From: David Woodhouse <David.Woodhouse@intel.com>
Date: Mon, 7 Jan 2013 22:09:49 +0000 (+0000)
Subject: x86, efi: Fix PCI ROM handing in EFI boot stub, in 32-bit mode
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b607e2126705ca28ecf21aa051172882bbdaae8a;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

x86, efi: Fix PCI ROM handing in EFI boot stub, in 32-bit mode

The 'Attributes' argument to pci->Attributes() function is 64-bit. So
when invoking in 32-bit mode it takes two registers, not just one.

This fixes memory corruption when booting via the 32-bit EFI boot stub.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: <stable@kernel.org>
Link: http://lkml.kernel.org/r/1358513837.2397.247.camel@shinybook.infradead.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Matt Fleming <matt.fleming@intel.com>
---

diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index 448a86e154a9..b7f220877294 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -295,10 +295,15 @@ static efi_status_t setup_efi_pci(struct boot_params *params)
 		if (!pci)
 			continue;
 
+#ifdef CONFIG_X86_64
 		status = efi_call_phys4(pci->attributes, pci,
 					EfiPciIoAttributeOperationGet, 0,
 					&attributes);
-
+#else
+		status = efi_call_phys5(pci->attributes, pci,
+					EfiPciIoAttributeOperationGet, 0, 0,
+					&attributes);
+#endif
 		if (status != EFI_SUCCESS)
 			continue;