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Penny Zheng
41c031ff43
Static Allocation refers to system or sub-system(domains) for which memory areas are pre-defined by configuration using physical address ranges. Those pre-defined memory, -- Static Memory, as parts of RAM reserved in the beginning, shall never go to heap allocator or boot allocator for any use. Memory can be statically allocated to a domain using the property "xen,static- mem" defined in the domain configuration. The number of cells for the address and the size must be defined using respectively the properties "#xen,static-mem-address-cells" and "#xen,static-mem-size-cells". The property 'memory' is still needed and should match the amount of memory given to the guest. Currently, it either comes from static memory or lets Xen allocate from heap. *Mixing* is not supported. The static memory will be mapped in the guest at the usual guest memory addresses (GUEST_RAM0_BASE, GUEST_RAM1_BASE) defined by xen/include/public/arch-arm.h. This patch introduces this new `xen,static-mem` feature, and also documents and parses this new attribute at boot time. This patch also introduces a new field "bool xen_domain" in "struct membank" to tell whether the memory bank is reserved as the whole hardware resource, or bind to a xen domain node, through "xen,static-mem" Signed-off-by: Penny Zheng <penny.zheng@arm.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
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