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grant_table.c
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grant_table.c
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/**
* @file common/grant_table.c
*
* A driver for the Xen Grant Table interface.
*/
#include <xtf/grant_table.h>
#include <xtf/lib.h>
uint8_t gnttab_raw[] __page_aligned_bss;
extern grant_entry_v1_t gnttab_v1[] __alias("gnttab_raw");
extern grant_entry_v2_t gnttab_v2[] __alias("gnttab_raw");
const char *gntst_strerror(int err)
{
static const char *const errstr[] = GNTTABOP_error_msgs;
unsigned int idx = -err;
return idx < ARRAY_SIZE(errstr) ? errstr[idx] : "unknown";
}
int xtf_init_grant_table(unsigned int version)
{
int rc = 0;
static bool set_version_unavailable;
if ( !set_version_unavailable )
{
struct gnttab_set_version ver = { version };
rc = hypercall_grant_table_op(GNTTABOP_set_version, &ver, 1);
if ( rc == -ENOSYS )
/* Hypercall unavailable on older versions of Xen. */
set_version_unavailable = true;
else if ( rc )
{
printk("%s() GNTTABOP_set_version failed: rc %d\n", __func__, rc);
return -EIO;
}
}
if ( set_version_unavailable && version != 1 )
/* Sufficiently old Xen which only knows about gnttab v1. */
return -ENODEV;
static bool gnttab_mapped;
if ( !gnttab_mapped )
{
rc = arch_map_gnttab();
if ( !rc )
gnttab_mapped = true;
}
return rc;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/