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-rw-r--r--include/linux/moduleparam.h65
1 files changed, 64 insertions, 1 deletions
diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index 52666d90ca94..6be1949ebcdf 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -60,9 +60,11 @@ struct kernel_param_ops {
* Flags available for kernel_param
*
* UNSAFE - the parameter is dangerous and setting it will taint the kernel
+ * HWPARAM - Hardware param not permitted in lockdown mode
*/
enum {
- KERNEL_PARAM_FL_UNSAFE = (1 << 0)
+ KERNEL_PARAM_FL_UNSAFE = (1 << 0),
+ KERNEL_PARAM_FL_HWPARAM = (1 << 1),
};
struct kernel_param {
@@ -451,6 +453,67 @@ extern int param_set_bint(const char *val, const struct kernel_param *kp);
perm, -1, 0); \
__MODULE_PARM_TYPE(name, "array of " #type)
+enum hwparam_type {
+ hwparam_ioport, /* Module parameter configures an I/O port */
+ hwparam_iomem, /* Module parameter configures an I/O mem address */
+ hwparam_ioport_or_iomem, /* Module parameter could be either, depending on other option */
+ hwparam_irq, /* Module parameter configures an I/O port */
+ hwparam_dma, /* Module parameter configures a DMA channel */
+ hwparam_dma_addr, /* Module parameter configures a DMA buffer address */
+ hwparam_other, /* Module parameter configures some other value */
+};
+
+/**
+ * module_param_hw_named - A parameter representing a hw parameters
+ * @name: a valid C identifier which is the parameter name.
+ * @value: the actual lvalue to alter.
+ * @type: the type of the parameter
+ * @hwtype: what the value represents (enum hwparam_type)
+ * @perm: visibility in sysfs.
+ *
+ * Usually it's a good idea to have variable names and user-exposed names the
+ * same, but that's harder if the variable must be non-static or is inside a
+ * structure. This allows exposure under a different name.
+ */
+#define module_param_hw_named(name, value, type, hwtype, perm) \
+ param_check_##type(name, &(value)); \
+ __module_param_call(MODULE_PARAM_PREFIX, name, \
+ &param_ops_##type, &value, \
+ perm, -1, \
+ KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0)); \
+ __MODULE_PARM_TYPE(name, #type)
+
+#define module_param_hw(name, type, hwtype, perm) \
+ module_param_hw_named(name, name, type, hwtype, perm)
+
+/**
+ * module_param_hw_array - A parameter representing an array of hw parameters
+ * @name: the name of the array variable
+ * @type: the type, as per module_param()
+ * @hwtype: what the value represents (enum hwparam_type)
+ * @nump: optional pointer filled in with the number written
+ * @perm: visibility in sysfs
+ *
+ * Input and output are as comma-separated values. Commas inside values
+ * don't work properly (eg. an array of charp).
+ *
+ * ARRAY_SIZE(@name) is used to determine the number of elements in the
+ * array, so the definition must be visible.
+ */
+#define module_param_hw_array(name, type, hwtype, nump, perm) \
+ param_check_##type(name, &(name)[0]); \
+ static const struct kparam_array __param_arr_##name \
+ = { .max = ARRAY_SIZE(name), .num = nump, \
+ .ops = &param_ops_##type, \
+ .elemsize = sizeof(name[0]), .elem = name }; \
+ __module_param_call(MODULE_PARAM_PREFIX, name, \
+ &param_array_ops, \
+ .arr = &__param_arr_##name, \
+ perm, -1, \
+ KERNEL_PARAM_FL_HWPARAM | (hwparam_##hwtype & 0)); \
+ __MODULE_PARM_TYPE(name, "array of " #type)
+
+
extern const struct kernel_param_ops param_array_ops;
extern const struct kernel_param_ops param_ops_string;