mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-09-18 23:09:29 +02:00
Pratyush Yadav (Google)
08412b8c70
x86 asm/setup.h includes linux/kexec_handover.h. This is because it is used by setup.c and kaslr.c. But this inclusion is problematic. The header is included in many places, so it results in the KHO header being propagated there. Also, the setup header is used by realmode code. If KHO header includes things like mm.h, it causes a big dump of compilation failures. Nothing in setup.h uses anything from KHO. Remove the header from setup.h, and directly include it in setup.c. which does use things from KHO. Since kaslr.c is a part of the decompressor, avoid including linux headers there directly. Instead, split out struct kho_scratch, which is the only thing the kaslr.c uses, and move it to include/asm-generic/kexec_handover.h. This should also help reduce files recompiled when kexec_handover.h changes. Signed-off-by: Pratyush Yadav (Google) <pratyush@kernel.org> Acked-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://patch.msgid.link/20260706153751.1166003-1-pratyush@kernel.org Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
162 lines
3.9 KiB
C
162 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_SETUP_H
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#define _ASM_X86_SETUP_H
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#include <uapi/asm/setup.h>
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#define COMMAND_LINE_SIZE 2048
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#include <linux/linkage.h>
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#include <asm/page_types.h>
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#include <asm/ibt.h>
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#ifdef __i386__
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#include <linux/pfn.h>
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/*
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* Reserved space for vmalloc and iomap - defined in asm/page.h
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*/
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#define MAXMEM_PFN PFN_DOWN(MAXMEM)
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#define MAX_NONPAE_PFN (1 << 20)
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#endif /* __i386__ */
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#define PARAM_SIZE 4096 /* sizeof(struct boot_params) */
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#define OLD_CL_MAGIC 0xA33F
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#define OLD_CL_ADDRESS 0x020 /* Relative to real mode data */
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#define NEW_CL_POINTER 0x228 /* Relative to real mode data */
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#ifndef __ASSEMBLER__
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#include <linux/cache.h>
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#include <asm/bootparam.h>
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#include <asm/x86_init.h>
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/* Interrupt control for vSMPowered x86_64 systems */
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#ifdef CONFIG_X86_64
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void vsmp_init(void);
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#else
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static inline void vsmp_init(void) { }
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#endif
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struct pt_regs;
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void setup_bios_corruption_check(void);
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void early_platform_quirks(void);
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extern unsigned long saved_video_mode;
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extern unsigned long acpi_realmode_flags;
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extern void reserve_standard_io_resources(void);
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extern void i386_reserve_resources(void);
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extern unsigned long __startup_64(unsigned long p2v_offset, struct boot_params *bp);
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extern void startup_64_setup_gdt_idt(void);
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extern void startup_64_load_idt(void *vc_handler);
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extern void __pi_startup_64_load_idt(void *vc_handler);
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extern void early_setup_idt(void);
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extern void __init do_early_exception(struct pt_regs *regs, int trapnr);
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#ifdef CONFIG_X86_INTEL_MID
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extern void x86_intel_mid_early_setup(void);
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#else
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static inline void x86_intel_mid_early_setup(void) { }
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#endif
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#ifdef CONFIG_X86_INTEL_CE
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extern void x86_ce4100_early_setup(void);
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#else
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static inline void x86_ce4100_early_setup(void) { }
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#endif
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#ifndef _SETUP
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#include <asm/espfix.h>
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#include <linux/kernel.h>
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/*
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* This is set up by the setup-routine at boot-time
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*/
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extern struct boot_params boot_params;
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extern char _text[];
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static inline bool kaslr_enabled(void)
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{
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return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) &&
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!!(boot_params.hdr.loadflags & KASLR_FLAG);
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}
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/*
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* Apply no randomization if KASLR was disabled at boot or if KASAN
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* is enabled. KASAN shadow mappings rely on regions being PGD aligned.
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*/
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static inline bool kaslr_memory_enabled(void)
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{
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return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN);
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}
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static inline unsigned long kaslr_offset(void)
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{
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return (unsigned long)&_text - __START_KERNEL;
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}
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/*
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* Do NOT EVER look at the BIOS memory size location.
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* It does not work on many machines.
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*/
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#define LOWMEMSIZE() (0x9f000)
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/* exceedingly early brk-like allocator */
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extern unsigned long _brk_end;
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void *extend_brk(size_t size, size_t align);
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/*
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* Reserve space in the .brk section, which is a block of memory from which the
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* caller is allowed to allocate very early (before even memblock is available)
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* by calling extend_brk(). All allocated memory will be eventually converted
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* to memblock. Any leftover unallocated memory will be freed.
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*
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* The size is in bytes.
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*/
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#define RESERVE_BRK(name, size) \
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__section(".bss..brk") __aligned(1) __used \
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static char __brk_##name[size]
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extern void probe_roms(void);
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void clear_bss(void);
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#ifdef __i386__
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asmlinkage void __init __noreturn i386_start_kernel(void);
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void __init mk_early_pgtbl_32(void);
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#else
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asmlinkage void __init __noreturn x86_64_start_kernel(char *real_mode);
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asmlinkage void __init __noreturn x86_64_start_reservations(char *real_mode_data);
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#endif /* __i386__ */
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#endif /* _SETUP */
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#ifdef CONFIG_CMDLINE_BOOL
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extern bool builtin_cmdline_added __ro_after_init;
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#else
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#define builtin_cmdline_added 0
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#endif
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#else /* __ASSEMBLER__ */
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.macro __RESERVE_BRK name, size
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.pushsection .bss..brk, "aw"
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SYM_DATA_START(__brk_\name)
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.skip \size
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SYM_DATA_END(__brk_\name)
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.popsection
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.endm
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#define RESERVE_BRK(name, size) __RESERVE_BRK name, size
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#endif /* __ASSEMBLER__ */
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#endif /* _ASM_X86_SETUP_H */
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