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https://github.com/xen-project/xen.git
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280 lines
6.2 KiB
C
280 lines
6.2 KiB
C
/******************************************************************************
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*
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* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*/
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#include "xc_private.h"
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#include <xen/sys/evtchn.h>
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#include <unistd.h>
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#include <fcntl.h>
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int xc_interface_open(void)
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{
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int flags, saved_errno;
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int fd = open("/kern/xen/privcmd", O_RDWR);
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if ( fd == -1 )
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{
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PERROR("Could not obtain handle on privileged command interface");
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return -1;
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}
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/* Although we return the file handle as the 'xc handle' the API
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does not specify / guarentee that this integer is in fact
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a file handle. Thus we must take responsiblity to ensure
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it doesn't propagate (ie leak) outside the process */
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if ( (flags = fcntl(fd, F_GETFD)) < 0 )
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{
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PERROR("Could not get file handle flags");
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goto error;
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}
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flags |= FD_CLOEXEC;
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if ( fcntl(fd, F_SETFD, flags) < 0 )
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{
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PERROR("Could not set file handle flags");
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goto error;
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}
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return fd;
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error:
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saved_errno = errno;
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close(fd);
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errno = saved_errno;
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return -1;
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}
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int xc_interface_close(int xc_handle)
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{
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return close(xc_handle);
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}
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void *xc_map_foreign_batch(int xc_handle, uint32_t dom, int prot,
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xen_pfn_t *arr, int num)
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{
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privcmd_mmapbatch_t ioctlx;
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void *addr;
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addr = mmap(NULL, num*PAGE_SIZE, prot, MAP_ANON | MAP_SHARED, -1, 0);
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if ( addr == MAP_FAILED ) {
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perror("xc_map_foreign_batch: mmap failed");
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return NULL;
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}
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ioctlx.num=num;
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ioctlx.dom=dom;
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ioctlx.addr=(unsigned long)addr;
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ioctlx.arr=arr;
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if ( ioctl(xc_handle, IOCTL_PRIVCMD_MMAPBATCH, &ioctlx) < 0 )
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{
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int saved_errno = errno;
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perror("xc_map_foreign_batch: ioctl failed");
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(void)munmap(addr, num*PAGE_SIZE);
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errno = saved_errno;
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return NULL;
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}
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return addr;
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}
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void *xc_map_foreign_range(int xc_handle, uint32_t dom,
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int size, int prot,
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unsigned long mfn)
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{
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privcmd_mmap_t ioctlx;
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privcmd_mmap_entry_t entry;
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void *addr;
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addr = mmap(NULL, size, prot, MAP_ANON | MAP_SHARED, -1, 0);
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if ( addr == MAP_FAILED ) {
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perror("xc_map_foreign_range: mmap failed");
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return NULL;
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}
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ioctlx.num=1;
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ioctlx.dom=dom;
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ioctlx.entry=&entry;
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entry.va=(unsigned long) addr;
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entry.mfn=mfn;
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entry.npages=(size+PAGE_SIZE-1)>>PAGE_SHIFT;
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if ( ioctl(xc_handle, IOCTL_PRIVCMD_MMAP, &ioctlx) < 0 )
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{
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int saved_errno = errno;
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perror("xc_map_foreign_range: ioctl failed");
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(void)munmap(addr, size);
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errno = saved_errno;
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return NULL;
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}
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return addr;
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}
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void *xc_map_foreign_ranges(int xc_handle, uint32_t dom,
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size_t size, int prot, size_t chunksize,
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privcmd_mmap_entry_t entries[], int nentries)
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{
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privcmd_mmap_t ioctlx;
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int i, rc;
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void *addr;
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addr = mmap(NULL, size, prot, MAP_ANON | MAP_SHARED, -1, 0);
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if (addr == MAP_FAILED)
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goto mmap_failed;
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for (i = 0; i < nentries; i++) {
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entries[i].va = (uintptr_t)addr + (i * chunksize);
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entries[i].npages = chunksize >> PAGE_SHIFT;
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}
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ioctlx.num = nentries;
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ioctlx.dom = dom;
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ioctlx.entry = entries;
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rc = ioctl(xc_handle, IOCTL_PRIVCMD_MMAP, &ioctlx);
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if (rc)
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goto ioctl_failed;
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return addr;
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ioctl_failed:
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rc = munmap(addr, size);
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if (rc == -1)
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ERROR("%s: error in error path\n", __FUNCTION__);
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mmap_failed:
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return NULL;
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}
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static int do_privcmd(int xc_handle, unsigned int cmd, unsigned long data)
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{
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int err = ioctl(xc_handle, cmd, data);
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if (err == 0)
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return 0;
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else
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return -errno;
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}
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int do_xen_hypercall(int xc_handle, privcmd_hypercall_t *hypercall)
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{
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int error = do_privcmd(xc_handle,
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IOCTL_PRIVCMD_HYPERCALL,
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(unsigned long)hypercall);
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if (error)
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return error;
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else
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return (hypercall->retval);
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}
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#define EVTCHN_DEV_NAME "/dev/xenevt"
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int xc_evtchn_open(void)
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{
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return open(EVTCHN_DEV_NAME, O_NONBLOCK|O_RDWR);
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}
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int xc_evtchn_close(int xce_handle)
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{
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return close(xce_handle);
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}
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int xc_evtchn_fd(int xce_handle)
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{
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return xce_handle;
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}
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int xc_evtchn_notify(int xce_handle, evtchn_port_t port)
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{
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struct ioctl_evtchn_notify notify;
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notify.port = port;
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return ioctl(xce_handle, IOCTL_EVTCHN_NOTIFY, ¬ify);
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}
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evtchn_port_or_error_t
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xc_evtchn_bind_interdomain(int xce_handle, int domid,
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evtchn_port_t remote_port)
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{
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struct ioctl_evtchn_bind_interdomain bind;
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int ret;
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bind.remote_domain = domid;
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bind.remote_port = remote_port;
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ret = ioctl(xce_handle, IOCTL_EVTCHN_BIND_INTERDOMAIN, &bind);
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if (ret == 0)
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return bind.port;
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else
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return -1;
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}
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int xc_evtchn_unbind(int xce_handle, evtchn_port_t port)
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{
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struct ioctl_evtchn_unbind unbind;
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unbind.port = port;
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return ioctl(xce_handle, IOCTL_EVTCHN_UNBIND, &unbind);
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}
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evtchn_port_or_error_t
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xc_evtchn_bind_virq(int xce_handle, unsigned int virq)
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{
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struct ioctl_evtchn_bind_virq bind;
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int err;
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bind.virq = virq;
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err = ioctl(xce_handle, IOCTL_EVTCHN_BIND_VIRQ, &bind);
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if (err)
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return -1;
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else
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return bind.port;
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}
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evtchn_port_or_error_t
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xc_evtchn_pending(int xce_handle)
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{
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evtchn_port_t port;
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if ( read_exact(xce_handle, (char *)&port, sizeof(port)) == -1 )
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return -1;
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return port;
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}
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int xc_evtchn_unmask(int xce_handle, evtchn_port_t port)
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{
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return write_exact(xce_handle, (char *)&port, sizeof(port));
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}
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/* Optionally flush file to disk and discard page cache */
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void discard_file_cache(int fd, int flush)
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{
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if ( flush && (fsync(fd) < 0) )
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{
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/*PERROR("Failed to flush file: %s", strerror(errno));*/
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}
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}
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struct grant_entry *xc_gnttab_map_table(int xc_handle, int domid, int *gnt_num)
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{
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return NULL;
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}
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/*
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* Local variables:
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* mode: C
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* c-set-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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