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 36 37 /* 38 * reserved RAM used by kernel itself 39 * if CONFIG_INTEL_TXT is enabled, memory of this type will be 40 * included in the S3 integrity calculation and so should not include 41 * any memory that BIOS might alter over the S3 transition 42 */ 43 #define E820_RESERVED_KERN 128 44 45 #ifndef __ASSEMBLY__ 46 #include <linux/types.h> 47 struct e820entry { 48 __u64 addr; /* start of memory segment */ 49 __u64 size; /* size of memory segment */ 50 __u32 type; /* type of memory segment */ 51 } __attribute__((packed)); 52 53 struct e820map { 54 __u32 nr_map; 55 struct e820entry map[E820_X_MAX]; 56 }; 57 58 #define ISA_START_ADDRESS 0xa0000 59 #define ISA_END_ADDRESS 0x100000 60 61 #define BIOS_BEGIN 0x000a0000 62 #define BIOS_END 0x00100000 63 64 #define BIOS_ROM_BASE 0xffe00000 65 #define BIOS_ROM_END 0xffffffff 66 67 #endif /* __ASSEMBLY__ */ 68 69 70 #endif /* _UAPI_ASM_X86_E820_H */ 71