[U-Boot] [PATCH v3 7/9] efi_loader: fix memory mapping for sandbox

[Heinrich Schuchardt]

The sandbox is using a virtual address space which is neither the physical
address space of the operating system nor the virtual address space in
which Linux aplications live. The addresses used insided the flattened
device tree use this sandbox virtual address space. The EFI subsystem uses
the virtual address space of the operating system and this is where the fdt
is stored.

Fix all incorrect addresses for the fdt in cmd/bootefi.cmd.

Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
v3
	rebase patch
	efi_install_fdt() is called with a sandbox address. This was not
	evident until fdtcontroladdr was fixed.
---
 cmd/bootefi.c | 29 +++++++++++++++++------------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index 2c9b2eb8b6f..bbba3382a32 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -153,15 +153,16 @@ static void set_load_options(struct efi_loaded_image *loaded_image_info,
 /**
  * copy_fdt() - Copy the device tree to a new location available to EFI
  *
- * The FDT is relocated into a suitable location within the EFI memory map.
+ * The FDT is copied to a suitable location within the EFI memory map.
  * Additional 12 KiB are added to the space in case the device tree needs to be
  * expanded later with fdt_open_into().
  *
- * @fdt_addr:	On entry, address of start of FDT. On exit, address of relocated
+ * @fdtp:	On entry a pointer to the flattened device tree.
+ *		On exit a pointer to the copy of the flattened device tree.
  *		FDT start
  * Return:	status code
  */
-static efi_status_t copy_fdt(ulong *fdt_addrp)
+static efi_status_t copy_fdt(void **fdtp)
 {
 	unsigned long fdt_ram_start = -1L, fdt_pages;
 	efi_status_t ret = 0;
@@ -185,12 +186,16 @@ static efi_status_t copy_fdt(ulong *fdt_addrp)
 	 * Give us at least 12 KiB of breathing room in case the device tree
 	 * needs to be expanded later.
 	 */
-	fdt = map_sysmem(*fdt_addrp, 0);
+	fdt = *fdtp;
 	fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
 	fdt_size = fdt_pages << EFI_PAGE_SHIFT;
 
-	/* Safe fdt location is at 127MB */
-	new_fdt_addr = fdt_ram_start + (127 * 1024 * 1024) + fdt_size;
+	/*
+	 * Safe fdt location is at 127 MiB.
+	 * On the sandbox convert from the sandbox address space.
+	 */
+	new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
+					     fdt_size, 0);
 	ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 				 EFI_RUNTIME_SERVICES_DATA, fdt_pages,
 				 &new_fdt_addr);
@@ -205,12 +210,11 @@ static efi_status_t copy_fdt(ulong *fdt_addrp)
 			goto done;
 		}
 	}
-
-	new_fdt = map_sysmem(new_fdt_addr, fdt_size);
+	new_fdt = (void *)(uintptr_t)new_fdt_addr;
 	memcpy(new_fdt, fdt, fdt_totalsize(fdt));
 	fdt_set_totalsize(new_fdt, fdt_size);
 
-	*fdt_addrp = new_fdt_addr;
+	*fdtp = (void *)(uintptr_t)new_fdt_addr;
 done:
 	return ret;
 }
@@ -278,6 +282,9 @@ static void efi_carve_out_dt_rsv(void *fdt)
 		if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
 			continue;
 
+		/* Convert from sandbox address space. */
+		addr = (uintptr_t)map_sysmem(addr, 0);
+
 		/*
 		 * Do not carve out the device tree. It is already marked as
 		 * EFI_RUNTIME_SERVICES_DATA
@@ -306,12 +313,10 @@ static efi_status_t efi_install_fdt(ulong fdt_addr)
 	}
 
 	/* Prepare fdt for payload */
-	ret = copy_fdt(&fdt_addr);
+	ret = copy_fdt(&fdt);
 	if (ret)
 		return ret;
 
-	unmap_sysmem(fdt);
-	fdt = map_sysmem(fdt_addr, 0);
 	if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 		printf("ERROR: failed to process device tree\n");
 		return EFI_LOAD_ERROR;
-- 
2.19.1