[bios] Add bin-x86_64-pcbios build platform

Move most arch/i386 files to arch/x86, and adjust the contents of the
Makefiles and the include/bits/*.h headers to reflect the new
locations.

This patch makes no substantive code changes, as can be seen using a
rename-aware diff (e.g. "git show -M5").

This patch does not make the pcbios platform functional for x86_64; it
merely allows it to compile without errors.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/x86/include/multiboot.h

@@ -0,0 +1,149 @@
+#ifndef _MULTIBOOT_H
+#define _MULTIBOOT_H
+
+/**
+ * @file
+ *
+ * Multiboot operating systems
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <stdint.h>
+
+/** The magic number for the Multiboot header */
+#define MULTIBOOT_HEADER_MAGIC 0x1BADB002
+
+/** Boot modules must be page aligned */
+#define MB_FLAG_PGALIGN 0x00000001
+
+/** Memory map must be provided */
+#define MB_FLAG_MEMMAP 0x00000002
+
+/** Video mode information must be provided */
+#define MB_FLAG_VIDMODE 0x00000004
+
+/** Image is a raw multiboot image (not ELF) */
+#define MB_FLAG_RAW 0x00010000
+
+/**
+ * The magic number passed by a Multiboot-compliant boot loader
+ *
+ * Must be passed in register %eax when jumping to the Multiboot OS
+ * image.
+ */
+#define MULTIBOOT_BOOTLOADER_MAGIC 0x2BADB002
+
+/** Multiboot information structure mem_* fields are valid */
+#define MBI_FLAG_MEM 0x00000001
+
+/** Multiboot information structure boot_device field is valid */
+#define MBI_FLAG_BOOTDEV 0x00000002
+
+/** Multiboot information structure cmdline field is valid */
+#define MBI_FLAG_CMDLINE 0x00000004
+
+/** Multiboot information structure module fields are valid */
+#define MBI_FLAG_MODS 0x00000008
+
+/** Multiboot information structure a.out symbol table is valid */
+#define MBI_FLAG_AOUT 0x00000010
+
+/** Multiboot information struture ELF section header table is valid */
+#define MBI_FLAG_ELF 0x00000020
+
+/** Multiboot information structure memory map is valid */
+#define MBI_FLAG_MMAP 0x00000040
+
+/** Multiboot information structure drive list is valid */
+#define MBI_FLAG_DRIVES 0x00000080
+
+/** Multiboot information structure ROM configuration field is valid */
+#define MBI_FLAG_CFGTBL 0x00000100
+
+/** Multiboot information structure boot loader name field is valid */
+#define MBI_FLAG_LOADER 0x00000200
+
+/** Multiboot information structure APM table is valid */
+#define MBI_FLAG_APM 0x00000400
+
+/** Multiboot information structure video information is valid */
+#define MBI_FLAG_VBE 0x00000800
+
+/** A multiboot header */
+struct multiboot_header {
+	uint32_t magic;
+	uint32_t flags;
+	uint32_t checksum;
+	uint32_t header_addr;
+	uint32_t load_addr;
+	uint32_t load_end_addr;
+	uint32_t bss_end_addr;
+	uint32_t entry_addr;
+} __attribute__ (( packed, may_alias ));
+
+/** A multiboot a.out symbol table */
+struct multiboot_aout_symbol_table {
+	uint32_t tabsize;
+	uint32_t strsize;
+	uint32_t addr;
+	uint32_t reserved;
+} __attribute__ (( packed, may_alias ));
+
+/** A multiboot ELF section header table */
+struct multiboot_elf_section_header_table {
+	uint32_t num;
+	uint32_t size;
+	uint32_t addr;
+	uint32_t shndx;
+} __attribute__ (( packed, may_alias ));
+
+/** A multiboot information structure */
+struct multiboot_info {
+	uint32_t flags;
+	uint32_t mem_lower;
+	uint32_t mem_upper;
+	uint32_t boot_device;
+	uint32_t cmdline;
+	uint32_t mods_count;
+	uint32_t mods_addr;
+	union {
+		struct multiboot_aout_symbol_table aout_syms;
+		struct multiboot_elf_section_header_table elf_sections;
+	} syms;
+	uint32_t mmap_length;
+	uint32_t mmap_addr;
+	uint32_t drives_length;
+	uint32_t drives_addr;
+	uint32_t config_table;
+	uint32_t boot_loader_name;
+	uint32_t apm_table;
+	uint32_t vbe_control_info;
+	uint32_t vbe_mode_info;
+	uint16_t vbe_mode;
+	uint16_t vbe_interface_seg;
+	uint16_t vbe_interface_off;
+	uint16_t vbe_interface_len;
+} __attribute__ (( packed, may_alias ));
+
+/** A multiboot module structure */
+struct multiboot_module {
+	uint32_t mod_start;
+	uint32_t mod_end;
+	uint32_t string;
+	uint32_t reserved;
+} __attribute__ (( packed, may_alias ));
+
+/** A multiboot memory map entry */
+struct multiboot_memory_map {
+	uint32_t size;
+	uint64_t base_addr;
+	uint64_t length;
+	uint32_t type;
+} __attribute__ (( packed, may_alias ));
+
+/** Usable RAM */
+#define MBMEM_RAM 1
+
+#endif /* _MULTIBOOT_H */