41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
|
/*
|
||
|
|
* 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*/
|