linux-kernel - [PATCH 2/2] efilinux: set ext_ramdisk

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Date:	Tue, 17 Jun 2014 23:41:09 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Matt Fleming <matt.fleming@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 2/2] efilinux: set ext_ramdisk_* for huge initrd

We could load it high if it is more than 2G when kernel support
LOAD_ABOVE_4G.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 loaders/bzimage/bzimage.c |    9 ++++++++-
 loaders/bzimage/bzimage.h |    8 ++++++--
 2 files changed, 14 insertions(+), 3 deletions(-)

Index: efilinux/loaders/bzimage/bzimage.c
===================================================================
--- efilinux.orig/loaders/bzimage/bzimage.c
+++ efilinux/loaders/bzimage/bzimage.c
@@ -130,7 +130,9 @@ static void parse_initrd(EFI_LOADED_IMAG
 	if (err != EFI_SUCCESS)
 		goto close_handles;
 
-	if ((UINTN)addr > boot_params->hdr.ramdisk_max) {
+	if ((boot_params->hdr.version < 0x20c ||
+	     !(boot_params->hdr.xloadflags & (1<<1))) &&
+	    (UINTN)addr > boot_params->hdr.ramdisk_max) {
 		Print(L"ramdisk address is too high!\n");
 		efree(addr, size);
 		goto close_handles;
@@ -138,6 +140,11 @@ static void parse_initrd(EFI_LOADED_IMAG
 
 	boot_params->hdr.ramdisk_start = (UINT32)(UINTN)addr;
 	boot_params->hdr.ramdisk_len = (UINT32)size;
+	if (boot_params->hdr.version >= 0x20c &&
+	    (boot_params->hdr.xloadflags & (1<<1))) {
+		boot_params->ext_ramdisk_image = (UINT64)(UINTN)addr >> 32;
+		boot_params->ext_ramdisk_size = size >> 32;
+	}
 
 	for (j = 0; j < nr_initrds; j++) {
 		struct initrd *rd = &initrds[j];
Index: efilinux/loaders/bzimage/bzimage.h
===================================================================
--- efilinux.orig/loaders/bzimage/bzimage.h
+++ efilinux/loaders/bzimage/bzimage.h
@@ -69,7 +69,8 @@ struct setup_header {
 	UINT32 ramdisk_max;    /* Highest legal initrd address */
 	UINT32 kernel_alignment; /* Physical addr alignment required for kernel */
 	UINT8 relocatable_kernel; /* Whether kernel is relocatable or not */
-	UINT8 _pad2[3];
+	UINT8 min_alignment;
+	UINT16 xloadflags;
 	UINT32 cmdline_size;
 	UINT32 hardware_subarch;
 	UINT64 hardware_subarch_data;
@@ -148,7 +149,10 @@ struct boot_params {
 	UINT8 hd1_info[16];
 	UINT8 sys_desc_table[0x10];
 	UINT8 olpc_ofw_header[0x10];
-	UINT8 _pad4[128];
+	UINT32 ext_ramdisk_image;
+	UINT32 ext_ramdisk_size;
+	UINT32 ext_cmd_line_ptr;
+	UINT8 _pad4[116];
 	UINT8 edid_info[0x80];
 	struct efi_info efi_info;
 	UINT32 alt_mem_k;
--
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