[linux-block.git] / arch / arm64 / include / asm / assembler.h

/*
 * Based on arch/arm/include/asm/assembler.h, arch/arm/mm/proc-macros.S
 *
 * Copyright (C) 1996-2000 Russell King
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASSEMBLY__
#error "Only include this from assembly code"
#endif

#ifndef __ASM_ASSEMBLER_H
#define __ASM_ASSEMBLER_H

#include <asm/asm-offsets.h>
#include <asm/cpufeature.h>
#include <asm/page.h>
#include <asm/pgtable-hwdef.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>

/*
 * Enable and disable interrupts.
 */
	.macro	disable_irq
	msr	daifset, #2
	.endm

	.macro	enable_irq
	msr	daifclr, #2
	.endm

	.macro	save_and_disable_irq, flags
	mrs	\flags, daif
	msr	daifset, #2
	.endm

	.macro	restore_irq, flags
	msr	daif, \flags
	.endm

/*
 * Enable and disable debug exceptions.
 */
	.macro	disable_dbg
	msr	daifset, #8
	.endm

	.macro	enable_dbg
	msr	daifclr, #8
	.endm

	.macro	disable_step_tsk, flgs, tmp
	tbz	\flgs, #TIF_SINGLESTEP, 9990f
	mrs	\tmp, mdscr_el1
	bic	\tmp, \tmp, #1
	msr	mdscr_el1, \tmp
	isb	// Synchronise with enable_dbg
9990:
	.endm

	.macro	enable_step_tsk, flgs, tmp
	tbz	\flgs, #TIF_SINGLESTEP, 9990f
	disable_dbg
	mrs	\tmp, mdscr_el1
	orr	\tmp, \tmp, #1
	msr	mdscr_el1, \tmp
9990:
	.endm

/*
 * Enable both debug exceptions and interrupts. This is likely to be
 * faster than two daifclr operations, since writes to this register
 * are self-synchronising.
 */
	.macro	enable_dbg_and_irq
	msr	daifclr, #(8 | 2)
	.endm

/*
 * SMP data memory barrier
 */
	.macro	smp_dmb, opt
	dmb	\opt
	.endm

/*
 * NOP sequence
 */
	.macro	nops, num
	.rept	\num
	nop
	.endr
	.endm

/*
 * Emit an entry into the exception table
 */
	.macro		_asm_extable, from, to
	.pushsection	__ex_table, "a"
	.align		3
	.long		(\from - .), (\to - .)
	.popsection
	.endm

#define USER(l, x...)				\
9999:	x;					\
	_asm_extable	9999b, l

/*
 * Register aliases.
 */
lr	.req	x30		// link register

/*
 * Vector entry
 */
	 .macro	ventry	label
	.align	7
	b	\label
	.endm

/*
 * Select code when configured for BE.
 */
#ifdef CONFIG_CPU_BIG_ENDIAN
#define CPU_BE(code...) code
#else
#define CPU_BE(code...)
#endif

/*
 * Select code when configured for LE.
 */
#ifdef CONFIG_CPU_BIG_ENDIAN
#define CPU_LE(code...)
#else
#define CPU_LE(code...) code
#endif

/*
 * Define a macro that constructs a 64-bit value by concatenating two
 * 32-bit registers. Note that on big endian systems the order of the
 * registers is swapped.
 */
#ifndef CONFIG_CPU_BIG_ENDIAN
	.macro	regs_to_64, rd, lbits, hbits
#else
	.macro	regs_to_64, rd, hbits, lbits
#endif
	orr	\rd, \lbits, \hbits, lsl #32
	.endm

