Add macro to calculate number of elements in an array

This patch defines the ARRAY_SIZE macro for calculating number of elements
in an array and uses it where appropriate.

Change-Id: I72746a9229f0b259323972b498b9a3999731bc9b

drivers/io/io_fip.c

@@ -143,7 +143,7 @@ static int file_to_uuid(const char *filename, uuid_t *uuid)
 	int i;
 	int status = -EINVAL;
 
-	for (i = 0; i < (sizeof(name_uuid) / sizeof(name_uuid[0])); i++) {
+	for (i = 0; i < ARRAY_SIZE(name_uuid); i++) {
 		if (strcmp(filename, name_uuid[i].name) == 0) {
 			copy_uuid(uuid, &name_uuid[i].uuid);
 			status = 0;

include/common/bl_common.h

@@ -108,6 +108,8 @@
 #include <stdint.h>
 #include <stddef.h>
 
+#define ARRAY_SIZE(a)	(sizeof(a) / sizeof((a)[0]))
+
 /*******************************************************************************
  * Structure used for telling the next BL how much of a particular type of
  * memory is available for its use and how much is already used.

lib/aarch64/xlat_tables.c

@@ -31,6 +31,7 @@
 #include <arch.h>
 #include <arch_helpers.h>
 #include <assert.h>
+#include <bl_common.h>
 #include <cassert.h>
 #include <platform_def.h>
 #include <string.h>
@@ -89,7 +90,7 @@ void mmap_add_region(unsigned long base_pa, unsigned long base_va,
 			unsigned long size, unsigned attr)
 {
 	mmap_region_t *mm = mmap;
-	mmap_region_t *mm_last = mm + sizeof(mmap) / sizeof(mmap[0]) - 1;
+	mmap_region_t *mm_last = mm + ARRAY_SIZE(mmap) - 1;
 	unsigned long pa_end = base_pa + size - 1;
 	unsigned long va_end = base_va + size - 1;
 

plat/fvp/aarch64/fvp_common.c

@@ -115,7 +115,7 @@ const mmap_region_t fvp_mmap[] = {
 };
 #endif
 
-CASSERT((sizeof(fvp_mmap)/sizeof(fvp_mmap[0])) + FVP_BL_REGIONS \
+CASSERT(ARRAY_SIZE(fvp_mmap) + FVP_BL_REGIONS \
 		<= MAX_MMAP_REGIONS, assert_max_mmap_regions);
 
 /* Array of secure interrupts to be configured by the gic driver */
@@ -132,9 +132,6 @@ const unsigned int irq_sec_array[] = {
 	IRQ_SEC_SGI_7
 };
 
-const unsigned int num_sec_irqs = sizeof(irq_sec_array) /
-	sizeof(irq_sec_array[0]);
-
 /*******************************************************************************
  * Macro generating the code for the function setting up the pagetables as per
  * the platform memory map & initialize the mmu, for the given exception level
@@ -326,7 +323,7 @@ void fvp_gic_init(void)
 		plat_config.gicd_base,
 		BASE_GICR_BASE,
 		irq_sec_array,
-		num_sec_irqs);
+		ARRAY_SIZE(irq_sec_array));
 }
 
 

plat/juno/aarch64/juno_common.c

@@ -114,7 +114,7 @@ static const mmap_region_t juno_mmap[] = {
 };
 #endif
 
-CASSERT((sizeof(juno_mmap)/sizeof(juno_mmap[0])) + JUNO_BL_REGIONS \
+CASSERT(ARRAY_SIZE(juno_mmap) + JUNO_BL_REGIONS \
 		<= MAX_MMAP_REGIONS, assert_max_mmap_regions);
 
 /* Array of secure interrupts to be configured by the gic driver */
@@ -136,9 +136,6 @@ const unsigned int irq_sec_array[] = {
 	IRQ_SEC_SGI_7
 };
 
-const unsigned int num_sec_irqs = sizeof(irq_sec_array) /
-	sizeof(irq_sec_array[0]);
-
 /*******************************************************************************
  * Macro generating the code for the function setting up the pagetables as per
  * the platform memory map & initialize the mmu, for the given exception level
@@ -211,5 +208,9 @@ uint64_t plat_get_syscnt_freq(void)
 
 void plat_gic_init(void)
 {
-	arm_gic_init(GICC_BASE, GICD_BASE, 0, irq_sec_array, num_sec_irqs);
+	arm_gic_init(GICC_BASE,
+		GICD_BASE,
+		0,
+		irq_sec_array,
+		ARRAY_SIZE(irq_sec_array));
 }