1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef _ASM_X86_SETUP_H
  3#define _ASM_X86_SETUP_H
  4
  5#include <uapi/asm/setup.h>
  6
  7#define COMMAND_LINE_SIZE 2048
  8
  9#include <linux/linkage.h>
 10#include <asm/page_types.h>
 11#include <asm/ibt.h>
 12
 13#ifdef __i386__
 14
 15#include <linux/pfn.h>
 16/*
 17 * Reserved space for vmalloc and iomap - defined in asm/page.h
 18 */
 19#define MAXMEM_PFN	PFN_DOWN(MAXMEM)
 20#define MAX_NONPAE_PFN	(1 << 20)
 21
 22#endif /* __i386__ */
 23
 24#define PARAM_SIZE 4096		/* sizeof(struct boot_params) */
 25
 26#define OLD_CL_MAGIC		0xA33F
 27#define OLD_CL_ADDRESS		0x020	/* Relative to real mode data */
 28#define NEW_CL_POINTER		0x228	/* Relative to real mode data */
 29
 30#ifndef __ASSEMBLY__
 31#include <asm/bootparam.h>
 32#include <asm/x86_init.h>
 33
 34extern u64 relocated_ramdisk;
 35
 36/* Interrupt control for vSMPowered x86_64 systems */
 37#ifdef CONFIG_X86_64
 38void vsmp_init(void);
 39#else
 40static inline void vsmp_init(void) { }
 41#endif
 42
 43struct pt_regs;
 44
 45void setup_bios_corruption_check(void);
 46void early_platform_quirks(void);
 47
 48extern unsigned long saved_video_mode;
 49
 50extern void reserve_standard_io_resources(void);
 51extern void i386_reserve_resources(void);
 52extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp);
 53extern void startup_64_setup_env(unsigned long physbase);
 54extern void early_setup_idt(void);
 55extern void __init do_early_exception(struct pt_regs *regs, int trapnr);
 56
 57#ifdef CONFIG_X86_INTEL_MID
 58extern void x86_intel_mid_early_setup(void);
 59#else
 60static inline void x86_intel_mid_early_setup(void) { }
 61#endif
 62
 63#ifdef CONFIG_X86_INTEL_CE
 64extern void x86_ce4100_early_setup(void);
 65#else
 66static inline void x86_ce4100_early_setup(void) { }
 67#endif
 68
 69#ifndef _SETUP
 70
 71#include <asm/espfix.h>
 72#include <linux/kernel.h>
 73
 74/*
 75 * This is set up by the setup-routine at boot-time
 76 */
 77extern struct boot_params boot_params;
 78extern char _text[];
 79
 80static inline bool kaslr_enabled(void)
 81{
 82	return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) &&
 83		!!(boot_params.hdr.loadflags & KASLR_FLAG);
 84}
 85
 86/*
 87 * Apply no randomization if KASLR was disabled at boot or if KASAN
 88 * is enabled. KASAN shadow mappings rely on regions being PGD aligned.
 89 */
 90static inline bool kaslr_memory_enabled(void)
 91{
 92	return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN);
 93}
 94
 95static inline unsigned long kaslr_offset(void)
 96{
 97	return (unsigned long)&_text - __START_KERNEL;
 98}
 99
100/*
101 * Do NOT EVER look at the BIOS memory size location.
102 * It does not work on many machines.
103 */
104#define LOWMEMSIZE()	(0x9f000)
105
106/* exceedingly early brk-like allocator */
107extern unsigned long _brk_end;
108void *extend_brk(size_t size, size_t align);
109
110/*
111 * Reserve space in the .brk section, which is a block of memory from which the
112 * caller is allowed to allocate very early (before even memblock is available)
113 * by calling extend_brk().  All allocated memory will be eventually converted
114 * to memblock.  Any leftover unallocated memory will be freed.
115 *
116 * The size is in bytes.
 
 
 
 
117 */
118#define RESERVE_BRK(name, size)					\
119	__section(".bss..brk") __aligned(1) __used	\
120	static char __brk_##name[size]
 
 
 
 
 
 
 
 
 
 
 
 
 
121
122extern void probe_roms(void);
123
124void clear_bss(void);
125
126#ifdef __i386__
127
128asmlinkage void __init i386_start_kernel(void);
129
130#else
131asmlinkage void __init x86_64_start_kernel(char *real_mode);
132asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
133
134#endif /* __i386__ */
135#endif /* _SETUP */
136
137#else  /* __ASSEMBLY */
138
139.macro __RESERVE_BRK name, size
140	.pushsection .bss..brk, "aw"
141SYM_DATA_START(__brk_\name)
142	.skip \size
143SYM_DATA_END(__brk_\name)
144	.popsection
145.endm
146
147#define RESERVE_BRK(name, size) __RESERVE_BRK name, size
148
149#endif /* __ASSEMBLY__ */
150
151#endif /* _ASM_X86_SETUP_H */

