Merge tag 'efi-2022-01-rc1' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request for efi-2022-01-rc1

Documentation:
	Use Sphinx 3.43.
	Move system reset documentation to HTML

UEFI:
	Fix linking EFI apps with LLVM
	Fix alignment of loaded image
	Correct simple network protocol test
	Code cleanup

1 files changed, 52 insertions, 0 deletions

diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c
index f4acbee4f9b..7f0b5072819 100644
--- a/lib/efi_loader/efi_memory.c
+++ b/lib/efi_loader/efi_memory.c
@@ -550,6 +550,58 @@ efi_status_t efi_free_pages(uint64_t memory, efi_uintn_t pages)
 }
 
 /**
+ * efi_alloc_aligned_pages - allocate
+ *
+ * @len:		len in bytes
+ * @memory_type:	usage type of the allocated memory
+ * @align:		alignment in bytes
+ * Return:		aligned memory or NULL
+ */
+void *efi_alloc_aligned_pages(u64 len, int memory_type, size_t align)
+{
+	u64 req_pages = efi_size_in_pages(len);
+	u64 true_pages = req_pages + efi_size_in_pages(align) - 1;
+	u64 free_pages;
+	u64 aligned_mem;
+	efi_status_t r;
+	u64 mem;
+
+	/* align must be zero or a power of two */
+	if (align & (align - 1))
+		return NULL;
+
+	/* Check for overflow */
+	if (true_pages < req_pages)
+		return NULL;
+
+	if (align < EFI_PAGE_SIZE) {
+		r = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES, memory_type,
+				       req_pages, &mem);
+		return (r == EFI_SUCCESS) ? (void *)(uintptr_t)mem : NULL;
+	}
+
+	r = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES, memory_type,
+			       true_pages, &mem);
+	if (r != EFI_SUCCESS)
+		return NULL;
+
+	aligned_mem = ALIGN(mem, align);
+	/* Free pages before alignment */
+	free_pages = efi_size_in_pages(aligned_mem - mem);
+	if (free_pages)
+		efi_free_pages(mem, free_pages);
+
+	/* Free trailing pages */
+	free_pages = true_pages - (req_pages + free_pages);
+	if (free_pages) {
+		mem = aligned_mem + req_pages * EFI_PAGE_SIZE;
+		efi_free_pages(mem, free_pages);
+	}
+
+	return (void *)(uintptr_t)aligned_mem;
+}
+
+/**
  * efi_allocate_pool - allocate memory from pool
  *
  * @pool_type:	type of the pool from which memory is to be allocated