lib/cpus/aarch64/cpu_helpers.S - filogic/atf - Gitiles

 /*
  * Copyright (c) 2014-2017, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */

 #include <arch.h>
 #include <asm_macros.S>
 #include <assert_macros.S>
 #ifdef IMAGE_BL31
 #include <cpu_data.h>
 #endif
 #include <cpu_macros.S>
 #include <debug.h>
 #include <errata_report.h>

  /* Reset fn is needed in BL at reset vector */
 #if defined(IMAGE_BL1) || defined(IMAGE_BL31)
 	/*
 	 * The reset handler common to all platforms.  After a matching
 	 * cpu_ops structure entry is found, the correponding reset_handler
 	 * in the cpu_ops is invoked.
 	 * Clobbers: x0 - x19, x30
 	 */
 	.globl	reset_handler
 func reset_handler
 	mov	x19, x30

 	/* The plat_reset_handler can clobber x0 - x18, x30 */
 	bl	plat_reset_handler

 	/* Get the matching cpu_ops pointer */
 	bl	get_cpu_ops_ptr
 #if ENABLE_ASSERTIONS
 	cmp	x0, #0
 	ASM_ASSERT(ne)
 #endif

 	/* Get the cpu_ops reset handler */
 	ldr	x2, [x0, #CPU_RESET_FUNC]
 	mov	x30, x19
 	cbz	x2, 1f

 	/* The cpu_ops reset handler can clobber x0 - x19, x30 */
 	br	x2
 1:
 	ret
 endfunc reset_handler

 #endif /* IMAGE_BL1 || IMAGE_BL31 */

 #ifdef IMAGE_BL31 /* The power down core and cluster is needed only in  BL31 */
 	/*
 	 * void prepare_cpu_pwr_dwn(unsigned int power_level)
 	 *
 	 * Prepare CPU power down function for all platforms. The function takes
 	 * a domain level to be powered down as its parameter. After the cpu_ops
 	 * pointer is retrieved from cpu_data, the handler for requested power
 	 * level is called.
 	 */
 	.globl	prepare_cpu_pwr_dwn
 func prepare_cpu_pwr_dwn
 	/*
 	 * If the given power level exceeds CPU_MAX_PWR_DWN_OPS, we call the
 	 * power down handler for the last power level
 	 */
 	mov_imm	x2, (CPU_MAX_PWR_DWN_OPS - 1)
 	cmp	x0, x2
 	csel	x2, x2, x0, hi

 	mrs	x1, tpidr_el3
 	ldr	x0, [x1, #CPU_DATA_CPU_OPS_PTR]
 #if ENABLE_ASSERTIONS
 	cmp	x0, #0
 	ASM_ASSERT(ne)
 #endif

 	/* Get the appropriate power down handler */
 	mov	x1, #CPU_PWR_DWN_OPS
 	add	x1, x1, x2, lsl #3
 	ldr	x1, [x0, x1]
 	br	x1
 endfunc prepare_cpu_pwr_dwn


 	/*
 	 * Initializes the cpu_ops_ptr if not already initialized
 	 * in cpu_data. This can be called without a runtime stack, but may
 	 * only be called after the MMU is enabled.
 	 * clobbers: x0 - x6, x10
 	 */
 	.globl	init_cpu_ops
 func init_cpu_ops
 	mrs	x6, tpidr_el3
 	ldr	x0, [x6, #CPU_DATA_CPU_OPS_PTR]
 	cbnz	x0, 1f
 	mov	x10, x30
 	bl	get_cpu_ops_ptr
 #if ENABLE_ASSERTIONS
 	cmp	x0, #0
 	ASM_ASSERT(ne)
 #endif
 	str	x0, [x6, #CPU_DATA_CPU_OPS_PTR]!
 	mov x30, x10
 1:
 	ret
 endfunc init_cpu_ops
 #endif /* IMAGE_BL31 */

