mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-20 10:44:23 +08:00
7a67832c7e
We currently register a platform device for e820 type-12 memory and register a nvdimm bus beneath it. Registering the platform device triggers the device-core machinery to probe for a driver, but that search currently comes up empty. Building the nvdimm-bus registration into the e820_pmem platform device registration in this way forces libnvdimm to be built-in. Instead, convert the built-in portion of CONFIG_X86_PMEM_LEGACY to simply register a platform device and move the rest of the logic to the driver for e820_pmem, for the following reasons: 1/ Letting e820_pmem support be a module allows building and testing libnvdimm.ko changes without rebooting 2/ All the normal policy around modules can be applied to e820_pmem (unbind to disable and/or blacklisting the module from loading by default) 3/ Moving the driver to a generic location and converting it to scan "iomem_resource" rather than "e820.map" means any other architecture can take advantage of this simple nvdimm resource discovery mechanism by registering a resource named "Persistent Memory (legacy)" Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
#ifndef _UAPI_ASM_X86_E820_H
|
|
#define _UAPI_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.
|
|
*/
|
|
|
|
#ifndef __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
|
|
#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 /* _UAPI_ASM_X86_E820_H */
|