[Xen-ia64-devel] [PATCH 33/50] ia64/xen: detect xen environment at early boot time and do minimal initialization.

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

Currently it detects by checking psr.cpl != 0.
It's ok for now, but more abstraction would be needed later like x86.
Presumably extending booting protocol (i.e. extending struct ia64_boot_param)
or multi entry points depending on hypervisor would be necessary.

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 arch/ia64/kernel/head.S           |    6 ++++
 arch/ia64/xen/xensetup.S          |   40 +++++++++++++++++++++++++++
 include/asm-ia64/xen/hypervisor.h |   55 +++++++++++++++++++++++++++++++++++++
 3 files changed, 101 insertions(+), 0 deletions(-)
 create mode 100644 arch/ia64/xen/xensetup.S
 create mode 100644 include/asm-ia64/xen/hypervisor.h

diff --git a/arch/ia64/kernel/head.S b/arch/ia64/kernel/head.S
index d3a41d5..2f8d770 100644
--- a/arch/ia64/kernel/head.S
+++ b/arch/ia64/kernel/head.S
@@ -367,6 +367,12 @@ start_ap:
        ;;
 (isBP) st8 [r2]=r28            // save the address of the boot param area 
passed by the bootloader
 
+#ifdef CONFIG_XEN
+       //  Note: isBP is used by the subprogram.
+       br.call.sptk.many rp=early_xen_setup
+       ;;
+#endif
+
 #ifdef CONFIG_SMP
 (isAP) br.call.sptk.many rp=start_secondary
 .ret0:
diff --git a/arch/ia64/xen/xensetup.S b/arch/ia64/xen/xensetup.S
new file mode 100644
index 0000000..17ad297
--- /dev/null
+++ b/arch/ia64/xen/xensetup.S
@@ -0,0 +1,40 @@
+/*
+ * Support routines for Xen
+ *
+ * Copyright (C) 2005 Dan Magenheimer <dan.magenheimer@xxxxxx>
+ */
+
+#include <asm/processor.h>
+#include <asm/asmmacro.h>
+
+       .section .data.read_mostly
+       .align 8
+       .global running_on_xen
+running_on_xen:
+       data4 0
+       .previous
+
+#define isBP   p3      // are we the Bootstrap Processor?
+
+       .text
+GLOBAL_ENTRY(early_xen_setup)
+       mov r8=ar.rsc           // Initialized in head.S
+(isBP) movl r9=running_on_xen;;
+       extr.u r8=r8,2,2;;      // Extract pl fields
+       cmp.eq p7,p0=r8,r0      // p7: !running on xen
+       mov r8=1                // booleanize.
+(p7)   br.ret.sptk.many rp;;
+(isBP) st4 [r9]=r8
+       movl r10=xen_ivt;;
+
+       mov cr.iva=r10
+
+       /* Set xsi base.  */
+#define FW_HYPERCALL_SET_SHARED_INFO_VA                        0x600
+(isBP) mov r2=FW_HYPERCALL_SET_SHARED_INFO_VA
+(isBP) movl r28=XSI_BASE;;
+(isBP) break 0x1000;;
+
+       br.ret.sptk.many rp
+       ;;
+END(early_xen_setup)
diff --git a/include/asm-ia64/xen/hypervisor.h 
b/include/asm-ia64/xen/hypervisor.h
new file mode 100644
index 0000000..78c5635
--- /dev/null
+++ b/include/asm-ia64/xen/hypervisor.h
@@ -0,0 +1,55 @@
+/******************************************************************************
+ * hypervisor.h
+ *
+ * Linux-specific hypervisor handling.
+ *
+ * Copyright (c) 2002-2004, K A Fraser
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef _ASM_IA64_XEN_HYPERVISOR_H
+#define _ASM_IA64_XEN_HYPERVISOR_H
+
+#ifdef CONFIG_XEN
+/* running_on_xen is set before executing any C code by early_xen_setup */
+extern const int running_on_xen;
+#define is_running_on_xen()                    (running_on_xen)
+#else /* CONFIG_XEN */
+# ifdef CONFIG_VMX_GUEST
+#  define is_running_on_xen()                  (1)
+# else /* CONFIG_VMX_GUEST */
+#  define is_running_on_xen()                  (0)
+# endif /* CONFIG_VMX_GUEST */
+#endif /* CONFIG_XEN */
+
+#ifdef CONFIG_XEN_PRIVILEGED_GUEST
+#define is_initial_xendomain()                                         \
+       (is_running_on_xen() ? xen_start_info->flags & SIF_INITDOMAIN : 0)
+#else
+#define is_initial_xendomain() 0
+#endif
+
+#endif /* _ASM_IA64_XEN_HYPERVISOR_H */
-- 
1.5.3


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