Commit 7410aa1c authored by Ingo Molnar's avatar Ingo Molnar
Browse files

x86/boot/e820: Separate the E820 ABI structures from the in-kernel structures 



Linus pointed out that relying on the compiler to pack structures with
enums is fragile not just for the kernel, but for external tooling as
well which might rely on our UAPI headers.

So separate the two from each other: introduce 'struct boot_e820_entry',
which is the boot protocol entry format.

This actually simplifies the code, as e820__update_table() is now never
called directly with boot protocol table entries - we can rely on
append_e820_table() and do a e820__update_table() call afterwards.

( This will allow further simplifications of __e820__update_table(),
  but that will be done in a separate patch. )

This change also has the side effect of not modifying the bootparams structure
anymore - which might be useful for debugging. In theory we could even constify
the boot_params structure - at least from the E820 code's point of view.

Remove the uapi/asm/e820/types.h file, as it's not used anymore - all
kernel side E820 types are defined in asm/e820/types.h.

Reported-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Cc: Alex Thorlton <athorlton@sgi.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Huang, Ying <ying.huang@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Paul Jackson <pj@sgi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent c5231a57

arch/x86/boot/compressed/eboot.c

+8 −8
Original line number Diff line number Diff line
@@ -900,7 +900,7 @@ static void add_e820ext(struct boot_params *params, 
	unsigned long size;



	e820ext->type = SETUP_E820_EXT;

	e820ext->len = nr_entries * sizeof(struct e820_entry);

	e820ext->len = nr_entries * sizeof(struct boot_e820_entry);

	e820ext->next = 0;



	data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
@@ -917,9 +917,9 @@ static void add_e820ext(struct boot_params *params, 
static efi_status_t setup_e820(struct boot_params *params,

			       struct setup_data *e820ext, u32 e820ext_size)

{

	struct e820_entry *e820_table = &params->e820_table[0];

	struct boot_e820_entry *entry = params->e820_table;

	struct efi_info *efi = &params->efi_info;

	struct e820_entry *prev = NULL;

	struct boot_e820_entry *prev = NULL;

	u32 nr_entries;

	u32 nr_desc;

	int i;
@@ -990,13 +990,13 @@ static efi_status_t setup_e820(struct boot_params *params, 
				return EFI_BUFFER_TOO_SMALL;



			/* boot_params map full, switch to e820 extended */

			e820_table = (struct e820_entry *)e820ext->data;

			entry = (struct boot_e820_entry *)e820ext->data;

		}



		e820_table->addr = d->phys_addr;

		e820_table->size = d->num_pages << PAGE_SHIFT;

		e820_table->type = e820_type;

		prev = e820_table++;

		entry->addr = d->phys_addr;

		entry->size = d->num_pages << PAGE_SHIFT;

		entry->type = e820_type;

		prev = entry++;

		nr_entries++;

	}

arch/x86/boot/compressed/kaslr.c

+1 −1
Original line number Diff line number Diff line
@@ -426,7 +426,7 @@ static unsigned long slots_fetch_random(void) 
	return 0;

}



static void process_e820_entry(struct e820_entry *entry,

static void process_e820_entry(struct boot_e820_entry *entry,

			       unsigned long minimum,

			       unsigned long image_size)

{

arch/x86/boot/memory.c

+2 −2
Original line number Diff line number Diff line
@@ -21,8 +21,8 @@ static int detect_memory_e820(void) 
{

	int count = 0;

	struct biosregs ireg, oreg;

	struct e820_entry *desc = boot_params.e820_table;

	static struct e820_entry buf; /* static so it is zeroed */

	struct boot_e820_entry *desc = boot_params.e820_table;

	static struct boot_e820_entry buf; /* static so it is zeroed */



	initregs(&ireg);

	ireg.ax  = 0xe820;

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

+47 −1
Original line number Diff line number Diff line 
#ifndef _ASM_E820_TYPES_H

#define _ASM_E820_TYPES_H



#include <uapi/asm/e820/types.h>

#include <uapi/asm/bootparam.h>



/*

 * These are the E820 types known to the kernel:

 */

enum e820_type {

	E820_TYPE_RAM		= 1,

	E820_TYPE_RESERVED	= 2,

	E820_TYPE_ACPI		= 3,

	E820_TYPE_NVS		= 4,

	E820_TYPE_UNUSABLE	= 5,

	E820_TYPE_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=y 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... )

	 */

	E820_TYPE_PRAM		= 12,



	/*

	 * Reserved RAM used by the kernel itself if

	 * CONFIG_INTEL_TXT=y is enabled, memory of this type

	 * will be included in the S3 integrity calculation

	 * and so should not include any memory that the BIOS

	 * might alter over the S3 transition:

	 */

	E820_TYPE_RESERVED_KERN	= 128,

};



/*

 * A single E820 map entry, describing a memory range of [addr...addr+size-1],

 * of 'type' memory type:

 *

 * (We pack it because there can be thousands of them on large systems.)

 */

struct e820_entry {

	u64			addr;

	u64			size;

	enum e820_type		type;

} __attribute__((packed));



/*

 * The legacy E820 BIOS limits us to 128 (E820_MAX_ENTRIES_ZEROPAGE) nodes

arch/x86/include/uapi/asm/bootparam.h

+16 −2
Original line number Diff line number Diff line
@@ -34,7 +34,6 @@ 
#include <linux/screen_info.h>

#include <linux/apm_bios.h>

#include <linux/edd.h>

#include <uapi/asm/e820/types.h>

#include <asm/ist.h>

#include <video/edid.h>
@@ -111,6 +110,21 @@ struct efi_info { 
	__u32 efi_memmap_hi;

};



/*

 * This is the maximum number of entries in struct boot_params::e820_table

 * (the zeropage), which is part of the x86 boot protocol ABI:

 */

#define E820_MAX_ENTRIES_ZEROPAGE 128



/*

 * The E820 memory region entry of the boot protocol ABI:

 */

struct boot_e820_entry {

	__u64 addr;

	__u64 size;

	__u32 type;

} __attribute__((packed));



/* The so-called "zeropage" */

struct boot_params {

	struct screen_info screen_info;			/* 0x000 */
@@ -152,7 +166,7 @@ struct boot_params { 
	struct setup_header hdr;    /* setup header */	/* 0x1f1 */

	__u8  _pad7[0x290-0x1f1-sizeof(struct setup_header)];

	__u32 edd_mbr_sig_buffer[EDD_MBR_SIG_MAX];	/* 0x290 */

	struct e820_entry e820_table[E820_MAX_ENTRIES_ZEROPAGE]; /* 0x2d0 */

	struct boot_e820_entry e820_table[E820_MAX_ENTRIES_ZEROPAGE]; /* 0x2d0 */

	__u8  _pad8[48];				/* 0xcd0 */

	struct edd_info eddbuf[EDDMAXNR];		/* 0xd00 */

	__u8  _pad9[276];				/* 0xeec */

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