1 #ifndef _UAPI_ASM_X86_E820_H 2 #define _UAPI_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 #ifndef __KERNEL__ 25 #define E820_X_MAX E820MAX 26 #endif 27 28 #define E820NR 0x1e8 /* # entries in E820MAP */ 29 30 #define E820_RAM 1 31 #define E820_RESERVED 2 32 #define E820_ACPI 3 33 #define E820_NVS 4 34 #define E820_UNUSABLE 5 35 #define E820_PMEM 7 36 37 /* 38 * This is a non-standardized way to represent ADR or NVDIMM regions that 39 * persist over a reboot. The kernel will ignore their special capabilities 40 * unless the CONFIG_X86_PMEM_LEGACY option is set. 41 * 42 * ( Note that older platforms also used 6 for the same type of memory, 43 * but newer versions switched to 12 as 6 was assigned differently. Some 44 * time they will learn... ) 45 */ 46 #define E820_PRAM 12 47 48 /* 49 * reserved RAM used by kernel itself 50 * if CONFIG_INTEL_TXT is enabled, memory of this type will be 51 * included in the S3 integrity calculation and so should not include 52 * any memory that BIOS might alter over the S3 transition 53 */ 54 #define E820_RESERVED_KERN 128 55 56 #ifndef __ASSEMBLY__ 57 #include <linux/types.h> 58 struct e820entry { 59 __u64 addr; /* start of memory segment */ 60 __u64 size; /* size of memory segment */ 61 __u32 type; /* type of memory segment */ 62 } __attribute__((packed)); 63 64 struct e820map { 65 __u32 nr_map; 66 struct e820entry map[E820_X_MAX]; 67 }; 68 69 #define ISA_START_ADDRESS 0xa0000 70 #define ISA_END_ADDRESS 0x100000 71 72 #define BIOS_BEGIN 0x000a0000 73 #define BIOS_END 0x00100000 74 75 #define BIOS_ROM_BASE 0xffe00000 76 #define BIOS_ROM_END 0xffffffff 77 78 #endif /* __ASSEMBLY__ */ 79 80 81 #endif /* _UAPI_ASM_X86_E820_H */ 82