diff options
author | Joel Sherrill <joel.sherrill@OARcorp.com> | 2006-08-23 19:11:14 +0000 |
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committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 2006-08-23 19:11:14 +0000 |
commit | 83fb86f32b73942be758c22423c0bfe506fd4ff6 (patch) | |
tree | d51a136781eaccf67bfb2addfbe5330d9aed4791 /doc/supplements/i386/memmodel.t | |
parent | 2006-08-23 Joel Sherrill <joel@OARcorp.com> (diff) | |
download | rtems-83fb86f32b73942be758c22423c0bfe506fd4ff6.tar.bz2 |
2006-08-23 Joel Sherrill <joel@OARcorp.com>
* Makefile.am, configure.ac, FAQ/stamp-vti, FAQ/version.texi,
common/cpright.texi: Merging CPU Supplements into a single document.
As part of this removed the obsolete and impossible to maintain size
and timing information.
* cpu_supplement/.cvsignore, cpu_supplement/Makefile.am,
cpu_supplement/arm.t, cpu_supplement/i386.t, cpu_supplement/m68k.t,
cpu_supplement/mips.t, cpu_supplement/powerpc.t,
cpu_supplement/preface.texi, cpu_supplement/sh.t,
cpu_supplement/sparc.t, cpu_supplement/tic4x.t: New files.
* supplements/.cvsignore, supplements/Makefile.am,
supplements/supplement.am, supplements/arm/.cvsignore,
supplements/arm/BSP_TIMES, supplements/arm/ChangeLog,
supplements/arm/Makefile.am, supplements/arm/arm.texi,
supplements/arm/bsp.t, supplements/arm/callconv.t,
supplements/arm/cpumodel.t, supplements/arm/cputable.t,
supplements/arm/fatalerr.t, supplements/arm/intr_NOTIMES.t,
supplements/arm/memmodel.t, supplements/arm/preface.texi,
supplements/arm/timeBSP.t, supplements/c4x/.cvsignore,
supplements/c4x/BSP_TIMES, supplements/c4x/ChangeLog,
supplements/c4x/Makefile.am, supplements/c4x/bsp.t,
supplements/c4x/c4x.texi, supplements/c4x/callconv.t,
supplements/c4x/cpumodel.t, supplements/c4x/cputable.t,
supplements/c4x/fatalerr.t, supplements/c4x/intr_NOTIMES.t,
supplements/c4x/memmodel.t, supplements/c4x/preface.texi,
supplements/c4x/timeBSP.t, supplements/i386/.cvsignore,
supplements/i386/ChangeLog, supplements/i386/FORCE386_TIMES,
supplements/i386/Makefile.am, supplements/i386/bsp.t,
supplements/i386/callconv.t, supplements/i386/cpumodel.t,
supplements/i386/cputable.t, supplements/i386/fatalerr.t,
supplements/i386/i386.texi, supplements/i386/intr_NOTIMES.t,
supplements/i386/memmodel.t, supplements/i386/preface.texi,
supplements/i386/timeFORCE386.t, supplements/m68k/.cvsignore,
supplements/m68k/ChangeLog, supplements/m68k/MVME136_TIMES,
supplements/m68k/Makefile.am, supplements/m68k/bsp.t,
supplements/m68k/callconv.t, supplements/m68k/cpumodel.t,
supplements/m68k/cputable.t, supplements/m68k/fatalerr.t,
supplements/m68k/intr_NOTIMES.t, supplements/m68k/m68k.texi,
supplements/m68k/memmodel.t, supplements/m68k/preface.texi,
supplements/m68k/timeMVME136.t, supplements/m68k/timedata.t,
supplements/mips/.cvsignore, supplements/mips/BSP_TIMES,
supplements/mips/ChangeLog, supplements/mips/Makefile.am,
supplements/mips/bsp.t, supplements/mips/callconv.t,
supplements/mips/cpumodel.t, supplements/mips/cputable.t,
supplements/mips/fatalerr.t, supplements/mips/intr_NOTIMES.t,
supplements/mips/memmodel.t, supplements/mips/mips.texi,
supplements/mips/preface.texi, supplements/mips/timeBSP.t,
supplements/powerpc/.cvsignore, supplements/powerpc/ChangeLog,
supplements/powerpc/DMV177_TIMES, supplements/powerpc/Makefile.am,
supplements/powerpc/PSIM_TIMES, supplements/powerpc/bsp.t,
supplements/powerpc/callconv.t, supplements/powerpc/cpumodel.t,
supplements/powerpc/cputable.t, supplements/powerpc/fatalerr.t,
supplements/powerpc/intr_NOTIMES.t, supplements/powerpc/memmodel.t,
supplements/powerpc/powerpc.texi, supplements/powerpc/preface.texi,
supplements/powerpc/timeDMV177.t, supplements/powerpc/timePSIM.t,
supplements/sh/.cvsignore, supplements/sh/BSP_TIMES,