/*
 * Pseudo-ops for PC-relative adr/ldr/str <reg>, <symbol> where
 * <symbol> is within the range +/- 4 GB of the PC when running
 * in core kernel context. In module context, a movz/movk sequence
 * is used, since modules may be loaded far away from the kernel
 * when KASLR is in effect.
 */
	/*
	 * @dst: destination register (64 bit wide)
	 * @sym: name of the symbol
	 */
	.macro	adr_l, dst, sym
#ifndef MODULE
	adrp	\dst, \sym
	add	\dst, \dst, :lo12:\sym
#else
	movz	\dst, #:abs_g3:\sym
	movk	\dst, #:abs_g2_nc:\sym
	movk	\dst, #:abs_g1_nc:\sym
	movk	\dst, #:abs_g0_nc:\sym
#endif
	.endm

	/*
	 * @dst: destination register (32 or 64 bit wide)
	 * @sym: name of the symbol
	 * @tmp: optional 64-bit scratch register to be used if <dst> is a
	 *       32-bit wide register, in which case it cannot be used to hold
	 *       the address
	 */
	.macro	ldr_l, dst, sym, tmp=
#ifndef MODULE
	.ifb	\tmp
	adrp	\dst, \sym
	ldr	\dst, [\dst, :lo12:\sym]
	.else
	adrp	\tmp, \sym
	ldr	\dst, [\tmp, :lo12:\sym]
	.endif
#else
	.ifb	\tmp
	adr_l	\dst, \sym
	ldr	\dst, [\dst]
	.else
	adr_l	\tmp, \sym
	ldr	\dst, [\tmp]
	.endif
#endif
	.endm

	/*
	 * @src: source register (32 or 64 bit wide)
	 * @sym: name of the symbol
	 * @tmp: mandatory 64-bit scratch register to calculate the address
	 *       while <src> needs to be preserved.
	 */
	.macro	str_l, src, sym, tmp
#ifndef MODULE
	adrp	\tmp, \sym
	str	\src, [\tmp, :lo12:\sym]
#else
	adr_l	\tmp, \sym
	str	\src, [\tmp]
#endif
	.endm

	/*
	 * @dst: Result of per_cpu(sym, smp_processor_id())
	 * @sym: The name of the per-cpu variable
	 * @tmp: scratch register
	 */
	.macro adr_this_cpu, dst, sym, tmp
	adr_l	\dst, \sym
	mrs	\tmp, tpidr_el1
	add	\dst, \dst, \tmp
	.endm

	/*
	 * @dst: Result of READ_ONCE(per_cpu(sym, smp_processor_id()))
	 * @sym: The name of the per-cpu variable
	 * @tmp: scratch register
	 */
	.macro ldr_this_cpu dst, sym, tmp
	adr_l	\dst, \sym
	mrs	\tmp, tpidr_el1
	ldr	\dst, [\dst, \tmp]
	.endm

/*
 * vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
 */
	.macro	vma_vm_mm, rd, rn
	ldr	\rd, [\rn, #VMA_VM_MM]
	.endm

/*
 * mmid - get context id from mm pointer (mm->context.id)
 */
	.macro	mmid, rd, rn
	ldr	\rd, [\rn, #MM_CONTEXT_ID]
	.endm
/*
 * read_ctr - read CTR_EL0. If the system has mismatched
 * cache line sizes, provide the system wide safe value
 * from arm64_ftr_reg_ctrel0.sys_val
 */
	.macro	read_ctr, reg
alternative_if_not ARM64_MISMATCHED_CACHE_LINE_SIZE
	mrs	\reg, ctr_el0			// read CTR
	nop
alternative_else
	ldr_l	\reg, arm64_ftr_reg_ctrel0 + ARM64_FTR_SYSVAL
alternative_endif
	.endm


/*
 * raw_dcache_line_size - get the minimum D-cache line size on this CPU
 * from the CTR register.
 */
	.macro	raw_dcache_line_size, reg, tmp
	mrs	\tmp, ctr_el0			// read CTR
	ubfm	\tmp, \tmp, #16, #19		// cache line size encoding
	mov	\reg, #4			// bytes per word
	lsl	\reg, \reg, \tmp		// actual cache line size
	.endm

