![Ken Cox](/assets/img/avatar_default.png)
The visorutil module was lacking license info. Signed-off-by: Ken Cox <jkc@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
/* timskmodutils.c
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*
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* Copyright (C) 2010 - 2013 UNISYS CORPORATION
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*/
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#include "uniklog.h"
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#include "timskmod.h"
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#define MYDRVNAME "timskmodutils"
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/* s-Par uses the Intel processor's VT-X features to separate groups of
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* processors into partitions. The firmware sets the hypervisor bit and
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* reports an ID in the HV capabilities leaf so that the partition's OS
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* knows s-Par is present and managing the processors.
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*/
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#define UNISYS_SPAR_LEAF_ID 0x40000000
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/* The s-Par leaf ID returns "UnisysSpar64" encoded across ebx, ecx, edx */
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#define UNISYS_SPAR_ID_EBX 0x73696e55
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#define UNISYS_SPAR_ID_ECX 0x70537379
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#define UNISYS_SPAR_ID_EDX 0x34367261
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int unisys_spar_platform;
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EXPORT_SYMBOL_GPL(unisys_spar_platform);
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/** Callers to interfaces that set __GFP_NORETRY flag below
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* must check for a NULL (error) result as we are telling the
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* kernel interface that it is okay to fail.
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*/
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void *kmalloc_kernel(size_t siz)
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{
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return kmalloc(siz, GFP_KERNEL | __GFP_NORETRY);
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}
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/* Use these handy-dandy seq_file_xxx functions if you want to call some
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* functions that write stuff into a seq_file, but you actually just want
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* to dump that output into a buffer. Use them as follows:
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* - call visor_seq_file_new_buffer to create the seq_file (you supply the buf)
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* - call whatever functions you want that take a seq_file as an argument
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* (the buf you supplied will get the output data)
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* - call visor_seq_file_done_buffer to dispose of your seq_file
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*/
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struct seq_file *visor_seq_file_new_buffer(void *buf, size_t buf_size)
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{
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struct seq_file *rc = NULL;
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struct seq_file *m = kmalloc_kernel(sizeof(struct seq_file));
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if (m == NULL) {
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rc = NULL;
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goto Away;
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}
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memset(m, 0, sizeof(struct seq_file));
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m->buf = buf;
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m->size = buf_size;
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rc = m;
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Away:
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if (rc == NULL) {
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visor_seq_file_done_buffer(m);
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m = NULL;
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}
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return rc;
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}
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EXPORT_SYMBOL_GPL(visor_seq_file_new_buffer);
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void visor_seq_file_done_buffer(struct seq_file *m)
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{
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if (!m)
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return;
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kfree(m);
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}
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EXPORT_SYMBOL_GPL(visor_seq_file_done_buffer);
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static __init uint32_t
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visorutil_spar_detect(void)
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{
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unsigned int eax, ebx, ecx, edx;
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if (cpu_has_hypervisor) {
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/* check the ID */
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cpuid(UNISYS_SPAR_LEAF_ID, &eax, &ebx, &ecx, &edx);
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return (ebx == UNISYS_SPAR_ID_EBX) &&
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(ecx == UNISYS_SPAR_ID_ECX) &&
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(edx == UNISYS_SPAR_ID_EDX);
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} else
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return 0;
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}
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static __init int
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visorutil_mod_init(void)
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{
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if (visorutil_spar_detect()) {
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unisys_spar_platform = TRUE;
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return 0;
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} else
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return -ENODEV;
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}
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static __exit void
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visorutil_mod_exit(void)
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{
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}
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module_init(visorutil_mod_init);
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module_exit(visorutil_mod_exit);
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MODULE_LICENSE("GPL");
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