 #if defined(IMAGE_BL31) && CRASH_REPORTING
 	/*
 	 * The cpu specific registers which need to be reported in a crash
 	 * are reported via cpu_ops cpu_reg_dump function. After a matching
 	 * cpu_ops structure entry is found, the correponding cpu_reg_dump
 	 * in the cpu_ops is invoked.
 	 */
 	.globl	do_cpu_reg_dump
 func do_cpu_reg_dump
 	mov	x16, x30

 	/* Get the matching cpu_ops pointer */
 	bl	get_cpu_ops_ptr
 	cbz	x0, 1f

 	/* Get the cpu_ops cpu_reg_dump */
 	ldr	x2, [x0, #CPU_REG_DUMP]
 	cbz	x2, 1f
 	blr	x2
 1:
 	mov	x30, x16
 	ret
 endfunc do_cpu_reg_dump
 #endif

 	/*
 	 * The below function returns the cpu_ops structure matching the
 	 * midr of the core. It reads the MIDR_EL1 and finds the matching
 	 * entry in cpu_ops entries. Only the implementation and part number
 	 * are used to match the entries.
 	 * Return :
 	 *     x0 - The matching cpu_ops pointer on Success
 	 *     x0 - 0 on failure.
 	 * Clobbers : x0 - x5
 	 */
 	.globl	get_cpu_ops_ptr
 func get_cpu_ops_ptr
 	/* Get the cpu_ops start and end locations */
 	adr	x4, (__CPU_OPS_START__ + CPU_MIDR)
 	adr	x5, (__CPU_OPS_END__ + CPU_MIDR)

 	/* Initialize the return parameter */
 	mov	x0, #0

 	/* Read the MIDR_EL1 */
 	mrs	x2, midr_el1
 	mov_imm	x3, CPU_IMPL_PN_MASK

 	/* Retain only the implementation and part number using mask */
 	and	w2, w2, w3
 1:
 	/* Check if we have reached end of list */
 	cmp	x4, x5
 	b.eq	error_exit

 	/* load the midr from the cpu_ops */
 	ldr	x1, [x4], #CPU_OPS_SIZE
 	and	w1, w1, w3

 	/* Check if midr matches to midr of this core */
 	cmp	w1, w2
 	b.ne	1b

 	/* Subtract the increment and offset to get the cpu-ops pointer */
 	sub	x0, x4, #(CPU_OPS_SIZE + CPU_MIDR)
 error_exit:
 	ret
 endfunc get_cpu_ops_ptr

 /*
  * Extract CPU revision and variant, and combine them into a single numeric for
  * easier comparison.
  */
 	.globl	cpu_get_rev_var
 func cpu_get_rev_var
 	mrs	x1, midr_el1

 	/*
 	 * Extract the variant[23:20] and revision[3:0] from MIDR, and pack them
 	 * as variant[7:4] and revision[3:0] of x0.
 	 *
 	 * First extract x1[23:16] to x0[7:0] and zero fill the rest. Then
 	 * extract x1[3:0] into x0[3:0] retaining other bits.
 	 */
 	ubfx	x0, x1, #(MIDR_VAR_SHIFT - MIDR_REV_BITS), #(MIDR_REV_BITS + MIDR_VAR_BITS)
 	bfxil	x0, x1, #MIDR_REV_SHIFT, #MIDR_REV_BITS
 	ret
 endfunc cpu_get_rev_var

 /*
  * Compare the CPU's revision-variant (x0) with a given value (x1), for errata
  * application purposes. If the revision-variant is less than or same as a given
  * value, indicates that errata applies; otherwise not.
  */
 	.globl	cpu_rev_var_ls
 func cpu_rev_var_ls
 	mov	x2, #ERRATA_APPLIES
 	mov	x3, #ERRATA_NOT_APPLIES
 	cmp	x0, x1
 	csel	x0, x2, x3, ls
 	ret
 endfunc cpu_rev_var_ls

