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For ARM, MIPS, and PowerPC, default to 32-byte alignment, but allow it

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to be as small as 8.
This commit is contained in:
Warner Losh 2013-05-17 20:53:15 +00:00
parent e3ed7ff03f
commit 8b18cb1c23
1 changed files with 4 additions and 0 deletions
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4
sys/dev/usb/usb_freebsd.h
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@ -56,8 +56,12 @@
#if (!defined(USB_HOST_ALIGN)) || (USB_HOST_ALIGN <= 0)
/* Use default value. */
#undef USB_HOST_ALIGN
#if defined(__arm__) || defined(__mips__) || defined(__powerpc__)
#define USB_HOST_ALIGN 32 /* Arm and MIPS need at least this much, if not more */
#else
#define USB_HOST_ALIGN 8 /* bytes, must be power of two */
#endif
#endif
/* Sanity check for USB_HOST_ALIGN: Verify power of two. */
#if ((-USB_HOST_ALIGN) & USB_HOST_ALIGN) != USB_HOST_ALIGN
#error "USB_HOST_ALIGN is not power of two."