x86: Add UV bios call infrastructure v4

Add the EFI callback function and associated wrapper code.
Initialize SAL system table entry info at boot time.

Signed-off-by: Russ Anderson <rja@sgi.com>
Signed-off-by: Paul Jackson <pj@sgi.com>
Acked-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 81 insertions, 21 deletions

diff --git a/arch/x86/kernel/bios_uv.c b/arch/x86/kernel/bios_uv.c
index fdd585f9c53..5481eb59f78 100644
--- 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
+
diff --git a/arch/x86/kernel/genx2apic_uv_x.c b/arch/x86/kernel/genx2apic_uv_x.c
index b689075bbe2..aa2e5e15bf6 100644
--- a/arch/x86/kernel/genx2apic_uv_x.c
+++ b/arch/x86/kernel/genx2apic_uv_x.c
@@ -427,6 +427,7 @@ void __init uv_system_init(void)
         gnode_upper = (((unsigned long)node_id.s.node_id) &
                        ~((1 << n_val) - 1)) << m_val;
 
+        uv_bios_init();
         uv_rtc_init();
 
         for_each_present_cpu(cpu) {