linux_dsm_epyc7002/arch/arm64/include/asm/efi.h
Ard Biesheuvel 966291f634 efi/libstub: Rename efi_call_early/_runtime macros to be more intuitive
The macros efi_call_early and efi_call_runtime are used to call EFI
boot services and runtime services, respectively. However, the naming
is confusing, given that the early vs runtime distinction may suggest
that these are used for calling the same set of services either early
or late (== at runtime), while in reality, the sets of services they
can be used with are completely disjoint, and efi_call_runtime is also
only usable in 'early' code.

So do a global sweep to replace all occurrences with efi_bs_call or
efi_rt_call, respectively, where BS and RT match the idiom used by
the UEFI spec to refer to boot time or runtime services.

While at it, use 'func' as the macro parameter name for the function
pointers, which is less likely to collide and cause weird build errors.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Arvind Sankar <nivedita@alum.mit.edu>
Cc: Borislav Petkov <bp@alien8.de>
Cc: James Morse <james.morse@arm.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: https://lkml.kernel.org/r/20191224151025.32482-24-ardb@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-12-25 10:49:25 +01:00

164 lines
5.0 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_EFI_H
#define _ASM_EFI_H
#include <asm/boot.h>
#include <asm/cpufeature.h>
#include <asm/fpsimd.h>
#include <asm/io.h>
#include <asm/memory.h>
#include <asm/mmu_context.h>
#include <asm/neon.h>
#include <asm/ptrace.h>
#include <asm/tlbflush.h>
#ifdef CONFIG_EFI
extern void efi_init(void);
#else
#define efi_init()
#endif
int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
#define arch_efi_call_virt_setup() \
({ \
efi_virtmap_load(); \
__efi_fpsimd_begin(); \
})
#define arch_efi_call_virt(p, f, args...) \
({ \
efi_##f##_t *__f; \
__f = p->f; \
__efi_rt_asm_wrapper(__f, #f, args); \
})
#define arch_efi_call_virt_teardown() \
({ \
__efi_fpsimd_end(); \
efi_virtmap_unload(); \
})
efi_status_t __efi_rt_asm_wrapper(void *, const char *, ...);
#define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
/*
* Even when Linux uses IRQ priorities for IRQ disabling, EFI does not.
* And EFI shouldn't really play around with priority masking as it is not aware
* which priorities the OS has assigned to its interrupts.
*/
#define arch_efi_save_flags(state_flags) \
((void)((state_flags) = read_sysreg(daif)))
#define arch_efi_restore_flags(state_flags) write_sysreg(state_flags, daif)
/* arch specific definitions used by the stub code */
/*
* AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
* start of kernel and may not cross a 2MiB boundary. We set alignment to
* 2MiB so we know it won't cross a 2MiB boundary.
*/
#define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
/*
* In some configurations (e.g. VMAP_STACK && 64K pages), stacks built into the
* kernel need greater alignment than we require the segments to be padded to.
*/
#define EFI_KIMG_ALIGN \
(SEGMENT_ALIGN > THREAD_ALIGN ? SEGMENT_ALIGN : THREAD_ALIGN)
/* on arm64, the FDT may be located anywhere in system RAM */
static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base)
{
return ULONG_MAX;
}
/*
* On arm64, we have to ensure that the initrd ends up in the linear region,
* which is a 1 GB aligned region of size '1UL << (VA_BITS_MIN - 1)' that is
* guaranteed to cover the kernel Image.
*
* Since the EFI stub is part of the kernel Image, we can relax the
* usual requirements in Documentation/arm64/booting.rst, which still
* apply to other bootloaders, and are required for some kernel
* configurations.
*/
static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base,
unsigned long image_addr)
{
return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS_MIN - 1));
}
#define efi_bs_call(func, ...) efi_system_table()->boottime->func(__VA_ARGS__)
#define efi_rt_call(func, ...) efi_system_table()->runtime->func(__VA_ARGS__)
#define efi_is_native() (true)
#define efi_table_attr(inst, attr) (inst->attr)
#define efi_call_proto(inst, func, ...) inst->func(inst, ##__VA_ARGS__)
#define alloc_screen_info(x...) &screen_info
static inline void free_screen_info(struct screen_info *si)
{
}
/* redeclare as 'hidden' so the compiler will generate relative references */
extern struct screen_info screen_info __attribute__((__visibility__("hidden")));
static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
{
}
#define EFI_ALLOC_ALIGN SZ_64K
/*
* On ARM systems, virtually remapped UEFI runtime services are set up in two
* distinct stages:
* - The stub retrieves the final version of the memory map from UEFI, populates
* the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
* service to communicate the new mapping to the firmware (Note that the new
* mapping is not live at this time)
* - During an early initcall(), the EFI system table is permanently remapped
* and the virtual remapping of the UEFI Runtime Services regions is loaded
* into a private set of page tables. If this all succeeds, the Runtime
* Services are enabled and the EFI_RUNTIME_SERVICES bit set.
*/
static inline void efi_set_pgd(struct mm_struct *mm)
{
__switch_mm(mm);
if (system_uses_ttbr0_pan()) {
if (mm != current->active_mm) {
/*
* Update the current thread's saved ttbr0 since it is
* restored as part of a return from exception. Enable
* access to the valid TTBR0_EL1 and invoke the errata
* workaround directly since there is no return from
* exception when invoking the EFI run-time services.
*/
update_saved_ttbr0(current, mm);
uaccess_ttbr0_enable();
post_ttbr_update_workaround();
} else {
/*
* Defer the switch to the current thread's TTBR0_EL1
* until uaccess_enable(). Restore the current
* thread's saved ttbr0 corresponding to its active_mm
*/
uaccess_ttbr0_disable();
update_saved_ttbr0(current, current->active_mm);
}
}
}
void efi_virtmap_load(void);
void efi_virtmap_unload(void);
#endif /* _ASM_EFI_H */