From: James Hogan <james.hogan@imgtec.com>
Date: Tue, 9 Oct 2012 09:54:51 +0000 (+0100)
Subject: metag: System Calls
X-Git-Tag: v3.9-rc1~7^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=26025bbfbba33a9425be1b89eccb4664ea4c17b6;p=pandora-kernel.git

metag: System Calls

Add metag system call and gateway page interfaces. The metag
architecture port uses the generic system call numbers from
asm-generic/unistd.h, as well as a user gateway page mapped at
0x6ffff000 which contains fast atomic primitives (depending on SMP) and
a fast method of accessing TLS data.

System calls use the SWITCH instruction with the immediate 0x440001 to
signal a system call.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
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