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freebsd-dev/sys/arm64/include/pcpu.h

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Add the start of the arm64 machine headers. This is the subset needed to start getting userland libraries building. Reviewed by: imp Sponsored by: The FreeBSD Foundation
2015-03-23 11:54:56 +00:00
/*-
* Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: FreeBSD: src/sys/i386/include/globaldata.h,v 1.27 2001/04/27
* $FreeBSD$
*/
#ifndef _MACHINE_PCPU_H_
#define _MACHINE_PCPU_H_
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#define ALT_STACK_SIZE 128
Workaround Spectre Variant 2 on arm64. We need to handle two cases: 1. One process attacking another process. 2. A process attacking the kernel. For the first case we clear the branch predictor state on context switch between different processes. For the second we do this when taking an instruction abort on a non-userspace address. To clear the branch predictor state a per-CPU function pointer has been added. This is set by the new cpu errata code based on if the CPU is known to be affected. On Cortex-A57, A72, A73, and A75 we call into the PSCI firmware as newer versions of this will clear the branch predictor state for us. It has been reported the ThunderX is unaffected, however the ThunderX2 is vulnerable. The Qualcomm Falkor core is also affected. As FreeBSD doesn't yet run on the ThunderX2 or Falkor no workaround is included for these CPUs. MFC after: 3 days Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D13812
2018-01-12 14:01:38 +00:00
typedef int (*pcpu_bp_harden)(void);
Use int for the pcpu_ssbd argument. This is included from userland and may not include the needed headers to get the bool definition. Reported by: manu Pointy hat to: andrew Sponsored by: DARPA, AFRL
2018-07-31 15:08:02 +00:00
typedef int (*pcpu_ssbd)(int);
Update the debug monitor handling to work after userspace has started The debug monitor register state is now stored in a struct and updated when required. Currently there is only a kernel state, however a per-process state will be added in a future change. Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D22128
2019-10-30 10:51:24 +00:00
struct debug_monitor_state;
Workaround Spectre Variant 2 on arm64. We need to handle two cases: 1. One process attacking another process. 2. A process attacking the kernel. For the first case we clear the branch predictor state on context switch between different processes. For the second we do this when taking an instruction abort on a non-userspace address. To clear the branch predictor state a per-CPU function pointer has been added. This is set by the new cpu errata code based on if the CPU is known to be affected. On Cortex-A57, A72, A73, and A75 we call into the PSCI firmware as newer versions of this will clear the branch predictor state for us. It has been reported the ThunderX is unaffected, however the ThunderX2 is vulnerable. The Qualcomm Falkor core is also affected. As FreeBSD doesn't yet run on the ThunderX2 or Falkor no workaround is included for these CPUs. MFC after: 3 days Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D13812
2018-01-12 14:01:38 +00:00
Add the start of the arm64 machine headers. This is the subset needed to start getting userland libraries building. Reviewed by: imp Sponsored by: The FreeBSD Foundation
2015-03-23 11:54:56 +00:00
#define PCPU_MD_FIELDS \
Utilize ASIDs to reduce both the direct and indirect costs of context switching. The indirect costs being unnecessary TLB misses that are incurred when ASIDs are not used. In fact, currently, when we perform a context switch on one processor, we issue a broadcast TLB invalidation that flushes the TLB contents on every processor. Mark all user-space ("ttbr0") page table entries with the non-global flag so that they are cached in the TLB under their ASID. Correct an error in pmap_pinit0(). The pointer to the root of the page table was being initialized to the root of the kernel-space page table rather than a user-space page table. However, the root of the page table that was being cached in process 0's md_l0addr field correctly pointed to a user-space page table. As long as ASIDs weren't being used, this was harmless, except that it led to some unnecessary page table switches in pmap_switch(). Specifically, other kernel processes besides process 0 would have their md_l0addr field set to the root of the kernel-space page table, and so pmap_switch() would actually change page tables when switching between process 0 and other kernel processes. Implement a workaround for Cavium erratum 27456 affecting ThunderX machines. (I would like to thank andrew@ for providing the code to detect the affected machines.) Address integer overflow in the definition of TCR_ASID_16. Setup TCR according to the PARange and ASIDBits fields from ID_AA64MMFR0_EL1. Previously, TCR_ASID_16 was unconditionally set. Modify build_l1_block_pagetable so that lower attributes, such as ATTR_nG, can be specified as a parameter. Eliminate some unused code. Earlier versions were tested to varying degrees by: andrew, emaste, markj MFC after: 3 weeks Differential Revision: https://reviews.freebsd.org/D21922
