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Diffstat (limited to 'include/asm-i386/e820.h')
| -rw-r--r-- | include/asm-i386/e820.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/include/asm-i386/e820.h b/include/asm-i386/e820.h new file mode 100644 index 000000000000..5c285aee7294 --- /dev/null +++ b/include/asm-i386/e820.h @@ -0,0 +1,40 @@ +/* + * structures and definitions for the int 15, ax=e820 memory map + * scheme. + * + * In a nutshell, arch/i386/boot/setup.S populates a scratch table + * in the empty_zero_block that contains a list of usable address/size + * duples. In arch/i386/kernel/setup.c, this information is + * transferred into the e820map, and in arch/i386/mm/init.c, that + * new information is used to mark pages reserved or not. + * + */ +#ifndef __E820_HEADER +#define __E820_HEADER + +#define E820MAP 0x2d0 /* our map */ +#define E820MAX 32 /* number of entries in E820MAP */ +#define E820NR 0x1e8 /* # entries in E820MAP */ + +#define E820_RAM 1 +#define E820_RESERVED 2 +#define E820_ACPI 3 /* usable as RAM once ACPI tables have been read */ +#define E820_NVS 4 + +#define HIGH_MEMORY (1024*1024) + +#ifndef __ASSEMBLY__ + +struct e820map { + int nr_map; + struct e820entry { + unsigned long long addr; /* start of memory segment */ + unsigned long long size; /* size of memory segment */ + unsigned long type; /* type of memory segment */ + } map[E820MAX]; +}; + +extern struct e820map e820; +#endif/*!__ASSEMBLY__*/ + +#endif/*__E820_HEADER*/ |