=> R1 = 9 + flags
R2 = disc address
R3 = pointer to block to read into
R4 = size to read
R6 = cache handle
<= R2 = next disc address
R3 = next free address
R4 = unread bytes
R6 = cache handle
This reason code reads sectors via a cache held in RMA, and isn't available under RISC OS 2.
To start a sequence of these operations, set R6 (cache handle) to zero on entry. Its value will be updated on exit, and subsequent calls should use this new value. Bits 4-7 of R1 should be zero, but are ignored if set.
To discard the cache once finished, just call FileCore_DiscardReadSectorsCache.
Note: For RISC OS 3.60, the value in R2 will be rounded down to be sector aligned.
[sh-index] Back to list of manuals
|
| |
