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| author | Stuart Menefy <stuart.menefy@st.com> | 2007-11-30 16:12:36 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2008-01-28 13:18:58 +0900 |
| commit | 1efe4ce3ca126da77e450d5a83f7201949d76f62 (patch) | |
| tree | fbae9902aa4103a9e86d06f841d580f24682e7b3 /arch/sh/kernel/entry-common.S | |
| parent | 53ff09422e5e7a6d6198b767c8f494e43ec8e3ae (diff) | |
| download | op-kernel-dev-1efe4ce3ca126da77e450d5a83f7201949d76f62.zip op-kernel-dev-1efe4ce3ca126da77e450d5a83f7201949d76f62.tar.gz | |
sh: GUSA atomic rollback support.
This implements kernel-level atomic rollback built on top of gUSA,
as an alternative non-IRQ based atomicity method. This is generally
a faster method for platforms that are lacking the LL/SC pairs that
SH-4A and later use, and is only supportable on legacy cores.
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/entry-common.S')
| -rw-r--r-- | arch/sh/kernel/entry-common.S | 19 |
1 files changed, 0 insertions, 19 deletions
diff --git a/arch/sh/kernel/entry-common.S b/arch/sh/kernel/entry-common.S index 397ac71..926b2e7 100644 --- a/arch/sh/kernel/entry-common.S +++ b/arch/sh/kernel/entry-common.S @@ -176,25 +176,6 @@ work_notifysig: jmp @r1 lds r0, pr work_resched: -#if defined(CONFIG_GUSA) && !defined(CONFIG_PREEMPT) - ! gUSA handling - mov.l @(OFF_SP,r15), r0 ! get user space stack pointer - mov r0, r1 - shll r0 - bf/s 1f - shll r0 - bf/s 1f - mov #OFF_PC, r0 - ! SP >= 0xc0000000 : gUSA mark - mov.l @(r0,r15), r2 ! get user space PC (program counter) - mov.l @(OFF_R0,r15), r3 ! end point - cmp/hs r3, r2 ! r2 >= r3? - bt 1f - add r3, r1 ! rewind point #2 - mov.l r1, @(r0,r15) ! reset PC to rewind point #2 - ! -1: -#endif mov.l 1f, r1 jsr @r1 ! schedule nop |
