arch/powerpc/platforms/pseries/plpks_sed_ops.c

Source file repositories/reference/linux-study-clean/arch/powerpc/platforms/pseries/plpks_sed_ops.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/platforms/pseries/plpks_sed_ops.c
Extension
.c
Size
3113 bytes
Lines
132
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

struct plpks_sed_object_data {
	u_char version;
	u_char pad1[7];
	u_long authority;
	u_long range;
	u_int  key_len;
	u_char key[32];
};

#define PLPKS_SED_OBJECT_DATA_V0        0
#define PLPKS_SED_MANGLED_LABEL         "/default/pri"
#define PLPKS_SED_COMPONENT             "sed-opal"
#define PLPKS_SED_KEY                   "opal-boot-pin"

/*
 * authority is admin1 and range is global
 */
#define PLPKS_SED_AUTHORITY  0x0000000900010001
#define PLPKS_SED_RANGE      0x0000080200000001

static void plpks_init_var(struct plpks_var *var, char *keyname)
{
	if (!plpks_sed_initialized) {
		plpks_sed_initialized = true;
		plpks_sed_available = plpks_is_available();
		if (!plpks_sed_available)
			pr_err("SED: plpks not available\n");
	}

	var->name = keyname;
	var->namelen = strlen(keyname);
	if (strcmp(PLPKS_SED_KEY, keyname) == 0) {
		var->name = PLPKS_SED_MANGLED_LABEL;
		var->namelen = strlen(keyname);
	}
	var->policy = PLPKS_WORLDREADABLE;
	var->os = PLPKS_VAR_COMMON;
	var->data = NULL;
	var->datalen = 0;
	var->component = PLPKS_SED_COMPONENT;
}

/*
 * Read the SED Opal key from PLPKS given the label
 */
int sed_read_key(char *keyname, char *key, u_int *keylen)
{
	struct plpks_var var;
	struct plpks_sed_object_data data;
	int ret;
	u_int len;

	plpks_init_var(&var, keyname);

	if (!plpks_sed_available)
		return -EOPNOTSUPP;

	var.data = (u8 *)&data;
	var.datalen = sizeof(data);

	ret = plpks_read_os_var(&var);
	if (ret != 0)
		return ret;

	len = min_t(u16, be32_to_cpu(data.key_len), var.datalen);
	memcpy(key, data.key, len);
	key[len] = '\0';
	*keylen = len;

	return 0;
}

/*
 * Write the SED Opal key to PLPKS given the label
 */
int sed_write_key(char *keyname, char *key, u_int keylen)
{
	struct plpks_var var;
	struct plpks_sed_object_data data;
	struct plpks_var_name vname;

	plpks_init_var(&var, keyname);

	if (!plpks_sed_available)
		return -EOPNOTSUPP;

	var.datalen = sizeof(struct plpks_sed_object_data);
	var.data = (u8 *)&data;

	/* initialize SED object */

Annotation

Implementation Notes