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Subject[PATCH 54/62] Blackfin: convert early_printk EVT init to a loop
Date
The EVT registers are all contiguous in the memory map, so using a loop to
initialize them all rather than hardcoding the list results in much better
generated code (a hardware loop rather than a whole bunch of individual
loads).

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
arch/blackfin/kernel/early_printk.c | 16 +++-------------
1 files changed, 3 insertions(+), 13 deletions(-)
diff --git a/arch/blackfin/kernel/early_printk.c b/arch/blackfin/kernel/early_printk.c
index c8ad051..3302719 100644
--- a/arch/blackfin/kernel/early_printk.c
+++ b/arch/blackfin/kernel/early_printk.c
@@ -178,25 +178,15 @@ int __init setup_early_printk(char *buf)

asmlinkage void __init init_early_exception_vectors(void)
{
+ u32 evt;
SSYNC();

/* cannot program in software:
* evt0 - emulation (jtag)
* evt1 - reset
*/
- bfin_write_EVT2(early_trap);
- bfin_write_EVT3(early_trap);
- bfin_write_EVT5(early_trap);
- bfin_write_EVT6(early_trap);
- bfin_write_EVT7(early_trap);
- bfin_write_EVT8(early_trap);
- bfin_write_EVT9(early_trap);
- bfin_write_EVT10(early_trap);
- bfin_write_EVT11(early_trap);
- bfin_write_EVT12(early_trap);
- bfin_write_EVT13(early_trap);
- bfin_write_EVT14(early_trap);
- bfin_write_EVT15(early_trap);
+ for (evt = EVT2; evt <= EVT15; evt += 4)
+ bfin_write32(evt, early_trap);
CSYNC();

/* Set all the return from interrupt, exception, NMI to a known place
--
1.6.3.1


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