 /*
  * Compare the CPU's revision-variant (x0) with a given value (x1), for errata
  * application purposes. If the revision-variant is higher than or same as a
  * given value, indicates that errata applies; otherwise not.
  */
 	.globl	cpu_rev_var_hs
 func cpu_rev_var_hs
 	mov	x2, #ERRATA_APPLIES
 	mov	x3, #ERRATA_NOT_APPLIES
 	cmp	x0, x1
 	csel	x0, x2, x3, hs
 	ret
 endfunc cpu_rev_var_hs

 #if REPORT_ERRATA
 /*
  * void print_errata_status(void);
  *
  * Function to print errata status for CPUs of its class. Must be called only:
  *
  *   - with MMU and data caches are enabled;
  *   - after cpu_ops have been initialized in per-CPU data.
  */
 	.globl print_errata_status
 func print_errata_status
 #ifdef IMAGE_BL1
 	/*
 	 * BL1 doesn't have per-CPU data. So retrieve the CPU operations
 	 * directly.
 	 */
 	stp	xzr, x30, [sp, #-16]!
 	bl	get_cpu_ops_ptr
 	ldp	xzr, x30, [sp], #16
 	ldr	x1, [x0, #CPU_ERRATA_FUNC]
 	cbnz	x1, .Lprint
 #else
 	/*
 	 * Retrieve pointer to cpu_ops from per-CPU data, and further, the
 	 * errata printing function. If it's non-NULL, jump to the function in
 	 * turn.
 	 */
 	mrs	x0, tpidr_el3
 	ldr	x1, [x0, #CPU_DATA_CPU_OPS_PTR]
 	ldr	x0, [x1, #CPU_ERRATA_FUNC]
 	cbz	x0, .Lnoprint

 	/*
 	 * Printing errata status requires atomically testing the printed flag.
 	 */
 	stp	x8, x30, [sp, #-16]!
 	mov	x8, x0

 	/*
 	 * Load pointers to errata lock and printed flag. Call
 	 * errata_needs_reporting to check whether this CPU needs to report
 	 * errata status pertaining to its class.
 	 */
 	ldr	x0, [x1, #CPU_ERRATA_LOCK]
 	ldr	x1, [x1, #CPU_ERRATA_PRINTED]
 	bl	errata_needs_reporting
 	mov	x1, x8
 	ldp	x8, x30, [sp], #16
 	cbnz	x0, .Lprint
 #endif
 .Lnoprint:
 	ret
 .Lprint:
 	/* Jump to errata reporting function for this CPU */
 	br	x1
 endfunc print_errata_status
 #endif
	/*
	* Copyright (c) 2014-2017, ARM Limited and Contributors. All rights reserved.
	*
	* SPDX-License-Identifier: BSD-3-Clause
	*/

	#include <arch.h>
	#include <asm_macros.S>
	#include <assert_macros.S>
	#ifdef IMAGE_BL31
	#include <cpu_data.h>
	#endif
	#include <cpu_macros.S>
	#include <debug.h>
	#include <errata_report.h>

	/* Reset fn is needed in BL at reset vector */
	#if defined(IMAGE_BL1) \|\| defined(IMAGE_BL31)
	/*
	* The reset handler common to all platforms. After a matching
	* cpu_ops structure entry is found, the correponding reset_handler
	* in the cpu_ops is invoked.
	* Clobbers: x0 - x19, x30
	*/
	.globl reset_handler
	func reset_handler
	mov x19, x30

	/* The plat_reset_handler can clobber x0 - x18, x30 */
	bl plat_reset_handler

	/* Get the matching cpu_ops pointer */
	bl get_cpu_ops_ptr
	#if ENABLE_ASSERTIONS
	cmp x0, #0
	ASM_ASSERT(ne)
	#endif

	/* Get the cpu_ops reset handler */
	ldr x2, [x0, #CPU_RESET_FUNC]
	mov x30, x19
	cbz x2, 1f

	/* The cpu_ops reset handler can clobber x0 - x19, x30 */
	br x2
	1:
	ret
	endfunc reset_handler

