/arch/x86/include/asm/e820.h

  1#ifndef _ASM_X86_E820_H
  2#define _ASM_X86_E820_H
  3#define E820MAP	0x2d0		/* our map */
  4#define E820MAX	128		/* number of entries in E820MAP */
  5
  6/*
  7 * Legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the
  8 * constrained space in the zeropage.  If we have more nodes than
  9 * that, and if we've booted off EFI firmware, then the EFI tables
 10 * passed us from the EFI firmware can list more nodes.  Size our
 11 * internal memory map tables to have room for these additional
 12 * nodes, based on up to three entries per node for which the
 13 * kernel was built: MAX_NUMNODES == (1 << CONFIG_NODES_SHIFT),
 14 * plus E820MAX, allowing space for the possible duplicate E820
 15 * entries that might need room in the same arrays, prior to the
 16 * call to sanitize_e820_map() to remove duplicates.  The allowance
 17 * of three memory map entries per node is "enough" entries for
 18 * the initial hardware platform motivating this mechanism to make
 19 * use of additional EFI map entries.  Future platforms may want
 20 * to allow more than three entries per node or otherwise refine
 21 * this size.
 22 */
 23
 24/*
 25 * Odd: 'make headers_check' complains about numa.h if I try
 26 * to collapse the next two #ifdef lines to a single line:
 27 *	#if defined(__KERNEL__) && defined(CONFIG_EFI)
 28 */
 29#ifdef __KERNEL__
 30#ifdef CONFIG_EFI
 31#include <linux/numa.h>
 32#define E820_X_MAX (E820MAX + 3 * MAX_NUMNODES)
 33#else	/* ! CONFIG_EFI */
 34#define E820_X_MAX E820MAX
 35#endif
 36#else	/* ! __KERNEL__ */
 37#define E820_X_MAX E820MAX
 38#endif
 39
 40#define E820NR	0x1e8		/* # entries in E820MAP */
 41
 42#define E820_RAM	1
 43#define E820_RESERVED	2
 44#define E820_ACPI	3
 45#define E820_NVS	4
 46#define E820_UNUSABLE	5
 47
 48/*
 49 * reserved RAM used by kernel itself
 50 * if CONFIG_INTEL_TXT is enabled, memory of this type will be
 51 * included in the S3 integrity calculation and so should not include
 52 * any memory that BIOS might alter over the S3 transition
 53 */
 54#define E820_RESERVED_KERN        128
 55
 56#ifndef __ASSEMBLY__
 57#include <linux/types.h>
 58struct e820entry {
 59	__u64 addr;	/* start of memory segment */
 60	__u64 size;	/* size of memory segment */
 61	__u32 type;	/* type of memory segment */
 62} __attribute__((packed));
 63
 64struct e820map {
 65	__u32 nr_map;
 66	struct e820entry map[E820_X_MAX];
 67};
 68
 69#define ISA_START_ADDRESS	0xa0000
 70#define ISA_END_ADDRESS		0x100000
 71
 72#define BIOS_BEGIN		0x000a0000
 73#define BIOS_END		0x00100000
 74
 75#ifdef __KERNEL__
 76/* see comment in arch/x86/kernel/e820.c */
 77extern struct e820map e820;
 78extern struct e820map e820_saved;
 79
 80extern unsigned long pci_mem_start;
 81extern int e820_any_mapped(u64 start, u64 end, unsigned type);
 82extern int e820_all_mapped(u64 start, u64 end, unsigned type);
 83extern void e820_add_region(u64 start, u64 size, int type);
 84extern void e820_print_map(char *who);
 85extern int
 86sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, u32 *pnr_map);
 87extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
 88			       unsigned new_type);
 89extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type,
 90			     int checktype);
 91extern void update_e820(void);
 92extern void e820_setup_gap(void);
 93extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
 94			unsigned long start_addr, unsigned long long end_addr);
 95struct setup_data;
 96extern void parse_e820_ext(struct setup_data *data, unsigned long pa_data);
 97
 98#if defined(CONFIG_X86_64) || \
 99	(defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
100extern void e820_mark_nosave_regions(unsigned long limit_pfn);
101#else
102static inline void e820_mark_nosave_regions(unsigned long limit_pfn)
103{
104}
105#endif
106
107#ifdef CONFIG_MEMTEST
108extern void early_memtest(unsigned long start, unsigned long end);
109#else
110static inline void early_memtest(unsigned long start, unsigned long end)
111{
112}
113#endif
114
115extern unsigned long end_user_pfn;
116
117extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
118extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
119extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
120#include <linux/early_res.h>
121
122extern unsigned long e820_end_of_ram_pfn(void);
123extern unsigned long e820_end_of_low_ram_pfn(void);
124extern int e820_find_active_region(const struct e820entry *ei,
125				  unsigned long start_pfn,
126				  unsigned long last_pfn,
127				  unsigned long *ei_startpfn,
128				  unsigned long *ei_endpfn);
129extern void e820_register_active_regions(int nid, unsigned long start_pfn,
130					 unsigned long end_pfn);
131extern u64 e820_hole_size(u64 start, u64 end);
132extern void finish_e820_parsing(void);
133extern void e820_reserve_resources(void);
134extern void e820_reserve_resources_late(void);
135extern void setup_memory_map(void);
136extern char *default_machine_specific_memory_setup(void);
137
138/*
139 * Returns true iff the specified range [s,e) is completely contained inside
140 * the ISA region.
141 */
142static inline bool is_ISA_range(u64 s, u64 e)
143{
144	return s >= ISA_START_ADDRESS && e <= ISA_END_ADDRESS;
145}
146
147#endif /* __KERNEL__ */
148#endif /* __ASSEMBLY__ */
149
150#ifdef __KERNEL__
151#include <linux/ioport.h>
152
153#define HIGH_MEMORY	(1024*1024)
154#endif /* __KERNEL__ */
155
156#endif /* _ASM_X86_E820_H */