Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 594 insertions, 0 deletions

diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
new file mode 100644
index 000000000..29e290017
--- /dev/null
+++ b/arch/arm/kernel/head.S
@@ -0,0 +1,594 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  linux/arch/arm/kernel/head.S
+ *
+ *  Copyright (C) 1994-2002 Russell King
+ *  Copyright (c) 2003 ARM Limited
+ *  All Rights Reserved
+ *
+ *  Kernel startup code for all 32-bit CPUs
+ */
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <linux/pgtable.h>
+
+#include <asm/assembler.h>
+#include <asm/cp15.h>
+#include <asm/domain.h>
+#include <asm/ptrace.h>
+#include <asm/asm-offsets.h>
+#include <asm/memory.h>
+#include <asm/thread_info.h>
+
+#if defined(CONFIG_DEBUG_LL) && !defined(CONFIG_DEBUG_SEMIHOSTING)
+#include CONFIG_DEBUG_LL_INCLUDE
+#endif
+/*
+ * swapper_pg_dir is the virtual address of the initial page table.
+ * We place the page tables 16K below KERNEL_RAM_VADDR.  Therefore, we must
+ * make sure that KERNEL_RAM_VADDR is correctly set.  Currently, we expect
+ * the least significant 16 bits to be 0x8000, but we could probably
+ * relax this restriction to KERNEL_RAM_VADDR >= PAGE_OFFSET + 0x4000.
+ */
+#define KERNEL_RAM_VADDR	(KERNEL_OFFSET + TEXT_OFFSET)
+#if (KERNEL_RAM_VADDR & 0xffff) != 0x8000
+#error KERNEL_RAM_VADDR must start at 0xXXXX8000
+#endif
+
+#ifdef CONFIG_ARM_LPAE
+	/* LPAE requires an additional page for the PGD */
+#define PG_DIR_SIZE	0x5000
+#define PMD_ENTRY_ORDER	3	/* PMD entry size is 2^PMD_ENTRY_ORDER */
+#else
+#define PG_DIR_SIZE	0x4000
+#define PMD_ENTRY_ORDER	2
+#endif
+
+	.globl	swapper_pg_dir
+	.equ	swapper_pg_dir, KERNEL_RAM_VADDR - PG_DIR_SIZE
+
+	/*
+	 * This needs to be assigned at runtime when the linker symbols are
+	 * resolved. These are unsigned 64bit really, but in this assembly code
+	 * We store them as 32bit.
+	 */
+	.pushsection .data
+	.align	2
+	.globl	kernel_sec_start
+	.globl	kernel_sec_end
+kernel_sec_start:
+	.long	0
+	.long	0
+kernel_sec_end:
+	.long	0
+	.long	0
+	.popsection
+
+	.macro	pgtbl, rd, phys
+	add	\rd, \phys, #TEXT_OFFSET
+	sub	\rd, \rd, #PG_DIR_SIZE
+	.endm
+
+/*
+ * Kernel startup entry point.
+ * ---------------------------
+ *
+ * This is normally called from the decompressor code.  The requirements
+ * are: MMU = off, D-cache = off, I-cache = dont care, r0 = 0,
+ * r1 = machine nr, r2 = atags or dtb pointer.
+ *
+ * This code is mostly position independent, so if you link the kernel at
+ * 0xc0008000, you call this at __pa(0xc0008000).
+ *
+ * See linux/arch/arm/tools/mach-types for the complete list of machine
+ * numbers for r1.
+ *
+ * We're trying to keep crap to a minimum; DO NOT add any machine specific
+ * crap here - that's what the boot loader (or in extreme, well justified
+ * circumstances, zImage) is for.
+ */
+	.arm
+
+	__HEAD
+ENTRY(stext)
+ ARM_BE8(setend	be )			@ ensure we are in BE8 mode
+
+ THUMB(	badr	r9, 1f		)	@ Kernel is always entered in ARM.
+ THUMB(	bx	r9		)	@ If this is a Thumb-2 kernel,
+ THUMB(	.thumb			)	@ switch to Thumb now.
+ THUMB(1:			)
+
+#ifdef CONFIG_ARM_VIRT_EXT
+	bl	__hyp_stub_install
+#endif
+	@ ensure svc mode and all interrupts masked
+	safe_svcmode_maskall r9
+
+	mrc	p15, 0, r9, c0, c0		@ get processor id
+	bl	__lookup_processor_type		@ r5=procinfo r9=cpuid
+	movs	r10, r5				@ invalid processor (r5=0)?
