Consider GetRegAttrs/SetRegAttrs

Question

Consider GetRegAttrs/SetRegAttrs

Closed this issue 9 months ago · 3 comments

A driver may wish to map a particular reg range with specific memory attributes. This should take into account #44.

Answer 1 · 2024-02-13T04:13:24.000Z

Also, the reg may actually be unmapped. In fact, code probably shouldn't assume it's mapped.

E.g:

FS0:> dtreg /soc/rtc@101000 0
Dumping 1 bytes at offset 0x0 of reg via CPU 0x101000(1000):
!!!! RISCV64 Exception Type - 000000000000000D(EXCEPT_RISCV_LOAD_ACCESS_PAGE_FAULT) !!!!

Hiding this in FdtBusDxe without an explicit SetRegAttrs is probably not a great idea.

Answer 2 · 2024-02-13T06:23:50.000Z

GetReg issue is moved to #76 so not a high prio anymore.

Answer 3 · 2024-02-15T05:23:36.000Z

As per #78, the signature should be more along the lines of taking in a desired GCD type and memory attributes (and returning prior ones).

The obvious user here is HighMemDxe.