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sh: Optimized flush_icache_range() implementation.

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Add implementation of flush_icache_range() suitable for signal handler
and kprobes. Remove flush_cache_sigtramp() and change signal.c to use
flush_icache_range().

Signed-off-by: Chris Smith <chris.smith@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Chris Smith 2008-07-02 15:17:11 +09:00 committed by Paul Mundt
parent 3611ee7acc
commit 09b5a10c19
3 changed files with 34 additions and 36 deletions
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10
arch/sh/kernel/signal_32.c
View File

@ -398,10 +398,7 @@ static int setup_frame(int sig, struct k_sigaction *ka,
pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
flush_cache_sigtramp(regs->pr);
if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);
flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
return 0;
@ -486,10 +483,7 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
flush_cache_sigtramp(regs->pr);
if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);
flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
return 0;

53
arch/sh/mm/cache-sh4.c
View File

@ -4,6 +4,7 @@
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
* Copyright (C) 2001 - 2007 Paul Mundt
* Copyright (C) 2003 Richard Curnow
* Copyright (c) 2007 STMicroelectronics (R&D) Ltd.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
@ -22,6 +23,7 @@
* entirety.
*/
#define MAX_DCACHE_PAGES 64 /* XXX: Tune for ways */
#define MAX_ICACHE_PAGES 32
static void __flush_dcache_segment_1way(unsigned long start,
unsigned long extent);
@ -178,42 +180,45 @@ void __flush_invalidate_region(void *start, int size)
/*
* Write back the range of D-cache, and purge the I-cache.
*
* Called from kernel/module.c:sys_init_module and routine for a.out format.
* Called from kernel/module.c:sys_init_module and routine for a.out format,
* signal handler code and kprobes code
*/
void flush_icache_range(unsigned long start, unsigned long end)
{
flush_cache_all();
}
/*
* Write back the D-cache and purge the I-cache for signal trampoline.
* .. which happens to be the same behavior as flush_icache_range().
* So, we simply flush out a line.
*/
void __uses_jump_to_uncached flush_cache_sigtramp(unsigned long addr)
{
unsigned long v, index;
unsigned long flags;
int icacheaddr;
unsigned long flags, v;
int i;
v = addr & ~(L1_CACHE_BYTES-1);
asm volatile("ocbwb %0"
: /* no output */
: "m" (__m(v)));
index = CACHE_IC_ADDRESS_ARRAY |
(v & boot_cpu_data.icache.entry_mask);
/* If there are too many pages then just blow the caches */
if (((end - start) >> PAGE_SHIFT) >= MAX_ICACHE_PAGES) {
flush_cache_all();
} else {
/* selectively flush d-cache then invalidate the i-cache */
/* this is inefficient, so only use for small ranges */
start &= ~(L1_CACHE_BYTES-1);
end += L1_CACHE_BYTES-1;
end &= ~(L1_CACHE_BYTES-1);
local_irq_save(flags);
jump_to_uncached();
for (i = 0; i < boot_cpu_data.icache.ways;
i++, index += boot_cpu_data.icache.way_incr)
ctrl_outl(0, index); /* Clear out Valid-bit */
for (v = start; v < end; v+=L1_CACHE_BYTES) {
asm volatile("ocbwb %0"
: /* no output */
: "m" (__m(v)));
icacheaddr = CACHE_IC_ADDRESS_ARRAY | (
v & cpu_data->icache.entry_mask);
for (i = 0; i < cpu_data->icache.ways;
i++, icacheaddr += cpu_data->icache.way_incr)
/* Clear i-cache line valid-bit */
ctrl_outl(0, icacheaddr);
}
back_to_cached();
wmb();
local_irq_restore(flags);
}
}
static inline void flush_cache_4096(unsigned long start,

1
include/asm-sh/cpu-sh4/cacheflush.h
View File

@ -30,7 +30,6 @@ void flush_dcache_page(struct page *pg);
#define flush_dcache_mmap_unlock(mapping) do { } while (0)
void flush_icache_range(unsigned long start, unsigned long end);
void flush_cache_sigtramp(unsigned long addr);
void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
unsigned long addr, int len);