1 files changed, 258 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
new file mode 100644
index 0000000000..cc70d3fb90
--- /dev/null
+++ b/arch/x86/boot/compressed/misc.h
@@ -0,0 +1,258 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef BOOT_COMPRESSED_MISC_H
+#define BOOT_COMPRESSED_MISC_H
+
+/*
+ * Special hack: we have to be careful, because no indirections are allowed here,
+ * and paravirt_ops is a kind of one. As it will only run in baremetal anyway,
+ * we just keep it from happening. (This list needs to be extended when new
+ * paravirt and debugging variants are added.)
+ */
+#undef CONFIG_PARAVIRT
+#undef CONFIG_PARAVIRT_XXL
+#undef CONFIG_PARAVIRT_SPINLOCKS
+#undef CONFIG_KASAN
+#undef CONFIG_KASAN_GENERIC
+
+#define __NO_FORTIFY
+
+/* cpu_feature_enabled() cannot be used this early */
+#define USE_EARLY_PGTABLE_L5
+
+/*
+ * Boot stub deals with identity mappings, physical and virtual addresses are
+ * the same, so override these defines.
+ *
+ * <asm/page.h> will not define them if they are already defined.
+ */
+#define __pa(x)  ((unsigned long)(x))
+#define __va(x)  ((void *)((unsigned long)(x)))
+
+#include <linux/linkage.h>
+#include <linux/screen_info.h>
+#include <linux/elf.h>
+#include <asm/page.h>
+#include <asm/boot.h>
+#include <asm/bootparam.h>
+#include <asm/desc_defs.h>
+
+#include "tdx.h"
+
+#define BOOT_CTYPE_H
+#include <linux/acpi.h>
+
+#define BOOT_BOOT_H
+#include "../ctype.h"
+#include "../io.h"
+
+#include "efi.h"
+
+#ifdef CONFIG_X86_64
+#define memptr long
+#else
+#define memptr unsigned
+#endif
+
+/* boot/compressed/vmlinux start and end markers */
+extern char _head[], _end[];
+
+/* misc.c */
+extern memptr free_mem_ptr;
+extern memptr free_mem_end_ptr;
+void *malloc(int size);
+void free(void *where);
+extern struct boot_params *boot_params;
+void __putstr(const char *s);
+void __puthex(unsigned long value);
+#define error_putstr(__x)  __putstr(__x)
+#define error_puthex(__x)  __puthex(__x)
+
+#ifdef CONFIG_X86_VERBOSE_BOOTUP
+
+#define debug_putstr(__x)  __putstr(__x)
+#define debug_puthex(__x)  __puthex(__x)
+#define debug_putaddr(__x) { \
+		debug_putstr(#__x ": 0x"); \
+		debug_puthex((unsigned long)(__x)); \
+		debug_putstr("\n"); \
+	}
+
+#else
+
+static inline void debug_putstr(const char *s)
+{ }
+static inline void debug_puthex(unsigned long value)
+{ }
+#define debug_putaddr(x) /* */
+
+#endif
+
+/* cmdline.c */
+int cmdline_find_option(const char *option, char *buffer, int bufsize);
+int cmdline_find_option_bool(const char *option);
+
+struct mem_vector {
+	u64 start;
+	u64 size;
+};
+
+#ifdef CONFIG_RANDOMIZE_BASE
+/* kaslr.c */
+void choose_random_location(unsigned long input,
+			    unsigned long input_size,
+			    unsigned long *output,
+			    unsigned long output_size,
+			    unsigned long *virt_addr);
+#else
+static inline void choose_random_location(unsigned long input,
+					  unsigned long input_size,
+					  unsigned long *output,
+					  unsigned long output_size,
+					  unsigned long *virt_addr)
+{
+}
+#endif
+
+/* cpuflags.c */
+bool has_cpuflag(int flag);
+
+#ifdef CONFIG_X86_64
+extern int set_page_decrypted(unsigned long address);
+extern int set_page_encrypted(unsigned long address);
+extern int set_page_non_present(unsigned long address);
+extern unsigned char _pgtable[];
+#endif
+
+#ifdef CONFIG_EARLY_PRINTK
+/* early_serial_console.c */
+extern int early_serial_base;
+void console_init(void);
+#else
+static const int early_serial_base;
+static inline void console_init(void)
+{ }
+#endif
+
+#ifdef CONFIG_AMD_MEM_ENCRYPT
+void sev_enable(struct boot_params *bp);
+void snp_check_features(void);
+void sev_es_shutdown_ghcb(void);
+extern bool sev_es_check_ghcb_fault(unsigned long address);
+void snp_set_page_private(unsigned long paddr);
+void snp_set_page_shared(unsigned long paddr);
+void sev_prep_identity_maps(unsigned long top_level_pgt);
+#else
+static inline void sev_enable(struct boot_params *bp)
+{
+	/*
+	 * bp->cc_blob_address should only be set by boot/compressed kernel.
