From: geoff@infradead.org (Geoff Levand) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v12 05/16] arm64: Add back cpu_reset routines Date: Tue, 24 Nov 2015 22:25:33 +0000 [thread overview] Message-ID: <3279584774ba40f088b79f4df864d69a5b57b516.1448403503.git.geoff@infradead.org> (raw) In-Reply-To: <cover.1448403503.git.geoff@infradead.org> Commit 68234df4ea7939f98431aa81113fbdce10c4a84b (arm64: kill flush_cache_all()) removed the global arm64 routines cpu_reset() and cpu_soft_restart() needed by the arm64 kexec and kdump support. Add simplified versions of those two routines back with some changes needed for kexec in the new files cpu_reset.S, and cpu_reset.h. When a CPU is reset it needs to be put into the exception level it had when it entered the kernel. Update cpu_reset() to accept an argument which signals if the reset address needs to be entered at EL1 or EL2. Signed-off-by: Geoff Levand <geoff@infradead.org> --- arch/arm64/kernel/cpu-reset.S | 84 +++++++++++++++++++++++++++++++++++++++++++ arch/arm64/kernel/cpu-reset.h | 22 ++++++++++++ 2 files changed, 106 insertions(+) create mode 100644 arch/arm64/kernel/cpu-reset.S create mode 100644 arch/arm64/kernel/cpu-reset.h diff --git a/arch/arm64/kernel/cpu-reset.S b/arch/arm64/kernel/cpu-reset.S new file mode 100644 index 0000000..0423f27 --- /dev/null +++ b/arch/arm64/kernel/cpu-reset.S @@ -0,0 +1,84 @@ +/* + * cpu reset routines + * + * Copyright (C) 2001 Deep Blue Solutions Ltd. + * Copyright (C) 2012 ARM Ltd. + * Copyright (C) 2015 Huawei Futurewei Technologies. + * + * 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. + */ + +#include <linux/linkage.h> +#include <asm/assembler.h> +#include <asm/virt.h> + +#define SCTLR_ELx_I (1 << 12) +#define SCTLR_ELx_SA (1 << 3) +#define SCTLR_ELx_C (1 << 2) +#define SCTLR_ELx_A (1 << 1) +#define SCTLR_ELx_M 1 +#define SCTLR_ELx_FLAGS (SCTLR_ELx_M | SCTLR_ELx_A | SCTLR_ELx_C | \ + SCTLR_ELx_SA | SCTLR_ELx_I) + +.text +.pushsection .idmap.text, "ax" + +.align 5 + +/* + * cpu_soft_restart(cpu_reset, el2_switch, entry, arg0, arg1) - Perform a cpu + * soft reset. + * + * @cpu_reset: Physical address of the cpu_reset routine. + * @el2_switch: Flag to indicate a swich to EL2 is needed, passed to cpu_reset. + * @entry: Location to jump to for soft reset, passed to cpu_reset. + * arg0: First argument passed to @entry. + * arg1: Second argument passed to @entry. + */ + +ENTRY(cpu_soft_restart) + mov x18, x0 // cpu_reset + mov x0, x1 // el2_switch + mov x1, x2 // entry + mov x2, x3 // arg0 + mov x3, x4 // arg1 + ret x18 +ENDPROC(cpu_soft_restart) + +/* + * cpu_reset(el2_switch, entry, arg0, arg1) - Helper for cpu_soft_restart. + * + * @el2_switch: Flag to indicate a swich to EL2 is needed. + * @entry: Location to jump to for soft reset. + * arg0: First argument passed to @entry. + * arg1: Second argument passed to @entry. + * + * Put the CPU into the same state as it would be if it had been reset, and + * branch to what would be the reset vector. It must be executed with the + * flat identity mapping. + */ + +ENTRY(cpu_reset) + /* Clear sctlr_el1 flags. */ + mrs x12, sctlr_el1 + ldr x13, =SCTLR_ELx_FLAGS + bic x12, x12, x13 + msr sctlr_el1, x12 + isb + + cbz x0, 1f // el2_switch? + + mov x0, x1 // entry + mov x1, x2 // arg0 + mov x2, x3 // arg1 + hvc #HVC_CALL_FUNC // no return + +1: mov x18, x1 // entry + mov x0, x2 // arg0 + mov x1, x3 // arg1 + ret x18 +ENDPROC(cpu_reset) + +.popsection diff --git a/arch/arm64/kernel/cpu-reset.h b/arch/arm64/kernel/cpu-reset.h new file mode 100644 index 0000000..79816b6 --- /dev/null +++ b/arch/arm64/kernel/cpu-reset.h @@ -0,0 +1,22 @@ +/* + * cpu reset routines + * + * Copyright (C) 2015 Huawei Futurewei Technologies. + * + * 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. + */ + +#if !defined(_ARM64_CPU_RESET_H) +#define _ARM64_CPU_RESET_H + +#include <asm/virt.h> + +void __attribute__((noreturn)) cpu_reset(unsigned long el2_switch, + unsigned long entry, unsigned long arg0, unsigned long arg1); +void __attribute__((noreturn)) cpu_soft_restart(phys_addr_t cpu_reset, + unsigned long el2_switch, unsigned long entry, unsigned long arg0, + unsigned long arg1); + +#endif -- 2.5.0
WARNING: multiple messages have this Message-ID (diff)
From: Geoff Levand <geoff@infradead.org> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com> Cc: Mark Rutland <mark.rutland@arm.com>, marc.zyngier@arm.com, kexec@lists.infradead.org, AKASHI Takahiro <takahiro.akashi@linaro.org>, christoffer.dall@linaro.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v12 05/16] arm64: Add back cpu_reset routines Date: Tue, 24 Nov 2015 22:25:33 +0000 [thread overview] Message-ID: <3279584774ba40f088b79f4df864d69a5b57b516.1448403503.git.geoff@infradead.org> (raw) In-Reply-To: <cover.1448403503.git.geoff@infradead.org> Commit 68234df4ea7939f98431aa81113fbdce10c4a84b (arm64: kill flush_cache_all()) removed the global arm64 routines cpu_reset() and cpu_soft_restart() needed by the arm64 kexec and kdump support. Add simplified versions of those two routines back with some changes needed for kexec in the new files cpu_reset.S, and cpu_reset.h. When a CPU is reset it needs to be put into the exception level it had when it entered the kernel. Update cpu_reset() to accept an argument which signals if the reset address needs to be entered at EL1 or EL2. Signed-off-by: Geoff Levand <geoff@infradead.org> --- arch/arm64/kernel/cpu-reset.S | 84 +++++++++++++++++++++++++++++++++++++++++++ arch/arm64/kernel/cpu-reset.h | 22 ++++++++++++ 2 files changed, 106 insertions(+) create mode 100644 arch/arm64/kernel/cpu-reset.S create mode 100644 arch/arm64/kernel/cpu-reset.h diff --git a/arch/arm64/kernel/cpu-reset.S b/arch/arm64/kernel/cpu-reset.S new file mode 100644 index 0000000..0423f27 --- /dev/null +++ b/arch/arm64/kernel/cpu-reset.S @@ -0,0 +1,84 @@ +/* + * cpu reset routines + * + * Copyright (C) 2001 Deep Blue Solutions Ltd. + * Copyright (C) 2012 ARM Ltd. + * Copyright (C) 2015 Huawei Futurewei Technologies. + * + * 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. + */ + +#include <linux/linkage.h> +#include <asm/assembler.h> +#include <asm/virt.h> + +#define SCTLR_ELx_I (1 << 12) +#define SCTLR_ELx_SA (1 << 3) +#define SCTLR_ELx_C (1 << 2) +#define SCTLR_ELx_A (1 << 1) +#define SCTLR_ELx_M 1 +#define SCTLR_ELx_FLAGS (SCTLR_ELx_M | SCTLR_ELx_A | SCTLR_ELx_C | \ + SCTLR_ELx_SA | SCTLR_ELx_I) + +.text +.pushsection .idmap.text, "ax" + +.align 5 + +/* + * cpu_soft_restart(cpu_reset, el2_switch, entry, arg0, arg1) - Perform a cpu + * soft reset. + * + * @cpu_reset: Physical address of the cpu_reset routine. + * @el2_switch: Flag to indicate a swich to EL2 is needed, passed to cpu_reset. + * @entry: Location to jump to for soft reset, passed to cpu_reset. + * arg0: First argument passed to @entry. + * arg1: Second argument passed to @entry. + */ + +ENTRY(cpu_soft_restart) + mov x18, x0 // cpu_reset + mov x0, x1 // el2_switch + mov x1, x2 // entry + mov x2, x3 // arg0 + mov x3, x4 // arg1 + ret x18 +ENDPROC(cpu_soft_restart) + +/* + * cpu_reset(el2_switch, entry, arg0, arg1) - Helper for cpu_soft_restart. + * + * @el2_switch: Flag to indicate a swich to EL2 is needed. + * @entry: Location to jump to for soft reset. + * arg0: First argument passed to @entry. + * arg1: Second argument passed to @entry. + * + * Put the CPU into the same state as it would be if it had been reset, and + * branch to what would be the reset vector. It must be executed with the + * flat identity mapping. + */ + +ENTRY(cpu_reset) + /* Clear sctlr_el1 flags. */ + mrs x12, sctlr_el1 + ldr x13, =SCTLR_ELx_FLAGS + bic x12, x12, x13 + msr sctlr_el1, x12 + isb + + cbz x0, 1f // el2_switch? + + mov x0, x1 // entry + mov x1, x2 // arg0 + mov x2, x3 // arg1 + hvc #HVC_CALL_FUNC // no return + +1: mov x18, x1 // entry + mov x0, x2 // arg0 + mov x1, x3 // arg1 + ret x18 +ENDPROC(cpu_reset) + +.popsection diff --git a/arch/arm64/kernel/cpu-reset.h b/arch/arm64/kernel/cpu-reset.h new file mode 100644 index 0000000..79816b6 --- /dev/null +++ b/arch/arm64/kernel/cpu-reset.h @@ -0,0 +1,22 @@ +/* + * cpu reset routines + * + * Copyright (C) 2015 Huawei Futurewei Technologies. + * + * 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. + */ + +#if !defined(_ARM64_CPU_RESET_H) +#define _ARM64_CPU_RESET_H + +#include <asm/virt.h> + +void __attribute__((noreturn)) cpu_reset(unsigned long el2_switch, + unsigned long entry, unsigned long arg0, unsigned long arg1); +void __attribute__((noreturn)) cpu_soft_restart(phys_addr_t cpu_reset, + unsigned long el2_switch, unsigned long entry, unsigned long arg0, + unsigned long arg1); + +#endif -- 2.5.0 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
next prev parent reply other threads:[~2015-11-24 22:25 UTC|newest] Thread overview: 178+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-11-24 22:25 [PATCH v12 00/16] arm64 kexec kernel patches v12 Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-11-24 22:25 ` [PATCH v12 06/16] Revert "arm64: mm: remove unused cpu_set_idmap_tcr_t0sz function" Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-11-24 22:25 ` [PATCH v12 04/16] arm64: kvm: allows kvm cpu hotplug Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-11-27 13:54 ` Marc Zyngier 2015-11-27 13:54 ` Marc Zyngier 2015-12-02 22:40 ` Ashwin Chaugule 2015-12-02 22:40 ` Ashwin Chaugule 2015-12-03 13:55 ` Ashwin Chaugule 2015-12-03 13:55 ` Ashwin Chaugule 2015-12-03 13:58 ` Marc Zyngier 2015-12-03 13:58 ` Marc Zyngier 