cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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efi.h (4205B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _ASM_EFI_H
      3#define _ASM_EFI_H
      4
      5#include <asm/boot.h>
      6#include <asm/cpufeature.h>
      7#include <asm/fpsimd.h>
      8#include <asm/io.h>
      9#include <asm/memory.h>
     10#include <asm/mmu_context.h>
     11#include <asm/neon.h>
     12#include <asm/ptrace.h>
     13#include <asm/tlbflush.h>
     14
     15#ifdef CONFIG_EFI
     16extern void efi_init(void);
     17#else
     18#define efi_init()
     19#endif
     20
     21int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
     22int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
     23
     24#define arch_efi_call_virt_setup()					\
     25({									\
     26	efi_virtmap_load();						\
     27	__efi_fpsimd_begin();						\
     28})
     29
     30#define arch_efi_call_virt(p, f, args...)				\
     31({									\
     32	efi_##f##_t *__f;						\
     33	__f = p->f;							\
     34	__efi_rt_asm_wrapper(__f, #f, args);				\
     35})
     36
     37#define arch_efi_call_virt_teardown()					\
     38({									\
     39	__efi_fpsimd_end();						\
     40	efi_virtmap_unload();						\
     41})
     42
     43efi_status_t __efi_rt_asm_wrapper(void *, const char *, ...);
     44
     45#define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
     46
     47/*
     48 * Even when Linux uses IRQ priorities for IRQ disabling, EFI does not.
     49 * And EFI shouldn't really play around with priority masking as it is not aware
     50 * which priorities the OS has assigned to its interrupts.
     51 */
     52#define arch_efi_save_flags(state_flags)		\
     53	((void)((state_flags) = read_sysreg(daif)))
     54
     55#define arch_efi_restore_flags(state_flags)	write_sysreg(state_flags, daif)
     56
     57
     58/* arch specific definitions used by the stub code */
     59
     60/*
     61 * In some configurations (e.g. VMAP_STACK && 64K pages), stacks built into the
     62 * kernel need greater alignment than we require the segments to be padded to.
     63 */
     64#define EFI_KIMG_ALIGN	\
     65	(SEGMENT_ALIGN > THREAD_ALIGN ? SEGMENT_ALIGN : THREAD_ALIGN)
     66
     67/*
     68 * On arm64, we have to ensure that the initrd ends up in the linear region,
     69 * which is a 1 GB aligned region of size '1UL << (VA_BITS_MIN - 1)' that is
     70 * guaranteed to cover the kernel Image.
     71 *
     72 * Since the EFI stub is part of the kernel Image, we can relax the
     73 * usual requirements in Documentation/arm64/booting.rst, which still
     74 * apply to other bootloaders, and are required for some kernel
     75 * configurations.
     76 */
     77static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
     78{
     79	return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS_MIN - 1));
     80}
     81
     82#define alloc_screen_info(x...)		&screen_info
     83
     84static inline void free_screen_info(struct screen_info *si)
     85{
     86}
     87
     88#define EFI_ALLOC_ALIGN		SZ_64K
     89
     90/*
     91 * On ARM systems, virtually remapped UEFI runtime services are set up in two
     92 * distinct stages:
     93 * - The stub retrieves the final version of the memory map from UEFI, populates
     94 *   the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
     95 *   service to communicate the new mapping to the firmware (Note that the new
     96 *   mapping is not live at this time)
     97 * - During an early initcall(), the EFI system table is permanently remapped
     98 *   and the virtual remapping of the UEFI Runtime Services regions is loaded
     99 *   into a private set of page tables. If this all succeeds, the Runtime
    100 *   Services are enabled and the EFI_RUNTIME_SERVICES bit set.
    101 */
    102
    103static inline void efi_set_pgd(struct mm_struct *mm)
    104{
    105	__switch_mm(mm);
    106
    107	if (system_uses_ttbr0_pan()) {
    108		if (mm != current->active_mm) {
    109			/*
    110			 * Update the current thread's saved ttbr0 since it is
    111			 * restored as part of a return from exception. Enable
    112			 * access to the valid TTBR0_EL1 and invoke the errata
    113			 * workaround directly since there is no return from
    114			 * exception when invoking the EFI run-time services.
    115			 */
    116			update_saved_ttbr0(current, mm);
    117			uaccess_ttbr0_enable();
    118			post_ttbr_update_workaround();
    119		} else {
    120			/*
    121			 * Defer the switch to the current thread's TTBR0_EL1
    122			 * until uaccess_enable(). Restore the current
    123			 * thread's saved ttbr0 corresponding to its active_mm
    124			 */
    125			uaccess_ttbr0_disable();
    126			update_saved_ttbr0(current, current->active_mm);
    127		}
    128	}
    129}
    130
    131void efi_virtmap_load(void);
    132void efi_virtmap_unload(void);
    133
    134static inline void efi_capsule_flush_cache_range(void *addr, int size)
    135{
    136	dcache_clean_inval_poc((unsigned long)addr, (unsigned long)addr + size);
    137}
    138
    139#endif /* _ASM_EFI_H */