[Xen-ia64-devel] [PATCH 06/17] ia64/pv_ops: add an early setup hook for pv_ops.

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

This patch adds a setup hook in the very early boot sequence
before start_kernel() to initialize paravirtualization stuff.
The hook will be set by each pv loader code or by using multi entry point.

Signed-off-by: Qing He <qing.he@xxxxxxxxx>
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 arch/ia64/kernel/head.S     |   41 +++++++++++++++++++++++++++++++++++++++++
 include/asm-ia64/paravirt.h |    3 +++
 2 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/arch/ia64/kernel/head.S b/arch/ia64/kernel/head.S
index ddeab4e..db540e5 100644
--- a/arch/ia64/kernel/head.S
+++ b/arch/ia64/kernel/head.S
@@ -26,11 +26,14 @@
 #include <asm/mmu_context.h>
 #include <asm/asm-offsets.h>
 #include <asm/pal.h>
+#include <asm/paravirt.h>
 #include <asm/pgtable.h>
 #include <asm/processor.h>
 #include <asm/ptrace.h>
 #include <asm/system.h>
 #include <asm/mca_asm.h>
+#include <linux/init.h>
+#include <linux/linkage.h>
 
 #ifdef CONFIG_HOTPLUG_CPU
 #define SAL_PSR_BITS_TO_SET                            \
@@ -367,6 +370,44 @@ start_ap:
        ;;
 (isBP) st8 [r2]=r28            // save the address of the boot param area 
passed by the bootloader
 
+#ifdef CONFIG_PARAVIRT
+
+       movl r14=hypervisor_setup_hooks
+       movl r15=hypervisor_type
+       mov r16=num_hypervisor_hooks
+       ;;
+       ld8 r2=[r15]
+       ;;
+       cmp.ltu p7,p0=r2,r16    // array size check
+       shladd r8=r2,3,r14
+       ;;
+(p7)   ld8 r9=[r8]
+       ;;
+(p7)   mov b1=r9
+(p7)   cmp.ne.unc p7,p0=r9,r0  // no actual branch to NULL
+       ;;
+(p7)   br.call.sptk.many rp=b1
+
+       __INITDATA
+
+default_setup_hook = 0         // Currently nothing needs to be done.
+
+       .weak xen_setup_hook
+
+       .global hypervisor_type
+hypervisor_type:
+       data8           PARAVIRT_HYPERVISOR_TYPE_DEFAULT
+
+       // must have the same order with PARAVIRT_HYPERVISOR_TYPE_xxx
+
+hypervisor_setup_hooks:
+       data8           default_setup_hook
+       data8           xen_setup_hook
+num_hypervisor_hooks = (. - hypervisor_setup_hooks) / 8
+       .previous
+
+#endif
+
 #ifdef CONFIG_SMP
 (isAP) br.call.sptk.many rp=start_secondary
 .ret0:
diff --git a/include/asm-ia64/paravirt.h b/include/asm-ia64/paravirt.h
index 26b4334..1032b21 100644
--- a/include/asm-ia64/paravirt.h
+++ b/include/asm-ia64/paravirt.h
@@ -26,6 +26,9 @@
 
 #ifdef CONFIG_PARAVIRT_GUEST
 
+#define PARAVIRT_HYPERVISOR_TYPE_DEFAULT       0
+#define PARAVIRT_HYPERVISOR_TYPE_XEN           1
+
 #ifndef __ASSEMBLY__
 
 #include <asm/hw_irq.h>
-- 
1.5.3


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