2015-12-10 18:31 ` Geoff Levand 2015-12-10 18:31 ` Geoff Levand 2015-12-11 16:31 ` Will Deacon 2015-12-11 16:31 ` Will Deacon 2015-12-15 8:48 ` AKASHI Takahiro 2015-12-15 8:48 ` AKASHI Takahiro 2015-12-10 18:44 ` Shi, Yang 2015-12-10 18:44 ` Shi, Yang 2015-12-11 8:09 ` AKASHI Takahiro 2015-12-11 8:09 ` AKASHI Takahiro 2015-12-14 18:00 ` Shi, Yang 2015-12-14 18:00 ` Shi, Yang 2015-12-11 8:06 ` AKASHI Takahiro 2015-12-11 8:06 ` AKASHI Takahiro 2015-12-11 13:00 ` Shanker Donthineni 2015-12-11 13:00 ` Shanker Donthineni 2015-12-11 16:28 ` Marc Zyngier 2015-12-11 16:28 ` Marc Zyngier 2015-12-11 18:00 ` Shanker Donthineni 2015-12-11 18:00 ` Shanker Donthineni 2015-12-11 18:11 ` Marc Zyngier 2015-12-11 18:11 ` Marc Zyngier 2015-12-11 19:11 ` Shanker Donthineni 2015-12-11 19:11 ` Shanker Donthineni 2015-12-11 20:13 ` Ashwin Chaugule 2015-12-11 20:13 ` Ashwin Chaugule 2015-12-14 7:33 ` AKASHI Takahiro 2015-12-14 7:33 ` AKASHI Takahiro 2015-12-14 17:33 ` Marc Zyngier 2015-12-14 17:33 ` Marc Zyngier 2015-12-15 7:51 ` AKASHI Takahiro 2015-12-15 7:51 ` AKASHI Takahiro 2015-12-15 8:45 ` Marc Zyngier 2015-12-15 8:45 ` Marc Zyngier 2015-12-15 9:51 ` AKASHI Takahiro 2015-12-15 9:51 ` AKASHI Takahiro 2015-12-15 10:13 ` Marc Zyngier 2015-12-15 10:13 ` Marc Zyngier 2015-11-24 22:25 ` [PATCH v12 02/16] arm64: Convert hcalls to use HVC immediate value Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-11-24 22:25 ` [PATCH v12 03/16] arm64: Add new hcall HVC_CALL_FUNC Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-11-24 22:25 ` [PATCH v12 01/16] arm64: Fold proc-macros.S into assembler.h Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-11-24 22:25 ` Geoff Levand [this message] 2015-11-24 22:25 ` [PATCH v12 05/16] arm64: Add back cpu_reset routines Geoff Levand 2015-11-27 14:19 ` Marc Zyngier 2015-11-27 14:19 ` Marc Zyngier 2015-11-30 5:28 ` Pratyush Anand 2015-11-30 5:28 ` Pratyush Anand 2015-11-30 10:40 ` Marc Zyngier 2015-11-30 10:40 ` Marc Zyngier 2015-12-02 22:57 ` Geoff Levand 2015-12-02 22:57 ` Geoff Levand 2015-12-03 9:32 ` Will Deacon 2015-12-03 9:32 ` Will Deacon 2015-12-10 0:49 ` Geoff Levand 2015-12-10 0:49 ` Geoff Levand 2015-12-10 10:17 ` Will Deacon 2015-12-10 10:17 ` Will Deacon 2015-11-30 20:03 ` Geoff Levand 2015-11-30 20:03 ` Geoff Levand 2015-12-01 9:38 ` Marc Zyngier 2015-12-01 9:38 ` Marc Zyngier 2015-11-24 22:25 ` [PATCH v12 07/16] Revert "arm64: remove dead code" Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-11-24 22:25 ` [PATCH v12 16/16] arm64: kdump: relax BUG_ON() if more than one cpus are still active Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-12-15 17:05 ` Will Deacon 2015-12-15 17:05 ` Will Deacon 2015-12-16 5:51 ` AKASHI Takahiro 2015-12-16 5:51 ` AKASHI Takahiro 2015-11-24 22:25 ` [PATCH v12 11/16] arm64: kdump: reserve memory for crash dump kernel Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-12-15 17:29 ` Will Deacon 2015-12-15 17:29 ` Will Deacon 2015-12-16 5:19 ` AKASHI Takahiro 2015-12-16 5:19 ` AKASHI Takahiro 2015-12-16 7:36 ` Pratyush Anand 2015-12-16 7:36 ` Pratyush Anand 2015-11-24 22:25 ` [PATCH v12 15/16] arm64: kdump: enable kdump in the arm64 