1c9a8e8768
Get rid of some clunky open coded arithmetic on section addresses, by emitting the trampoline data variables into a separate, dedicated r/o data section, and putting it at the next page boundary. This way, we can access the literals via single LDR instruction. While at it, get rid of other, implicit literals, and use ADRP/ADD or MOVZ/MOVK sequences, as appropriate. Note that the latter are only supported for CONFIG_RELOCATABLE=n (which is usually the case if CONFIG_RANDOMIZE_BASE=n), so update the CPP conditionals to reflect this. Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20220622161010.3845775-1-ardb@kernel.org Signed-off-by: Will Deacon <will@kernel.org>
116 lines
3.1 KiB
C
116 lines
3.1 KiB
C
/*
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* fixmap.h: compile-time virtual memory allocation
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1998 Ingo Molnar
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* Copyright (C) 2013 Mark Salter <msalter@redhat.com>
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*
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* Adapted from arch/x86 version.
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*
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*/
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#ifndef _ASM_ARM64_FIXMAP_H
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#define _ASM_ARM64_FIXMAP_H
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#ifndef __ASSEMBLY__
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#include <linux/kernel.h>
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#include <linux/sizes.h>
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#include <asm/boot.h>
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#include <asm/page.h>
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#include <asm/pgtable-prot.h>
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/*
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* Here we define all the compile-time 'special' virtual
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* addresses. The point is to have a constant address at
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* compile time, but to set the physical address only
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* in the boot process.
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*
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* Each enum increment in these 'compile-time allocated'
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* memory buffers is page-sized. Use set_fixmap(idx,phys)
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* to associate physical memory with a fixmap index.
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*/
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enum fixed_addresses {
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FIX_HOLE,
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/*
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* Reserve a virtual window for the FDT that is 2 MB larger than the
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* maximum supported size, and put it at the top of the fixmap region.
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* The additional space ensures that any FDT that does not exceed
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* MAX_FDT_SIZE can be mapped regardless of whether it crosses any
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* 2 MB alignment boundaries.
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*
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* Keep this at the top so it remains 2 MB aligned.
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*/
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#define FIX_FDT_SIZE (MAX_FDT_SIZE + SZ_2M)
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FIX_FDT_END,
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FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1,
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FIX_EARLYCON_MEM_BASE,
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FIX_TEXT_POKE0,
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#ifdef CONFIG_ACPI_APEI_GHES
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/* Used for GHES mapping from assorted contexts */
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FIX_APEI_GHES_IRQ,
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FIX_APEI_GHES_SEA,
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#ifdef CONFIG_ARM_SDE_INTERFACE
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FIX_APEI_GHES_SDEI_NORMAL,
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FIX_APEI_GHES_SDEI_CRITICAL,
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#endif
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#endif /* CONFIG_ACPI_APEI_GHES */
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#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
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#ifdef CONFIG_RELOCATABLE
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FIX_ENTRY_TRAMP_TEXT4, /* one extra slot for the data page */
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#endif
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FIX_ENTRY_TRAMP_TEXT3,
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FIX_ENTRY_TRAMP_TEXT2,
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FIX_ENTRY_TRAMP_TEXT1,
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#define TRAMP_VALIAS (__fix_to_virt(FIX_ENTRY_TRAMP_TEXT1))
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#endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */
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__end_of_permanent_fixed_addresses,
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/*
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* Temporary boot-time mappings, used by early_ioremap(),
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* before ioremap() is functional.
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*/
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#define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE)
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#define FIX_BTMAPS_SLOTS 7
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#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
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FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
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FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
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/*
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* Used for kernel page table creation, so unmapped memory may be used
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* for tables.
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*/
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FIX_PTE,
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FIX_PMD,
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FIX_PUD,
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FIX_PGD,
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__end_of_fixed_addresses
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};
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#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
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#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
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#define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE)
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void __init early_fixmap_init(void);
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#define __early_set_fixmap __set_fixmap
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#define __late_set_fixmap __set_fixmap
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#define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
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extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
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#include <asm-generic/fixmap.h>
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_ARM64_FIXMAP_H */
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