/*
 * dcache_line_size - get the safe D-cache line size across all CPUs
 */
	.macro	dcache_line_size, reg, tmp
	read_ctr	\tmp
	ubfm		\tmp, \tmp, #16, #19	// cache line size encoding
	mov		\reg, #4		// bytes per word
	lsl		\reg, \reg, \tmp	// actual cache line size
	.endm

/*
 * raw_icache_line_size - get the minimum I-cache line size on this CPU
 * from the CTR register.
 */
	.macro	raw_icache_line_size, reg, tmp
	mrs	\tmp, ctr_el0			// read CTR
	and	\tmp, \tmp, #0xf		// cache line size encoding
	mov	\reg, #4			// bytes per word
	lsl	\reg, \reg, \tmp		// actual cache line size
	.endm

/*
 * icache_line_size - get the safe I-cache line size across all CPUs
 */
	.macro	icache_line_size, reg, tmp
	read_ctr	\tmp
	and		\tmp, \tmp, #0xf	// cache line size encoding
	mov		\reg, #4		// bytes per word
	lsl		\reg, \reg, \tmp	// actual cache line size
	.endm

/*
 * tcr_set_idmap_t0sz - update TCR.T0SZ so that we can load the ID map
 */
	.macro	tcr_set_idmap_t0sz, valreg, tmpreg
#ifndef CONFIG_ARM64_VA_BITS_48
	ldr_l	\tmpreg, idmap_t0sz
	bfi	\valreg, \tmpreg, #TCR_T0SZ_OFFSET, #TCR_TxSZ_WIDTH
#endif
	.endm

/*
 * Macro to perform a data cache maintenance for the interval
 * [kaddr, kaddr + size)
 *
 * 	op:		operation passed to dc instruction
 * 	domain:		domain used in dsb instruciton
 * 	kaddr:		starting virtual address of the region
 * 	size:		size of the region
 * 	Corrupts:	kaddr, size, tmp1, tmp2
 */
	.macro dcache_by_line_op op, domain, kaddr, size, tmp1, tmp2
	dcache_line_size \tmp1, \tmp2
	add	\size, \kaddr, \size
	sub	\tmp2, \tmp1, #1
	bic	\kaddr, \kaddr, \tmp2
9998:
	.if	(\op == cvau || \op == cvac)
alternative_if_not ARM64_WORKAROUND_CLEAN_CACHE
	dc	\op, \kaddr
alternative_else
	dc	civac, \kaddr
alternative_endif
	.else
	dc	\op, \kaddr
	.endif
	add	\kaddr, \kaddr, \tmp1
	cmp	\kaddr, \size
	b.lo	9998b
	dsb	\domain
	.endm

/*
 * reset_pmuserenr_el0 - reset PMUSERENR_EL0 if PMUv3 present
 */
	.macro	reset_pmuserenr_el0, tmpreg
	mrs	\tmpreg, id_aa64dfr0_el1	// Check ID_AA64DFR0_EL1 PMUVer
	sbfx	\tmpreg, \tmpreg, #8, #4
	cmp	\tmpreg, #1			// Skip if no PMU present
	b.lt	9000f
	msr	pmuserenr_el0, xzr		// Disable PMU access from EL0
9000:
	.endm

/*
 * copy_page - copy src to dest using temp registers t1-t8
 */
	.macro copy_page dest:req src:req t1:req t2:req t3:req t4:req t5:req t6:req t7:req t8:req
9998:	ldp	\t1, \t2, [\src]
	ldp	\t3, \t4, [\src, #16]
	ldp	\t5, \t6, [\src, #32]
	ldp	\t7, \t8, [\src, #48]
	add	\src, \src, #64
	stnp	\t1, \t2, [\dest]
	stnp	\t3, \t4, [\dest, #16]
	stnp	\t5, \t6, [\dest, #32]
	stnp	\t7, \t8, [\dest, #48]
	add	\dest, \dest, #64
	tst	\src, #(PAGE_SIZE - 1)
	b.ne	9998b
	.endm

