7b26bf9e40
commit a1e2c031ec3949b8c039b739c0b5bf9c30007b00 upstream. RESERVE_BRK() reserves data in the .brk_reservation section. The data is initialized to zero, like BSS, so the macro specifies 'nobits' to prevent the data from taking up space in the vmlinux binary. The only way to get the compiler to do that (without putting the variable in .bss proper) is to use inline asm. The macro also has a hack which encloses the inline asm in a discarded function, which allows the size to be passed (global inline asm doesn't allow inputs). Remove the need for the discarded function hack by just stringifying the size rather than supplying it as an input to the inline asm. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20220506121631.133110232@infradead.org [nathan: Resolve conflict due to lack of 2b6ff7dea670] Signed-off-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
149 lines
3.8 KiB
C
Executable file
149 lines
3.8 KiB
C
Executable file
/* 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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#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 __ASSEMBLY__
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#include <asm/bootparam.h>
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#include <asm/x86_init.h>
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extern u64 relocated_ramdisk;
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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 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 physaddr, struct boot_params *bp);
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extern unsigned long __startup_secondary_64(void);
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extern void startup_64_setup_env(unsigned long physbase);
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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. The name must be unique within the file,
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* and somewhat descriptive. The size is in bytes.
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*
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* The allocation is done using inline asm (rather than using a section
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* attribute on a normal variable) in order to allow the use of @nobits, so
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* that it doesn't take up any space in the vmlinux file.
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*/
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#define RESERVE_BRK(name, size) \
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asm(".pushsection .brk_reservation,\"aw\",@nobits\n\t" \
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".brk." #name ":\n\t" \
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".skip " __stringify(size) "\n\t" \
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".size .brk." #name ", " __stringify(size) "\n\t" \
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".popsection\n\t")
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/* Helper for reserving space for arrays of things */
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#define RESERVE_BRK_ARRAY(type, name, entries) \
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type *name; \
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RESERVE_BRK(name, sizeof(type) * entries)
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extern void probe_roms(void);
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#ifdef __i386__
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asmlinkage void __init i386_start_kernel(void);
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#else
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asmlinkage void __init x86_64_start_kernel(char *real_mode);
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asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
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#endif /* __i386__ */
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#endif /* _SETUP */
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#else
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#define RESERVE_BRK(name,sz) \
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.pushsection .brk_reservation,"aw",@nobits; \
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.brk.name: \
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1: .skip sz; \
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.size .brk.name,.-1b; \
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.popsection
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_X86_SETUP_H */
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