x86/efi: Support initrd loaded above 4G

For boot efi kernel directly without bootloader.
If the kernel support XLF_CAN_BE_LOADED_ABOVE_4G, we should
not limit initrd under hdr->initrd_add_max.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index 0331d76..385f42c 100644 (file)
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -1038,6 +1038,7 @@ struct boot_params *make_boot_params(struct efi_config *c)
        int i;
        unsigned long ramdisk_addr;
        unsigned long ramdisk_size;
+       unsigned long initrd_addr_max;
 
        efi_early = c;
        sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
@@ -1100,14 +1101,21 @@ struct boot_params *make_boot_params(struct efi_config *c)
 
        memset(sdt, 0, sizeof(*sdt));
 
+       if (hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G)
+               initrd_addr_max = -1UL;
+       else
+               initrd_addr_max = hdr->initrd_addr_max;
+
        status = handle_cmdline_files(sys_table, image,
                                      (char *)(unsigned long)hdr->cmd_line_ptr,
-                                     "initrd=", hdr->initrd_addr_max,
+                                     "initrd=", initrd_addr_max,
                                      &ramdisk_addr, &ramdisk_size);
        if (status != EFI_SUCCESS)
                goto fail2;
-       hdr->ramdisk_image = ramdisk_addr;
-       hdr->ramdisk_size = ramdisk_size;
+       hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
+       hdr->ramdisk_size  = ramdisk_size & 0xffffffff;
+       boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
+       boot_params->ext_ramdisk_size  = (u64)ramdisk_size >> 32;
 
        return boot_params;
 fail2: