disk: part_efi: clarify lbaint_t usage

- update the comments regarding lbaint_t usage
- cleanup casting of values related to the lbaint_t type
- cleanup of a type that requires a u64

Tested on little endian ARMv7 and ARMv8 configurations

Signed-off-by: Steve Rae <srae@broadcom.com>

2 files changed, 29 insertions, 27 deletions

diff --git a/disk/part_dos.c b/disk/part_dos.c
index 05c3933..b0c3af5 100644
--- a/disk/part_dos.c
+++ b/disk/part_dos.c
@@ -199,8 +199,9 @@ static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part
 		    (part_num == which_part) &&
 		    (is_extended(pt->sys_ind) == 0)) {
 			info->blksz = 512;
-			info->start = ext_part_sector + le32_to_int (pt->start4);
-			info->size  = le32_to_int (pt->size4);
+			info->start = (lbaint_t)(ext_part_sector +
+					le32_to_int(pt->start4));
+			info->size  = (lbaint_t)le32_to_int(pt->size4);
 			switch(dev_desc->if_type) {
 				case IF_TYPE_IDE:
 				case IF_TYPE_SATA:
diff --git a/disk/part_efi.c b/disk/part_efi.c
index 8c89740..78a3782 100644
--- a/disk/part_efi.c
+++ b/disk/part_efi.c
@@ -6,13 +6,9 @@
  */
 
 /*
- * Problems with CONFIG_SYS_64BIT_LBA:
- *
- * struct disk_partition.start in include/part.h is sized as ulong.
- * When CONFIG_SYS_64BIT_LBA is activated, lbaint_t changes from ulong to uint64_t.
- * For now, it is cast back to ulong at assignment.
- *
- * This limits the maximum size of addressable storage to < 2 Terra Bytes
+ * NOTE:
+ *   when CONFIG_SYS_64BIT_LBA is not defined, lbaint_t is 32 bits; this
+ *   limits the maximum size of addressable storage to < 2 Terra Bytes
  */
 #include <asm/unaligned.h>
 #include <common.h>
@@ -43,8 +39,8 @@ static inline u32 efi_crc32(const void *buf, u32 len)
 
 static int pmbr_part_valid(struct partition *part);
 static int is_pmbr_valid(legacy_mbr * mbr);
-static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba,
-				gpt_header * pgpt_head, gpt_entry ** pgpt_pte);
+static int is_gpt_valid(block_dev_desc_t *dev_desc, u64 lba,
+				gpt_header *pgpt_head, gpt_entry **pgpt_pte);
 static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc,
 				gpt_header * pgpt_head);
 static int is_pte_valid(gpt_entry * pte);
@@ -169,10 +165,10 @@ int get_partition_info_efi(block_dev_desc_t * dev_desc, int part,
 		return -1;
 	}
 
-	/* The ulong casting limits the maximum disk size to 2 TB */
-	info->start = (u64)le64_to_cpu(gpt_pte[part - 1].starting_lba);
+	/* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
+	info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba);
 	/* The ending LBA is inclusive, to calculate size, add 1 to it */
-	info->size = ((u64)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1)
+	info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1
 		     - info->start;
 	info->blksz = dev_desc->blksz;
 
@@ -279,12 +275,14 @@ int write_gpt_table(block_dev_desc_t *dev_desc,
 	gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
 
 	if (dev_desc->block_write(dev_desc->dev,
-				  le32_to_cpu(gpt_h->last_usable_lba) + 1,
+				  (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba)
+				  + 1,
 				  pte_blk_cnt, gpt_e) != pte_blk_cnt)
 		goto err;
 
 	if (dev_desc->block_write(dev_desc->dev,
-				  le32_to_cpu(gpt_h->my_lba), 1, gpt_h) != 1)
+				  (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1,
+				  gpt_h) != 1)
 		goto err;
 
 	debug("GPT successfully written to block device!\n");
@@ -298,9 +296,10 @@ int write_gpt_table(block_dev_desc_t *dev_desc,
 int gpt_fill_pte(gpt_header *gpt_h, gpt_entry *gpt_e,
 		disk_partition_t *partitions, int parts)
 {
-	u32 offset = (u32)le32_to_cpu(gpt_h->first_usable_lba);
-	ulong start;
-	u32 last_usable_lba = (u32)le32_to_cpu(gpt_h->last_usable_lba);
+	lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba);
+	lbaint_t start;
+	lbaint_t last_usable_lba = (lbaint_t)
+			le64_to_cpu(gpt_h->last_usable_lba);
 	int i, k;
 	size_t efiname_len, dosname_len;
 #ifdef CONFIG_PARTITION_UUIDS
@@ -364,7 +363,8 @@ int gpt_fill_pte(gpt_header *gpt_h, gpt_entry *gpt_e,
 			gpt_e[i].partition_name[k] =
 				(efi_char16_t)(partitions[i].name[k]);
 
-		debug("%s: name: %s offset[%d]: 0x%x size[%d]: 0x" LBAF "\n",
+		debug("%s: name: %s offset[%d]: 0x" LBAF
+		      " size[%d]: 0x" LBAF "\n",
 		      __func__, partitions[i].name, i,
 		      offset, i, partitions[i].size);
 	}
@@ -488,12 +488,12 @@ static int is_pmbr_valid(legacy_mbr * mbr)
  * Description: returns 1 if valid,  0 on error.
  * If valid, returns pointers to PTEs.
  */
-static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba,
-			gpt_header * pgpt_head, gpt_entry ** pgpt_pte)
+static int is_gpt_valid(block_dev_desc_t *dev_desc, u64 lba,
+			gpt_header *pgpt_head, gpt_entry **pgpt_pte)
 {
 	u32 crc32_backup = 0;
 	u32 calc_crc32;
-	unsigned long long lastlba;
+	u64 lastlba;
 
 	if (!dev_desc || !pgpt_head) {
 		printf("%s: Invalid Argument(s)\n", __func__);
@@ -501,7 +501,8 @@ static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba,
 	}
 
 	/* Read GPT Header from device */
-	if (dev_desc->block_read(dev_desc->dev, lba, 1, pgpt_head) != 1) {
+	if (dev_desc->block_read(dev_desc->dev, (lbaint_t)lba, 1, pgpt_head)
+			!= 1) {
 		printf("*** ERROR: Can't read GPT header ***\n");
 		return 0;
 	}
@@ -540,7 +541,7 @@ static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba,
 	}
 
 	/* Check the first_usable_lba and last_usable_lba are within the disk. */
-	lastlba = (unsigned long long)dev_desc->lba;
+	lastlba = (u64)dev_desc->lba;
 	if (le64_to_cpu(pgpt_head->first_usable_lba) > lastlba) {
 		printf("GPT: first_usable_lba incorrect: %llX > %llX\n",
 			le64_to_cpu(pgpt_head->first_usable_lba), lastlba);
@@ -548,7 +549,7 @@ static int is_gpt_valid(block_dev_desc_t * dev_desc, unsigned long long lba,
 	}
 	if (le64_to_cpu(pgpt_head->last_usable_lba) > lastlba) {
 		printf("GPT: last_usable_lba incorrect: %llX > %llX\n",
-			(u64) le64_to_cpu(pgpt_head->last_usable_lba), lastlba);
+			le64_to_cpu(pgpt_head->last_usable_lba), lastlba);
 		return 0;
 	}
 
@@ -625,7 +626,7 @@ static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc,
 	/* Read GPT Entries from device */
 	blk_cnt = BLOCK_CNT(count, dev_desc);
 	if (dev_desc->block_read (dev_desc->dev,
-		le64_to_cpu(pgpt_head->partition_entry_lba),
+		(lbaint_t)le64_to_cpu(pgpt_head->partition_entry_lba),
 		(lbaint_t) (blk_cnt), pte)
 		!= blk_cnt) {