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Improved certain Cortex-M3 context switch times

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2177 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2009-10-25 02:24:40 +00:00
parent ad41c8a341
commit e89affe3a2
19 changed files with 1010 additions and 163 deletions
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ChangeLog
+6 -1
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@@ -918,7 +918,12 @@
* include/nuttx/mtd.h. Added a simple interface definition to support some
FLASH, EEPROM, NVRAM, etc. devices.
* driver/mtd/m25px.c. Added a driver for SPI based FLASH parts M25P64 and M25P128.
* confgs/stm3210e-eval/usbserial. Add a USB serial configuration for the STM32.
* configs/stm3210e-eval/usbserial. Add a USB serial configuration for the STM32.
This is for test and development; the STM32 has not yet been checked in.
* arch/arm/src/cortexm3/up_switchcontext.S & up_svccall.c. Made an improvement
to context switching. There are two types of context switches: interrupt
context switches and background/user context switches. This change should
improve the performance of those background/user context switches by a factor
of about two.