/*
 * Annotate a function as position independent, i.e., safe to be called before
 * the kernel virtual mapping is activated.
 */
#define ENDPIPROC(x)			\
	.globl	__pi_##x;		\
	.type 	__pi_##x, %function;	\
	.set	__pi_##x, x;		\
	.size	__pi_##x, . - x;	\
	ENDPROC(x)

	/*
	 * Emit a 64-bit absolute little endian symbol reference in a way that
	 * ensures that it will be resolved at build time, even when building a
	 * PIE binary. This requires cooperation from the linker script, which
	 * must emit the lo32/hi32 halves individually.
	 */
	.macro	le64sym, sym
	.long	\sym\()_lo32
	.long	\sym\()_hi32
	.endm

	/*
	 * mov_q - move an immediate constant into a 64-bit register using
	 *         between 2 and 4 movz/movk instructions (depending on the
	 *         magnitude and sign of the operand)
	 */
	.macro	mov_q, reg, val
	.if (((\val) >> 31) == 0 || ((\val) >> 31) == 0x1ffffffff)
	movz	\reg, :abs_g1_s:\val
	.else
	.if (((\val) >> 47) == 0 || ((\val) >> 47) == 0x1ffff)
	movz	\reg, :abs_g2_s:\val
	.else
	movz	\reg, :abs_g3:\val
	movk	\reg, :abs_g2_nc:\val
	.endif
	movk	\reg, :abs_g1_nc:\val
	.endif
	movk	\reg, :abs_g0_nc:\val
	.endm

/*
 * Return the current thread_info.
 */
	.macro	get_thread_info, rd
	mrs	\rd, sp_el0
	.endm

/*
 * Errata workaround post TTBR0_EL1 update.
 */
	.macro	post_ttbr0_update_workaround
#ifdef CONFIG_CAVIUM_ERRATUM_27456
alternative_if ARM64_WORKAROUND_CAVIUM_27456
	ic	iallu
	dsb	nsh
	isb
alternative_else_nop_endif
#endif
	.endm

