Author: jhibbits
Date: Fri Nov 6 04:56:52 2015
New Revision: 290434
URL: https://svnweb.freebsd.org/changeset/base/290434
Log:
Write 2- and 4-byte aligned values as single writes in ddb(4)
On the mpc85xx SoC family, writes to any part of a word in the CCSR affect the
full word. This prevents single-byte writes from taking the desired effect.
Code copied directly from ARM.
Modified:
head/sys/powerpc/powerpc/db_interface.c
Modified: head/sys/powerpc/powerpc/db_interface.c
==============================================================================
--- head/sys/powerpc/powerpc/db_interface.c Fri Nov 6 04:45:29 2015
(r290433)
+++ head/sys/powerpc/powerpc/db_interface.c Fri Nov 6 04:56:52 2015
(r290434)
@@ -67,8 +67,14 @@ db_write_bytes(vm_offset_t addr, size_t
dst = (char *)addr;
cnt = size;
- while (cnt-- > 0)
- *dst++ = *data++;
+ if (size == 4 && (addr & 3) == 0 && ((uintptr_t)data & 3) == 0)
+ *((int*)dst) = *((int*)data);
+ else
+ if (size == 2 && (addr & 1) == 0 && ((uintptr_t)data & 1) == 0)
+ *((short*)dst) = *((short*)data);
+ else
+ while (cnt-- > 0)
+ *dst++ = *data++;
kdb_cpu_sync_icache((void *)addr, size);
}
(void)kdb_jmpbuf(prev_jb);
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