OS_Memory 65 (changes)

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OS SWI Calls

» OS_Memory

» OS_Memory 65

OS_Memory 65

(SWI &68)

Use

This call allows software to perform logical to physical address translation. Unlike other calls such as OS_Memory 0, this call works on all types of memory / page table entry (regular 4KB RAM pages, 1MB I/O mappings, etc.)

Notes

Addresses need not be page aligned. The returned address will include the appropriate sub-page offset such that it is addressing the same byte as the input address.

If there is no mapping for the provided address, a “bad address” error (error no. &FC) will be returned. However, R2 will still be updated to contain the size/alignment of the mapping, to allow code which walks over an address range to skip ahead to the next page.

This call was introduced in RISC OS 5.29.

See also

• OS_Memory