#endif	/* __ASM_ASSEMBLER_H */
Commit	Line	Data
0be7320a	1	/*
7b7293ae	2	* Based on arch/arm/include/asm/assembler.h, arch/arm/mm/proc-macros.S
0be7320a CM	3	*
	4	* Copyright (C) 1996-2000 Russell King
	5	* Copyright (C) 2012 ARM Ltd.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19	#ifndef __ASSEMBLY__
	20	#error "Only include this from assembly code"
	21	#endif
	22
f3e39273 MZ	23	#ifndef __ASM_ASSEMBLER_H
	24	#define __ASM_ASSEMBLER_H
	25
7b7293ae	26	#include <asm/asm-offsets.h>
823066d9	27	#include <asm/cpufeature.h>
5003dbde	28	#include <asm/page.h>
7b7293ae	29	#include <asm/pgtable-hwdef.h>
0be7320a	30	#include <asm/ptrace.h>
2a283070	31	#include <asm/thread_info.h>
0be7320a	32
0be7320a CM	33	/*
	34	* Enable and disable interrupts.
	35	*/
	36	.macro disable_irq
	37	msr daifset, #2
	38	.endm
	39
	40	.macro enable_irq
	41	msr daifclr, #2
	42	.endm
	43
4b65a5db CM	44	.macro save_and_disable_irq, flags
	45	mrs \flags, daif
	46	msr daifset, #2
	47	.endm
	48
	49	.macro restore_irq, flags
	50	msr daif, \flags
	51	.endm
	52
0be7320a CM	53	/*
	54	* Enable and disable debug exceptions.
	55	*/
	56	.macro disable_dbg
	57	msr daifset, #8
	58	.endm
	59
	60	.macro enable_dbg
	61	msr daifclr, #8
	62	.endm
	63
2a283070 WD	64	.macro disable_step_tsk, flgs, tmp
2a283070 WD	65	tbz \flgs, #TIF_SINGLESTEP, 9990f
0be7320a CM	66	mrs \tmp, mdscr_el1
	67	bic \tmp, \tmp, #1
	68	msr mdscr_el1, \tmp
2a283070 WD	69	isb // Synchronise with enable_dbg
2a283070 WD	70	9990:
0be7320a CM	71	.endm
0be7320a CM	72
2a283070 WD	73	.macro enable_step_tsk, flgs, tmp
	74	tbz \flgs, #TIF_SINGLESTEP, 9990f
	75	disable_dbg
0be7320a CM	76	mrs \tmp, mdscr_el1
	77	orr \tmp, \tmp, #1
	78	msr mdscr_el1, \tmp
2a283070	79	9990:
0be7320a CM	80	.endm
0be7320a CM	81
2a283070 WD	82	/*
	83	* Enable both debug exceptions and interrupts. This is likely to be
	84	* faster than two daifclr operations, since writes to this register
	85	* are self-synchronising.
	86	*/
	87	.macro enable_dbg_and_irq
	88	msr daifclr, #(8 \| 2)
0be7320a CM	89	.endm
	90
	91	/*
	92	* SMP data memory barrier
	93	*/
	94	.macro smp_dmb, opt
0be7320a	95	dmb \opt
0be7320a CM	96	.endm
0be7320a CM	97
f99a250c WD	98	/*
	99	* NOP sequence
	100	*/
	101	.macro nops, num
	102	.rept \num
	103	nop
	104	.endr
	105	.endm
	106
6c94f27a AB	107	/*
	108	* Emit an entry into the exception table
	109	*/
	110	.macro _asm_extable, from, to
	111	.pushsection __ex_table, "a"
	112	.align 3
	113	.long (\from - .), (\to - .)
	114	.popsection
	115	.endm
	116
0be7320a CM	117	#define USER(l, x...) \
0be7320a CM	118	9999: x; \
6c94f27a	119	_asm_extable 9999b, l
0be7320a CM	120
	121	/*
	122	* Register aliases.
	123	*/
	124	lr .req x30 // link register
dc637f1f MZ	125
	126	/*
	127	* Vector entry
	128	*/
	129	.macro ventry label
	130	.align 7
	131	b \label
	132	.endm
e68bedaa ML	133
	134	/*
	135	* Select code when configured for BE.
	136	*/
	137	#ifdef CONFIG_CPU_BIG_ENDIAN
	138	#define CPU_BE(code...) code
	139	#else
	140	#define CPU_BE(code...)
	141	#endif
	142
	143	/*
	144	* Select code when configured for LE.
	145	*/
	146	#ifdef CONFIG_CPU_BIG_ENDIAN
