File 0005-efi-Add-grub_efi_get_ram_base-function-for-arm64.patch of Package grub2

From 226e83d10e35d1a76e93114366740f994548fe04 Mon Sep 17 00:00:00 2001
From: Leif Lindholm <leif.lindholm@linaro.org>
Date: Mon, 9 Jul 2018 18:33:01 +0100
Subject: [PATCH 5/6] efi: Add grub_efi_get_ram_base() function for arm64

Since ARM platforms do not have a common memory map, add a helper
function that finds the lowest address region with the EFI_MEMORY_WB
attribute set in the UEFI memory map.

Required for the arm64 efi linux loader to restrict the initrd
location to where it will be accessible by the kernel at runtime.

Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/kern/efi/mm.c | 31 +++++++++++++++++++++++++++++++
 include/grub/efi/efi.h  |  3 +++
 2 files changed, 34 insertions(+)

diff --git a/grub-core/kern/efi/mm.c b/grub-core/kern/efi/mm.c
index 021d750b6..270d0b8cc 100644
--- a/grub-core/kern/efi/mm.c
+++ b/grub-core/kern/efi/mm.c
@@ -660,3 +660,34 @@ grub_efi_mm_init (void)
   grub_efi_free_pages ((grub_addr_t) memory_map,
 		       2 * BYTES_TO_PAGES (MEMORY_MAP_SIZE));
 }
+
+#if defined (__aarch64__)
+grub_err_t
+grub_efi_get_ram_base(grub_addr_t *base_addr)
+{
+  grub_efi_memory_descriptor_t *memory_map, *desc;
+  grub_efi_uintn_t memory_map_size, desc_size;
+  int ret;
+
+  memory_map_size = grub_efi_find_mmap_size();
+
+  memory_map = grub_malloc (memory_map_size);
+  if (! memory_map)
+    return GRUB_ERR_OUT_OF_MEMORY;
+  ret = grub_efi_get_memory_map (&memory_map_size, memory_map, NULL,
+				 &desc_size, NULL);
+
+  if (ret < 1)
+    return GRUB_ERR_BUG;
+
+  for (desc = memory_map, *base_addr = GRUB_UINT_MAX;
+       (grub_addr_t) desc < ((grub_addr_t) memory_map + memory_map_size);
+       desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
+    if (desc->attribute & GRUB_EFI_MEMORY_WB)
+      *base_addr = grub_min (*base_addr, desc->physical_start);
+
+  grub_free(memory_map);
+
+  return GRUB_ERR_NONE;
+}
+#endif
diff --git a/include/grub/efi/efi.h b/include/grub/efi/efi.h
index e8ae60931..13bc67d57 100644
--- a/include/grub/efi/efi.h
+++ b/include/grub/efi/efi.h
@@ -97,6 +97,9 @@ extern void (*EXPORT_VAR(grub_efi_net_config)) (grub_efi_handle_t hnd,
 #if defined(__arm__) || defined(__aarch64__)
 void *EXPORT_FUNC(grub_efi_get_firmware_fdt)(void);
 #endif
+#if defined(__aarch64__)
+grub_err_t EXPORT_FUNC(grub_efi_get_ram_base)(grub_addr_t *);
+#endif
 
 grub_addr_t grub_efi_modules_addr (void);
 
-- 
2.16.4
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