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Revision 5c16736a

ID5c16736a371525e1bafd1941b0d9a83c84cb0702

Added by balrog almost 13 years ago

SH4: Eliminate P4 to A7 mangling (Takashi YOSHII).

Main purpose of this is to delete
*physical = address & 0x1fffffff;
at target-sh4/helper.c:449, using new mmio rule introduced by #5849
This masking is a nice trick to realize P4/A7 duality of SH registers.
But, IMHO, it is logically wrong.

Most of SH4 cpu control registers in P4 area(0xfc000000...0xffffffff) have
one more address called A7 which is usually P4 address with upper 3bits masked.
This is an address only appears in TLB's physical address part.

Current code use trick writing drivers as if they are really in A7
(that's why you see many _A7 in hw/sh.c), and using translation P4 to A7.

Signed-off-by: Takashi YOSHII <>
Signed-off-by: Andrzej Zaborowski <>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5935 c046a42c-6fe2-441c-8c8c-71466251a162

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