LXR linux/arch/x86/kernel/bios

   1/*
   2 * BIOS run time interface routines.
   3 *
   4 *  This program is free software; you can redistribute it and/or modify
   5 *  it under the terms of the GNU General Public License as published by
   6 *  the Free Software Foundation; either version 2 of the License, or
   7 *  (at your option) any later version.
   8 *
   9 *  This program is distributed in the hope that it will be useful,
  10 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 *  GNU General Public License for more details.
  13 *
  14 *  You should have received a copy of the GNU General Public License
  15 *  along with this program; if not, write to the Free Software
  16 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  17 *
  18 *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
  19 *  Copyright (c) Russ Anderson
  20 */
  21
  22#include <linux/efi.h>
  23#include <asm/efi.h>
  24#include <linux/io.h>
  25#include <asm/uv/bios.h>
  26#include <asm/uv/uv_hub.h>
  27
  28struct uv_systab uv_systab;
  29
  30s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
  31{
  32        struct uv_systab *tab = &uv_systab;
  33
  34        if (!tab->function)
  35                /*
  36                 * BIOS does not support UV systab
  37                 */
  38                return BIOS_STATUS_UNIMPLEMENTED;
  39
  40        return efi_call6((void *)__va(tab->function),
  41                                        (u64)which, a1, a2, a3, a4, a5);
  42}
  43
  44s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
  45                                        u64 a4, u64 a5)
  46{
  47        unsigned long bios_flags;
  48        s64 ret;
  49
  50        local_irq_save(bios_flags);
  51        ret = uv_bios_call(which, a1, a2, a3, a4, a5);
  52        local_irq_restore(bios_flags);
  53
  54        return ret;
  55}
  56
  57s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
  58                                        u64 a4, u64 a5)
  59{
  60        s64 ret;
  61
  62        preempt_disable();
  63        ret = uv_bios_call(which, a1, a2, a3, a4, a5);
  64        preempt_enable();
  65
  66        return ret;
  67}
  68
  69
  70long sn_partition_id;
  71EXPORT_SYMBOL_GPL(sn_partition_id);
  72long uv_coherency_id;
  73EXPORT_SYMBOL_GPL(uv_coherency_id);
  74long uv_region_size;
  75EXPORT_SYMBOL_GPL(uv_region_size);
  76int uv_type;
  77
  78
  79s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher,
  80                long *region)
  81{
  82        s64 ret;
  83        u64 v0, v1;
  84        union partition_info_u part;
  85
  86        ret = uv_bios_call_irqsave(UV_BIOS_GET_SN_INFO, fc,
  87                                (u64)(&v0), (u64)(&v1), 0, 0);
  88        if (ret != BIOS_STATUS_SUCCESS)
  89                return ret;
  90
  91        part.val = v0;
  92        if (uvtype)
  93                *uvtype = part.hub_version;
  94        if (partid)
  95                *partid = part.partition_id;
  96        if (coher)
  97                *coher = part.coherence_id;
  98        if (region)
  99                *region = part.region_size;
 100        return ret;
 101}
 102
 103
 104s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second)
 105{
 106        return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
 107                           (u64)ticks_per_second, 0, 0, 0);
 108}
 109EXPORT_SYMBOL_GPL(uv_bios_freq_base);
 110
 111
 112#ifdef CONFIG_EFI
 113void uv_bios_init(void)
 114{
 115        struct uv_systab *tab;
 116
 117        if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) ||
 118            (efi.uv_systab == (unsigned long)NULL)) {
 119                printk(KERN_CRIT "No EFI UV System Table.\n");
 120                uv_systab.function = (unsigned long)NULL;
 121                return;
 122        }
 123
 124        tab = (struct uv_systab *)ioremap(efi.uv_systab,
 125                                        sizeof(struct uv_systab));
 126        if (strncmp(tab->signature, "UVST", 4) != 0)
 127                printk(KERN_ERR "bad signature in UV system table!");
 128
 129        /*
 130         * Copy table to permanent spot for later use.
 131         */
 132        memcpy(&uv_systab, tab, sizeof(struct uv_systab));
 133        iounmap(tab);
 134
 135        printk(KERN_INFO "EFI UV System Table Revision %d\n", tab->revision);
 136}
 137#else   /* !CONFIG_EFI */
 138
 139void uv_bios_init(void) { }
 140#endif
 141
 142