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authorBernd Schmidt <bernds_cb1@t-online.de>2009-01-07 18:14:38 +0300
committerBryan Wu <cooloney@kernel.org>2009-01-07 18:14:38 +0300
commitdbdf20db537a5369c65330f878ad4905020a8bfa (patch)
treec7fa553755e2d75a6e98d3f32fbe41fab9f72609 /arch/blackfin/include/asm/entry.h
parent6651ece9e257302ee695ee76e69a4427f7033235 (diff)
downloadlinux-dbdf20db537a5369c65330f878ad4905020a8bfa.tar.xz
Blackfin arch: Faster C implementation of no-MPU CPLB handler
This is a mixture ofcMichael McTernan's patch and the existing cplb-mpu code. We ditch the old cplb-nompu implementation, which is a good example of why a good algorithm in a HLL is preferrable to a bad algorithm written in assembly. Rather than try to construct a table of all posible CPLBs and search it, we just create a (smaller) table of memory regions and their attributes. Some of the data structures are now unified for both the mpu and nompu cases. A lot of needless complexity in cplbinit.c is removed. Further optimizations: * compile cplbmgr.c with a lot of -ffixed-reg options, and omit saving these registers on the stack when entering a CPLB exception. * lose cli/nop/nop/sti sequences for some workarounds - these don't * make sense in an exception context Additional code unification should be possible after this. [Mike Frysinger <vapier.adi@gmail.com>: - convert CPP if statements to C if statements - remove redundant statements - use a do...while loop rather than a for loop to get slightly better optimization and to avoid gcc "may be used uninitialized" warnings ... we know that the [id]cplb_nr_bounds variables will never be 0, so this is OK - the no-mpu code was the last user of MAX_MEM_SIZE and with that rewritten, we can punt it - add some BUG_ON() checks to make sure we dont overflow the small cplb_bounds array - add i/d cplb entries for the bootrom because there is functions/data in there we want to access - we do not need a NULL trailing entry as any time we access the bounds arrays, we use the nr_bounds variable ] Signed-off-by: Michael McTernan <mmcternan@airvana.com> Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de> Signed-off-by: Bryan Wu <cooloney@kernel.org>
Diffstat (limited to 'arch/blackfin/include/asm/entry.h')
-rw-r--r--arch/blackfin/include/asm/entry.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/entry.h b/arch/blackfin/include/asm/entry.h
index c4f721e0d00d..d94e4f5139d2 100644
--- a/arch/blackfin/include/asm/entry.h
+++ b/arch/blackfin/include/asm/entry.h
@@ -53,9 +53,11 @@
/* This one pushes RETI without using CLI. Interrupts are enabled. */
#define SAVE_CONTEXT_SYSCALL save_context_syscall
#define SAVE_CONTEXT save_context_with_interrupts
+#define SAVE_CONTEXT_CPLB save_context_cplb
#define RESTORE_ALL_SYS restore_context_no_interrupts
#define RESTORE_CONTEXT restore_context_with_interrupts
+#define RESTORE_CONTEXT_CPLB restore_context_cplb
#endif /* __ASSEMBLY__ */
#endif /* __BFIN_ENTRY_H */