supplements/sh/ChangeLog, supplements/sh/Makefile.am,
supplements/sh/bsp.t, supplements/sh/callconv.t,
supplements/sh/cpumodel.t, supplements/sh/cputable.t,
supplements/sh/fatalerr.t, supplements/sh/intr_NOTIMES.t,
supplements/sh/memmodel.t, supplements/sh/preface.texi,
supplements/sh/sh.texi, supplements/sh/timeBSP.t,
supplements/sparc/.cvsignore, supplements/sparc/ChangeLog,
supplements/sparc/ERC32_TIMES, supplements/sparc/Makefile.am,
supplements/sparc/bsp.t, supplements/sparc/callconv.t,
supplements/sparc/cpumodel.t, supplements/sparc/cputable.t,
supplements/sparc/fatalerr.t, supplements/sparc/intr_NOTIMES.t,
supplements/sparc/memmodel.t, supplements/sparc/preface.texi,
supplements/sparc/sparc.texi, supplements/sparc/timeERC32.t,
supplements/template/.cvsignore, supplements/template/BSP_TIMES,
supplements/template/ChangeLog, supplements/template/Makefile.am,
supplements/template/bsp.t, supplements/template/callconv.t,
supplements/template/cpumodel.t, supplements/template/cputable.t,
supplements/template/fatalerr.t, supplements/template/intr_NOTIMES.t,
supplements/template/memmodel.t, supplements/template/preface.texi,
supplements/template/template.texi, supplements/template/timeBSP.t: Removed.
Diffstat (limited to 'doc/supplements/i386/memmodel.t')
-rw-r--r-- | doc/supplements/i386/memmodel.t | 72 |
1 files changed, 0 insertions, 72 deletions
diff --git a/doc/supplements/i386/memmodel.t b/doc/supplements/i386/memmodel.t deleted file mode 100644 index 4ed5c53b7c..0000000000 --- a/doc/supplements/i386/memmodel.t +++ /dev/null @@ -1,72 +0,0 @@ -@c -@c COPYRIGHT (c) 1988-2002. -@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 - -RTEMS supports the i386 protected mode, flat memory -model with paging disabled. In this mode, the i386 -automatically converts every address from a logical to a -physical address each time it is used. The i386 uses -information provided in the segment registers and the Global -Descriptor Table to convert these addresses. RTEMS assumes the -existence of the following segments: - -@itemize @bullet -@item a single code segment at protection level (0) which -contains all application and executive code. - -@item a single data segment at protection level zero (0) which -contains all application and executive data. -@end itemize - -The i386 segment registers and associated selectors -must be initialized when the initialize_executive directive is -invoked. RTEMS treats the segment registers as system registers -and does not modify or context switch them. - -This i386 memory model 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, half-word (2-bytes), or word (4 bytes). - -RTEMS does not require that logical addresses map -directly to physical addresses, although it is desirable in many -applications to do so. If logical and physical addresses are -not the same, then an additional selector will be required so -RTEMS can access the Interrupt Descriptor Table to install -interrupt service routines. The selector number of this segment -is provided to RTEMS in the CPU Dependent Information Table. - -By not requiring that logical addresses map directly -to physical addresses, the memory space of an RTEMS application -can be separated from that of a ROM monitor. For example, on -the Force Computers CPU386, the ROM monitor loads application -programs into a logical address space where logical address -0x00000000 corresponds to physical address 0x0002000. On this -board, RTEMS and the application use virtual addresses which do -not map to physical addresses. - -RTEMS assumes that the DS and ES registers contain -the selector for the single data segment when a directive is -invoked. This assumption is especially important when -developing interrupt service routines. - |