arch/sparc/kernel/prom_common.c

Source file repositories/reference/linux-study-clean/arch/sparc/kernel/prom_common.c

File Facts

System
Linux kernel
Corpus path
arch/sparc/kernel/prom_common.c
Extension
.c
Size
3500 bytes
Lines
162
Domain
Architecture Layer
Bucket
arch/sparc
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration 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 (!strcasecmp(prop->name, name)) {
			void *old_val = prop->value;
			int ret;

			ret = prom_setprop(dp->phandle, name, val, len);

			err = -EINVAL;
			if (ret >= 0) {
				prop->value = new_val;
				prop->length = len;

				if (OF_IS_DYNAMIC(prop))
					kfree(old_val);

				OF_MARK_DYNAMIC(prop);

				err = 0;
			}
			break;
		}
		prevp = &(*prevp)->next;
	}
	raw_spin_unlock_irqrestore(&devtree_lock, flags);
	mutex_unlock(&of_set_property_mutex);

	/* XXX Upate procfs if necessary... */

	return err;
}
EXPORT_SYMBOL(of_set_property);

int of_find_in_proplist(const char *list, const char *match, int len)
{
	while (len > 0) {
		int l;

		if (!strcmp(list, match))
			return 1;
		l = strlen(list) + 1;
		list += l;
		len -= l;
	}
	return 0;
}
EXPORT_SYMBOL(of_find_in_proplist);

/*
 * SPARC32 and SPARC64's prom_nextprop() do things differently
 * here, despite sharing the same interface.  SPARC32 doesn't fill in 'buf',
 * returning NULL on an error.  SPARC64 fills in 'buf', but sets it to an
 * empty string upon error.
 */
static int __init handle_nextprop_quirks(char *buf, const char *name)
{
	size_t name_len;

	name_len = name ? strlen(name) : 0;
	if (name_len == 0)
		return -1;

#ifdef CONFIG_SPARC32
	strscpy(buf, name, name_len + 1);
#endif
	return 0;
}

static int __init prom_common_nextprop(phandle node, char *prev, char *buf)
{
	const char *name;

	buf[0] = '\0';
	name = prom_nextprop(node, prev, buf);
	return handle_nextprop_quirks(buf, name);
}

unsigned int prom_early_allocated __initdata;

static struct of_pdt_ops prom_sparc_ops __initdata = {
	.nextprop = prom_common_nextprop,
	.getproplen = prom_getproplen,
	.getproperty = prom_getproperty,
	.getchild = prom_getchild,
	.getsibling = prom_getsibling,
};

void __init prom_build_devicetree(void)
{
	of_pdt_build_devicetree(prom_root_node, &prom_sparc_ops);
	of_console_init();

Annotation

Implementation Notes