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authorBernd Schmidt <bernds_cb1@t-online.de>2009-01-07 16:14:38 +0100
committerBryan Wu <cooloney@kernel.org>2009-01-07 16:14:38 +0100
commitdbdf20db537a5369c65330f878ad4905020a8bfa (patch)
treec7fa553755e2d75a6e98d3f32fbe41fab9f72609 /arch/blackfin/include/asm/context.S
parentBlackfin arch: update anomaly headers to match latest sheets (diff)
downloadlinux-dbdf20db537a5369c65330f878ad4905020a8bfa.tar.xz
linux-dbdf20db537a5369c65330f878ad4905020a8bfa.zip
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/context.S')
-rw-r--r--arch/blackfin/include/asm/context.S39
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/context.S b/arch/blackfin/include/asm/context.S
index 9ce21f68e914..16561ab18b38 100644
--- a/arch/blackfin/include/asm/context.S
+++ b/arch/blackfin/include/asm/context.S
@@ -357,3 +357,42 @@
SYSCFG = [sp++];
csync;
.endm
+
+.macro save_context_cplb
+ [--sp] = (R7:0, P5:0);
+ [--sp] = fp;
+
+ [--sp] = a0.x;
+ [--sp] = a0.w;
+ [--sp] = a1.x;
+ [--sp] = a1.w;
+
+ [--sp] = LC0;
+ [--sp] = LC1;
+ [--sp] = LT0;
+ [--sp] = LT1;
+ [--sp] = LB0;
+ [--sp] = LB1;
+
+ [--sp] = RETS;
+.endm
+
+.macro restore_context_cplb
+ RETS = [sp++];
+
+ LB1 = [sp++];
+ LB0 = [sp++];
+ LT1 = [sp++];
+ LT0 = [sp++];
+ LC1 = [sp++];
+ LC0 = [sp++];
+
+ a1.w = [sp++];
+ a1.x = [sp++];
+ a0.w = [sp++];
+ a0.x = [sp++];
+
+ fp = [sp++];
+
+ (R7:0, P5:0) = [SP++];
+.endm