[U-Boot] [PATCH v4 8/9] efi_loader: Declare secure memory as reserved

[Alexander Graf]

Some systems may implemente TrustZone (EL3) in U-Boot. Those systems
reserve some memory that U-Boot is aware of as secure.

For those systems, mask out that secure memory in the EFI memory map,
as it's not usable from EL2 or EL1.

Signed-off-by: Alexander Graf <agraf at suse.de>
---
 lib/efi_loader/efi_memory.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c
index df2381e..6e2eeeb 100644
--- a/lib/efi_loader/efi_memory.c
+++ b/lib/efi_loader/efi_memory.c
@@ -398,5 +398,20 @@ int efi_memory_init(void)
 	efi_bounce_buffer = (void*)(uintptr_t)efi_bounce_buffer_addr;
 #endif
 
+#ifdef CONFIG_SYS_MEM_RESERVE_SECURE
+	/* Declare secure ram as reserved */
+        if (gd->secure_ram & MEM_RESERVE_SECURE_SECURED) {
+		uint64_t secure_start = gd->secure_ram;
+		uint64_t secure_pages = CONFIG_SYS_MEM_RESERVE_SECURE;
+
+		secure_start &= MEM_RESERVE_SECURE_ADDR_MASK;
+		secure_start &= ~EFI_PAGE_MASK;
+		secure_pages = (secure_pages + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
+
+		efi_add_memory_map(secure_start, secure_pages,
+				   EFI_RESERVED_MEMORY_TYPE, false);
+        }
+#endif
+
 	return 0;
 }
-- 
1.8.5.6