+ THUMB( it	eq )		@ force fixup-able long branch encoding
+	beq	__error_p			@ yes, error 'p'
+
+#ifdef CONFIG_ARM_LPAE
+	mrc	p15, 0, r3, c0, c1, 4		@ read ID_MMFR0
+	and	r3, r3, #0xf			@ extract VMSA support
+	cmp	r3, #5				@ long-descriptor translation table format?
+ THUMB( it	lo )				@ force fixup-able long branch encoding
+	blo	__error_lpae			@ only classic page table format
+#endif
+
+#ifndef CONFIG_XIP_KERNEL
+	adr_l	r8, _text			@ __pa(_text)
+	sub	r8, r8, #TEXT_OFFSET		@ PHYS_OFFSET
+#else
+	ldr	r8, =PLAT_PHYS_OFFSET		@ always constant in this case
+#endif
+
+	/*
+	 * r1 = machine no, r2 = atags or dtb,
+	 * r8 = phys_offset, r9 = cpuid, r10 = procinfo
+	 */
+	bl	__vet_atags
+#ifdef CONFIG_SMP_ON_UP
+	bl	__fixup_smp
+#endif
+#ifdef CONFIG_ARM_PATCH_PHYS_VIRT
+	bl	__fixup_pv_table
+#endif
+	bl	__create_page_tables
+
+	/*
+	 * The following calls CPU specific code in a position independent
+	 * manner.  See arch/arm/mm/proc-*.S for details.  r10 = base of
+	 * xxx_proc_info structure selected by __lookup_processor_type
+	 * above.
+	 *
+	 * The processor init function will be called with:
+	 *  r1 - machine type
+	 *  r2 - boot data (atags/dt) pointer
+	 *  r4 - translation table base (low word)
+	 *  r5 - translation table base (high word, if LPAE)
+	 *  r8 - translation table base 1 (pfn if LPAE)
+	 *  r9 - cpuid
+	 *  r13 - virtual address for __enable_mmu -> __turn_mmu_on
+	 *
+	 * On return, the CPU will be ready for the MMU to be turned on,
+	 * r0 will hold the CPU control register value, r1, r2, r4, and
+	 * r9 will be preserved.  r5 will also be preserved if LPAE.
+	 */
+	ldr	r13, =__mmap_switched		@ address to jump to after
+						@ mmu has been enabled
+	badr	lr, 1f				@ return (PIC) address
+#ifdef CONFIG_ARM_LPAE
+	mov	r5, #0				@ high TTBR0
+	mov	r8, r4, lsr #12			@ TTBR1 is swapper_pg_dir pfn
+#else
+	mov	r8, r4				@ set TTBR1 to swapper_pg_dir
+#endif
+	ldr	r12, [r10, #PROCINFO_INITFUNC]
+	add	r12, r12, r10
+	ret	r12
+1:	b	__enable_mmu
+ENDPROC(stext)
+	.ltorg
+
+/*
+ * Setup the initial page tables.  We only setup the barest
+ * amount which are required to get the kernel running, which
+ * generally means mapping in the kernel code.
+ *
+ * r8 = phys_offset, r9 = cpuid, r10 = procinfo
+ *
+ * Returns:
+ *  r0, r3, r5-r7 corrupted
+ *  r4 = physical page table address
+ */
+__create_page_tables:
+	pgtbl	r4, r8				@ page table address
+
+	/*
+	 * Clear the swapper page table
+	 */
+	mov	r0, r4
+	mov	r3, #0
+	add	r6, r0, #PG_DIR_SIZE
+1:	str	r3, [r0], #4
+	str	r3, [r0], #4
+	str	r3, [r0], #4
+	str	r3, [r0], #4
+	teq	r0, r6
+	bne	1b
+
+#ifdef CONFIG_ARM_LPAE
+	/*
+	 * Build the PGD table (first level) to point to the PMD table. A PGD
+	 * entry is 64-bit wide.
