108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
/*
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* BIOS run time interface routines.
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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
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* (at 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
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* Copyright (c) Russ Anderson
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*/
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#include <linux/efi.h>
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#include <asm/efi.h>
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#include <linux/io.h>
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#include <asm/uv/bios.h>
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struct uv_systab uv_systab;
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s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
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{
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struct uv_systab *tab = &uv_systab;
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if (!tab->function)
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/*
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* BIOS does not support UV systab
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*/
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return BIOS_STATUS_UNIMPLEMENTED;
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return efi_call6((void *)__va(tab->function),
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(u64)which, a1, a2, a3, a4, a5);
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}
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s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
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u64 a4, u64 a5)
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{
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unsigned long bios_flags;
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s64 ret;
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local_irq_save(bios_flags);
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ret = uv_bios_call(which, a1, a2, a3, a4, a5);
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local_irq_restore(bios_flags);
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return ret;
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}
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s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
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u64 a4, u64 a5)
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{
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s64 ret;
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preempt_disable();
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ret = uv_bios_call(which, a1, a2, a3, a4, a5);
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preempt_enable();
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return ret;
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}
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long
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x86_bios_freq_base(unsigned long clock_type, unsigned long *ticks_per_second,
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unsigned long *drift_info)
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{
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return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
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(u64)ticks_per_second, 0, 0, 0);
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}
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EXPORT_SYMBOL_GPL(x86_bios_freq_base);
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#ifdef CONFIG_EFI
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void uv_bios_init(void)
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{
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struct uv_systab *tab;
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if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) ||
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(efi.uv_systab == (unsigned long)NULL)) {
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printk(KERN_CRIT "No EFI UV System Table.\n");
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uv_systab.function = (unsigned long)NULL;
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return;
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}
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tab = (struct uv_systab *)ioremap(efi.uv_systab,
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sizeof(struct uv_systab));
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if (strncmp(tab->signature, "UVST", 4) != 0)
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printk(KERN_ERR "bad signature in UV system table!");
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/*
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* Copy table to permanent spot for later use.
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*/
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memcpy(&uv_systab, tab, sizeof(struct uv_systab));
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iounmap(tab);
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printk(KERN_INFO "EFI UV System Table Revision %d\n", tab->revision);
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}
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#else /* !CONFIG_EFI */
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void uv_bios_init(void) { }
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#endif
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