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24a295e4ef
While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, or when dealing with UAPI headers that rather should use __ASSEMBLER__ instead. So let's standardize on the __ASSEMBLER__ macro that is provided by the compilers now. This is mostly a mechanical patch (done with a simple "sed -i" statement), with some manual tweaks in <asm/frame.h>, <asm/hw_irq.h> and <asm/setup.h> that mentioned this macro in comments with some missing underscores. Signed-off-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Brian Gerst <brgerst@gmail.com> Cc: Juergen Gross <jgross@suse.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/20250314071013.1575167-38-thuth@redhat.com
200 lines
6 KiB
C
200 lines
6 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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*
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* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
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* x86_32 and x86_64 integration by Gustavo F. Padovan, February 2009
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*/
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#ifndef _ASM_X86_FIXMAP_H
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#define _ASM_X86_FIXMAP_H
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#include <asm/kmap_size.h>
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/*
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* Exposed to assembly code for setting up initial page tables. Cannot be
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* calculated in assembly code (fixmap entries are an enum), but is sanity
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* checked in the actual fixmap C code to make sure that the fixmap is
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* covered fully.
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*/
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#ifndef CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP
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# define FIXMAP_PMD_NUM 2
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#else
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# define KM_PMDS (KM_MAX_IDX * ((CONFIG_NR_CPUS + 511) / 512))
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# define FIXMAP_PMD_NUM (KM_PMDS + 2)
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#endif
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/* fixmap starts downwards from the 507th entry in level2_fixmap_pgt */
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#define FIXMAP_PMD_TOP 507
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#ifndef __ASSEMBLER__
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#include <linux/kernel.h>
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#include <asm/apicdef.h>
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#include <asm/page.h>
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#include <asm/pgtable_types.h>
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#ifdef CONFIG_X86_32
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#include <linux/threads.h>
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#else
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#include <uapi/asm/vsyscall.h>
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#endif
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/*
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* We can't declare FIXADDR_TOP as variable for x86_64 because vsyscall
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* uses fixmaps that relies on FIXADDR_TOP for proper address calculation.
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* Because of this, FIXADDR_TOP x86 integration was left as later work.
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*/
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#ifdef CONFIG_X86_32
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/*
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* Leave one empty page between vmalloc'ed areas and
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* the start of the fixmap.
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*/
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extern unsigned long __FIXADDR_TOP;
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#define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
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#else
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#define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
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PAGE_SIZE)
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#endif
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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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* for x86_32: We allocate these special addresses
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* from the end of virtual memory (0xfffff000) backwards.
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* Also this lets us do fail-safe vmalloc(), we
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* can guarantee that these special addresses and
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* vmalloc()-ed addresses never overlap.
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*
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* These 'compile-time allocated' memory buffers are
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* fixed-size 4k pages (or larger if used with an increment
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* higher than 1). Use set_fixmap(idx,phys) to associate
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* physical memory with fixmap indices.
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*
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* TLB entries of such buffers will not be flushed across
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* task switches.
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*/
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enum fixed_addresses {
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#ifdef CONFIG_X86_32
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FIX_HOLE,
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#else
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#ifdef CONFIG_X86_VSYSCALL_EMULATION
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VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
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#endif
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#endif
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FIX_DBGP_BASE,
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FIX_EARLYCON_MEM_BASE,
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#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
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FIX_OHCI1394_BASE,
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#endif
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#ifdef CONFIG_X86_LOCAL_APIC
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FIX_APIC_BASE, /* local (CPU) APIC) -- required for SMP or not */
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#endif
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#ifdef CONFIG_X86_IO_APIC
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FIX_IO_APIC_BASE_0,
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FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1,
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#endif
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#ifdef CONFIG_KMAP_LOCAL
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FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
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FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1,
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#ifdef CONFIG_PCI_MMCONFIG
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FIX_PCIE_MCFG,
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#endif
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#endif
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#ifdef CONFIG_PARAVIRT_XXL
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FIX_PARAVIRT_BOOTMAP,
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#endif
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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_NMI,
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#endif
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__end_of_permanent_fixed_addresses,
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/*
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* 512 temporary boot-time mappings, used by early_ioremap(),
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* before ioremap() is functional.
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*
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* If necessary we round it up to the next 512 pages boundary so
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* that we can have a single pmd entry and a single pte table:
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*/
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#define NR_FIX_BTMAPS 64
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#define FIX_BTMAPS_SLOTS 8
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#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
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FIX_BTMAP_END =
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(__end_of_permanent_fixed_addresses ^
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(__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &
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-PTRS_PER_PTE
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? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -
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(__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))
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: __end_of_permanent_fixed_addresses,
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FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
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#ifdef CONFIG_X86_32
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FIX_WP_TEST,
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#endif
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#ifdef CONFIG_INTEL_TXT
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FIX_TBOOT_BASE,
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#endif
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__end_of_fixed_addresses
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};
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extern void reserve_top_address(unsigned long reserve);
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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 FIXADDR_TOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
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#define FIXADDR_TOT_START (FIXADDR_TOP - FIXADDR_TOT_SIZE)
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extern int fixmaps_set;
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extern pte_t *pkmap_page_table;
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void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
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void native_set_fixmap(unsigned /* enum fixed_addresses */ idx,
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phys_addr_t phys, pgprot_t flags);
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#ifndef CONFIG_PARAVIRT_XXL
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static inline void __set_fixmap(enum fixed_addresses idx,
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phys_addr_t phys, pgprot_t flags)
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{
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native_set_fixmap(idx, phys, flags);
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}
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#endif
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/*
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* FIXMAP_PAGE_NOCACHE is used for MMIO. Memory encryption is not
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* supported for MMIO addresses, so make sure that the memory encryption
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* mask is not part of the page attributes.
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*/
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#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_IO_NOCACHE
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/*
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* Early memremap routines used for in-place encryption. The mappings created
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* by these routines are intended to be used as temporary mappings.
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*/
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void __init *early_memremap_encrypted(resource_size_t phys_addr,
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unsigned long size);
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void __init *early_memremap_encrypted_wp(resource_size_t phys_addr,
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unsigned long size);
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void __init *early_memremap_decrypted(resource_size_t phys_addr,
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unsigned long size);
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void __init *early_memremap_decrypted_wp(resource_size_t phys_addr,
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unsigned long size);
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#include <asm-generic/fixmap.h>
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#define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags)
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#define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0))
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void __early_set_fixmap(enum fixed_addresses idx,
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phys_addr_t phys, pgprot_t flags);
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#endif /* !__ASSEMBLER__ */
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#endif /* _ASM_X86_FIXMAP_H */
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