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24d7c494ce
The FDT is mapped via a fixmap entry that is at least 2 MB in size and 2 MB aligned on 4 KB page size kernels. On UEFI systems, the FDT allocation may share this 2 MB mapping with a reserved region (or another memory region that we should never map), unless we account for this in the size of the allocation (the alignment is already 2 MB) So instead of taking guesses at the needed space, simply allocate 2 MB immediately. The allocation will be recorded as EFI_LOADER_DATA, and the kernel only memblock_reserve()'s the actual size of the FDT, so the unused space will be released back to the kernel. Reviewed-By: Jeffrey Hugo <jhugo@codeaurora.org> Tested-by: Richard Ruigrok <rruigrok@codeaurora.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/20170404160245.27812-6-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
135 lines
4.0 KiB
C
135 lines
4.0 KiB
C
#ifndef _ASM_EFI_H
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#define _ASM_EFI_H
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#include <asm/boot.h>
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#include <asm/cpufeature.h>
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#include <asm/io.h>
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#include <asm/mmu_context.h>
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#include <asm/neon.h>
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#include <asm/ptrace.h>
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#include <asm/tlbflush.h>
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#ifdef CONFIG_EFI
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extern void efi_init(void);
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#else
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#define efi_init()
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#endif
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int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
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int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
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#define arch_efi_call_virt_setup() \
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({ \
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kernel_neon_begin(); \
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efi_virtmap_load(); \
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})
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#define arch_efi_call_virt(p, f, args...) \
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({ \
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efi_##f##_t *__f; \
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__f = p->f; \
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__f(args); \
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})
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#define arch_efi_call_virt_teardown() \
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({ \
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efi_virtmap_unload(); \
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kernel_neon_end(); \
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})
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#define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
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/* arch specific definitions used by the stub code */
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/*
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* AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
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* start of kernel and may not cross a 2MiB boundary. We set alignment to
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* 2MiB so we know it won't cross a 2MiB boundary.
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*/
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#define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */
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/* on arm64, the FDT may be located anywhere in system RAM */
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static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base)
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{
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return ULONG_MAX;
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}
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/*
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* On arm64, we have to ensure that the initrd ends up in the linear region,
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* which is a 1 GB aligned region of size '1UL << (VA_BITS - 1)' that is
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* guaranteed to cover the kernel Image.
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*
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* Since the EFI stub is part of the kernel Image, we can relax the
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* usual requirements in Documentation/arm64/booting.txt, which still
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* apply to other bootloaders, and are required for some kernel
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* configurations.
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*/
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static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base,
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unsigned long image_addr)
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{
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return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS - 1));
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}
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#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
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#define __efi_call_early(f, ...) f(__VA_ARGS__)
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#define efi_call_runtime(f, ...) sys_table_arg->runtime->f(__VA_ARGS__)
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#define efi_is_64bit() (true)
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#define efi_call_proto(protocol, f, instance, ...) \
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((protocol##_t *)instance)->f(instance, ##__VA_ARGS__)
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#define alloc_screen_info(x...) &screen_info
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#define free_screen_info(x...)
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static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
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{
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}
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#define EFI_ALLOC_ALIGN SZ_64K
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/*
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* On ARM systems, virtually remapped UEFI runtime services are set up in two
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* distinct stages:
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* - The stub retrieves the final version of the memory map from UEFI, populates
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* the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
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* service to communicate the new mapping to the firmware (Note that the new
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* mapping is not live at this time)
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* - During an early initcall(), the EFI system table is permanently remapped
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* and the virtual remapping of the UEFI Runtime Services regions is loaded
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* into a private set of page tables. If this all succeeds, the Runtime
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* Services are enabled and the EFI_RUNTIME_SERVICES bit set.
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*/
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static inline void efi_set_pgd(struct mm_struct *mm)
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{
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__switch_mm(mm);
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if (system_uses_ttbr0_pan()) {
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if (mm != current->active_mm) {
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/*
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* Update the current thread's saved ttbr0 since it is
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* restored as part of a return from exception. Set
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* the hardware TTBR0_EL1 using cpu_switch_mm()
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* directly to enable potential errata workarounds.
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*/
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update_saved_ttbr0(current, mm);
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cpu_switch_mm(mm->pgd, mm);
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} else {
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/*
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* Defer the switch to the current thread's TTBR0_EL1
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* until uaccess_enable(). Restore the current
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* thread's saved ttbr0 corresponding to its active_mm
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* (if different from init_mm).
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*/
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cpu_set_reserved_ttbr0();
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if (current->active_mm != &init_mm)
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update_saved_ttbr0(current, current->active_mm);
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}
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}
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}
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void efi_virtmap_load(void);
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void efi_virtmap_unload(void);
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#endif /* _ASM_EFI_H */
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