	#endif /* IMAGE_BL1 \|\| IMAGE_BL31 */

	#ifdef IMAGE_BL31 /* The power down core and cluster is needed only in BL31 */
	/*
	* void prepare_cpu_pwr_dwn(unsigned int power_level)
	*
	* Prepare CPU power down function for all platforms. The function takes
	* a domain level to be powered down as its parameter. After the cpu_ops
	* pointer is retrieved from cpu_data, the handler for requested power
	* level is called.
	*/
	.globl prepare_cpu_pwr_dwn
	func prepare_cpu_pwr_dwn
	/*
	* If the given power level exceeds CPU_MAX_PWR_DWN_OPS, we call the
	* power down handler for the last power level
	*/
	mov_imm x2, (CPU_MAX_PWR_DWN_OPS - 1)
	cmp x0, x2
	csel x2, x2, x0, hi

	mrs x1, tpidr_el3
	ldr x0, [x1, #CPU_DATA_CPU_OPS_PTR]
	#if ENABLE_ASSERTIONS
	cmp x0, #0
	ASM_ASSERT(ne)
	#endif

	/* Get the appropriate power down handler */
	mov x1, #CPU_PWR_DWN_OPS
	add x1, x1, x2, lsl #3
	ldr x1, [x0, x1]
	br x1
	endfunc prepare_cpu_pwr_dwn


	/*
	* Initializes the cpu_ops_ptr if not already initialized
	* in cpu_data. This can be called without a runtime stack, but may
	* only be called after the MMU is enabled.
	* clobbers: x0 - x6, x10
	*/
	.globl init_cpu_ops
	func init_cpu_ops
	mrs x6, tpidr_el3
	ldr x0, [x6, #CPU_DATA_CPU_OPS_PTR]
	cbnz x0, 1f
	mov x10, x30
	bl get_cpu_ops_ptr
	#if ENABLE_ASSERTIONS
	cmp x0, #0
	ASM_ASSERT(ne)
	#endif
	str x0, [x6, #CPU_DATA_CPU_OPS_PTR]!
	mov x30, x10
	1:
	ret
	endfunc init_cpu_ops
	#endif /* IMAGE_BL31 */

	#if defined(IMAGE_BL31) && CRASH_REPORTING
	/*
	* The cpu specific registers which need to be reported in a crash
	* are reported via cpu_ops cpu_reg_dump function. After a matching
	* cpu_ops structure entry is found, the correponding cpu_reg_dump
	* in the cpu_ops is invoked.
	*/
	.globl do_cpu_reg_dump
	func do_cpu_reg_dump
	mov x16, x30

	/* Get the matching cpu_ops pointer */
	bl get_cpu_ops_ptr
	cbz x0, 1f

	/* Get the cpu_ops cpu_reg_dump */
	ldr x2, [x0, #CPU_REG_DUMP]
	cbz x2, 1f
	blr x2
	1:
	mov x30, x16
	ret
	endfunc do_cpu_reg_dump
	#endif

	/*
	* The below function returns the cpu_ops structure matching the
	* midr of the core. It reads the MIDR_EL1 and finds the matching
	* entry in cpu_ops entries. Only the implementation and part number
	* are used to match the entries.
	* Return :
	* x0 - The matching cpu_ops pointer on Success
	* x0 - 0 on failure.
	* Clobbers : x0 - x5
	*/
	.globl get_cpu_ops_ptr
	func get_cpu_ops_ptr
	/* Get the cpu_ops start and end locations */
	adr x4, (__CPU_OPS_START__ + CPU_MIDR)
	adr x5, (__CPU_OPS_END__ + CPU_MIDR)

	/* Initialize the return parameter */
	mov x0, #0

	/* Read the MIDR_EL1 */
	mrs x2, midr_el1
	mov_imm x3, CPU_IMPL_PN_MASK

	/* Retain only the implementation and part number using mask */
	and w2, w2, w3
	1:
	/* Check if we have reached end of list */
	cmp x4, x5
	b.eq error_exit

	/* load the midr from the cpu_ops */
	ldr x1, [x4], #CPU_OPS_SIZE
	and w1, w1, w3