+	 */
+	mov	r0, r4
+	add	r3, r4, #0x1000			@ first PMD table address
+	orr	r3, r3, #3			@ PGD block type
+	mov	r6, #4				@ PTRS_PER_PGD
+	mov	r7, #1 << (55 - 32)		@ L_PGD_SWAPPER
+1:
+#ifdef CONFIG_CPU_ENDIAN_BE8
+	str	r7, [r0], #4			@ set top PGD entry bits
+	str	r3, [r0], #4			@ set bottom PGD entry bits
+#else
+	str	r3, [r0], #4			@ set bottom PGD entry bits
+	str	r7, [r0], #4			@ set top PGD entry bits
+#endif
+	add	r3, r3, #0x1000			@ next PMD table
+	subs	r6, r6, #1
+	bne	1b
+
+	add	r4, r4, #0x1000			@ point to the PMD tables
+#ifdef CONFIG_CPU_ENDIAN_BE8
+	add	r4, r4, #4			@ we only write the bottom word
+#endif
+#endif
+
+	ldr	r7, [r10, #PROCINFO_MM_MMUFLAGS] @ mm_mmuflags
+
+	/*
+	 * Create identity mapping to cater for __enable_mmu.
+	 * This identity mapping will be removed by paging_init().
+	 */
+	adr_l	r5, __turn_mmu_on		@ _pa(__turn_mmu_on)
+	adr_l	r6, __turn_mmu_on_end		@ _pa(__turn_mmu_on_end)
+	mov	r5, r5, lsr #SECTION_SHIFT
+	mov	r6, r6, lsr #SECTION_SHIFT
+
+1:	orr	r3, r7, r5, lsl #SECTION_SHIFT	@ flags + kernel base
+	str	r3, [r4, r5, lsl #PMD_ENTRY_ORDER]	@ identity mapping
+	cmp	r5, r6
+	addlo	r5, r5, #1			@ next section
+	blo	1b
+
+	/*
+	 * The main matter: map in the kernel using section mappings, and
+	 * set two variables to indicate the physical start and end of the
+	 * kernel.
+	 */
+	add	r0, r4, #KERNEL_OFFSET >> (SECTION_SHIFT - PMD_ENTRY_ORDER)
+	ldr	r6, =(_end - 1)
+	adr_l	r5, kernel_sec_start		@ _pa(kernel_sec_start)
+#if defined CONFIG_CPU_ENDIAN_BE8 || defined CONFIG_CPU_ENDIAN_BE32
+	str	r8, [r5, #4]			@ Save physical start of kernel (BE)
+#else
+	str	r8, [r5]			@ Save physical start of kernel (LE)
+#endif
+	orr	r3, r8, r7			@ Add the MMU flags
+	add	r6, r4, r6, lsr #(SECTION_SHIFT - PMD_ENTRY_ORDER)
+1:	str	r3, [r0], #1 << PMD_ENTRY_ORDER
+	add	r3, r3, #1 << SECTION_SHIFT
+	cmp	r0, r6
+	bls	1b
+	eor	r3, r3, r7			@ Remove the MMU flags
+	adr_l	r5, kernel_sec_end		@ _pa(kernel_sec_end)
+#if defined CONFIG_CPU_ENDIAN_BE8 || defined CONFIG_CPU_ENDIAN_BE32
+	str	r3, [r5, #4]			@ Save physical end of kernel (BE)
+#else
+	str	r3, [r5]			@ Save physical end of kernel (LE)
+#endif
+
+#ifdef CONFIG_XIP_KERNEL
+	/*
+	 * Map the kernel image separately as it is not located in RAM.
+	 */
+#define XIP_START XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
+	mov	r3, pc
+	mov	r3, r3, lsr #SECTION_SHIFT
+	orr	r3, r7, r3, lsl #SECTION_SHIFT
+	add	r0, r4,  #(XIP_START & 0xff000000) >> (SECTION_SHIFT - PMD_ENTRY_ORDER)
+	str	r3, [r0, #((XIP_START & 0x00f00000) >> SECTION_SHIFT) << PMD_ENTRY_ORDER]!
+	ldr	r6, =(_edata_loc - 1)
+	add	r0, r0, #1 << PMD_ENTRY_ORDER
+	add	r6, r4, r6, lsr #(SECTION_SHIFT - PMD_ENTRY_ORDER)
+1:	cmp	r0, r6
+	add	r3, r3, #1 << SECTION_SHIFT
+	strls	r3, [r0], #1 << PMD_ENTRY_ORDER
+	bls	1b
+#endif
+
+	/*
+	 * Then map boot params address in r2 if specified.
