arch/powerpc/kexec/ranges.c

Source file repositories/reference/linux-study-clean/arch/powerpc/kexec/ranges.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/kexec/ranges.c
Extension
.c
Size
18890 bytes
Lines
730
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

if (base < mend && end > mstart) {
			if (base < mstart)
				mem_rngs->ranges[i].start = base;
			if (end > mend)
				mem_rngs->ranges[i].end = end;
			return 0;
		}
	}

	return __add_mem_range(mem_ranges, base, size);
}

#endif /* CONFIG_KEXEC_FILE || CONFIG_CRASH_DUMP */

#ifdef CONFIG_KEXEC_FILE
/**
 * add_tce_mem_ranges - Adds tce-table range to the given memory ranges list.
 * @mem_ranges:         Range list to add the memory range(s) to.
 *
 * Returns 0 on success, negative errno on error.
 */
static int add_tce_mem_ranges(struct crash_mem **mem_ranges)
{
	struct device_node *dn = NULL;
	int ret = 0;

	for_each_node_by_type(dn, "pci") {
		u64 base;
		u32 size;

		ret = of_property_read_u64(dn, "linux,tce-base", &base);
		ret |= of_property_read_u32(dn, "linux,tce-size", &size);
		if (ret) {
			/*
			 * It is ok to have pci nodes without tce. So, ignore
			 * property does not exist error.
			 */
			if (ret == -EINVAL) {
				ret = 0;
				continue;
			}
			break;
		}

		ret = add_mem_range(mem_ranges, base, size);
		if (ret)
			break;
	}

	of_node_put(dn);
	return ret;
}

/**
 * add_initrd_mem_range - Adds initrd range to the given memory ranges list,
 *                        if the initrd was retained.
 * @mem_ranges:           Range list to add the memory range to.
 *
 * Returns 0 on success, negative errno on error.
 */
static int add_initrd_mem_range(struct crash_mem **mem_ranges)
{
	u64 base, end;
	int ret;

	/* This range means something, only if initrd was retained */
	if (!strstr(saved_command_line, "retain_initrd"))
		return 0;

	ret = of_property_read_u64(of_chosen, "linux,initrd-start", &base);
	ret |= of_property_read_u64(of_chosen, "linux,initrd-end", &end);
	if (!ret)
		ret = add_mem_range(mem_ranges, base, end - base + 1);

	return ret;
}

/**
 * add_htab_mem_range - Adds htab range to the given memory ranges list,
 *                      if it exists
 * @mem_ranges:         Range list to add the memory range to.
 *
 * Returns 0 on success, negative errno on error.
 */
static int add_htab_mem_range(struct crash_mem **mem_ranges)
{

#ifdef CONFIG_PPC_64S_HASH_MMU
	if (!htab_address)
		return 0;

Annotation

Implementation Notes