	/* Check if midr matches to midr of this core */
	cmp w1, w2
	b.ne 1b

	/* Subtract the increment and offset to get the cpu-ops pointer */
	sub x0, x4, #(CPU_OPS_SIZE + CPU_MIDR)
	error_exit:
	ret
	endfunc get_cpu_ops_ptr

	/*
	* Extract CPU revision and variant, and combine them into a single numeric for
	* easier comparison.
	*/
	.globl cpu_get_rev_var
	func cpu_get_rev_var
	mrs x1, midr_el1

	/*
	* Extract the variant[23:20] and revision[3:0] from MIDR, and pack them
	* as variant[7:4] and revision[3:0] of x0.
	*
	* First extract x1[23:16] to x0[7:0] and zero fill the rest. Then
	* extract x1[3:0] into x0[3:0] retaining other bits.
	*/
	ubfx x0, x1, #(MIDR_VAR_SHIFT - MIDR_REV_BITS), #(MIDR_REV_BITS + MIDR_VAR_BITS)
	bfxil x0, x1, #MIDR_REV_SHIFT, #MIDR_REV_BITS
	ret
	endfunc cpu_get_rev_var

	/*
	* Compare the CPU's revision-variant (x0) with a given value (x1), for errata
	* application purposes. If the revision-variant is less than or same as a given
	* value, indicates that errata applies; otherwise not.
	*/
	.globl cpu_rev_var_ls
	func cpu_rev_var_ls
	mov x2, #ERRATA_APPLIES
	mov x3, #ERRATA_NOT_APPLIES
	cmp x0, x1
	csel x0, x2, x3, ls
	ret
	endfunc cpu_rev_var_ls

	/*
	* Compare the CPU's revision-variant (x0) with a given value (x1), for errata
	* application purposes. If the revision-variant is higher than or same as a
	* given value, indicates that errata applies; otherwise not.
	*/
	.globl cpu_rev_var_hs
	func cpu_rev_var_hs
	mov x2, #ERRATA_APPLIES
	mov x3, #ERRATA_NOT_APPLIES
	cmp x0, x1
	csel x0, x2, x3, hs
	ret
	endfunc cpu_rev_var_hs

	#if REPORT_ERRATA
	/*
	* void print_errata_status(void);
	*
	* Function to print errata status for CPUs of its class. Must be called only:
	*
	* - with MMU and data caches are enabled;
	* - after cpu_ops have been initialized in per-CPU data.
	*/
	.globl print_errata_status
	func print_errata_status
	#ifdef IMAGE_BL1
	/*
	* BL1 doesn't have per-CPU data. So retrieve the CPU operations
	* directly.
	*/
	stp xzr, x30, [sp, #-16]!
	bl get_cpu_ops_ptr
	ldp xzr, x30, [sp], #16
	ldr x1, [x0, #CPU_ERRATA_FUNC]
	cbnz x1, .Lprint
	#else
	/*
	* Retrieve pointer to cpu_ops from per-CPU data, and further, the
	* errata printing function. If it's non-NULL, jump to the function in
	* turn.
	*/
	mrs x0, tpidr_el3
	ldr x1, [x0, #CPU_DATA_CPU_OPS_PTR]
	ldr x0, [x1, #CPU_ERRATA_FUNC]
	cbz x0, .Lnoprint

	/*
	* Printing errata status requires atomically testing the printed flag.
	*/
	stp x8, x30, [sp, #-16]!
	mov x8, x0

	/*
	* Load pointers to errata lock and printed flag. Call
	* errata_needs_reporting to check whether this CPU needs to report
	* errata status pertaining to its class.
	*/
	ldr x0, [x1, #CPU_ERRATA_LOCK]
	ldr x1, [x1, #CPU_ERRATA_PRINTED]
	bl errata_needs_reporting
	mov x1, x8
	ldp x8, x30, [sp], #16
	cbnz x0, .Lprint
	#endif
	.Lnoprint:
	ret
	.Lprint:
	/* Jump to errata reporting function for this CPU */
	br x1
	endfunc print_errata_status
	#endif