+	 * We map 2 sections in case the ATAGs/DTB crosses a section boundary.
+	 */
+	mov	r0, r2, lsr #SECTION_SHIFT
+	cmp	r2, #0
+	ldrne	r3, =FDT_FIXED_BASE >> (SECTION_SHIFT - PMD_ENTRY_ORDER)
+	addne	r3, r3, r4
+	orrne	r6, r7, r0, lsl #SECTION_SHIFT
+	strne	r6, [r3], #1 << PMD_ENTRY_ORDER
+	addne	r6, r6, #1 << SECTION_SHIFT
+	strne	r6, [r3]
+
+#if defined(CONFIG_ARM_LPAE) && defined(CONFIG_CPU_ENDIAN_BE8)
+	sub	r4, r4, #4			@ Fixup page table pointer
+						@ for 64-bit descriptors
+#endif
+
+#ifdef CONFIG_DEBUG_LL
+#if !defined(CONFIG_DEBUG_ICEDCC) && !defined(CONFIG_DEBUG_SEMIHOSTING)
+	/*
+	 * Map in IO space for serial debugging.
+	 * This allows debug messages to be output
+	 * via a serial console before paging_init.
+	 */
+	addruart r7, r3, r0
+
+	mov	r3, r3, lsr #SECTION_SHIFT
+	mov	r3, r3, lsl #PMD_ENTRY_ORDER
+
+	add	r0, r4, r3
+	mov	r3, r7, lsr #SECTION_SHIFT
+	ldr	r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags
+	orr	r3, r7, r3, lsl #SECTION_SHIFT
+#ifdef CONFIG_ARM_LPAE
+	mov	r7, #1 << (54 - 32)		@ XN
+#ifdef CONFIG_CPU_ENDIAN_BE8
+	str	r7, [r0], #4
+	str	r3, [r0], #4
+#else
+	str	r3, [r0], #4
+	str	r7, [r0], #4
+#endif
+#else
+	orr	r3, r3, #PMD_SECT_XN
+	str	r3, [r0], #4
+#endif
+
+#else /* CONFIG_DEBUG_ICEDCC || CONFIG_DEBUG_SEMIHOSTING */
+	/* we don't need any serial debugging mappings */
+	ldr	r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags
+#endif
+
+#if defined(CONFIG_ARCH_NETWINDER) || defined(CONFIG_ARCH_CATS)
+	/*
+	 * If we're using the NetWinder or CATS, we also need to map
+	 * in the 16550-type serial port for the debug messages
+	 */
+	add	r0, r4, #0xff000000 >> (SECTION_SHIFT - PMD_ENTRY_ORDER)
+	orr	r3, r7, #0x7c000000
+	str	r3, [r0]
+#endif
+#ifdef CONFIG_ARCH_RPC
+	/*
+	 * Map in screen at 0x02000000 & SCREEN2_BASE
+	 * Similar reasons here - for debug.  This is
+	 * only for Acorn RiscPC architectures.
+	 */
+	add	r0, r4, #0x02000000 >> (SECTION_SHIFT - PMD_ENTRY_ORDER)
+	orr	r3, r7, #0x02000000
+	str	r3, [r0]
+	add	r0, r4, #0xd8000000 >> (SECTION_SHIFT - PMD_ENTRY_ORDER)
+	str	r3, [r0]
+#endif
+#endif
+#ifdef CONFIG_ARM_LPAE
+	sub	r4, r4, #0x1000		@ point to the PGD table
+#endif
+	ret	lr
+ENDPROC(__create_page_tables)
+	.ltorg
+
+#if defined(CONFIG_SMP)
+	.text
+	.arm
+ENTRY(secondary_startup_arm)
+ THUMB(	badr	r9, 1f		)	@ Kernel is entered in ARM.
+ THUMB(	bx	r9		)	@ If this is a Thumb-2 kernel,
+ THUMB(	.thumb			)	@ switch to Thumb now.
+ THUMB(1:			)
+ENTRY(secondary_startup)
+	/*
+	 * Common entry point for secondary CPUs.
+	 *
+	 * Ensure that we're in SVC mode, and IRQs are disabled.  Lookup
+	 * the processor type - there is no need to check the machine type
+	 * as it has already been validated by the primary processor.