 
  1#ifndef _ASM_X86_SETUP_H
  2#define _ASM_X86_SETUP_H
  3
  4#include <uapi/asm/setup.h>
  5
  6#define COMMAND_LINE_SIZE 2048
  7
  8#include <linux/linkage.h>
 
 
  9
 10#ifdef __i386__
 11
 12#include <linux/pfn.h>
 13/*
 14 * Reserved space for vmalloc and iomap - defined in asm/page.h
 15 */
 16#define MAXMEM_PFN	PFN_DOWN(MAXMEM)
 17#define MAX_NONPAE_PFN	(1 << 20)
 18
 19#endif /* __i386__ */
 20
 21#define PARAM_SIZE 4096		/* sizeof(struct boot_params) */
 22
 23#define OLD_CL_MAGIC		0xA33F
 24#define OLD_CL_ADDRESS		0x020	/* Relative to real mode data */
 25#define NEW_CL_POINTER		0x228	/* Relative to real mode data */
 26
 27#ifndef __ASSEMBLY__
 28#include <asm/bootparam.h>
 29#include <asm/x86_init.h>
 30
 31extern u64 relocated_ramdisk;
 32
 33/* Interrupt control for vSMPowered x86_64 systems */
 34#ifdef CONFIG_X86_64
 35void vsmp_init(void);
 36#else
 37static inline void vsmp_init(void) { }
 38#endif
 39
 
 
 40void setup_bios_corruption_check(void);
 
 41
 42extern unsigned long saved_video_mode;
 43
 44extern void reserve_standard_io_resources(void);
 45extern void i386_reserve_resources(void);
 46extern void setup_default_timer_irq(void);
 
 
 
 47
 48#ifdef CONFIG_X86_INTEL_MID
 49extern void x86_intel_mid_early_setup(void);
 50#else
 51static inline void x86_intel_mid_early_setup(void) { }
 52#endif
 53
 54#ifdef CONFIG_X86_INTEL_CE
 55extern void x86_ce4100_early_setup(void);
 56#else
 57static inline void x86_ce4100_early_setup(void) { }
 58#endif
 59
 60#ifndef _SETUP
 61
 
 
 
 62/*
 63 * This is set up by the setup-routine at boot-time
 64 */
 65extern struct boot_params boot_params;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 66
 67/*
 68 * Do NOT EVER look at the BIOS memory size location.
 69 * It does not work on many machines.
 70 */
 71#define LOWMEMSIZE()	(0x9f000)
 72
 73/* exceedingly early brk-like allocator */
 74extern unsigned long _brk_end;
 75void *extend_brk(size_t size, size_t align);
 76
 77/*
 78 * Reserve space in the brk section.  The name must be unique within
 79 * the file, and somewhat descriptive.  The size is in bytes.  Must be
 80 * used at file scope.
 
 81 *
 82 * (This uses a temp function to wrap the asm so we can pass it the
 83 * size parameter; otherwise we wouldn't be able to.  We can't use a
 84 * "section" attribute on a normal variable because it always ends up
 85 * being @progbits, which ends up allocating space in the vmlinux
 86 * executable.)
 87 */
 88#define RESERVE_BRK(name,sz)						\
 89	static void __section(.discard.text) __used notrace		\
 90	__brk_reservation_fn_##name##__(void) {				\
 91		asm volatile (						\
 92			".pushsection .brk_reservation,\"aw\",@nobits;" \
 93			".brk." #name ":"				\
 94			" 1:.skip %c0;"					\
 95			" .size .brk." #name ", . - 1b;"		\
 96			" .popsection"					\
 97			: : "i" (sz));					\
 98	}
 99
100/* Helper for reserving space for arrays of things */
101#define RESERVE_BRK_ARRAY(type, name, entries)		\
102	type *name;					\
103	RESERVE_BRK(name, sizeof(type) * entries)
104
105extern void probe_roms(void);
 
 
 
106#ifdef __i386__
107
108asmlinkage void __init i386_start_kernel(void);
109
110#else
111asmlinkage void __init x86_64_start_kernel(char *real_mode);
112asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
113
114#endif /* __i386__ */
115#endif /* _SETUP */
116#else
117#define RESERVE_BRK(name,sz)				\
118	.pushsection .brk_reservation,"aw",@nobits;	\
119.brk.name:						\
1201:	.skip sz;					\
121	.size .brk.name,.-1b;				\
 
 
122	.popsection
 
 
 
 
123#endif /* __ASSEMBLY__ */
 
124#endif /* _ASM_X86_SETUP_H */