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/*
* Copyright (C) 2006 Hollis Blanchard <hollisb@us.ibm.com>, IBM Corporation
* Tristan Gingold <tristan.gingold@bull.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* This code is mostly taken from ia64-xen files xcom_mini.c and xencomm.c.
* Changes: Dietmar Hahn <dietmar.hahn@fujitsu-siemens.com
*/
#include <os.h>
#include <hypervisor.h>
#include <xen/xencomm.h>
#include <xen/grant_table.h>
#define XENCOMM_MINI_ADDRS 3
struct xencomm_mini
{
struct xencomm_desc _desc;
uint64_t address[XENCOMM_MINI_ADDRS];
};
#define xen_guest_handle(hnd) ((hnd).p)
/* Translate virtual address to physical address. */
uint64_t
xencomm_vaddr_to_paddr(uint64_t vaddr)
{
if (IA64_RR_EXTR(vaddr) == 5)
return KERN_VIRT_2_PHYS(vaddr);
if (IA64_RR_EXTR(vaddr) == 7)
return __pa(vaddr);
return 0;
}
#define min(a,b) (((a) < (b)) ? (a) : (b))
static int
xencomm_init_desc(struct xencomm_desc *desc, void *buffer, unsigned long bytes)
{
unsigned long recorded = 0;
int i = 0;
if ((buffer == NULL) && (bytes > 0))
BUG();
/* record the physical pages used */
if (buffer == NULL)
desc->nr_addrs = 0;
while ((recorded < bytes) && (i < desc->nr_addrs)) {
unsigned long vaddr = (unsigned long)buffer + recorded;
unsigned long paddr;
int offset;
int chunksz;
offset = vaddr % PAGE_SIZE; /* handle partial pages */
chunksz = min(PAGE_SIZE - offset, bytes - recorded);
paddr = xencomm_vaddr_to_paddr(vaddr);
if (paddr == ~0UL) {
printk("%s: couldn't translate vaddr %lx\n",
__func__, vaddr);
return -EINVAL;
}
desc->address[i++] = SWAP(paddr);
recorded += chunksz;
}
if (recorded < bytes) {
printk("%s: could only translate %ld of %ld bytes\n",
__func__, recorded, bytes);
return -ENOSPC;
}
/* mark remaining addresses invalid (just for safety) */
while (i < desc->nr_addrs)
desc->address[i++] = SWAP(XENCOMM_INVALID);
desc->magic = SWAP(XENCOMM_MAGIC);
return 0;
}
static void *
xencomm_alloc_mini(struct xencomm_mini *area, int *nbr_area)
{
unsigned long base;
unsigned int pageoffset;
while (*nbr_area >= 0) {
/* Allocate an area. */
(*nbr_area)--;
base = (unsigned long)(area + *nbr_area);
pageoffset = base % PAGE_SIZE;
/* If the area does not cross a page, use it. */
if ((PAGE_SIZE - pageoffset) >= sizeof(struct xencomm_mini))
return &area[*nbr_area];
}
/* No more area. */
return NULL;
}
int
xencomm_create_mini(struct xencomm_mini *area, int *nbr_area,
void *buffer, unsigned long bytes,
struct xencomm_handle **ret)
{
struct xencomm_desc *desc;
int rc;
unsigned long res;
desc = xencomm_alloc_mini(area, nbr_area);
if (!desc)
return -ENOMEM;
desc->nr_addrs = XENCOMM_MINI_ADDRS;
rc = xencomm_init_desc(desc, buffer, bytes);
if (rc)
return rc;
res = xencomm_vaddr_to_paddr((unsigned long)desc);
if (res == ~0UL)
return -EINVAL;
*ret = (struct xencomm_handle*)res;
return 0;
}
static int
xencommize_mini_grant_table_op(struct xencomm_mini *xc_area, int *nbr_area,
unsigned int cmd, void *op, unsigned int count,
struct xencomm_handle **desc)
{
struct xencomm_handle *desc1;
unsigned int argsize=0;
int rc;
switch (cmd) {
case GNTTABOP_map_grant_ref:
argsize = sizeof(struct gnttab_map_grant_ref);
break;
case GNTTABOP_unmap_grant_ref:
argsize = sizeof(struct gnttab_unmap_grant_ref);
break;
case GNTTABOP_setup_table:
{
struct gnttab_setup_table *setup = op;
argsize = sizeof(*setup);
if (count != 1)
return -EINVAL;
rc = xencomm_create_mini
(xc_area, nbr_area,
(void*)SWAP((uint64_t)
xen_guest_handle(setup->frame_list)),
SWAP(setup->nr_frames)
* sizeof(*xen_guest_handle(setup->frame_list)),
&desc1);
if (rc)
return rc;
set_xen_guest_handle(setup->frame_list,
(void *)SWAP((uint64_t)desc1));
break;
}
case GNTTABOP_dump_table:
argsize = sizeof(struct gnttab_dump_table);
break;
case GNTTABOP_transfer:
argsize = sizeof(struct gnttab_transfer);
break;
case GNTTABOP_copy:
argsize = sizeof(struct gnttab_copy);
break;
default:
printk("%s: unknown mini grant table op %d\n", __func__, cmd);
BUG();
}
rc = xencomm_create_mini(xc_area, nbr_area, op, count * argsize, desc);
return rc;
}
int
xencomm_mini_hypercall_grant_table_op(unsigned int cmd, void *op,
unsigned int count)
{
int rc;
struct xencomm_handle *desc;
int nbr_area = 2;
struct xencomm_mini xc_area[2];
rc = xencommize_mini_grant_table_op(xc_area, &nbr_area,
cmd, op, count, &desc);
if (rc)
return rc;
return xencomm_arch_hypercall_grant_table_op(cmd, desc, count);
}
static void
gnttab_map_grant_ref_pre(struct gnttab_map_grant_ref *uop)
{
uint32_t flags;
flags = uop->flags;
if (flags & GNTMAP_host_map) {
if (flags & GNTMAP_application_map) {
printk("GNTMAP_application_map is not supported yet: "
"flags 0x%x\n", flags);
BUG();
}
if (flags & GNTMAP_contains_pte) {
printk("GNTMAP_contains_pte is not supported yet flags "
"0x%x\n", flags);
BUG();
}
} else if (flags & GNTMAP_device_map) {
printk("GNTMAP_device_map is not supported yet 0x%x\n", flags);
BUG();//XXX not yet. actually this flag is not used.
} else {
BUG();
}
}
int
HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
{
if (cmd == GNTTABOP_map_grant_ref) {
unsigned int i;
for (i = 0; i < count; i++) {
gnttab_map_grant_ref_pre(
(struct gnttab_map_grant_ref*)uop + i);
}
}
return xencomm_mini_hypercall_grant_table_op(cmd, uop, count);
}
/* In fw.S */
extern int xencomm_arch_hypercall_suspend(struct xencomm_handle *arg);
int
HYPERVISOR_suspend(unsigned long srec)
{
struct sched_shutdown arg;
arg.reason = (uint32_t)SWAP((uint32_t)SHUTDOWN_suspend);
return xencomm_arch_hypercall_suspend(xencomm_create_inline(&arg));
}
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