tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * structures and definitions for the int 15, ax=e820 memory map
3 * scheme.
4 *
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.
10 *
11 */
12#ifndef __E820_HEADER
13#define __E820_HEADER
14
15#define E820MAP 0x2d0 /* our map */
16#define E820MAX 128 /* number of entries in E820MAP */
17#define E820NR 0x1e8 /* # entries in E820MAP */
18
19#define E820_RAM 1
20#define E820_RESERVED 2
21#define E820_ACPI 3
22#define E820_NVS 4
23
24#define HIGH_MEMORY (1024*1024)
25
26#ifndef __ASSEMBLY__
27
28struct e820map {
29 int nr_map;
30 struct e820entry {
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 */
34 } map[E820MAX];
35};
36
37extern struct e820map e820;
38
39extern int e820_all_mapped(unsigned long start, unsigned long end,
40 unsigned type);
41extern void find_max_pfn(void);
42extern void register_bootmem_low_pages(unsigned long max_low_pfn);
43extern void e820_register_memory(void);
44extern void limit_regions(unsigned long long size);
45extern void print_memory_map(char *who);
46
47#endif/*!__ASSEMBLY__*/
48
49#endif/*__E820_HEADER*/