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sh: GUSA atomic rollback support.

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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>
This commit is contained in:
Stuart Menefy
2007-11-30 16:12:36 +09:00
committed by Paul Mundt
parent 53ff09422e
commit 1efe4ce3ca
13 changed files with 590 additions and 180 deletions
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18
arch/sh/kernel/signal_32.c
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@@ -507,24 +507,6 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
ctrl_inw(regs->pc - 4));
break;
}
#ifdef CONFIG_GUSA
} else {
/* gUSA handling */
preempt_disable();
if (regs->regs[15] >= 0xc0000000) {
int offset = (int)regs->regs[15];
/* Reset stack pointer: clear critical region mark */
regs->regs[15] = regs->regs[1];
if (regs->pc < regs->regs[0])
/* Go to rewind point #1 */
regs->pc = regs->regs[0] + offset -
instruction_size(ctrl_inw(regs->pc-4));
}
preempt_enable_no_resched();
#endif
}
/* Set up the stack frame */