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* xen/arm: implement alloc/free_xenballooned_pages with alloc_pages/kfreeStefano Stabellini2012-08-081-0/+18
| | | | | | | | Only until we get the balloon driver to work. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen/arm: receive Xen events on ARMStefano Stabellini2012-09-141-0/+33
| | | | | | | | | | Compile events.c on ARM. Parse, map and enable the IRQ to get event notifications from the device tree (node "/xen"). Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen/arm: initialize grant_table on ARMStefano Stabellini2012-09-131-0/+14
| | | | | | | | | | | | | | Initialize the grant table mapping at the address specified at index 0 in the DT under the /xen node. After the grant table is initialized, call xenbus_probe (if not dom0). Changes in v2: - introduce GRANT_TABLE_PHYSADDR; - remove unneeded initialization of boot_max_nr_grant_frames. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
* xen/arm: get privilege statusStefano Stabellini2012-08-081-0/+7
| | | | | | | | | | Use Xen features to figure out if we are privileged. XENFEAT_dom0 was introduced by 23735 in xen-unstable.hg. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen/arm: Xen detection and shared_info page mappingStefano Stabellini2012-09-141-0/+61
| | | | | | | | | | | | | | | | | | | | | | | | | Check for a node in the device tree compatible with "xen,xen", if it is present set xen_domain_type to XEN_HVM_DOMAIN and continue initialization. Map the real shared info page using XENMEM_add_to_physmap with XENMAPSPACE_shared_info. Changes in v4: - simpler parsing of Xen version in the compatible DT node. Changes in v3: - use the "xen,xen" notation rather than "arm,xen"; - add an additional check on the presence of the Xen version. Changes in v2: - replace pr_info with pr_debug. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
* xen/arm: empty implementation of grant_table arch specific functionsStefano Stabellini2012-08-082-1/+54
| | | | | | | | | | Changes in v2: - return -ENOSYS rather than -1. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* xen/arm: hypercallsStefano Stabellini2012-09-142-1/+107
| | | | | | | | | | | | | | | | | | | | | | | | Use r12 to pass the hypercall number to the hypervisor. We need a register to pass the hypercall number because we might not know it at compile time and HVC only takes an immediate argument. Among the available registers r12 seems to be the best choice because it is defined as "intra-procedure call scratch register". Use the ISS to pass an hypervisor specific tag. Changes in v2: - define an HYPERCALL macro for 5 arguments hypercall wrappers, even if at the moment is unused; - use ldm instead of pop; - fix up comments. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
* arm: initial Xen supportStefano Stabellini2012-09-142-0/+36
- Basic hypervisor.h and interface.h definitions. - Skeleton enlighten.c, set xen_start_info to an empty struct. - Make xen_initial_domain dependent on the SIF_PRIVILIGED_BIT. The new code only compiles when CONFIG_XEN is set, that is going to be added to arch/arm/Kconfig in patch #11 "xen/arm: introduce CONFIG_XEN on ARM". Changes in v3: - improve comments. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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