ref(core): refactor ipi_cpumsg_handler_size calculation

The way this size was being calculated using the linker generated a
linking error when targetting risc-v.

Signed-off-by: Jose Martins <[email protected]>

Author: josecm

src/core/cpu.c

@@ -25,9 +25,9 @@ OBJPOOL_ALLOC(msg_pool, struct cpu_msg_node, CPU_MSG_POOL_SIZE);
 struct cpu_synctoken cpu_glb_sync = { .ready = false };
 
 extern cpu_msg_handler_t ipi_cpumsg_handlers[];
-extern uint8_t _ipi_cpumsg_handlers_size;
 extern size_t _ipi_cpumsg_handlers_id_start[];
-size_t ipi_cpumsg_handler_num;
+extern size_t _ipi_cpumsg_handlers_id_end[];
+static size_t ipi_cpumsg_handler_num;
 
 struct cpuif cpu_interfaces[PLAT_CPU_NUM];
 
@@ -44,7 +44,8 @@ void cpu_init(cpuid_t cpu_id, paddr_t load_addr)
     if (cpu_is_master()) {
         cpu_sync_init(&cpu_glb_sync, platform.cpu_num);
 
-        ipi_cpumsg_handler_num = ((size_t)&_ipi_cpumsg_handlers_size) / sizeof(cpu_msg_handler_t);
+        ipi_cpumsg_handler_num =
+            (size_t)(_ipi_cpumsg_handlers_id_end - _ipi_cpumsg_handlers_id_start);
         for (size_t i = 0; i < ipi_cpumsg_handler_num; i++) {
             ((size_t*)_ipi_cpumsg_handlers_id_start)[i] = i;
         }

src/linker.ld

@@ -46,10 +46,9 @@ SECTIONS
 	.ipi_cpumsg_handlers_id : {
 		_ipi_cpumsg_handlers_id_start = .;
 		*(.ipi_cpumsg_handlers_id)
+        _ipi_cpumsg_handlers_id_end = .;
 	}
 
-	_ipi_cpumsg_handlers_size = SIZEOF(.ipi_cpumsg_handlers);
-
     . = ALIGN(PAGE_SIZE);
     _image_load_end = .;