2 * structures and definitions for the int 15, ax=e820 memory map
5 * In a nutshell, arch/i386/boot/setup.S populates a scratch table
6 * in the empty_zero_block that contains a list of usable address/size
7 * duples. In arch/i386/kernel/setup.c, this information is
8 * transferred into the e820map, and in arch/i386/mm/init.c, that
9 * new information is used to mark pages reserved or not.
15 #define E820MAP 0x2d0 /* our map */
16 #define E820MAX 128 /* number of entries in E820MAP */
17 #define E820NR 0x1e8 /* # entries in E820MAP */
20 #define E820_RESERVED 2
21 #define E820_ACPI 3 /* usable as RAM once ACPI tables have been read */
24 #define HIGH_MEMORY (1024*1024)
31 unsigned long long addr; /* start of memory segment */
32 unsigned long long size; /* size of memory segment */
33 unsigned long type; /* type of memory segment */
37 extern struct e820map e820;
39 extern int e820_all_mapped(unsigned long start, unsigned long end,
42 #endif/*!__ASSEMBLY__*/
44 #endif/*__E820_HEADER*/