diff options
| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2007-12-21 15:39:26 +1100 |
|---|---|---|
| committer | Josh Boyer <jwboyer@linux.vnet.ibm.com> | 2007-12-23 13:13:03 -0600 |
| commit | 9dae8afdf212d39bc7c25f1b1ca9b10f10f6beaa (patch) | |
| tree | 12721945adf3a3fc01ba292e1756af4826a7eed3 /arch/powerpc/kernel/misc_32.S | |
| parent | 69c0785112921a43739495a68f459fde88a9bbd8 (diff) | |
[POWERPC] 4xx: Add early udbg support for 40x processors
This adds some basic real mode based early udbg support for 40x
in order to debug things more easily
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Diffstat (limited to 'arch/powerpc/kernel/misc_32.S')
| -rw-r--r-- | arch/powerpc/kernel/misc_32.S | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S index ea1137851a4a..be09f0d2d90b 100644 --- a/arch/powerpc/kernel/misc_32.S +++ b/arch/powerpc/kernel/misc_32.S @@ -206,6 +206,45 @@ _GLOBAL(_nmask_and_or_msr) isync blr /* Done */ +#ifdef CONFIG_40x + +/* + * Do an IO access in real mode + */ +_GLOBAL(real_readb) + mfmsr r7 + ori r0,r7,MSR_DR + xori r0,r0,MSR_DR + sync + mtmsr r0 + sync + isync + lbz r3,0(r3) + sync + mtmsr r7 + sync + isync + blr + + /* + * Do an IO access in real mode + */ +_GLOBAL(real_writeb) + mfmsr r7 + ori r0,r7,MSR_DR + xori r0,r0,MSR_DR + sync + mtmsr r0 + sync + isync + stb r3,0(r4) + sync + mtmsr r7 + sync + isync + blr + +#endif /* CONFIG_40x */ /* * Flush MMU TLB |