[RFC PATCH v2 44/48] x86: e820: use the lmb API for adding RAM memory

[Sughosh Ganu]

The EFI_CONVENTIONAL_MEMORY type is now being managed through the LMB
module. Add a separate function, lmb_add_memory() to add the RAM
memory to the LMB memory map. The efi_add_known_memory() function is
now used for adding any other memory type to the EFI memory map.

Signed-off-by: Sughosh Ganu <sughosh.ganu at linaro.org>
---
Changes since V1: New patch

 arch/x86/lib/e820.c | 47 ++++++++++++++++++++++++++++++++++-----------
 1 file changed, 36 insertions(+), 11 deletions(-)

diff --git a/arch/x86/lib/e820.c b/arch/x86/lib/e820.c
index 122b4f7ca0..8b3ce8c6ec 100644
--- a/arch/x86/lib/e820.c
+++ b/arch/x86/lib/e820.c
@@ -4,6 +4,7 @@
  */
 
 #include <efi_loader.h>
+#include <lmb.h>
 #include <asm/e820.h>
 #include <asm/global_data.h>
 
@@ -41,15 +42,11 @@ void efi_add_known_memory(void)
 {
 	struct e820_entry e820[E820MAX];
 	unsigned int i, num;
-	u64 start, ram_top;
+	u64 start;
 	int type;
 
 	num = install_e820_map(ARRAY_SIZE(e820), e820);
 
-	ram_top = (u64)gd->ram_top & ~EFI_PAGE_MASK;
-	if (!ram_top)
-		ram_top = 0x100000000ULL;
-
 	for (i = 0; i < num; ++i) {
 		start = e820[i].addr;
 
@@ -72,13 +69,41 @@ void efi_add_known_memory(void)
 			break;
 		}
 
-		if (type == EFI_CONVENTIONAL_MEMORY) {
-			efi_add_conventional_memory_map(start,
-							start + e820[i].size,
-							ram_top);
-		} else {
+		if (type != EFI_CONVENTIONAL_MEMORY)
 			efi_add_memory_map(start, e820[i].size, type);
-		}
 	}
 }
 #endif /* CONFIG_IS_ENABLED(EFI_LOADER) */
+
+#if CONFIG_IS_ENABLED(LMB)
+void lmb_add_memory(void)
+{
+	struct e820_entry e820[E820MAX];
+	unsigned int i, num;
+	u64 ram_top;
+
+	num = install_e820_map(ARRAY_SIZE(e820), e820);
+
+	ram_top = (u64)gd->ram_top & ~EFI_PAGE_MASK;
+	if (!ram_top)
+		ram_top = 0x100000000ULL;
+
+	for (i = 0; i < num; ++i) {
+		if (e820[i].type == E820_RAM) {
+			u64 start, size, rgn_top;
+
+			start = e820[i].addr;
+			size = e820[i].size;
+			rgn_top = start + size;
+
+			if (start > ram_top)
+				continue;
+
+			if (rgn_top > ram_top)
+				size -= rgn_top - ram_top;
+
+			lmb_add(start, size);
+		}
+	}
+}
+#endif /* CONFIG_IS_ENABLED(LMB) */
-- 
2.34.1