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Edit File : e820.h \| Size : 2.52 KB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / #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. / #define E820_X_MAX E820MAX #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 #define E820_PMEM 7 / * This is a non-standardized way to represent ADR or NVDIMM regions that * persist over a reboot. The kernel will ignore their special capabilities * unless the CONFIG_X86_PMEM_LEGACY option is set. * * ( Note that older platforms also used 6 for the same type of memory, * but newer versions switched to 12 as 6 was assigned differently. Some * time they will learn... ) / #define E820_PRAM 12 / * 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 #endif / __ASSEMBLY__ / #endif / _ASM_X86_E820_H */ Back

Edit File : e820.h | Size : 2.52 KB

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#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.
 */

#define E820_X_MAX E820MAX

#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
#define E820_PMEM	7

/*
 * This is a non-standardized way to represent ADR or NVDIMM regions that
 * persist over a reboot.  The kernel will ignore their special capabilities
 * unless the CONFIG_X86_PMEM_LEGACY option is set.
 *
 * ( Note that older platforms also used 6 for the same type of memory,
 *   but newer versions switched to 12 as 6 was assigned differently.  Some
 *   time they will learn... )
 */
#define E820_PRAM	12

/*
 * 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

#endif /* __ASSEMBLY__ */

#endif /* _ASM_X86_E820_H */

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