linux-stable/arch/arm64/kernel/vmlinux.lds.S
James Morse 82869ac57b arm64: kernel: Add support for hibernate/suspend-to-disk
Add support for hibernate/suspend-to-disk.

Suspend borrows code from cpu_suspend() to write cpu state onto the stack,
before calling swsusp_save() to save the memory image.

Restore creates a set of temporary page tables, covering only the
linear map, copies the restore code to a 'safe' page, then uses the copy to
restore the memory image. The copied code executes in the lower half of the
address space, and once complete, restores the original kernel's page
tables. It then calls into cpu_resume(), and follows the normal
cpu_suspend() path back into the suspend code.

To restore a kernel using KASLR, the address of the page tables, and
cpu_resume() are stored in the hibernate arch-header and the el2
vectors are pivotted via the 'safe' page in low memory.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Kevin Hilman <khilman@baylibre.com> # Tested on Juno R2
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-04-28 13:36:22 +01:00

228 lines
5.2 KiB
ArmAsm

/*
* ld script to make ARM Linux kernel
* taken from the i386 version by Russell King
* Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
*/
#include <asm-generic/vmlinux.lds.h>
#include <asm/cache.h>
#include <asm/kernel-pgtable.h>
#include <asm/thread_info.h>
#include <asm/memory.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include "image.h"
/* .exit.text needed in case of alternative patching */
#define ARM_EXIT_KEEP(x) x
#define ARM_EXIT_DISCARD(x)
OUTPUT_ARCH(aarch64)
ENTRY(_text)
jiffies = jiffies_64;
#define HYPERVISOR_TEXT \
/* \
* Align to 4 KB so that \
* a) the HYP vector table is at its minimum \
* alignment of 2048 bytes \
* b) the HYP init code will not cross a page \
* boundary if its size does not exceed \
* 4 KB (see related ASSERT() below) \
*/ \
. = ALIGN(SZ_4K); \
VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \
*(.hyp.idmap.text) \
VMLINUX_SYMBOL(__hyp_idmap_text_end) = .; \
VMLINUX_SYMBOL(__hyp_text_start) = .; \
*(.hyp.text) \
VMLINUX_SYMBOL(__hyp_text_end) = .;
#define IDMAP_TEXT \
. = ALIGN(SZ_4K); \
VMLINUX_SYMBOL(__idmap_text_start) = .; \
*(.idmap.text) \
VMLINUX_SYMBOL(__idmap_text_end) = .;
#ifdef CONFIG_HIBERNATION
#define HIBERNATE_TEXT \
. = ALIGN(SZ_4K); \
VMLINUX_SYMBOL(__hibernate_exit_text_start) = .;\
*(.hibernate_exit.text) \
VMLINUX_SYMBOL(__hibernate_exit_text_end) = .;
#else
#define HIBERNATE_TEXT
#endif
/*
* The size of the PE/COFF section that covers the kernel image, which
* runs from stext to _edata, must be a round multiple of the PE/COFF
* FileAlignment, which we set to its minimum value of 0x200. 'stext'
* itself is 4 KB aligned, so padding out _edata to a 0x200 aligned
* boundary should be sufficient.
*/
PECOFF_FILE_ALIGNMENT = 0x200;
#ifdef CONFIG_EFI
#define PECOFF_EDATA_PADDING \
.pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); }
#else
#define PECOFF_EDATA_PADDING
#endif
#if defined(CONFIG_DEBUG_ALIGN_RODATA)
/*
* 4 KB granule: 1 level 2 entry
* 16 KB granule: 128 level 3 entries, with contiguous bit
* 64 KB granule: 32 level 3 entries, with contiguous bit
*/
#define SEGMENT_ALIGN SZ_2M
#else
/*
* 4 KB granule: 16 level 3 entries, with contiguous bit
* 16 KB granule: 4 level 3 entries, without contiguous bit
* 64 KB granule: 1 level 3 entry
*/
#define SEGMENT_ALIGN SZ_64K
#endif
SECTIONS
{
/*
* XXX: The linker does not define how output sections are
* assigned to input sections when there are multiple statements
* matching the same input section name. There is no documented
* order of matching.
*/
/DISCARD/ : {
ARM_EXIT_DISCARD(EXIT_TEXT)
ARM_EXIT_DISCARD(EXIT_DATA)
EXIT_CALL
*(.discard)
*(.discard.*)
*(.interp .dynamic)
}
. = KIMAGE_VADDR + TEXT_OFFSET;
.head.text : {
_text = .;
HEAD_TEXT
}
.text : { /* Real text segment */
_stext = .; /* Text and read-only data */
__exception_text_start = .;
*(.exception.text)
__exception_text_end = .;
IRQENTRY_TEXT
SOFTIRQENTRY_TEXT
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
HYPERVISOR_TEXT
IDMAP_TEXT
HIBERNATE_TEXT
*(.fixup)
*(.gnu.warning)
. = ALIGN(16);
*(.got) /* Global offset table */
}
. = ALIGN(SEGMENT_ALIGN);
RO_DATA(PAGE_SIZE) /* everything from this point to */
EXCEPTION_TABLE(8) /* _etext will be marked RO NX */
NOTES
. = ALIGN(SEGMENT_ALIGN);
_etext = .; /* End of text and rodata section */
__init_begin = .;
INIT_TEXT_SECTION(8)
.exit.text : {
ARM_EXIT_KEEP(EXIT_TEXT)
}
.init.data : {
INIT_DATA
INIT_SETUP(16)
INIT_CALLS
CON_INITCALL
SECURITY_INITCALL
INIT_RAM_FS
*(.init.rodata.* .init.bss) /* from the EFI stub */
}
.exit.data : {
ARM_EXIT_KEEP(EXIT_DATA)
}
PERCPU_SECTION(L1_CACHE_BYTES)
. = ALIGN(4);
.altinstructions : {
__alt_instructions = .;
*(.altinstructions)
__alt_instructions_end = .;
}
.altinstr_replacement : {
*(.altinstr_replacement)
}
.rela : ALIGN(8) {
*(.rela .rela*)
}
.dynsym : ALIGN(8) {
*(.dynsym)
}
.dynstr : {
*(.dynstr)
}
.hash : {
*(.hash)
}
__rela_offset = ADDR(.rela) - KIMAGE_VADDR;
__rela_size = SIZEOF(.rela);
__dynsym_offset = ADDR(.dynsym) - KIMAGE_VADDR;
. = ALIGN(SEGMENT_ALIGN);
__init_end = .;
_data = .;
_sdata = .;
RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
PECOFF_EDATA_PADDING
_edata = .;
BSS_SECTION(0, 0, 0)
. = ALIGN(PAGE_SIZE);
idmap_pg_dir = .;
. += IDMAP_DIR_SIZE;
swapper_pg_dir = .;
. += SWAPPER_DIR_SIZE;
_end = .;
STABS_DEBUG
HEAD_SYMBOLS
}
/*
* The HYP init code and ID map text can't be longer than a page each,
* and should not cross a page boundary.
*/
ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
"HYP init code too big or misaligned")
ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
"ID map text too big or misaligned")
#ifdef CONFIG_HIBERNATION
ASSERT(__hibernate_exit_text_end - (__hibernate_exit_text_start & ~(SZ_4K - 1))
<= SZ_4K, "Hibernate exit text too big or misaligned")
#endif
/*
* If padding is applied before .head.text, virt<->phys conversions will fail.
*/
ASSERT(_text == (KIMAGE_VADDR + TEXT_OFFSET), "HEAD is misaligned")