements/mips64orion/memmodel.t @@ -0,0 +1,39 @@ +@c +@c COPYRIGHT (c) 1988-1998. +@c On-Line Applications Research Corporation (OAR). +@c All rights reserved. +@c +@c $Id$ +@c + +@chapter Memory Model + +@section Introduction + +A processor may support any combination of memory +models ranging from pure physical addressing to complex demand +paged virtual memory systems. RTEMS supports a flat memory +model which ranges contiguously over the processor's allowable +address space. RTEMS does not support segmentation or virtual +memory of any kind. The appropriate memory model for RTEMS +provided by the targeted processor and related characteristics +of that model are described in this chapter. + +@section Flat Memory Model + +The XXX family supports a flat 32-bit address +space with addresses ranging from 0x00000000 to 0xFFFFFFFF (4 +gigabytes). Each address is represented by a 32-bit value and +is byte addressable. The address may be used to reference a +single byte, word (2-bytes), or long word (4 bytes). Memory +accesses within this address space are performed in big endian +fashion by the processors in this family. + +Some of the XXX family members such as the +XXX, XXX, and XXX support virtual memory and +segmentation. The XXX requires external hardware support +such as the XXX Paged Memory Management Unit coprocessor +which is typically used to perform address translations for +these systems. RTEMS does not support virtual memory or +segmentation on any of the XXX family members. + |