+	 */
+
+ ARM_BE8(setend	be)				@ ensure we are in BE8 mode
+
+#ifdef CONFIG_ARM_VIRT_EXT
+	bl	__hyp_stub_install_secondary
+#endif
+	safe_svcmode_maskall r9
+
+	mrc	p15, 0, r9, c0, c0		@ get processor id
+	bl	__lookup_processor_type
+	movs	r10, r5				@ invalid processor?
+	moveq	r0, #'p'			@ yes, error 'p'
+ THUMB( it	eq )		@ force fixup-able long branch encoding
+	beq	__error_p
+
+	/*
+	 * Use the page tables supplied from  __cpu_up.
+	 */
+	adr_l	r3, secondary_data
+	mov_l	r12, __secondary_switched
+	ldrd	r4, r5, [r3, #0]		@ get secondary_data.pgdir
+ARM_BE8(eor	r4, r4, r5)			@ Swap r5 and r4 in BE:
+ARM_BE8(eor	r5, r4, r5)			@ it can be done in 3 steps
+ARM_BE8(eor	r4, r4, r5)			@ without using a temp reg.
+	ldr	r8, [r3, #8]			@ get secondary_data.swapper_pg_dir
+	badr	lr, __enable_mmu		@ return address
+	mov	r13, r12			@ __secondary_switched address
+	ldr	r12, [r10, #PROCINFO_INITFUNC]
+	add	r12, r12, r10			@ initialise processor
+						@ (return control reg)
+	ret	r12
+ENDPROC(secondary_startup)
+ENDPROC(secondary_startup_arm)
+
+ENTRY(__secondary_switched)
+#if defined(CONFIG_VMAP_STACK) && !defined(CONFIG_ARM_LPAE)
+	@ Before using the vmap'ed stack, we have to switch to swapper_pg_dir
+	@ as the ID map does not cover the vmalloc region.
+	mrc	p15, 0, ip, c2, c0, 1	@ read TTBR1
+	mcr	p15, 0, ip, c2, c0, 0	@ set TTBR0
+	instr_sync
+#endif
+	adr_l	r7, secondary_data + 12		@ get secondary_data.stack
+	ldr	sp, [r7]
+	ldr	r0, [r7, #4]			@ get secondary_data.task
+	mov	fp, #0
+	b	secondary_start_kernel
+ENDPROC(__secondary_switched)
+
+#endif /* defined(CONFIG_SMP) */
+
+
+
+/*
+ * Setup common bits before finally enabling the MMU.  Essentially
+ * this is just loading the page table pointer and domain access
+ * registers.  All these registers need to be preserved by the
+ * processor setup function (or set in the case of r0)
+ *
+ *  r0  = cp#15 control register
+ *  r1  = machine ID
+ *  r2  = atags or dtb pointer
+ *  r4  = TTBR pointer (low word)
+ *  r5  = TTBR pointer (high word if LPAE)
+ *  r9  = processor ID
+ *  r13 = *virtual* address to jump to upon completion
+ */
+__enable_mmu:
+#if defined(CONFIG_ALIGNMENT_TRAP) && __LINUX_ARM_ARCH__ < 6
+	orr	r0, r0, #CR_A
+#else
+	bic	r0, r0, #CR_A
+#endif
+#ifdef CONFIG_CPU_DCACHE_DISABLE
+	bic	r0, r0, #CR_C
+#endif
+#ifdef CONFIG_CPU_BPREDICT_DISABLE
+	bic	r0, r0, #CR_Z
+#endif
+#ifdef CONFIG_CPU_ICACHE_DISABLE
+	bic	r0, r0, #CR_I
+#endif
+#ifdef CONFIG_ARM_LPAE
+	mcrr	p15, 0, r4, r5, c2		@ load TTBR0
+#else
+	mov	r5, #DACR_INIT
+	mcr	p15, 0, r5, c3, c0, 0		@ load domain access register
+	mcr	p15, 0, r4, c2, c0, 0		@ load page table pointer
+#endif
+	b	__turn_mmu_on
+ENDPROC(__enable_mmu)
+
+/*
+ * Enable the MMU.  This completely changes the structure of the visible
+ * memory space.  You will not be able to trace execution through this.
+ * If you have an enquiry about this, *please* check the linux-arm-kernel
+ * mailing list archives BEFORE sending another post to the list.
