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powerpc: Add length setting to set_dawr

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Currently we set the length field in the DAWR to 0 which defaults it to one
double word (64bits) which is the same as the DABR.

Change this so that we can set it to longer values as supported by the DAWR.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Neuling 2013-01-24 15:02:58 +00:00 committed by Benjamin Herrenschmidt
parent f53d168c02
commit 05d694ea0d
1 changed files with 9 additions and 1 deletions
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10
arch/powerpc/kernel/process.c
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@ -409,7 +409,7 @@ static inline int set_dabr(struct arch_hw_breakpoint *brk)
static inline int set_dawr(struct arch_hw_breakpoint *brk)
{
unsigned long dawr, dawrx;
unsigned long dawr, dawrx, mrd;
dawr = brk->address;
@ -419,6 +419,14 @@ static inline int set_dawr(struct arch_hw_breakpoint *brk)
<< (63 - 59); //* translate */
dawrx |= (brk->type & (HW_BRK_TYPE_PRIV_ALL)) \
>> 3; //* PRIM bits */
/* dawr length is stored in field MDR bits 48:53. Matches range in
doublewords (64 bits) baised by -1 eg. 0b000000=1DW and
0b111111=64DW.
brk->len is in bytes.
This aligns up to double word size, shifts and does the bias.
*/
mrd = ((brk->len + 7) >> 3) - 1;
dawrx |= (mrd & 0x3f) << (63 - 53);
if (ppc_md.set_dawr)
return ppc_md.set_dawr(dawr, dawrx);