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authorPeter Maydell <peter.maydell@linaro.org>2016-10-24 16:26:49 +0100
committerPeter Maydell <peter.maydell@linaro.org>2016-10-24 16:26:49 +0100
commit20bccb82ff3ea09bcb7c4ee226d3160cab15f7da (patch)
treebeb472fa034fe9e742c571f678982235695f29eb /roms
parent66ec9f49399f0a9fa13ee77c472caba0de2773fc (diff)
cpu: Support a target CPU having a variable page size
Support target CPUs having a page size which isn't knownn at compile time. To use this, the CPU implementation should: * define TARGET_PAGE_BITS_VARY * not define TARGET_PAGE_BITS * define TARGET_PAGE_BITS_MIN to the smallest value it might possibly want for TARGET_PAGE_BITS * call set_preferred_target_page_bits() in its realize function to indicate the actual preferred target page size for the CPU (and report any error from it) In CONFIG_USER_ONLY, the CPU implementation should continue to define TARGET_PAGE_BITS appropriately for the guest OS page size. Machines which want to take advantage of having the page size something larger than TARGET_PAGE_BITS_MIN must set the MachineClass minimum_page_bits field to a value which they guarantee will be no greater than the preferred page size for any CPU they create. Note that changing the target page size by setting minimum_page_bits is a migration compatibility break for that machine. For debugging purposes, attempts to use TARGET_PAGE_SIZE before it has been finally confirmed will assert. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'roms')
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