loader/linux: Support passing RSDP address via boot params

Xen PVH guests will have the RSDP at an arbitrary address. Support that
by passing the RSDP address via the boot parameters to Linux.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Tested-by: Hans van Kranenburg <hans@knorrie.org>

diff --git a/grub-core/loader/i386/linux.c b/grub-core/loader/i386/linux.c
index c408b10d8fba6793fb85ecb81d9e5b03a4b309f0..375ee80dc6b99336b407a50d7d2d6d597dbe9360 100644 (file)
--- a/grub-core/loader/i386/linux.c
+++ b/grub-core/loader/i386/linux.c
@@ -508,6 +508,10 @@ grub_linux_boot (void)
        }
     }
 
+#ifdef GRUB_KERNEL_USE_RSDP_ADDR
+  linux_params.acpi_rsdp_addr = grub_le_to_cpu64 (grub_rsdp_addr);
+#endif
+
   mmap_size = find_mmap_size ();
   /* Make sure that each size is aligned to a page boundary.  */
   cl_offset = ALIGN_UP (mmap_size + sizeof (linux_params), 4096);

diff --git a/include/grub/i386/linux.h b/include/grub/i386/linux.h
index 60c7c3b5e660276dc11d23f4a53ccc2f1e5536a5..a960593119e5bcd20dd419f977c45be1919f8cc1 100644 (file)
--- a/include/grub/i386/linux.h
+++ b/include/grub/i386/linux.h
@@ -210,8 +210,9 @@ struct linux_kernel_params
   grub_uint32_t ist_command;           /* 64 */
   grub_uint32_t ist_event;             /* 68 */
   grub_uint32_t ist_perf_level;                /* 6c */
+  grub_uint64_t acpi_rsdp_addr;                /* 70 */
 
-  grub_uint8_t padding5[0x80 - 0x70];
+  grub_uint8_t padding5[0x80 - 0x78];
 
   grub_uint8_t hd0_drive_info[0x10];   /* 80 */
   grub_uint8_t hd1_drive_info[0x10];   /* 90 */