[U-Boot] [PATCH v4 07/21] sandbox: Map host memory for efi_loader

[Alexander Graf]

With efi_loader we do not control payload applications, so we can not
teach them about the difference between virtual and physical addresses.

Instead, let's just always map host virtual addresses in the efi memory
map. That way we can be sure that all memory allocation functions always
return consumable pointers.

Signed-off-by: Alexander Graf <agraf at suse.de>

---

v1 -> v2:

  - only compile efi_add_known_memory if efi_loader is enabled

v3 -> v4:

  - don't compile efi mapping code in for spl
---
 arch/sandbox/cpu/cpu.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/sandbox/cpu/cpu.c b/arch/sandbox/cpu/cpu.c
index cde0b055a6..29dac8dfda 100644
--- a/arch/sandbox/cpu/cpu.c
+++ b/arch/sandbox/cpu/cpu.c
@@ -5,6 +5,7 @@
 #define DEBUG
 #include <common.h>
 #include <dm.h>
+#include <efi_loader.h>
 #include <errno.h>
 #include <linux/libfdt.h>
 #include <os.h>
@@ -177,3 +178,22 @@ void longjmp(jmp_buf jmp, int ret)
 	while (1)
 		;
 }
+
+#if CONFIG_IS_ENABLED(EFI_LOADER)
+
+/*
+ * In sandbox, we don't have a 1:1 map, so we need to expose
+ * process addresses instead of U-Boot addresses
+ */
+void efi_add_known_memory(void)
+{
+	u64 ram_start = (uintptr_t)map_sysmem(0, gd->ram_size);
+	u64 ram_size = gd->ram_size;
+	u64 start = (ram_start + EFI_PAGE_MASK) & ~EFI_PAGE_MASK;
+	u64 pages = (ram_size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
+
+	efi_add_memory_map(start, pages, EFI_CONVENTIONAL_MEMORY,
+			   false);
+}
+
+#endif
-- 
2.12.3