[Xen-ia64-devel] [patch 10/11] ia64: kexec: add __va_efi

[Simon Horman <horms@xxxxxxxxxxxx>]

sal_desc_entry_point() converts physical addresses into virtual
addresses using __va() and these virtual addresses are used
to register the SAL and PAL handlers - which exist in firmware
memory.

As the mapping of firmware memory is being moved from
a PAGE_OFFSET of (0xf << 60) to a PAGE_OFFSET of (0xe << 60),
__va() does not provide the correct virtual address.

By adding __va_efi(), which uses EFI_PAGE_OFFSET=(0xe << 60),
and using this in sal_desc_entry_point(), the correct address is
used.

On an HP rx2600 this eliminates the problem where the SAL rendezvous address
can't be registered and subsequently the boot fails. I suspect it
solves similar problems that have been seen on other HP machines too.

Actually, its rather amazing that the HP rx2620 and Tiger2 that
I have been using work without this fix.

Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>

Index: xen-unstable.hg/xen/arch/ia64/linux-xen/sal.c
===================================================================
--- xen-unstable.hg.orig/xen/arch/ia64/linux-xen/sal.c  2008-03-19 
11:52:42.000000000 +0900
+++ xen-unstable.hg/xen/arch/ia64/linux-xen/sal.c       2008-03-19 
11:53:03.000000000 +0900
@@ -121,8 +121,8 @@ static void __init
 sal_desc_entry_point (void *p)
 {
        struct ia64_sal_desc_entry_point *ep = p;
-       ia64_pal_handler_init(__va(ep->pal_proc));
-       ia64_sal_handler_init(__va(ep->sal_proc), __va(ep->gp));
+       ia64_pal_handler_init(__va_efi(ep->pal_proc));
+       ia64_sal_handler_init(__va_efi(ep->sal_proc), __va_efi(ep->gp));
 }
 
 #ifdef CONFIG_SMP
Index: xen-unstable.hg/xen/include/asm-ia64/xenpage.h
===================================================================
--- xen-unstable.hg.orig/xen/include/asm-ia64/xenpage.h 2008-03-19 
11:52:42.000000000 +0900
+++ xen-unstable.hg/xen/include/asm-ia64/xenpage.h      2008-03-19 
11:54:41.000000000 +0900
@@ -97,5 +97,14 @@ static inline u64 pa_clear_uc(u64 paddr)
 /* It is sometimes very useful to have unsigned long as result.  */
 #define __va_ul(x)     ({xen_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.l;})
 
+/* Do __va_efi() should just call __va() until the use of 
+ * __IA64_EFI_CACHED_OFFSET is activated in efi_enter_virtual_mode()
+ */
+#if 0
+#define __va_efi(x)    ((unsigned long)(x) | __IA64_EFI_CACHED_OFFSET)
+#else
+#define __va_efi(x)    __va(x)
+#endif
+
 #endif
 #endif /* _ASM_IA64_XENPAGE_H */

-- 

-- 
Horms


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