static void __init pat_memconfig()

in kernel/inventory.c [303:367]

• 46 lines of code
• 12 McCabe index (conditional complexity)

static void __init pat_memconfig(void)
{
	unsigned long actual_len;
	struct pdc_pat_pd_addr_map_entry mem_table[PAT_MAX_RANGES+1];
	struct pdc_pat_pd_addr_map_entry *mtbl_ptr;
	physmem_range_t *pmem_ptr;
	long status;
	int entries;
	unsigned long length;
	int i;

	length = (PAT_MAX_RANGES + 1) * sizeof(struct pdc_pat_pd_addr_map_entry);

	status = pdc_pat_pd_get_addr_map(&actual_len, mem_table, length, 0L);

	if ((status != PDC_OK)
	    || ((actual_len % sizeof(struct pdc_pat_pd_addr_map_entry)) != 0)) {

		/* The above pdc call shouldn't fail, but, just in
		 * case, just use the PAGE0 info.
		 */

		printk("\n\n\n");
		printk(KERN_WARNING "WARNING! Could not get full memory configuration. "
			"All memory may not be used!\n\n\n");
		pagezero_memconfig();
		return;
	}

	entries = actual_len / sizeof(struct pdc_pat_pd_addr_map_entry);

	if (entries > PAT_MAX_RANGES) {
		printk(KERN_WARNING "This Machine has more memory ranges than we support!\n");
		printk(KERN_WARNING "Some memory may not be used!\n");
	}

	/* Copy information into the firmware independent pmem_ranges
	 * array, skipping types we don't care about. Notice we said
	 * "may" above. We'll use all the entries that were returned.
	 */

	npmem_ranges = 0;
	mtbl_ptr = mem_table;
	pmem_ptr = pmem_ranges; /* Global firmware independent table */
	for (i = 0; i < entries; i++,mtbl_ptr++) {
		if (   (mtbl_ptr->entry_type != PAT_MEMORY_DESCRIPTOR)
		    || (mtbl_ptr->memory_type != PAT_MEMTYPE_MEMORY)
		    || (mtbl_ptr->pages == 0)
		    || (   (mtbl_ptr->memory_usage != PAT_MEMUSE_GENERAL)
			&& (mtbl_ptr->memory_usage != PAT_MEMUSE_GI)
			&& (mtbl_ptr->memory_usage != PAT_MEMUSE_GNI) ) ) {

			continue;
		}

		if (npmem_ranges == MAX_PHYSMEM_RANGES) {
			printk(KERN_WARNING "This Machine has more memory ranges than we support!\n");
			printk(KERN_WARNING "Some memory will not be used!\n");
			break;
		}

		set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages);
		npmem_ranges++;
	}
}