1 #ifndef _ASM_X86_E820_H 2 #define _ASM_X86_E820_H 3 #define E820MAP 0x2d0 /* our map */ 4 #define E820MAX 128 /* number of entries in E820MAP */ 5 6 /* 7 * Legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the 8 * constrained space in the zeropage. If we have more nodes than 9 * that, and if we've booted off EFI firmware, then the EFI tables 10 * passed us from the EFI firmware can list more nodes. Size our 11 * internal memory map tables to have room for these additional 12 * nodes, based on up to three entries per node for which the 13 * kernel was built: MAX_NUMNODES == (1 << CONFIG_NODES_SHIFT), 14 * plus E820MAX, allowing space for the possible duplicate E820 15 * entries that might need room in the same arrays, prior to the 16 * call to sanitize_e820_map() to remove duplicates. The allowance 17 * of three memory map entries per node is "enough" entries for 18 * the initial hardware platform motivating this mechanism to make 19 * use of additional EFI map entries. Future platforms may want 20 * to allow more than three entries per node or otherwise refine 21 * this size. 22 */ 23 24 /* 25 * Odd: 'make headers_check' complains about numa.h if I try 26 * to collapse the next two #ifdef lines to a single line: 27 * #if defined(__KERNEL__) && defined(CONFIG_EFI) 28 */ 29 #define E820_X_MAX E820MAX 30 31 #define E820NR 0x1e8 /* # entries in E820MAP */ 32 33 #define E820_RAM 1 34 #define E820_RESERVED 2 35 #define E820_ACPI 3 36 #define E820_NVS 4 37 #define E820_UNUSABLE 5 38 39 40 /* 41 * reserved RAM used by kernel itself 42 * if CONFIG_INTEL_TXT is enabled, memory of this type will be 43 * included in the S3 integrity calculation and so should not include 44 * any memory that BIOS might alter over the S3 transition 45 */ 46 #define E820_RESERVED_KERN 128 47 48 #ifndef __ASSEMBLY__ 49 #include <linux/types.h> 50 struct e820entry { 51 __u64 addr; /* start of memory segment */ 52 __u64 size; /* size of memory segment */ 53 __u32 type; /* type of memory segment */ 54 } __attribute__((packed)); 55 56 struct e820map { 57 __u32 nr_map; 58 struct e820entry map[E820_X_MAX]; 59 }; 60 61 #define ISA_START_ADDRESS 0xa0000 62 #define ISA_END_ADDRESS 0x100000 63 64 #define BIOS_BEGIN 0x000a0000 65 #define BIOS_END 0x00100000 66 67 #define BIOS_ROM_BASE 0xffe00000 68 #define BIOS_ROM_END 0xffffffff 69 70 #endif /* __ASSEMBLY__ */ 71 72 73 #endif /* _ASM_X86_E820_H */ 74