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 __ASSEMBLY__ 13 14 #include <linux/types.h> 15 #include <asm/io.h> 16 17 /* This must match data at realmode/rm/header.S */ 18 struct 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_X86_64 25 u32 trampoline_pgd; 26 #endif 27 /* ACPI S3 wakeup */ 28 #ifdef CONFIG_ACPI_SLEEP 29 u32 wakeup_start; 30 u32 wakeup_header; 31 #endif 32 /* APM/BIOS reboot */ 33 u32 machine_real_restart_asm; 34 #ifdef CONFIG_X86_64 35 u32 machine_real_restart_seg; 36 #endif 37 }; 38 39 /* This must match data at realmode/rm/trampoline_{32,64}.S */ 40 struct trampoline_header { 41 #ifdef CONFIG_X86_32 42 u32 start; 43 u16 gdt_pad; 44 u16 gdt_limit; 45 u32 gdt_base; 46 #else 47 u64 start; 48 u64 efer; 49 u32 cr4; 50 u32 flags; 51 #endif 52 }; 53 54 extern struct real_mode_header *real_mode_header; 55 extern unsigned char real_mode_blob_end[]; 56 57 extern unsigned long initial_code; 58 extern unsigned long initial_gs; 59 extern unsigned long initial_stack; 60 61 extern unsigned char real_mode_blob[]; 62 extern unsigned char real_mode_relocs[]; 63 64 #ifdef CONFIG_X86_32 65 extern unsigned char startup_32_smp[]; 66 extern unsigned char boot_gdt[]; 67 #else 68 extern unsigned char secondary_startup_64[]; 69 #endif 70 71 static inline size_t real_mode_size_needed(void) 72 { 73 if (real_mode_header) 74 return 0; /* already allocated. */ 75 76 return ALIGN(real_mode_blob_end - real_mode_blob, PAGE_SIZE); 77 } 78 79 static inline void set_real_mode_mem(phys_addr_t mem) 80 { 81 real_mode_header = (struct real_mode_header *) __va(mem); 82 } 83 84 void reserve_real_mode(void); 85 86 #endif /* __ASSEMBLY__ */ 87 88 #endif /* _ARCH_X86_REALMODE_H */ 89