| #ifndef _ASM_X86_E820_H |
| #define _ASM_X86_E820_H |
| #define E820MAP 0x2d0 /* our map */ |
| #define E820MAX 128 /* number of entries in E820MAP */ |
| |
| /* |
| * Legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the |
| * constrained space in the zeropage. If we have more nodes than |
| * that, and if we've booted off EFI firmware, then the EFI tables |
| * passed us from the EFI firmware can list more nodes. Size our |
| * internal memory map tables to have room for these additional |
| * nodes, based on up to three entries per node for which the |
| * kernel was built: MAX_NUMNODES == (1 << CONFIG_NODES_SHIFT), |
| * plus E820MAX, allowing space for the possible duplicate E820 |
| * entries that might need room in the same arrays, prior to the |
| * call to sanitize_e820_map() to remove duplicates. The allowance |
| * of three memory map entries per node is "enough" entries for |
| * the initial hardware platform motivating this mechanism to make |
| * use of additional EFI map entries. Future platforms may want |
| * to allow more than three entries per node or otherwise refine |
| * this size. |
| */ |
| |
| /* |
| * Odd: 'make headers_check' complains about numa.h if I try |
| * to collapse the next two #ifdef lines to a single line: |
| * #if defined(__KERNEL__) && defined(CONFIG_EFI) |
| */ |
| #define E820_X_MAX E820MAX |
| |
| #define E820NR 0x1e8 /* # entries in E820MAP */ |
| |
| #define E820_RAM 1 |
| #define E820_RESERVED 2 |
| #define E820_ACPI 3 |
| #define E820_NVS 4 |
| #define E820_UNUSABLE 5 |
| |
| /* |
| * reserved RAM used by kernel itself |
| * if CONFIG_INTEL_TXT is enabled, memory of this type will be |
| * included in the S3 integrity calculation and so should not include |
| * any memory that BIOS might alter over the S3 transition |
| */ |
| #define E820_RESERVED_KERN 128 |
| |
| #ifndef __ASSEMBLY__ |
| #include <linux/types.h> |
| struct e820entry { |
| __u64 addr; /* start of memory segment */ |
| __u64 size; /* size of memory segment */ |
| __u32 type; /* type of memory segment */ |
| } __attribute__((packed)); |
| |
| struct e820map { |
| __u32 nr_map; |
| struct e820entry map[E820_X_MAX]; |
| }; |
| |
| #define ISA_START_ADDRESS 0xa0000 |
| #define ISA_END_ADDRESS 0x100000 |
| |
| #define BIOS_BEGIN 0x000a0000 |
| #define BIOS_END 0x00100000 |
| |
| #define BIOS_ROM_BASE 0xffe00000 |
| #define BIOS_ROM_END 0xffffffff |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| |
| #endif /* _ASM_X86_E820_H */ |
