ARM: mmp: fix potential NULL dereference
[linux/fpc-iii.git] / arch / x86 / platform / uv / bios_uv.c
blob766612137a62d55c6b328f1b3c30807d298a50ac
1 /*
2 * BIOS run time interface routines.
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.
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.
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
18 * Copyright (c) 2008-2009 Silicon Graphics, Inc. All Rights Reserved.
19 * Copyright (c) Russ Anderson <rja@sgi.com>
22 #include <linux/efi.h>
23 #include <linux/export.h>
24 #include <asm/efi.h>
25 #include <linux/io.h>
26 #include <asm/uv/bios.h>
27 #include <asm/uv/uv_hub.h>
29 static struct uv_systab uv_systab;
31 s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
33 struct uv_systab *tab = &uv_systab;
34 s64 ret;
36 if (!tab->function)
38 * BIOS does not support UV systab
40 return BIOS_STATUS_UNIMPLEMENTED;
42 ret = efi_call6((void *)__va(tab->function), (u64)which,
43 a1, a2, a3, a4, a5);
44 return ret;
46 EXPORT_SYMBOL_GPL(uv_bios_call);
48 s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
49 u64 a4, u64 a5)
51 unsigned long bios_flags;
52 s64 ret;
54 local_irq_save(bios_flags);
55 ret = uv_bios_call(which, a1, a2, a3, a4, a5);
56 local_irq_restore(bios_flags);
58 return ret;
61 s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
62 u64 a4, u64 a5)
64 s64 ret;
66 preempt_disable();
67 ret = uv_bios_call(which, a1, a2, a3, a4, a5);
68 preempt_enable();
70 return ret;
74 long sn_partition_id;
75 EXPORT_SYMBOL_GPL(sn_partition_id);
76 long sn_coherency_id;
77 EXPORT_SYMBOL_GPL(sn_coherency_id);
78 long sn_region_size;
79 EXPORT_SYMBOL_GPL(sn_region_size);
80 long system_serial_number;
81 EXPORT_SYMBOL_GPL(system_serial_number);
82 int uv_type;
83 EXPORT_SYMBOL_GPL(uv_type);
86 s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher,
87 long *region, long *ssn)
89 s64 ret;
90 u64 v0, v1;
91 union partition_info_u part;
93 ret = uv_bios_call_irqsave(UV_BIOS_GET_SN_INFO, fc,
94 (u64)(&v0), (u64)(&v1), 0, 0);
95 if (ret != BIOS_STATUS_SUCCESS)
96 return ret;
98 part.val = v0;
99 if (uvtype)
100 *uvtype = part.hub_version;
101 if (partid)
102 *partid = part.partition_id;
103 if (coher)
104 *coher = part.coherence_id;
105 if (region)
106 *region = part.region_size;
107 if (ssn)
108 *ssn = v1;
109 return ret;
111 EXPORT_SYMBOL_GPL(uv_bios_get_sn_info);
114 uv_bios_mq_watchlist_alloc(unsigned long addr, unsigned int mq_size,
115 unsigned long *intr_mmr_offset)
117 u64 watchlist;
118 s64 ret;
121 * bios returns watchlist number or negative error number.
123 ret = (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_ALLOC, addr,
124 mq_size, (u64)intr_mmr_offset,
125 (u64)&watchlist, 0);
126 if (ret < BIOS_STATUS_SUCCESS)
127 return ret;
129 return watchlist;
131 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_alloc);
134 uv_bios_mq_watchlist_free(int blade, int watchlist_num)
136 return (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_FREE,
137 blade, watchlist_num, 0, 0, 0);
139 EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_free);
142 uv_bios_change_memprotect(u64 paddr, u64 len, enum uv_memprotect perms)
144 return uv_bios_call_irqsave(UV_BIOS_MEMPROTECT, paddr, len,
145 perms, 0, 0);
147 EXPORT_SYMBOL_GPL(uv_bios_change_memprotect);
150 uv_bios_reserved_page_pa(u64 buf, u64 *cookie, u64 *addr, u64 *len)
152 s64 ret;
154 ret = uv_bios_call_irqsave(UV_BIOS_GET_PARTITION_ADDR, (u64)cookie,
155 (u64)addr, buf, (u64)len, 0);
156 return ret;
158 EXPORT_SYMBOL_GPL(uv_bios_reserved_page_pa);
160 s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second)
162 return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
163 (u64)ticks_per_second, 0, 0, 0);
165 EXPORT_SYMBOL_GPL(uv_bios_freq_base);
168 * uv_bios_set_legacy_vga_target - Set Legacy VGA I/O Target
169 * @decode: true to enable target, false to disable target
170 * @domain: PCI domain number
171 * @bus: PCI bus number
173 * Returns:
174 * 0: Success
175 * -EINVAL: Invalid domain or bus number
176 * -ENOSYS: Capability not available
177 * -EBUSY: Legacy VGA I/O cannot be retargeted at this time
179 int uv_bios_set_legacy_vga_target(bool decode, int domain, int bus)
181 return uv_bios_call(UV_BIOS_SET_LEGACY_VGA_TARGET,
182 (u64)decode, (u64)domain, (u64)bus, 0, 0);
184 EXPORT_SYMBOL_GPL(uv_bios_set_legacy_vga_target);
187 #ifdef CONFIG_EFI
188 void uv_bios_init(void)
190 struct uv_systab *tab;
192 if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) ||
193 (efi.uv_systab == (unsigned long)NULL)) {
194 printk(KERN_CRIT "No EFI UV System Table.\n");
195 uv_systab.function = (unsigned long)NULL;
196 return;
199 tab = (struct uv_systab *)ioremap(efi.uv_systab,
200 sizeof(struct uv_systab));
201 if (strncmp(tab->signature, "UVST", 4) != 0)
202 printk(KERN_ERR "bad signature in UV system table!");
205 * Copy table to permanent spot for later use.
207 memcpy(&uv_systab, tab, sizeof(struct uv_systab));
208 iounmap(tab);
210 printk(KERN_INFO "EFI UV System Table Revision %d\n",
211 uv_systab.revision);
213 #else /* !CONFIG_EFI */
215 void uv_bios_init(void) { }
216 #endif