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2011-11-28 Werner Almesberger <werner@almesberger.net>

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PR 1956/cpukit
	* rtems/score/cpu.h: Correct multiple alignment constants. Improve
	comments.
This commit is contained in:
Joel Sherrill
2011-11-28 17:36:35 +00:00
parent e5a80202a8
commit 7e8ed4defc
2 changed files with 17 additions and 24 deletions
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6
cpukit/score/cpu/lm32/ChangeLog
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@@ -1,3 +1,9 @@
2011-11-28 Werner Almesberger <werner@almesberger.net>
PR 1956/cpukit
* rtems/score/cpu.h: Correct multiple alignment constants. Improve
comments.
2011-11-09 Werner Almesberger <werner@almesberger.net> 2011-11-09 Werner Almesberger <werner@almesberger.net>
PR 1954/cpukit PR 1954/cpukit

35
cpukit/score/cpu/lm32/rtems/score/cpu.h
View File

@@ -3,20 +3,8 @@
*/ */
/* /*
* This include file contains information pertaining to the XXX * This include file contains information pertaining to the LM32
* processor. * processor.
*
* @note This file is part of a porting template that is intended
* to be used as the starting point when porting RTEMS to a new
* CPU family. The following needs to be done when using this as
* the starting point for a new port:
*
* + Anywhere there is an XXX, it should be replaced
* with information about the CPU family being ported to.
*
* + At the end of each comment section, there is a heading which
* says "Port Specific Information:". When porting to RTEMS,
* add CPU family specific information in this section
*/ */
/* /*
@@ -347,9 +335,9 @@ extern "C" {
* *
* Port Specific Information: * Port Specific Information:
* *
* XXX document implementation including references if appropriate * L2 cache lines are 32 bytes in Milkymist SoC
*/ */
#define CPU_STRUCTURE_ALIGNMENT __attribute__ ((aligned (8))) #define CPU_STRUCTURE_ALIGNMENT __attribute__ ((aligned (32)))
#define CPU_TIMESTAMP_USE_INT64_INLINE TRUE #define CPU_TIMESTAMP_USE_INT64_INLINE TRUE
@@ -634,10 +622,12 @@ SCORE_EXTERN Context_Control_fp _CPU_Null_fp_context;
* alignment does not take into account the requirements for the stack. * alignment does not take into account the requirements for the stack.
* *
* Port Specific Information: * Port Specific Information:
* * The LM32 architecture manual simply states: "All memory accesses must be
* XXX document implementation including references if appropriate * aligned to the size of the access", and there is no hardware support
* whatsoever for 64-bit numbers.
* (lm32_archman.pdf, July 2009, p. 15)
*/ */
#define CPU_ALIGNMENT 8 #define CPU_ALIGNMENT 4
/** /**
* This number corresponds to the byte alignment requirement for the * This number corresponds to the byte alignment requirement for the
@@ -685,17 +675,14 @@ SCORE_EXTERN Context_Control_fp _CPU_Null_fp_context;
/** /**
* This number corresponds to the byte alignment requirement for the * This number corresponds to the byte alignment requirement for the
* stack. This alignment requirement may be stricter than that for the * stack. This alignment requirement may be stricter than that for the
* data types alignment specified by @ref CPU_ALIGNMENT. If the * data types alignment specified by @ref CPU_ALIGNMENT.
* @ref CPU_ALIGNMENT is strict enough for the stack, then this should be
* set to 0.
* *
* @note This must be a power of 2 either 0 or greater than @ref CPU_ALIGNMENT.
* *
* Port Specific Information: * Port Specific Information:
* *
* XXX document implementation including references if appropriate * Stack is software-managed
*/ */
#define CPU_STACK_ALIGNMENT 4 #define CPU_STACK_ALIGNMENT CPU_ALIGNMENT
/* /*
* ISR handler macros * ISR handler macros