72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
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/*
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* Copyright (c) 2021 EPAM Systems
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <arch/arm64/hypercall.h>
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#include <xen/events.h>
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#include <xen/generic.h>
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#include <xen/public/xen.h>
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#include <xen/public/memory.h>
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#include <device.h>
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#include <init.h>
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#include <kernel.h>
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#include <kernel/thread.h>
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#include <logging/log.h>
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LOG_MODULE_REGISTER(xen_enlighten);
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/*
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* During Xen Enlighten initialization we need to have allocated memory page,
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* where hypervisor shared_info will be mapped. k_aligned_alloc() is not
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* available on PRE_KERNEL_1 stage, so we will use statically allocated buffer,
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* which will be casted to 'struct shared_info'. It is needed to initialize Xen
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* event channels as soon as possible after start.
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*/
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static uint8_t shared_info_buf[XEN_PAGE_SIZE] __aligned(XEN_PAGE_SIZE);
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/* Remains NULL until mapping will be finished by Xen */
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shared_info_t *HYPERVISOR_shared_info;
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static int xen_map_shared_info(const shared_info_t *shared_page)
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{
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struct xen_add_to_physmap xatp;
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xatp.domid = DOMID_SELF;
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xatp.idx = 0;
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xatp.space = XENMAPSPACE_shared_info;
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xatp.gpfn = (((xen_pfn_t) shared_page) >> XEN_PAGE_SHIFT);
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return HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp);
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}
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static int xen_enlighten_init(const struct device *dev)
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{
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ARG_UNUSED(dev);
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int ret = 0;
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shared_info_t *info = (shared_info_t *) shared_info_buf;
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ret = xen_map_shared_info(info);
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if (ret) {
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LOG_ERR("%s: failed to map for Xen shared page, ret = %d\n",
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__func__, ret);
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return ret;
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}
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/* Set value for globally visible pointer */
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HYPERVISOR_shared_info = info;
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ret = xen_events_init();
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if (ret) {
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LOG_ERR("%s: failed init Xen event channels, ret = %d\n",
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__func__, ret);
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return ret;
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}
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return 0;
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}
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SYS_INIT(xen_enlighten_init, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);
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