	147	#define CPU_LE(code...)
	148	#else
	149	#define CPU_LE(code...) code
	150	#endif
	151
55b89540 ML	152	/*
	153	* Define a macro that constructs a 64-bit value by concatenating two
	154	* 32-bit registers. Note that on big endian systems the order of the
	155	* registers is swapped.
	156	*/
	157	#ifndef CONFIG_CPU_BIG_ENDIAN
	158	.macro regs_to_64, rd, lbits, hbits
	159	#else
	160	.macro regs_to_64, rd, hbits, lbits
	161	#endif
	162	orr \rd, \lbits, \hbits, lsl #32
	163	.endm
f3e39273	164
b784a5d9 AB	165	/*
b784a5d9 AB	166	* Pseudo-ops for PC-relative adr/ldr/str <reg>, <symbol> where
41c066f2 AB	167	* <symbol> is within the range +/- 4 GB of the PC when running
	168	* in core kernel context. In module context, a movz/movk sequence
	169	* is used, since modules may be loaded far away from the kernel
	170	* when KASLR is in effect.
b784a5d9 AB	171	*/
	172	/*
	173	* @dst: destination register (64 bit wide)
	174	* @sym: name of the symbol
b784a5d9	175	*/
41c066f2 AB	176	.macro adr_l, dst, sym
41c066f2 AB	177	#ifndef MODULE
b784a5d9 AB	178	adrp \dst, \sym
b784a5d9 AB	179	add \dst, \dst, :lo12:\sym
41c066f2 AB	180	#else
	181	movz \dst, #:abs_g3:\sym
	182	movk \dst, #:abs_g2_nc:\sym
	183	movk \dst, #:abs_g1_nc:\sym
	184	movk \dst, #:abs_g0_nc:\sym
	185	#endif
b784a5d9 AB	186	.endm
	187
	188	/*
	189	* @dst: destination register (32 or 64 bit wide)
	190	* @sym: name of the symbol
	191	* @tmp: optional 64-bit scratch register to be used if <dst> is a
	192	* 32-bit wide register, in which case it cannot be used to hold
	193	* the address
	194	*/
	195	.macro ldr_l, dst, sym, tmp=
41c066f2	196	#ifndef MODULE
b784a5d9 AB	197	.ifb \tmp
	198	adrp \dst, \sym
	199	ldr \dst, [\dst, :lo12:\sym]
	200	.else
	201	adrp \tmp, \sym
	202	ldr \dst, [\tmp, :lo12:\sym]
	203	.endif
41c066f2 AB	204	#else
	205	.ifb \tmp
	206	adr_l \dst, \sym
	207	ldr \dst, [\dst]
	208	.else
	209	adr_l \tmp, \sym
	210	ldr \dst, [\tmp]
	211	.endif
	212	#endif
b784a5d9 AB	213	.endm
	214
	215	/*
	216	* @src: source register (32 or 64 bit wide)
	217	* @sym: name of the symbol
	218	* @tmp: mandatory 64-bit scratch register to calculate the address
	219	* while <src> needs to be preserved.
	220	*/
	221	.macro str_l, src, sym, tmp
41c066f2	222	#ifndef MODULE
b784a5d9 AB	223	adrp \tmp, \sym
b784a5d9 AB	224	str \src, [\tmp, :lo12:\sym]
41c066f2 AB	225	#else
	226	adr_l \tmp, \sym
	227	str \src, [\tmp]
	228	#endif
b784a5d9 AB	229	.endm
b784a5d9 AB	230
aa4d5d3c	231	/*
1b7e2296	232	* @dst: Result of per_cpu(sym, smp_processor_id())
aa4d5d3c	233	* @sym: The name of the per-cpu variable
aa4d5d3c JM	234	* @tmp: scratch register
aa4d5d3c JM	235	*/
1b7e2296 MR	236	.macro adr_this_cpu, dst, sym, tmp
1b7e2296 MR	237	adr_l \dst, \sym
aa4d5d3c	238	mrs \tmp, tpidr_el1
1b7e2296 MR	239	add \dst, \dst, \tmp
	240	.endm
	241
	242	/*
	243	* @dst: Result of READ_ONCE(per_cpu(sym, smp_processor_id()))
	244	* @sym: The name of the per-cpu variable
	245	* @tmp: scratch register
	246	*/
	247	.macro ldr_this_cpu dst, sym, tmp
	248	adr_l \dst, \sym
	249	mrs \tmp, tpidr_el1
	250	ldr \dst, [\dst, \tmp]
aa4d5d3c JM	251	.endm
