x86: Add UV bios call infrastructure v4

[linux-2.6-omap-h63xx.git] / arch / x86 / kernel / bios_uv.c

diff --git a/arch/x86/kernel/bios_uv.c b/arch/x86/kernel/bios_uv.c
index fdd585f9c53dd371d41392b4e955278d913979f0..5481eb59f783ef21c4fcbf0b444b419ec8360d94 100644 (file)
--- a/arch/x86/kernel/bios_uv.c
+++ b/arch/x86/kernel/bios_uv.c
@@ -1,8 +1,6 @@
 /*
  * BIOS run time interface routines.
  *
- *  Copyright (c) 2008 Silicon Graphics, Inc.  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
@@ -16,33 +14,94 @@
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
+ *  Copyright (c) Russ Anderson
  */
 
+#include <linux/efi.h>
+#include <asm/efi.h>
+#include <linux/io.h>
 #include <asm/uv/bios.h>
 
-const char *
-x86_bios_strerror(long status)
+struct uv_systab uv_systab;
+
+s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
 {
-       const char *str;
-       switch (status) {
-       case  0: str = "Call completed without error";  break;
-       case -1: str = "Not implemented";               break;
-       case -2: str = "Invalid argument";              break;
-       case -3: str = "Call completed with error";     break;
-       default: str = "Unknown BIOS status code";      break;
-       }
-       return str;
+       struct uv_systab *tab = &uv_systab;
+
+       if (!tab->function)
+               /*
+                * BIOS does not support UV systab
+                */
+               return BIOS_STATUS_UNIMPLEMENTED;
+
+       return efi_call6((void *)__va(tab->function),
+                                       (u64)which, a1, a2, a3, a4, a5);
 }
 
-long
-x86_bios_freq_base(unsigned long which, unsigned long *ticks_per_second,
-                  unsigned long *drift_info)
+s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
+                                       u64 a4, u64 a5)
 {
-       struct uv_bios_retval isrv;
+       unsigned long bios_flags;
+       s64 ret;
+
+       local_irq_save(bios_flags);
+       ret = uv_bios_call(which, a1, a2, a3, a4, a5);
+       local_irq_restore(bios_flags);
+
+       return ret;
+}
+
+s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
+                                       u64 a4, u64 a5)
+{
+       s64 ret;
+
+       preempt_disable();
+       ret = uv_bios_call(which, a1, a2, a3, a4, a5);
+       preempt_enable();
 
-       BIOS_CALL(isrv, BIOS_FREQ_BASE, which, 0, 0, 0, 0, 0, 0);
-       *ticks_per_second = isrv.v0;
-       *drift_info = isrv.v1;
-       return isrv.status;
+       return ret;
+}
+
+long
+x86_bios_freq_base(unsigned long clock_type, unsigned long *ticks_per_second,
+                                       unsigned long *drift_info)
+{
+       return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
+                               (u64)ticks_per_second, 0, 0, 0);
 }
 EXPORT_SYMBOL_GPL(x86_bios_freq_base);
+
+
+#ifdef CONFIG_EFI
+void uv_bios_init(void)
+{
+       struct uv_systab *tab;
+
+       if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) ||
+           (efi.uv_systab == (unsigned long)NULL)) {
+               printk(KERN_CRIT "No EFI UV System Table.\n");
+               uv_systab.function = (unsigned long)NULL;
+               return;
+       }
+
+       tab = (struct uv_systab *)ioremap(efi.uv_systab,
+                                       sizeof(struct uv_systab));
+       if (strncmp(tab->signature, "UVST", 4) != 0)
+               printk(KERN_ERR "bad signature in UV system table!");
+
+       /*
+        * Copy table to permanent spot for later use.
+        */
+       memcpy(&uv_systab, tab, sizeof(struct uv_systab));
+       iounmap(tab);
+
+       printk(KERN_INFO "EFI UV System Table Revision %d\n", tab->revision);
+}
+#else  /* !CONFIG_EFI */
+
+void uv_bios_init(void) { }
+#endif
+