| /* 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"); |