aa4d5d3c JM	252
7b7293ae GL	253	/*
	254	* vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
	255	*/
	256	.macro vma_vm_mm, rd, rn
	257	ldr \rd, [\rn, #VMA_VM_MM]
	258	.endm
	259
	260	/*
	261	* mmid - get context id from mm pointer (mm->context.id)
	262	*/
	263	.macro mmid, rd, rn
	264	ldr \rd, [\rn, #MM_CONTEXT_ID]
	265	.endm
116c81f4 SP	266	/*
	267	* read_ctr - read CTR_EL0. If the system has mismatched
	268	* cache line sizes, provide the system wide safe value
	269	* from arm64_ftr_reg_ctrel0.sys_val
	270	*/
	271	.macro read_ctr, reg
	272	alternative_if_not ARM64_MISMATCHED_CACHE_LINE_SIZE
	273	mrs \reg, ctr_el0 // read CTR
	274	nop
	275	alternative_else
	276	ldr_l \reg, arm64_ftr_reg_ctrel0 + ARM64_FTR_SYSVAL
	277	alternative_endif
	278	.endm
	279
7b7293ae GL	280
7b7293ae GL	281	/*
072f0a63 SP	282	* raw_dcache_line_size - get the minimum D-cache line size on this CPU
072f0a63 SP	283	* from the CTR register.
7b7293ae	284	*/
072f0a63	285	.macro raw_dcache_line_size, reg, tmp
7b7293ae GL	286	mrs \tmp, ctr_el0 // read CTR
	287	ubfm \tmp, \tmp, #16, #19 // cache line size encoding
	288	mov \reg, #4 // bytes per word
	289	lsl \reg, \reg, \tmp // actual cache line size
	290	.endm
	291
	292	/*
072f0a63	293	* dcache_line_size - get the safe D-cache line size across all CPUs
7b7293ae	294	*/
072f0a63	295	.macro dcache_line_size, reg, tmp
116c81f4 SP	296	read_ctr \tmp
	297	ubfm \tmp, \tmp, #16, #19 // cache line size encoding
	298	mov \reg, #4 // bytes per word
	299	lsl \reg, \reg, \tmp // actual cache line size
072f0a63 SP	300	.endm
	301
	302	/*
	303	* raw_icache_line_size - get the minimum I-cache line size on this CPU
	304	* from the CTR register.
	305	*/
	306	.macro raw_icache_line_size, reg, tmp
7b7293ae GL	307	mrs \tmp, ctr_el0 // read CTR
	308	and \tmp, \tmp, #0xf // cache line size encoding
	309	mov \reg, #4 // bytes per word
	310	lsl \reg, \reg, \tmp // actual cache line size
	311	.endm
	312
072f0a63 SP	313	/*
	314	* icache_line_size - get the safe I-cache line size across all CPUs
	315	*/
	316	.macro icache_line_size, reg, tmp
116c81f4 SP	317	read_ctr \tmp
	318	and \tmp, \tmp, #0xf // cache line size encoding
	319	mov \reg, #4 // bytes per word
	320	lsl \reg, \reg, \tmp // actual cache line size
072f0a63 SP	321	.endm
072f0a63 SP	322
7b7293ae GL	323	/*
	324	* tcr_set_idmap_t0sz - update TCR.T0SZ so that we can load the ID map
	325	*/
	326	.macro tcr_set_idmap_t0sz, valreg, tmpreg
	327	#ifndef CONFIG_ARM64_VA_BITS_48
	328	ldr_l \tmpreg, idmap_t0sz
	329	bfi \valreg, \tmpreg, #TCR_T0SZ_OFFSET, #TCR_TxSZ_WIDTH
	330	#endif
	331	.endm
	332
	333	/*
	334	* Macro to perform a data cache maintenance for the interval
	335	* [kaddr, kaddr + size)
	336	*
	337	* op: operation passed to dc instruction
	338	* domain: domain used in dsb instruciton
	339	* kaddr: starting virtual address of the region
	340	* size: size of the region
	341	* Corrupts: kaddr, size, tmp1, tmp2
	342	*/
	343	.macro dcache_by_line_op op, domain, kaddr, size, tmp1, tmp2
	344	dcache_line_size \tmp1, \tmp2
	345	add \size, \kaddr, \size
	346	sub \tmp2, \tmp1, #1
	347	bic \kaddr, \kaddr, \tmp2
