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authorDavid S. Miller <davem@sunset.davemloft.net>2005-10-10 19:12:13 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2005-10-10 19:12:13 -0400
commit5d8e1b181c4ad63e6ca90d51287b31afd400d2eb (patch)
tree555d79c07b00def9f5eab72431ae95ebd5af4f86 /arch/sparc64/defconfig
parentf96c3bbe91117402f13119ce9e609db9087ed58f (diff)
[SPARC64]: Fix Ultra5, Ultra60, et al. boot failures.
On the boot processor, we need to do the move onto the Linux trap table a little bit differently else we'll take unhandlable faults in the firmware address space. Previously we would do the following: 1) Disable PSTATE_IE in %pstate. 2) Set %tba by hand to sparc64_ttable_tl0 3) Initialize alternate, mmu, and interrupt global trap registers. 4) Call prom_set_traptable() That doesn't work very well actually with the way we boot the kernel VM these days. It worked by luck on many systems because the firmware accesses for the prom_set_traptable() call happened to be loaded into the TLB already, something we cannot assume. So the new scheme is this: 1) Clear PSTATE_IE in %pstate and set %pil to 15 2) Call prom_set_traptable() 3) Initialize alternate, mmu, and interrupt global trap registers. and this works quite well. This sequence has been moved into a callable function in assembler named setup-trap_table(). The idea is that eventually trampoline.S can use this code as well. That isn't possible currently due to some complications, but eventually we should be able to do it. Thanks to Meelis Roos for the Ultra5 boot failure report. Signed-off-by: David S. Miller <davem@davemloft.net>
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