File kexec-tools-ia64-PA.diff of Package kexec-tools

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File kexec-tools-ia64-PA.diff of Package kexec-tools

From 4bd67d530f92313fd66bb462d96e3995b8e08af3 Mon Sep 17 00:00:00 2001
From: Bjorn Helgaas <bjorn.helgaas@hp.com>
Date: Mon, 6 Oct 2008 09:24:03 -0600
Subject: [PATCH] ia64: make PA() work for both physical identity-mapped virtual addresses

The EFI Runtime Services Table contains pointers to ia64 function
descriptors.  On existing, pre-Tiano, firmware, SetVirtualAddressMap()
converts *all* these pointers from physical to virtual.  On Tiano-based
firmware, the pointer to the SetVirtualAddressMap() function descriptor
is not converted, so it remains a physical pointer.

The ia64 kexec purgatory patches the SetVirtualAddressMap() function
descriptor so that when the new kernel calls SetVirtualAddressMap(), it
never reaches firmware.  Instead, it calls a dummy function that just
returns success.

Purgatory runs in physical mode, so it must convert the pointer from the
RuntimeServicesTable to a physical address.  This patch makes that
conversion work both for old firmware (where the pointer is an identity-
mapped virtual address) and new Tiano firmware (where the pointer is a
physical address).

Without this patch, kexec on Tiano firmware causes an MCA because
ia64_env_setup() subtracts PAGE_OFFSET from a physical address and ends
up with an invalid physical address.  Referencing that address causes
the MCA.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Acked-by: Bernhard Walle <bwalle@suse.de>

---
 purgatory/arch/ia64/purgatory-ia64.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/purgatory/arch/ia64/purgatory-ia64.c
+++ b/purgatory/arch/ia64/purgatory-ia64.c
@@ -147,7 +147,7 @@ setup_arch(void)
 
 inline unsigned long PA(unsigned long addr)
 {
-	return addr - PAGE_OFFSET;
+	return addr & 0x0fffffffffffffffLL;
 }
 
 void

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