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void *RISCOS_MapInIO(unsigned int flags, void *phys, unsigned int size) flags: bit 2 => make memory bufferable phys: physical address to map in size: number of bytes of memory to map in
Entry | |
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flags | Bit 2: Make memory bufferable |
Other bits: Ambiguous! | |
phys | Physical address to map in |
size | Number of bytes of memory to map in |
Exit | |
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- | Virtual address corresponding to phys |
0 for failure |
This routine is used to map in IO memory for the HAL’s usage. Normally it would only be called during the execution of HAL_Init. Once mapped in the IO space cannot be released.
It returns the resultant virtual address corresponding to phys, or 0 for failure. Failure can only occur if no RAM is available for page tables, or if the virtual address space is exhausted.