642909fdfb
Currently the compiler picks up the definition in machine/cpufunc.h. Add compiler memory barriers to read* and write*. The Linux x86 implementation of these functions uses inline asm with "memory" clobber. The Linux x86 implementation of read_relaxed* and write_relaxed* uses the same inline asm without "memory" clobber. Implement ioread* and iowrite* in terms of read* and write* so they also have memory barriers. Qualify the addr parameter in write* as volatile. Like Linux, define macros with the same name as the inline functions. Only define 64-bit versions on 64-bit architectures because generally 32-bit architectures can't do atomic 64-bit loads and stores. Regroup the functions a bit and add brief comments explaining what they do: - __raw_read*, __raw_write*: atomic, no barriers, no byte swapping - read_relaxed*, write_relaxed*: atomic, no barriers, little-endian - read*, write*: atomic, with barriers, little-endian Add a comment that says our implementation of ioread* and iowrite* only handles MMIO and does not support port IO. Reviewed by: hselasky MFC after: 3 days |
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