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[IA64] pvops: add an early setup hook for pv_ops.

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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@intel.com>
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Isaku Yamahata 2008-05-19 22:13:33 +09:00 committed by Tony Luck
parent 90aeb169c0
commit 3e0879deb7
2 changed files with 44 additions and 0 deletions
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41
arch/ia64/kernel/head.S
View file

@ -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:

3
include/asm-ia64/paravirt.h
View file

@ -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>