Merge tag 'uuid-for-4.14' of git://git.infradead.org/users/hch/uuid

[platform/kernel/linux-exynos.git] / include / linux / efi.h

diff --git a/include/linux/efi.h b/include/linux/efi.h
index 7a322ae..66f4a4e 100644 (file)
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -985,7 +985,7 @@ static inline void efi_esrt_init(void) { }
 extern int efi_config_parse_tables(void *config_tables, int count, int sz,
                                   efi_config_table_type_t *arch_tables);
 extern u64 efi_get_iobase (void);
-extern u32 efi_mem_type (unsigned long phys_addr);
+extern int efi_mem_type(unsigned long phys_addr);
 extern u64 efi_mem_attributes (unsigned long phys_addr);
 extern u64 efi_mem_attribute (unsigned long phys_addr, unsigned long size);
 extern int __init efi_uart_console_only (void);
@@ -1020,6 +1020,28 @@ extern int efi_memattr_init(void);
 extern int efi_memattr_apply_permissions(struct mm_struct *mm,
                                         efi_memattr_perm_setter fn);
 
+/*
+ * efi_early_memdesc_ptr - get the n-th EFI memmap descriptor
+ * @map: the start of efi memmap
+ * @desc_size: the size of space for each EFI memmap descriptor
+ * @n: the index of efi memmap descriptor
+ *
+ * EFI boot service provides the GetMemoryMap() function to get a copy of the
+ * current memory map which is an array of memory descriptors, each of
+ * which describes a contiguous block of memory. It also gets the size of the
+ * map, and the size of each descriptor, etc.
+ *
+ * Note that per section 6.2 of UEFI Spec 2.6 Errata A, the returned size of
+ * each descriptor might not be equal to sizeof(efi_memory_memdesc_t),
+ * since efi_memory_memdesc_t may be extended in the future. Thus the OS
+ * MUST use the returned size of the descriptor to find the start of each
+ * efi_memory_memdesc_t in the memory map array. This should only be used
+ * during bootup since for_each_efi_memory_desc_xxx() is available after the
+ * kernel initializes the EFI subsystem to set up struct efi_memory_map.
+ */
+#define efi_early_memdesc_ptr(map, desc_size, n)                       \
+       (efi_memory_desc_t *)((void *)(map) + ((n) * (desc_size)))
+
 /* Iterate through an efi_memory_map */
 #define for_each_efi_memory_desc_in_map(m, md)                            \
        for ((md) = (m)->map;                                              \
@@ -1091,6 +1113,8 @@ static inline bool efi_enabled(int feature)
        return test_bit(feature, &efi.flags) != 0;
 }
 extern void efi_reboot(enum reboot_mode reboot_mode, const char *__unused);
+
+extern bool efi_is_table_address(unsigned long phys_addr);
 #else
 static inline bool efi_enabled(int feature)
 {
@@ -1104,6 +1128,11 @@ efi_capsule_pending(int *reset_type)
 {
        return false;
 }
+
+static inline bool efi_is_table_address(unsigned long phys_addr)
+{
+       return false;
+}
 #endif
 
 extern int efi_status_to_err(efi_status_t status);
@@ -1497,6 +1526,13 @@ enum efi_secureboot_mode {
 };
 enum efi_secureboot_mode efi_get_secureboot(efi_system_table_t *sys_table);
 
+#ifdef CONFIG_RESET_ATTACK_MITIGATION
+void efi_enable_reset_attack_mitigation(efi_system_table_t *sys_table_arg);
+#else
+static inline void
+efi_enable_reset_attack_mitigation(efi_system_table_t *sys_table_arg) { }
+#endif
+
 /*
  * Arch code can implement the following three template macros, avoiding
  * reptition for the void/non-void return cases of {__,}efi_call_virt():
@@ -1557,6 +1593,8 @@ efi_status_t efi_exit_boot_services(efi_system_table_t *sys_table,
                                    void *priv,
                                    efi_exit_boot_map_processing priv_func);
 
+#define EFI_RANDOM_SEED_SIZE           64U
+
 struct linux_efi_random_seed {
        u32     size;
        u8      bits[];