realmode.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef _ARCH_X86_REALMODE_H
  3#define _ARCH_X86_REALMODE_H
  4
  5/*
  6 * Flag bit definitions for use with the flags field of the trampoline header
  7 * in the CONFIG_X86_64 variant.
  8 */
  9#define TH_FLAGS_SME_ACTIVE_BIT		0
 10#define TH_FLAGS_SME_ACTIVE		BIT(TH_FLAGS_SME_ACTIVE_BIT)
 11
 12#ifndef __ASSEMBLER__
 13
 14#include <linux/types.h>
 15#include <asm/io.h>
 16
 17/* This must match data at realmode/rm/header.S */
 18struct real_mode_header {
 19	u32	text_start;
 20	u32	ro_end;
 21	/* SMP trampoline */
 22	u32	trampoline_start;
 23	u32	trampoline_header;
 24#ifdef CONFIG_AMD_MEM_ENCRYPT
 25	u32	sev_es_trampoline_start;
 26#endif
 27#ifdef CONFIG_X86_64
 28	u32	trampoline_start64;
 29	u32	trampoline_pgd;
 30#endif
 31	/* ACPI S3 wakeup */
 32#ifdef CONFIG_ACPI_SLEEP
 33	u32	wakeup_start;
 34	u32	wakeup_header;
 35#endif
 36	/* APM/BIOS reboot */
 37	u32	machine_real_restart_asm;
 38#ifdef CONFIG_X86_64
 39	u32	machine_real_restart_seg;
 40#endif
 41};
 42
 43/* This must match data at realmode/rm/trampoline_{32,64}.S */
 44struct trampoline_header {
 45#ifdef CONFIG_X86_32
 46	u32 start;
 47	u16 gdt_pad;
 48	u16 gdt_limit;
 49	u32 gdt_base;
 50#else
 51	u64 start;
 52	u64 efer;
 53	u32 cr4;
 54	u32 flags;
 55	u32 lock;
 56#endif
 57};
 58
 59extern struct real_mode_header *real_mode_header;
 60extern unsigned char real_mode_blob_end[];
 61
 62extern unsigned long initial_code;
 63extern unsigned long initial_stack;
 64#ifdef CONFIG_AMD_MEM_ENCRYPT
 65extern unsigned long initial_vc_handler;
 66#endif
 67
 68extern u32 *trampoline_lock;
 69
 70extern unsigned char real_mode_blob[];
 71extern unsigned char real_mode_relocs[];
 72
 73#ifdef CONFIG_X86_32
 74extern unsigned char startup_32_smp[];
 75extern unsigned char boot_gdt[];
 76#else
 77extern unsigned char secondary_startup_64[];
 78extern unsigned char secondary_startup_64_no_verify[];
 79#endif
 80
 81static __always_inline size_t real_mode_size_needed(void)
 82{
 83	if (real_mode_header)
 84		return 0;	/* already allocated. */
 85
 86	return ALIGN(real_mode_blob_end - real_mode_blob, PAGE_SIZE);
 87}
 88
 89static inline void set_real_mode_mem(phys_addr_t mem)
 90{
 91	real_mode_header = (struct real_mode_header *) __va(mem);
 92}
 93
 94void reserve_real_mode(void);
 95void load_trampoline_pgtable(void);
 96void init_real_mode(void);
 97
 98#endif /* __ASSEMBLER__ */
 99
100#endif /* _ARCH_X86_REALMODE_H */