+ *
+ *  r0  = cp#15 control register
+ *  r1  = machine ID
+ *  r2  = atags or dtb pointer
+ *  r9  = processor ID
+ *  r13 = *virtual* address to jump to upon completion
+ *
+ * other registers depend on the function called upon completion
+ */
+	.align	5
+	.pushsection	.idmap.text, "ax"
+ENTRY(__turn_mmu_on)
+	mov	r0, r0
+	instr_sync
+	mcr	p15, 0, r0, c1, c0, 0		@ write control reg
+	mrc	p15, 0, r3, c0, c0, 0		@ read id reg
+	instr_sync
+	mov	r3, r3
+	mov	r3, r13
+	ret	r3
+__turn_mmu_on_end:
+ENDPROC(__turn_mmu_on)
+	.popsection
+
+
+#ifdef CONFIG_SMP_ON_UP
+	__HEAD
+__fixup_smp:
+	and	r3, r9, #0x000f0000	@ architecture version
+	teq	r3, #0x000f0000		@ CPU ID supported?
+	bne	__fixup_smp_on_up	@ no, assume UP
+
+	bic	r3, r9, #0x00ff0000
+	bic	r3, r3, #0x0000000f	@ mask 0xff00fff0
+	mov	r4, #0x41000000
+	orr	r4, r4, #0x0000b000
+	orr	r4, r4, #0x00000020	@ val 0x4100b020
+	teq	r3, r4			@ ARM 11MPCore?
+	reteq	lr			@ yes, assume SMP
+
+	mrc	p15, 0, r0, c0, c0, 5	@ read MPIDR
+	and	r0, r0, #0xc0000000	@ multiprocessing extensions and
+	teq	r0, #0x80000000		@ not part of a uniprocessor system?
+	bne    __fixup_smp_on_up	@ no, assume UP
+
+	@ Core indicates it is SMP. Check for Aegis SOC where a single
+	@ Cortex-A9 CPU is present but SMP operations fault.
+	mov	r4, #0x41000000
+	orr	r4, r4, #0x0000c000
+	orr	r4, r4, #0x00000090
+	teq	r3, r4			@ Check for ARM Cortex-A9
+	retne	lr			@ Not ARM Cortex-A9,
+
+	@ If a future SoC *does* use 0x0 as the PERIPH_BASE, then the
+	@ below address check will need to be #ifdef'd or equivalent
+	@ for the Aegis platform.
+	mrc	p15, 4, r0, c15, c0	@ get SCU base address
+	teq	r0, #0x0		@ '0' on actual UP A9 hardware
+	beq	__fixup_smp_on_up	@ So its an A9 UP
+	ldr	r0, [r0, #4]		@ read SCU Config
+ARM_BE8(rev	r0, r0)			@ byteswap if big endian
+	and	r0, r0, #0x3		@ number of CPUs
+	teq	r0, #0x0		@ is 1?
+	retne	lr
+
+__fixup_smp_on_up:
+	adr_l	r4, __smpalt_begin
+	adr_l	r5, __smpalt_end
+	b	__do_fixup_smp_on_up
+ENDPROC(__fixup_smp)
+
+	.pushsection .data
+	.align	2
+	.globl	smp_on_up
+smp_on_up:
+	ALT_SMP(.long	1)
+	ALT_UP(.long	0)
+	.popsection
+#endif
+
+	.text
+__do_fixup_smp_on_up:
+	cmp	r4, r5
+	reths	lr
+	ldmia	r4, {r0, r6}
+ ARM(	str	r6, [r0, r4]	)
+ THUMB(	add	r0, r0, r4	)
+	add	r4, r4, #8
+#ifdef __ARMEB__
+ THUMB(	mov	r6, r6, ror #16	)	@ Convert word order for big-endian.
+#endif
+ THUMB(	strh	r6, [r0], #2	)	@ For Thumb-2, store as two halfwords
+ THUMB(	mov	r6, r6, lsr #16	)	@ to be robust against misaligned r0.
+ THUMB(	strh	r6, [r0]	)
+	b	__do_fixup_smp_on_up
+ENDPROC(__do_fixup_smp_on_up)
+
+ENTRY(fixup_smp)
+	stmfd	sp!, {r4 - r6, lr}
+	mov	r4, r0
+	add	r5, r0, r1
+	bl	__do_fixup_smp_on_up
+	ldmfd	sp!, {r4 - r6, pc}
+ENDPROC(fixup_smp)
+
+#include "head-common.S"