defconfig Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-11-24 22:25 ` [PATCH v12 09/16] arm64/kexec: Add pr_devel output Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-12-15 17:15 ` Will Deacon 2015-12-15 17:15 ` Will Deacon 2015-12-16 0:45 ` Geoff Levand 2015-12-16 0:45 ` Geoff Levand 2015-12-16 0:46 ` [PATCH v12.4] arm64/kexec: Add pr_debug output Geoff Levand 2015-12-16 0:46 ` Geoff Levand 2015-11-24 22:25 ` [PATCH v12 12/16] arm64: kdump: implement machine_crash_shutdown() Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-11-27 14:39 ` Marc Zyngier 2015-11-27 14:39 ` Marc Zyngier 2015-12-10 11:34 ` AKASHI Takahiro 2015-12-10 11:34 ` AKASHI Takahiro 2015-12-10 11:44 ` Marc Zyngier 2015-12-10 11:44 ` Marc Zyngier 2015-12-10 12:55 ` AKASHI Takahiro 2015-12-10 12:55 ` AKASHI Takahiro 2015-12-10 13:43 ` Marc Zyngier 2015-12-10 13:43 ` Marc Zyngier 2015-12-03 4:15 ` Pratyush Anand 2015-12-03 4:15 ` Pratyush Anand 2015-12-10 11:42 ` AKASHI Takahiro 2015-12-10 11:42 ` AKASHI Takahiro 2015-12-10 11:50 ` Pratyush Anand 2015-12-10 11:50 ` Pratyush Anand 2015-11-24 22:25 ` [PATCH v12 14/16] arm64: kdump: update a kernel doc Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-12-15 17:17 ` Will Deacon 2015-12-15 17:17 ` Will Deacon 2015-12-16 5:48 ` AKASHI Takahiro 2015-12-16 5:48 ` AKASHI Takahiro 2015-11-24 22:25 ` [PATCH v12 10/16] arm64/kexec: Enable kexec in the arm64 defconfig Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-11-24 22:25 ` [PATCH v12 13/16] arm64: kdump: add kdump support Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-12-15 17:45 ` Will Deacon 2015-12-15 17:45 ` Will Deacon 2015-12-16 5:41 ` AKASHI Takahiro 2015-12-16 5:41 ` AKASHI Takahiro 2015-11-24 22:25 ` [PATCH v12 08/16] arm64/kexec: Add core kexec support Geoff Levand 2015-11-24 22:25 ` Geoff Levand 2015-11-27 13:13 ` Pratyush Anand 2015-11-27 13:13 ` Pratyush Anand 2015-11-30 18:51 ` Geoff Levand 2015-11-30 18:51 ` Geoff Levand 2015-12-01 2:16 ` Pratyush Anand 2015-12-01 2:16 ` Pratyush Anand 2015-12-01 18:32 ` Azriel Samson 2015-12-01 18:32 ` Azriel Samson 2015-12-02 22:49 ` Geoff Levand 2015-12-02 22:49 ` Geoff Levand 2015-12-03 4:37 ` Azriel Samson 2015-12-03 4:37 ` Azriel Samson 2015-12-03 19:56 ` Geoff Levand 2015-12-03 19:56 ` Geoff Levand 2015-12-04 0:39 ` Azriel Samson 2015-12-04 0:39 ` Azriel Samson 2015-12-04 3:54 ` Pratyush Anand 2015-12-04 3:54 ` Pratyush Anand 2015-12-07 18:47 ` Geoff Levand 2015-12-07 18:47 ` Geoff Levand 2015-12-03 6:09 ` Pratyush Anand 2015-12-03 6:09 ` Pratyush Anand 2015-12-01 19:03 ` Mark Rutland 2015-12-01 19:03 ` Mark Rutland 2015-12-02 21:08 ` Geoff Levand 2015-12-02 21:08 ` Geoff Levand 2015-12-03 16:06 ` Mark Rutland 2015-12-03 16:06 ` Mark Rutland 2015-12-15 18:29 ` Will Deacon 2015-12-15 18:29 ` Will Deacon 2015-12-16 0:14 ` Geoff Levand 2015-12-16 0:14 ` Geoff Levand 2015-12-16 7:18 ` Pratyush Anand 2015-12-16 7:18 ` Pratyush Anand 2015-12-16 9:30 ` James Morse 2015-12-16 9:30 ` James Morse 2015-12-16 10:32 ` Pratyush Anand 2015-12-16 10:32 ` Pratyush Anand 2015-12-16 0:14 ` [PATCH v12.4] " Geoff Levand 2015-12-16 0:14 ` Geoff Levand
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