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/* 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
 12#ifdef __i386__
 13
 14#include <linux/pfn.h>
 15/*
 16 * Reserved space for vmalloc and iomap - defined in asm/page.h
 17 */
 18#define MAXMEM_PFN	PFN_DOWN(MAXMEM)
 19#define MAX_NONPAE_PFN	(1 << 20)
 20
 21#endif /* __i386__ */
 22
 23#define PARAM_SIZE 4096		/* sizeof(struct boot_params) */
 24
 25#define OLD_CL_MAGIC		0xA33F
 26#define OLD_CL_ADDRESS		0x020	/* Relative to real mode data */
 27#define NEW_CL_POINTER		0x228	/* Relative to real mode data */
 28
 29#ifndef __ASSEMBLY__
 30#include <asm/bootparam.h>
 31#include <asm/x86_init.h>
 32
 33extern u64 relocated_ramdisk;
 34
 35/* Interrupt control for vSMPowered x86_64 systems */
 36#ifdef CONFIG_X86_64
 37void vsmp_init(void);
 38#else
 39static inline void vsmp_init(void) { }
 40#endif
 41
 
 
 42void setup_bios_corruption_check(void);
 43void early_platform_quirks(void);
 44
 45extern unsigned long saved_video_mode;
 46
 47extern void reserve_standard_io_resources(void);
 48extern void i386_reserve_resources(void);
 49extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp);
 50extern unsigned long __startup_secondary_64(void);
 51extern int early_make_pgtable(unsigned long address);
 
 52
 53#ifdef CONFIG_X86_INTEL_MID
 54extern void x86_intel_mid_early_setup(void);
 55#else
 56static inline void x86_intel_mid_early_setup(void) { }
 57#endif
 58
 59#ifdef CONFIG_X86_INTEL_CE
 60extern void x86_ce4100_early_setup(void);
 61#else
 62static inline void x86_ce4100_early_setup(void) { }
 63#endif
 64
 65#ifndef _SETUP
 66
 67#include <asm/espfix.h>
 68#include <linux/kernel.h>
 69
 70/*
 71 * This is set up by the setup-routine at boot-time
 72 */
 73extern struct boot_params boot_params;
 74extern char _text[];
 75
 76static inline bool kaslr_enabled(void)
 77{
 78	return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) &&
 79		!!(boot_params.hdr.loadflags & KASLR_FLAG);
 80}
 81
 82/*
 83 * Apply no randomization if KASLR was disabled at boot or if KASAN
 84 * is enabled. KASAN shadow mappings rely on regions being PGD aligned.
 85 */
 86static inline bool kaslr_memory_enabled(void)
 87{
 88	return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN);
 89}
 90
 91static inline unsigned long kaslr_offset(void)
 92{
 93	return (unsigned long)&_text - __START_KERNEL;
 94}
 95
 96/*
 97 * Do NOT EVER look at the BIOS memory size location.
 98 * It does not work on many machines.
 99 */
100#define LOWMEMSIZE()	(0x9f000)
101
102/* exceedingly early brk-like allocator */
103extern unsigned long _brk_end;
104void *extend_brk(size_t size, size_t align);
105
106/*
107 * Reserve space in the brk section.  The name must be unique within
108 * the file, and somewhat descriptive.  The size is in bytes.  Must be
109 * used at file scope.
 
110 *
111 * (This uses a temp function to wrap the asm so we can pass it the
112 * size parameter; otherwise we wouldn't be able to.  We can't use a
113 * "section" attribute on a normal variable because it always ends up
114 * being @progbits, which ends up allocating space in the vmlinux
115 * executable.)
116 */
117#define RESERVE_BRK(name,sz)						\
118	static void __section(.discard.text) __used notrace		\
119	__brk_reservation_fn_##name##__(void) {				\
120		asm volatile (						\
121			".pushsection .brk_reservation,\"aw\",@nobits;" \
122			".brk." #name ":"				\
123			" 1:.skip %c0;"					\
124			" .size .brk." #name ", . - 1b;"		\
125			" .popsection"					\
126			: : "i" (sz));					\
127	}
128
129/* Helper for reserving space for arrays of things */
130#define RESERVE_BRK_ARRAY(type, name, entries)		\
131	type *name;					\
132	RESERVE_BRK(name, sizeof(type) * entries)
133
134extern void probe_roms(void);
 
 
 
135#ifdef __i386__
136
137asmlinkage void __init i386_start_kernel(void);
138
139#else
140asmlinkage void __init x86_64_start_kernel(char *real_mode);
141asmlinkage void __init x86_64_start_reservations(char *real_mode_data);
142
143#endif /* __i386__ */
144#endif /* _SETUP */
145#else
146#define RESERVE_BRK(name,sz)				\
147	.pushsection .brk_reservation,"aw",@nobits;	\
148.brk.name:						\
1491:	.skip sz;					\
150	.size .brk.name,.-1b;				\
 
 
151	.popsection
 
 
 
 
152#endif /* __ASSEMBLY__ */
 
153#endif /* _ASM_X86_SETUP_H */