823066d9 AP	348	9998:
	349	.if (\op == cvau \|\| \op == cvac)
	350	alternative_if_not ARM64_WORKAROUND_CLEAN_CACHE
	351	dc \op, \kaddr
	352	alternative_else
	353	dc civac, \kaddr
	354	alternative_endif
	355	.else
	356	dc \op, \kaddr
	357	.endif
7b7293ae GL	358	add \kaddr, \kaddr, \tmp1
	359	cmp \kaddr, \size
	360	b.lo 9998b
	361	dsb \domain
	362	.endm
	363
	364	/*
	365	* reset_pmuserenr_el0 - reset PMUSERENR_EL0 if PMUv3 present
	366	*/
	367	.macro reset_pmuserenr_el0, tmpreg
	368	mrs \tmpreg, id_aa64dfr0_el1 // Check ID_AA64DFR0_EL1 PMUVer
	369	sbfx \tmpreg, \tmpreg, #8, #4
	370	cmp \tmpreg, #1 // Skip if no PMU present
	371	b.lt 9000f
	372	msr pmuserenr_el0, xzr // Disable PMU access from EL0
	373	9000:
	374	.endm
	375
5003dbde GL	376	/*
	377	* copy_page - copy src to dest using temp registers t1-t8
	378	*/
	379	.macro copy_page dest:req src:req t1:req t2:req t3:req t4:req t5:req t6:req t7:req t8:req
	380	9998: ldp \t1, \t2, [\src]
	381	ldp \t3, \t4, [\src, #16]
	382	ldp \t5, \t6, [\src, #32]
	383	ldp \t7, \t8, [\src, #48]
	384	add \src, \src, #64
	385	stnp \t1, \t2, [\dest]
	386	stnp \t3, \t4, [\dest, #16]
	387	stnp \t5, \t6, [\dest, #32]
	388	stnp \t7, \t8, [\dest, #48]
	389	add \dest, \dest, #64
	390	tst \src, #(PAGE_SIZE - 1)
	391	b.ne 9998b
	392	.endm
	393
20791846 AB	394	/*
	395	* Annotate a function as position independent, i.e., safe to be called before
	396	* the kernel virtual mapping is activated.
	397	*/
	398	#define ENDPIPROC(x) \
	399	.globl __pi_##x; \
	400	.type __pi_##x, %function; \
	401	.set __pi_##x, x; \
	402	.size __pi_##x, . - x; \
	403	ENDPROC(x)
	404
6ad1fe5d AB	405	/*
	406	* Emit a 64-bit absolute little endian symbol reference in a way that
	407	* ensures that it will be resolved at build time, even when building a
	408	* PIE binary. This requires cooperation from the linker script, which
	409	* must emit the lo32/hi32 halves individually.
	410	*/
	411	.macro le64sym, sym
	412	.long \sym\()_lo32
	413	.long \sym\()_hi32
	414	.endm
	415
30b5ba5c AB	416	/*
	417	* mov_q - move an immediate constant into a 64-bit register using
	418	* between 2 and 4 movz/movk instructions (depending on the
	419	* magnitude and sign of the operand)
	420	*/
	421	.macro mov_q, reg, val
	422	.if (((\val) >> 31) == 0 \|\| ((\val) >> 31) == 0x1ffffffff)
	423	movz \reg, :abs_g1_s:\val
	424	.else
	425	.if (((\val) >> 47) == 0 \|\| ((\val) >> 47) == 0x1ffff)
	426	movz \reg, :abs_g2_s:\val
	427	.else
	428	movz \reg, :abs_g3:\val
	429	movk \reg, :abs_g2_nc:\val
	430	.endif
	431	movk \reg, :abs_g1_nc:\val
	432	.endif
	433	movk \reg, :abs_g0_nc:\val
	434	.endm
	435
4b65a5db CM	436	/*
	437	* Return the current thread_info.
	438	*/
	439	.macro get_thread_info, rd
	440	mrs \rd, sp_el0
	441	.endm
	442
f33bcf03 CM	443	/*
	444	* Errata workaround post TTBR0_EL1 update.
	445	*/
	446	.macro post_ttbr0_update_workaround
	447	#ifdef CONFIG_CAVIUM_ERRATUM_27456
	448	alternative_if ARM64_WORKAROUND_CAVIUM_27456
	449	ic iallu
	450	dsb nsh
	451	isb
	452	alternative_else_nop_endif
	453	#endif
	454	.endm
	455
f3e39273	456	#endif /* __ASM_ASSEMBLER_H */