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/ - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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