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#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 __ASSEMBLER__
 31#include <linux/cache.h>
 32
 33#include <asm/bootparam.h>
 34#include <asm/x86_init.h>
 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;
 49extern unsigned long acpi_realmode_flags;
 50
 51extern void reserve_standard_io_resources(void);
 52extern void i386_reserve_resources(void);
 53extern unsigned long __startup_64(unsigned long p2v_offset, struct boot_params *bp);
 54extern void startup_64_setup_gdt_idt(void);
 55extern void startup_64_load_idt(void *vc_handler);
 56extern void __pi_startup_64_load_idt(void *vc_handler);
 57extern void early_setup_idt(void);
 58extern void __init do_early_exception(struct pt_regs *regs, int trapnr);
 59
 60#ifdef CONFIG_X86_INTEL_MID
 61extern void x86_intel_mid_early_setup(void);
 62#else
 63static inline void x86_intel_mid_early_setup(void) { }
 64#endif
 65
 66#ifdef CONFIG_X86_INTEL_CE
 67extern void x86_ce4100_early_setup(void);
 68#else
 69static inline void x86_ce4100_early_setup(void) { }
 70#endif
 71
 72#include <linux/kexec_handover.h>
 73
 74#ifndef _SETUP
 75
 76#include <asm/espfix.h>
 77#include <linux/kernel.h>
 78
 79/*
 80 * This is set up by the setup-routine at boot-time
 81 */
 82extern struct boot_params boot_params;
 83extern char _text[];
 84
 85static inline bool kaslr_enabled(void)
 86{
 87	return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) &&
 88		!!(boot_params.hdr.loadflags & KASLR_FLAG);
 89}
 90
 91/*
 92 * Apply no randomization if KASLR was disabled at boot or if KASAN
 93 * is enabled. KASAN shadow mappings rely on regions being PGD aligned.
 94 */
 95static inline bool kaslr_memory_enabled(void)
 96{
 97	return kaslr_enabled() && !IS_ENABLED(CONFIG_KASAN);
 98}
 99
100static inline unsigned long kaslr_offset(void)
101{
102	return (unsigned long)&_text - __START_KERNEL;
103}
104
105/*
106 * Do NOT EVER look at the BIOS memory size location.
107 * It does not work on many machines.
108 */
109#define LOWMEMSIZE()	(0x9f000)
110
111/* exceedingly early brk-like allocator */
112extern unsigned long _brk_end;
113void *extend_brk(size_t size, size_t align);
114
115/*
116 * Reserve space in the .brk section, which is a block of memory from which the
117 * caller is allowed to allocate very early (before even memblock is available)
118 * by calling extend_brk().  All allocated memory will be eventually converted
119 * to memblock.  Any leftover unallocated memory will be freed.
120 *
121 * The size is in bytes.
122 */
123#define RESERVE_BRK(name, size)					\
124	__section(".bss..brk") __aligned(1) __used	\
125	static char __brk_##name[size]
126
127extern void probe_roms(void);
128
129void clear_bss(void);
130
131#ifdef __i386__
132
133asmlinkage void __init __noreturn i386_start_kernel(void);
134void __init mk_early_pgtbl_32(void);
135
136#else
137asmlinkage void __init __noreturn x86_64_start_kernel(char *real_mode);
138asmlinkage void __init __noreturn x86_64_start_reservations(char *real_mode_data);
139
140#endif /* __i386__ */
141#endif /* _SETUP */
142
143#ifdef CONFIG_CMDLINE_BOOL
144extern bool builtin_cmdline_added __ro_after_init;
145#else
146#define builtin_cmdline_added 0
147#endif
148
149#else  /* __ASSEMBLER__ */
150
151.macro __RESERVE_BRK name, size
152	.pushsection .bss..brk, "aw"
153SYM_DATA_START(__brk_\name)
154	.skip \size
155SYM_DATA_END(__brk_\name)
156	.popsection
157.endm
158
159#define RESERVE_BRK(name, size) __RESERVE_BRK name, size
160
161#endif /* __ASSEMBLER__ */
162
163#endif /* _ASM_X86_SETUP_H */