linux/arch/riscv/kernel/vmlinux-xip.lds.S
Vitaly Wool 44c9225729
RISC-V: enable XIP
Introduce XIP (eXecute In Place) support for RISC-V platforms.
It allows code to be executed directly from non-volatile storage
directly addressable by the CPU, such as QSPI NOR flash which can
be found on many RISC-V platforms. This makes way for significant
optimization of RAM footprint. The XIP kernel is not compressed
since it has to run directly from flash, so it will occupy more
space on the non-volatile storage. The physical flash address used
to link the kernel object files and for storing it has to be known
at compile time and is represented by a Kconfig option.

XIP on RISC-V will for the time being only work on MMU-enabled
kernels.

Signed-off-by: Vitaly Wool <vitaly.wool@konsulko.com>
[Alex: Rebase on top of "Move kernel mapping outside the linear mapping" ]
Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
[Palmer: disable XIP for allyesconfig]
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
2021-04-26 08:31:28 -07:00

134 lines
2.6 KiB
ArmAsm

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2012 Regents of the University of California
* Copyright (C) 2017 SiFive
* Copyright (C) 2020 Vitaly Wool, Konsulko AB
*/
#include <asm/pgtable.h>
#define LOAD_OFFSET KERNEL_LINK_ADDR
/* No __ro_after_init data in the .rodata section - which will always be ro */
#define RO_AFTER_INIT_DATA
#include <asm/vmlinux.lds.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/cache.h>
#include <asm/thread_info.h>
OUTPUT_ARCH(riscv)
ENTRY(_start)
jiffies = jiffies_64;
SECTIONS
{
/* Beginning of code and text segment */
. = LOAD_OFFSET;
_xiprom = .;
_start = .;
HEAD_TEXT_SECTION
INIT_TEXT_SECTION(PAGE_SIZE)
/* we have to discard exit text and such at runtime, not link time */
.exit.text :
{
EXIT_TEXT
}
.text : {
_text = .;
_stext = .;
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
ENTRY_TEXT
IRQENTRY_TEXT
SOFTIRQENTRY_TEXT
*(.fixup)
_etext = .;
}
RO_DATA(L1_CACHE_BYTES)
.srodata : {
*(.srodata*)
}
.init.rodata : {
INIT_SETUP(16)
INIT_CALLS
CON_INITCALL
INIT_RAM_FS
}
_exiprom = .; /* End of XIP ROM area */
/*
* From this point, stuff is considered writable and will be copied to RAM
*/
__data_loc = ALIGN(16); /* location in file */
. = LOAD_OFFSET + XIP_OFFSET; /* location in memory */
_sdata = .; /* Start of data section */
_data = .;
RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
_edata = .;
__start_ro_after_init = .;
.data.ro_after_init : AT(ADDR(.data.ro_after_init) - LOAD_OFFSET) {
*(.data..ro_after_init)
}
__end_ro_after_init = .;
. = ALIGN(PAGE_SIZE);
__init_begin = .;
.init.data : {
INIT_DATA
}
.exit.data : {
EXIT_DATA
}
. = ALIGN(8);
__soc_early_init_table : {
__soc_early_init_table_start = .;
KEEP(*(__soc_early_init_table))
__soc_early_init_table_end = .;
}
__soc_builtin_dtb_table : {
__soc_builtin_dtb_table_start = .;
KEEP(*(__soc_builtin_dtb_table))
__soc_builtin_dtb_table_end = .;
}
PERCPU_SECTION(L1_CACHE_BYTES)
. = ALIGN(PAGE_SIZE);
__init_end = .;
.sdata : {
__global_pointer$ = . + 0x800;
*(.sdata*)
*(.sbss*)
}
BSS_SECTION(PAGE_SIZE, PAGE_SIZE, 0)
EXCEPTION_TABLE(0x10)
.rel.dyn : AT(ADDR(.rel.dyn) - LOAD_OFFSET) {
*(.rel.dyn*)
}
/*
* End of copied data. We need a dummy section to get its LMA.
* Also located before final ALIGN() as trailing padding is not stored
* in the resulting binary file and useless to copy.
*/
.data.endmark : AT(ADDR(.data.endmark) - LOAD_OFFSET) { }
_edata_loc = LOADADDR(.data.endmark);
. = ALIGN(PAGE_SIZE);
_end = .;
STABS_DEBUG
DWARF_DEBUG
DISCARDS
}