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4 Commits (fb5c16d05e31983f1127e2f8a97d60f0ce0b4d81)

Author SHA1 Message Date
Benjamin Herrenschmidt e3941109af console: Cleanup console API 
Use a more generic console_init() instead of potato_uart_init(),
and do the same for interrupt control. There should be no
change in behaviour.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
 5 years ago
Paul Mackerras 2843c99a71 MMU: Implement reading of the process table 
This adds the PID register and repurposes SPR 720 as the PRTBL
register, which points to the base of the process table.  There
doesn't seem to be any point to implementing the partition table given
that we don't have hypervisor mode.

The MMU caches entry 0 of the process table internally (in pgtbl3)
plus the entry indexed by the value in the PID register (pgtbl0).
Both caches are invalidated by a tlbie[l] with RIC=2 or by a move to
PRTBL.  The pgtbl0 cache is invalidated by a move to PID.  The dTLB
and iTLB are cleared by a move to either PRTBL or PID.

Which of the two page table root pointers is used (pgtbl0 or pgtbl3)
depends on the MSB of the address being translated.  Since the segment
checking ensures that address(63) = address(62), this is sufficient to
map quadrants 0 and 3.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
 6 years ago
Paul Mackerras bee0c94fb4 tests/privileged: Update for instruction translation 
Since setting MSR[PR] = 1 forces instruction translation on, we need
to set up translations for the problem state code to use.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
 6 years ago
Paul Mackerras 10f4be4309 tests: Add a test for privileged instruction interrupts 
This adds a test that tries to execute various privileged instructions
with MSR[PR] = 1.  This also incidentally tests some of the MSR bit
manipulations.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
 6 years ago