svn commit: r303033 - head/share/man/man7

[Jan Beich]

Ed Maste <emaste at FreeBSD.org> writes:

> +.It Sy Architecture Ta Sy Page Sizes
> +.It amd64       Ta 4K, 2M, 1G

Does FreeBSD support 1G pages nowadays?

$ sysctl hw.pagesizes
hw.pagesizes: 4096 2097152 0

$ dmesg | fgrep -i 1gb
  AMD Features=0x2c100800<SYSCALL,NX,Page1GB,RDTSCP,LM>

> +.Ss Predefined Macros
> +The compiler provides a number of predefined macros.
> +Some of these provide architecture-specific details and are explained below.
> +Other macros, including those required by the language standard, are not
> +included here.
[...]
> +cc -x c -Dm -E /dev/null

Typo: -Dm vs. -dM

> +.It Dv BYTE_ORDER Ta Either Dv BIG_ENDIAN or Dv LITTLE_ENDIAN .

Are these really compiler macros? I think, <machine/endian.h> defines them.

$ clang38 -x c -dM -E /dev/null | fgrep ENDIAN
#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
#define __LITTLE_ENDIAN__ 1
#define __ORDER_BIG_ENDIAN__ 4321
#define __ORDER_LITTLE_ENDIAN__ 1234
#define __ORDER_PDP_ENDIAN__ 3412

$ gcc5 -x c -dM -E /dev/null | fgrep ENDIAN
#define __ORDER_LITTLE_ENDIAN__ 1234
#define __FLOAT_WORD_ORDER__ __ORDER_LITTLE_ENDIAN__
#define __ORDER_PDP_ENDIAN__ 3412
#define __ORDER_BIG_ENDIAN__ 4321
#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
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