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arch(7): add a table of per-arch initial/final FreeBSD version

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Reviewed by:	kib, wblock
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D10573
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emaste 2017-05-05 16:40:45 +00:00
parent 1d5c0f311c
commit 85b062efee
1 changed files with 45 additions and 1 deletions
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46
share/man/man7/arch.7
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@ -37,6 +37,9 @@ Differences between CPU architectures and platforms supported by
.Fx .
.Ss Introduction
If not explicitly mentioned, sizes are in bytes.
The architecture details in this document apply to
.Fx 10.0
and later, unless otherwise noted.
.Pp
FreeBSD uses flat address space for program execution, where
pointers have the same binary representation as
@ -72,6 +75,42 @@ The kernel is located at the highest addresses.
.Pp
On each architecture, the main user mode thread's stack starts near
the highest user address and grows down.
.Pp
.Fx
architecture support varies by release.
This table shows the first
.Fx
release to support each architecture, and, for discontinued
architectures, the final release.
.Pp
.Bl -column -offset indent "Sy Architecture" "Sy Initial Release" "Sy Final Release"
.It Sy Architecture Ta Sy Initial Release Ta Sy Final Release
.It alpha Ta 1.0 Ta 6.4
.It amd64 Ta 5.1
.It arm Ta 6.0
.It armeb Ta 8.0
.It armv6 Ta 10.0
.It arm64 Ta 11.0
.It ia64 Ta 5.0 Ta 10.x
.It i386 Ta 1.0
.It mips Ta 8.0
.It mipsel Ta 9.0
.It mipselhf Ta 12.0
.It mipshf Ta 12.0
.It mipsn32 Ta 9.0
.It mips64 Ta 9.0
.It mips64el Ta 9.0
.It mips64elhf Ta 12.0
.It mips64hf Ta 12.0
.It pc98 Ta 5.0 Ta 11.x
.It powerpc Ta 6.0
.It powerpcspe Ta 12.0
.It powerpc64 Ta 6.0
.It riscv64 Ta 12.0
.It riscv64sf Ta 12.0
.It sparc64 Ta 5.0
.El
.Ss Type sizes
All FreeBSD architectures use some variant of the ELF (see
.Xr elf 5 )
@ -220,7 +259,7 @@ variants of powerpc.
.It amd64 Ta hard Ta hard, 80 bit
.It arm Ta soft Ta soft, double precision
.It armeb Ta soft Ta soft, double precision
.It armv6 Ta hard Ta hard, double precision
.It armv6 Ta hard(1) Ta hard, double precision
.It arm64 Ta hard Ta soft, quad precision
.It i386 Ta hard Ta hard, 80 bit
.It mips Ta soft Ta identical to double
@ -239,6 +278,11 @@ variants of powerpc.
.It riscv64sf Ta soft Ta soft, double precision
.It sparc64 Ta hard Ta hard, quad precision
.El
.Pp
(1) Prior to
.Fx 11.0 ,
armv6 used the softfp ABI even though it supported only processors
with a floating point unit.
.Ss Predefined Macros
The compiler provides a number of predefined macros.
Some of these provide architecture-specific details and are explained below.