This patch adds a command line option, phys_efi, which forces
EFI calls to stay in physical mode. This is mainly for the purpose
of being able to test the physical mode code path.
I believe that it may also be needed in order to kexec between
OS/hypervisors with different memory layouts, such as Linux->Xen and vice
versa, which have 0xe000... and 0xf000... as their page offset respecively.
However, I am still working on verifying this.
Signed-Off-By: Simon Horman <horms@xxxxxxxxxxxx>
Documentation/kernel-parameters.txt | 4 ++++
arch/ia64/kernel/efi.c | 9 ++++++++-
2 files changed, 12 insertions(+), 1 deletion(-)
Index: kexec-ia64-2.6/arch/ia64/kernel/efi.c
===================================================================
--- kexec-ia64-2.6.orig/arch/ia64/kernel/efi.c 2006-10-20 12:58:00.000000000 +0900
+++ kexec-ia64-2.6/arch/ia64/kernel/efi.c 2006-10-20 12:58:00.000000000 +0900
@@ -414,6 +414,7 @@
u64 efi_desc_size;
char *cp, vendor[100] = "unknown";
extern char saved_command_line[];
+ int phys_efi = 0;
int i;
/* it's too early to be able to use the standard kernel command line support... */
@@ -424,6 +425,9 @@
max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
} else if (memcmp(cp, "min_addr=", 9) == 0) {
min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
+ } else if (memcmp(cp, "phys_efi", 8) == 0) {
+ phys_efi = 1;
+ cp+=8;
} else {
while (*cp != ' ' && *cp)
++cp;
@@ -527,7 +531,10 @@
}
#endif
- efi_enter_virtual_mode();
+ if (phys_efi)
+ printk("Forcing EFI to stay in physical mode\n");
+ else
+ efi_enter_virtual_mode();
}
void
Index: kexec-ia64-2.6/Documentation/kernel-parameters.txt
===================================================================
--- kexec-ia64-2.6.orig/Documentation/kernel-parameters.txt 2006-10-20 12:57:20.000000000 +0900
+++ kexec-ia64-2.6/Documentation/kernel-parameters.txt 2006-10-20 12:58:00.000000000 +0900
@@ -1266,6 +1266,10 @@
pg. [PARIDE]
See Documentation/paride.txt.
+ phys_efi [IA-64] Force EFI, PAL and SAL calls to be made
+ in physical mode. Otherwise, if possible virtual mode
+ calls are made.
+
pirq= [SMP,APIC] Manual mp-table setup
See Documentation/i386/IO-APIC.txt.
--
--
Horms
H: http://www.vergenet.net/~horms/
W: http://www.valinux.co.jp/en/
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