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/* timskmodutils.c
*
* Copyright (C) 2010 - 2013 UNISYS CORPORATION
* All rights reserved.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*/
#include "uniklog.h"
#include "timskmod.h"
#define MYDRVNAME "timskmodutils"
/* s-Par uses the Intel processor's VT-X features to separate groups of
* processors into partitions. The firmware sets the hypervisor bit and
* reports an ID in the HV capabilities leaf so that the partition's OS
* knows s-Par is present and managing the processors.
*/
#define UNISYS_SPAR_LEAF_ID 0x40000000
/* The s-Par leaf ID returns "UnisysSpar64" encoded across ebx, ecx, edx */
#define UNISYS_SPAR_ID_EBX 0x73696e55
#define UNISYS_SPAR_ID_ECX 0x70537379
#define UNISYS_SPAR_ID_EDX 0x34367261
int unisys_spar_platform;
EXPORT_SYMBOL_GPL(unisys_spar_platform);
/** Callers to interfaces that set __GFP_NORETRY flag below
* must check for a NULL (error) result as we are telling the
* kernel interface that it is okay to fail.
*/
void *kmalloc_kernel(size_t siz)
{
return kmalloc(siz, GFP_KERNEL | __GFP_NORETRY);
}
/* Use these handy-dandy seq_file_xxx functions if you want to call some
* functions that write stuff into a seq_file, but you actually just want
* to dump that output into a buffer. Use them as follows:
* - call visor_seq_file_new_buffer to create the seq_file (you supply the buf)
* - call whatever functions you want that take a seq_file as an argument
* (the buf you supplied will get the output data)
* - call visor_seq_file_done_buffer to dispose of your seq_file
*/
struct seq_file *visor_seq_file_new_buffer(void *buf, size_t buf_size)
{
struct seq_file *rc = NULL;
struct seq_file *m = kmalloc_kernel(sizeof(struct seq_file));
if (m == NULL) {
rc = NULL;
goto Away;
}
memset(m, 0, sizeof(struct seq_file));
m->buf = buf;
m->size = buf_size;
rc = m;
Away:
if (rc == NULL) {
visor_seq_file_done_buffer(m);
m = NULL;
}
return rc;
}
EXPORT_SYMBOL_GPL(visor_seq_file_new_buffer);
void visor_seq_file_done_buffer(struct seq_file *m)
{
if (!m)
return;
kfree(m);
}
EXPORT_SYMBOL_GPL(visor_seq_file_done_buffer);
static __init uint32_t
visorutil_spar_detect(void)
{
unsigned int eax, ebx, ecx, edx;
if (cpu_has_hypervisor) {
/* check the ID */
cpuid(UNISYS_SPAR_LEAF_ID, &eax, &ebx, &ecx, &edx);
return (ebx == UNISYS_SPAR_ID_EBX) &&
(ecx == UNISYS_SPAR_ID_ECX) &&
(edx == UNISYS_SPAR_ID_EDX);
} else
return 0;
}
static __init int
visorutil_mod_init(void)
{
if (visorutil_spar_detect()) {
unisys_spar_platform = TRUE;
return 0;
} else
return -ENODEV;
}
static __exit void
visorutil_mod_exit(void)
{
}
module_init(visorutil_mod_init);
module_exit(visorutil_mod_exit);
MODULE_LICENSE("GPL");
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