+	 * Initialize it to 0 unconditionally (thus here in this stub too) to
+	 * ensure that uninitialized values from buggy bootloaders aren't
+	 * propagated.
+	 */
+	if (bp)
+		bp->cc_blob_address = 0;
+}
+static inline void snp_check_features(void) { }
+static inline void sev_es_shutdown_ghcb(void) { }
+static inline bool sev_es_check_ghcb_fault(unsigned long address)
+{
+	return false;
+}
+static inline void snp_set_page_private(unsigned long paddr) { }
+static inline void snp_set_page_shared(unsigned long paddr) { }
+static inline void sev_prep_identity_maps(unsigned long top_level_pgt) { }
+#endif
+
+/* acpi.c */
+#ifdef CONFIG_ACPI
+acpi_physical_address get_rsdp_addr(void);
+#else
+static inline acpi_physical_address get_rsdp_addr(void) { return 0; }
+#endif
+
+#if defined(CONFIG_RANDOMIZE_BASE) && defined(CONFIG_MEMORY_HOTREMOVE) && defined(CONFIG_ACPI)
+extern struct mem_vector immovable_mem[MAX_NUMNODES*2];
+int count_immovable_mem_regions(void);
+#else
+static inline int count_immovable_mem_regions(void) { return 0; }
+#endif
+
+/* ident_map_64.c */
+extern unsigned int __pgtable_l5_enabled, pgdir_shift, ptrs_per_p4d;
+extern void kernel_add_identity_map(unsigned long start, unsigned long end);
+
+/* Used by PAGE_KERN* macros: */
+extern pteval_t __default_kernel_pte_mask;
+
+/* idt_64.c */
+extern gate_desc boot_idt[BOOT_IDT_ENTRIES];
+extern struct desc_ptr boot_idt_desc;
+
+#ifdef CONFIG_X86_64
+void cleanup_exception_handling(void);
+#else
+static inline void cleanup_exception_handling(void) { }
+#endif
+
+/* IDT Entry Points */
+void boot_page_fault(void);
+void boot_stage1_vc(void);
+void boot_stage2_vc(void);
+
+unsigned long sev_verify_cbit(unsigned long cr3);
+
+enum efi_type {
+	EFI_TYPE_64,
+	EFI_TYPE_32,
+	EFI_TYPE_NONE,
+};
+
+#ifdef CONFIG_EFI
+/* helpers for early EFI config table access */
+enum efi_type efi_get_type(struct boot_params *bp);
+unsigned long efi_get_system_table(struct boot_params *bp);
+int efi_get_conf_table(struct boot_params *bp, unsigned long *cfg_tbl_pa,
+		       unsigned int *cfg_tbl_len);
+unsigned long efi_find_vendor_table(struct boot_params *bp,
+				    unsigned long cfg_tbl_pa,
+				    unsigned int cfg_tbl_len,
+				    efi_guid_t guid);
+#else
+static inline enum efi_type efi_get_type(struct boot_params *bp)
+{
+	return EFI_TYPE_NONE;
+}
+
+static inline unsigned long efi_get_system_table(struct boot_params *bp)
+{
+	return 0;
+}
+
+static inline int efi_get_conf_table(struct boot_params *bp,
+				     unsigned long *cfg_tbl_pa,
+				     unsigned int *cfg_tbl_len)
+{
+	return -ENOENT;
+}
+
+static inline unsigned long efi_find_vendor_table(struct boot_params *bp,
+						  unsigned long cfg_tbl_pa,
+						  unsigned int cfg_tbl_len,
+						  efi_guid_t guid)
+{
+	return 0;
+}
+#endif /* CONFIG_EFI */
+
+#ifdef CONFIG_UNACCEPTED_MEMORY
+bool init_unaccepted_memory(void);
+#else
+static inline bool init_unaccepted_memory(void) { return false; }
+#endif
+
+/* Defined in EFI stub */
+extern struct efi_unaccepted_memory *unaccepted_table;
+void accept_memory(phys_addr_t start, phys_addr_t end);
+
+#endif /* BOOT_COMPRESSED_MISC_H */