iCE40/yosys - clone of https://github.com/YosysHQ/yosys

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Diffstat (limited to 'examples/intel/MAX10/runme_postsynth')

0 files changed, 0 insertions, 0 deletions

/****************************************************************************** * arch/xen/drivers/blkif/backend/interface.c * * Block-device interface management. * * Copyright (c) 2004, Keir Fraser */ #include "common.h" #include <asm-xen/evtchn.h> static kmem_cache_t *blkif_cachep; blkif_t *alloc_blkif(domid_t domid) { blkif_t *blkif; blkif = kmem_cache_alloc(blkif_cachep, GFP_KERNEL); if (!blkif) return ERR_PTR(-ENOMEM); memset(blkif, 0, sizeof(*blkif)); blkif->domid = domid; blkif->status = DISCONNECTED; spin_lock_init(&blkif->blk_ring_lock); atomic_set(&blkif->refcnt, 1); return blkif; } static int map_frontend_page(blkif_t *blkif, unsigned long shared_page) { struct gnttab_map_grant_ref op; op.host_addr = (unsigned long)blkif->blk_ring_area->addr; op.flags = GNTMAP_host_map; op.ref = shared_page; op.dom = blkif->domid; lock_vm_area(blkif->blk_ring_area); BUG_ON(HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, &op, 1)); unlock_vm_area(blkif->blk_ring_area); if (op.handle < 0) { DPRINTK(" Grant table operation failure !\n"); return op.handle; } blkif->shmem_ref = shared_page; blkif->shmem_handle = op.handle; return 0; } static void unmap_frontend_page(blkif_t *blkif) { struct gnttab_unmap_grant_ref op; op.host_addr = (unsigned long)blkif->blk_ring_area->addr; op.handle = blkif->shmem_handle; op.dev_bus_addr = 0; lock_vm_area(blkif->blk_ring_area); BUG_ON(HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, &op, 1)); unlock_vm_area(blkif->blk_ring_area); } int blkif_map(blkif_t *blkif, unsigned long shared_page, unsigned int evtchn) { blkif_sring_t *sring; int err; evtchn_op_t op = { .cmd = EVTCHNOP_bind_interdomain, .u.bind_interdomain.remote_dom = blkif->domid, .u.bind_interdomain.remote_port = evtchn }; if ((blkif->blk_ring_area = alloc_vm_area(PAGE_SIZE)) == NULL) return -ENOMEM; err = map_frontend_page(blkif, shared_page); if (err) { free_vm_area(blkif->blk_ring_area); return err; } err = HYPERVISOR_event_channel_op(&op); if (err) { unmap_frontend_page(blkif); free_vm_area(blkif->blk_ring_area); return err; } blkif->evtchn = op.u.bind_interdomain.local_port; sring = (blkif_sring_t *)blkif->blk_ring_area->addr; SHARED_RING_INIT(sring); BACK_RING_INIT(&blkif->blk_ring, sring, PAGE_SIZE); blkif->irq = bind_evtchn_to_irqhandler( blkif->evtchn, blkif_be_int, 0, "blkif-backend", blkif); blkif->status = CONNECTED; return 0; } static void free_blkif(void *arg) { blkif_t *blkif = (blkif_t *)arg; if (blkif->irq) unbind_evtchn_from_irqhandler(blkif->irq, blkif); if (blkif->blk_ring.sring) { unmap_frontend_page(blkif); free_vm_area(blkif->blk_ring_area); blkif->blk_ring.sring = NULL; } kmem_cache_free(blkif_cachep, blkif); } void free_blkif_callback(blkif_t *blkif) { INIT_WORK(&blkif->free_work, free_blkif, (void *)blkif); schedule_work(&blkif->free_work); } void __init blkif_interface_init(void) { blkif_cachep = kmem_cache_create( "blkif_cache", sizeof(blkif_t), 0, 0, NULL, NULL); } /* * Local variables: * c-file-style: "linux" * indent-tabs-mode: t * c-indent-level: 8 * c-basic-offset: 8 * tab-width: 8 * End: */


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