summaryrefslogtreecommitdiff
path: root/drivers/mailbox
diff options
context:
space:
mode:
authorChristophe Leroy <christophe.leroy@c-s.fr>2019-11-26 17:43:29 +0000
committerMichael Ellerman <mpe@ellerman.id.au>2020-01-23 21:31:14 +1100
commit39413ae009674c6ba745850515b551bbb9d6374b (patch)
treeb743c9950361f2d2246166aac9ad2554be1dc28d /drivers/mailbox
parent991d656d722dbc783481f408d6e4cbcce2e8bb78 (diff)
powerpc/hw_breakpoints: Rewrite 8xx breakpoints to allow any address range size.
Unlike standard powerpc, Powerpc 8xx doesn't have SPRN_DABR, but it has a breakpoint support based on a set of comparators which allow more flexibility. Commit 4ad8622dc548 ("powerpc/8xx: Implement hw_breakpoint") implemented breakpoints by emulating the DABR behaviour. It did this by setting one comparator the match 4 bytes at breakpoint address and the other comparator to match 4 bytes at breakpoint address + 4. Rewrite 8xx hw_breakpoint to make breakpoints match all addresses defined by the breakpoint address and length by making full use of comparators. Now, comparator E is set to match any address greater than breakpoint address minus one. Comparator F is set to match any address lower than breakpoint address plus breakpoint length. Addresses are aligned to 32 bits. When the breakpoint range starts at address 0, the breakpoint is set to match comparator F only. When the breakpoint range end at address 0xffffffff, the breakpoint is set to match comparator E only. Otherwise the breakpoint is set to match comparator E and F. At the same time, use registers bit names instead of hardcoded values. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/05105deeaf63bc02151aea2cdeaf525534e0e9d4.1574790198.git.christophe.leroy@c-s.fr
Diffstat (limited to 'drivers/mailbox')
0 files changed, 0 insertions, 0 deletions