e820.h

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#ifndef _ASM_X86_E820_H
#define _ASM_X86_E820_H
#define E820MAP 0x2d0       /* our map */
#define E820MAX 128     /* number of entries in E820MAP */

/*
 * Legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the
 * constrained space in the zeropage.  If we have more nodes than
 * that, and if we've booted off EFI firmware, then the EFI tables
 * passed us from the EFI firmware can list more nodes.  Size our
 * internal memory map tables to have room for these additional
 * nodes, based on up to three entries per node for which the
 * kernel was built: MAX_NUMNODES == (1 << CONFIG_NODES_SHIFT),
 * plus E820MAX, allowing space for the possible duplicate E820
 * entries that might need room in the same arrays, prior to the
 * call to sanitize_e820_map() to remove duplicates.  The allowance
 * of three memory map entries per node is "enough" entries for
 * the initial hardware platform motivating this mechanism to make
 * use of additional EFI map entries.  Future platforms may want
 * to allow more than three entries per node or otherwise refine
 * this size.
 */

/*
 * Odd: 'make headers_check' complains about numa.h if I try
 * to collapse the next two #ifdef lines to a single line:
 *  #if defined(__KERNEL__) && defined(CONFIG_EFI)
 */
#ifdef __KERNEL__
#ifdef CONFIG_EFI
#include <linux/numa.h>
#define E820_X_MAX (E820MAX + 3 * MAX_NUMNODES)
#else   /* ! CONFIG_EFI */
#define E820_X_MAX E820MAX
#endif
#else   /* ! __KERNEL__ */
#define E820_X_MAX E820MAX
#endif

#define E820NR  0x1e8       /* # entries in E820MAP */

#define E820_RAM    1
#define E820_RESERVED   2
#define E820_ACPI   3
#define E820_NVS    4
#define E820_UNUSABLE   5

/*
 * reserved RAM used by kernel itself
 * if CONFIG_INTEL_TXT is enabled, memory of this type will be
 * included in the S3 integrity calculation and so should not include
 * any memory that BIOS might alter over the S3 transition
 */
#define E820_RESERVED_KERN        128

#ifndef __ASSEMBLY__
#include <linux/types.h>
struct e820entry {
    __u64 addr; /* start of memory segment */
    __u64 size; /* size of memory segment */
    __u32 type; /* type of memory segment */
} __attribute__((packed));

struct e820map {
    __u32 nr_map;
    struct e820entry map[E820_X_MAX];
};

#define ISA_START_ADDRESS   0xa0000
#define ISA_END_ADDRESS     0x100000

#define BIOS_BEGIN      0x000a0000
#define BIOS_END        0x00100000

#define BIOS_ROM_BASE       0xffe00000
#define BIOS_ROM_END        0xffffffff

#ifdef __KERNEL__
/* see comment in arch/x86/kernel/e820.c */
extern struct e820map e820;
extern struct e820map e820_saved;

extern unsigned long pci_mem_start;
extern int e820_any_mapped(u64 start, u64 end, unsigned type);
extern int e820_all_mapped(u64 start, u64 end, unsigned type);
extern void e820_add_region(u64 start, u64 size, int type);
extern void e820_print_map(char *who);
extern int
sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, u32 *pnr_map);
extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
                   unsigned new_type);
extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type,
                 int checktype);
extern void update_e820(void);
extern void e820_setup_gap(void);
extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
            unsigned long start_addr, unsigned long long end_addr);
struct setup_data;
extern void parse_e820_ext(struct setup_data *data);

#if defined(CONFIG_X86_64) || \
    (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
extern void e820_mark_nosave_regions(unsigned long limit_pfn);
#else
static inline void e820_mark_nosave_regions(unsigned long limit_pfn)
{
}
#endif

#ifdef CONFIG_MEMTEST
extern void early_memtest(unsigned long start, unsigned long end);
#else
static inline void early_memtest(unsigned long start, unsigned long end)
{
}
#endif

extern unsigned long e820_end_of_ram_pfn(void);
extern unsigned long e820_end_of_low_ram_pfn(void);
extern u64 early_reserve_e820(u64 sizet, u64 align);

void memblock_x86_fill(void);
void memblock_find_dma_reserve(void);

extern void finish_e820_parsing(void);
extern void e820_reserve_resources(void);
extern void e820_reserve_resources_late(void);
extern void setup_memory_map(void);
extern char *default_machine_specific_memory_setup(void);

/*
 * Returns true iff the specified range [s,e) is completely contained inside
 * the ISA region.
 */
static inline bool is_ISA_range(u64 s, u64 e)
{
    return s >= ISA_START_ADDRESS && e <= ISA_END_ADDRESS;
}

#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */

#ifdef __KERNEL__
#include <linux/ioport.h>

#define HIGH_MEMORY (1024*1024)
#endif /* __KERNEL__ */

#endif /* _ASM_X86_E820_H */