arch/arm/include/asm/efi.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
   4  */
   5
   6 #ifndef __ASM_ARM_EFI_H
   7 #define __ASM_ARM_EFI_H
   8
   9 #include <asm/cacheflush.h>
  10 #include <asm/cachetype.h>
  11 #include <asm/early_ioremap.h>
  12 #include <asm/fixmap.h>
  13 #include <asm/highmem.h>
  14 #include <asm/mach/map.h>
  15 #include <asm/mmu_context.h>
  16 #include <asm/ptrace.h>
  17 #include <asm/uaccess.h>
  18
  19 #ifdef CONFIG_EFI
  20 void efi_init(void);
  21 void arm_efi_init(void);
  22
  23 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
  24 int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md, bool);
  25
  26 #define arch_efi_call_virt_setup()      efi_virtmap_load()
  27 #define arch_efi_call_virt_teardown()   efi_virtmap_unload()
  28
  29 #ifdef CONFIG_CPU_TTBR0_PAN
  30 #undef arch_efi_call_virt
  31 #define arch_efi_call_virt(p, f, args...) ({                            \
  32         unsigned int flags = uaccess_save_and_enable();                 \
  33         efi_status_t res = _Generic((p)->f(args),                       \
  34                         efi_status_t:   (p)->f(args),                   \
  35                         default:        ((p)->f(args), EFI_ABORTED));   \
  36         uaccess_restore(flags);                                         \
  37         res;                                                            \
  38 })
  39 #endif
  40
  41 #define ARCH_EFI_IRQ_FLAGS_MASK \
  42         (PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \
  43          PSR_T_BIT | MODE_MASK)
  44
  45 static inline void efi_set_pgd(struct mm_struct *mm)
  46 {
  47         check_and_switch_context(mm, NULL);
  48 }
  49
  50 void efi_virtmap_load(void);
  51 void efi_virtmap_unload(void);
  52
  53 #else
  54 #define arm_efi_init()
  55 #endif /* CONFIG_EFI */
  56
  57 /* arch specific definitions used by the stub code */
  58
  59 /*
  60  * A reasonable upper bound for the uncompressed kernel size is 32 MBytes,
  61  * so we will reserve that amount of memory. We have no easy way to tell what
  62  * the actuall size of code + data the uncompressed kernel will use.
  63  * If this is insufficient, the decompressor will relocate itself out of the
  64  * way before performing the decompression.
  65  */
  66 #define MAX_UNCOMP_KERNEL_SIZE  SZ_32M
  67
  68 /*
  69  * phys-to-virt patching requires that the physical to virtual offset is a
  70  * multiple of 2 MiB. However, using an alignment smaller than TEXT_OFFSET
  71  * here throws off the memory allocation logic, so let's use the lowest power
  72  * of two greater than 2 MiB and greater than TEXT_OFFSET.
  73  */
  74 #define EFI_PHYS_ALIGN          max(UL(SZ_2M), roundup_pow_of_two(TEXT_OFFSET))
  75
  76 /* on ARM, the initrd should be loaded in a lowmem region */
  77 static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
  78 {
  79         return round_down(image_addr, SZ_4M) + SZ_512M;
  80 }
  81
  82 struct efi_arm_entry_state {
  83         u32     cpsr_before_ebs;
  84         u32     sctlr_before_ebs;
  85         u32     cpsr_after_ebs;
  86         u32     sctlr_after_ebs;
  87 };
  88
  89 static inline void efi_capsule_flush_cache_range(void *addr, int size)
  90 {
  91         __cpuc_flush_dcache_area(addr, size);
  92 }
  93
  94 #endif /* _ASM_ARM_EFI_H */