2019-11-03 17:45:30 +00:00
u_int pc_acpi_id; /* ACPI CPU id */ \
u_int pc_midr; /* stored MIDR value */ \
Add a pc_clock pcpu field and use it to implement cpu_est_clockrate. This will allow drivers that manage the clock frequency to communicate this with the reset of the kernel. Reported by: jmcneill MFC after: 1 week Sponsored by: ABT Systems Ltd
2016-09-02 10:13:51 +00:00
uint64_t pc_clock; \
Workaround Spectre Variant 2 on arm64. We need to handle two cases: 1. One process attacking another process. 2. A process attacking the kernel. For the first case we clear the branch predictor state on context switch between different processes. For the second we do this when taking an instruction abort on a non-userspace address. To clear the branch predictor state a per-CPU function pointer has been added. This is set by the new cpu errata code based on if the CPU is known to be affected. On Cortex-A57, A72, A73, and A75 we call into the PSCI firmware as newer versions of this will clear the branch predictor state for us. It has been reported the ThunderX is unaffected, however the ThunderX2 is vulnerable. The Qualcomm Falkor core is also affected. As FreeBSD doesn't yet run on the ThunderX2 or Falkor no workaround is included for these CPUs. MFC after: 3 days Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D13812
2018-01-12 14:01:38 +00:00
pcpu_bp_harden pc_bp_harden; \
Implement the SSBD (CVE-2018-3639) workaround on arm64 This calls into the Arm Trusted Firmware to enable and disable the workaround for the Speculative Store Bypass Disable (SSBD) issue, also known as Spectre Variant 4. As this may have a large performance overhead, and how exploitable SSBD is is unknown we follow the Linux lead of allowing the administrator to select between always on, always off, or only enabled in the kernel, with the latter being the default. PR: 228955 Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D15819
2018-07-31 12:53:27 +00:00
pcpu_ssbd pc_ssbd; \
Utilize ASIDs to reduce both the direct and indirect costs of context switching. The indirect costs being unnecessary TLB misses that are incurred when ASIDs are not used. In fact, currently, when we perform a context switch on one processor, we issue a broadcast TLB invalidation that flushes the TLB contents on every processor. Mark all user-space ("ttbr0") page table entries with the non-global flag so that they are cached in the TLB under their ASID. Correct an error in pmap_pinit0(). The pointer to the root of the page table was being initialized to the root of the kernel-space page table rather than a user-space page table. However, the root of the page table that was being cached in process 0's md_l0addr field correctly pointed to a user-space page table. As long as ASIDs weren't being used, this was harmless, except that it led to some unnecessary page table switches in pmap_switch(). Specifically, other kernel processes besides process 0 would have their md_l0addr field set to the root of the kernel-space page table, and so pmap_switch() would actually change page tables when switching between process 0 and other kernel processes. Implement a workaround for Cavium erratum 27456 affecting ThunderX machines. (I would like to thank andrew@ for providing the code to detect the affected machines.) Address integer overflow in the definition of TCR_ASID_16. Setup TCR according to the PARange and ASIDBits fields from ID_AA64MMFR0_EL1. Previously, TCR_ASID_16 was unconditionally set. Modify build_l1_block_pagetable so that lower attributes, such as ATTR_nG, can be specified as a parameter. Eliminate some unused code. Earlier versions were tested to varying degrees by: andrew, emaste, markj MFC after: 3 weeks Differential Revision: https://reviews.freebsd.org/D21922
2019-11-03 17:45:30 +00:00
struct pmap *pc_curpmap; \
u_int pc_bcast_tlbi_workaround; \
char __pad[213]
Add the start of the arm64 machine headers. This is the subset needed to start getting userland libraries building. Reviewed by: imp Sponsored by: The FreeBSD Foundation
2015-03-23 11:54:56 +00:00
#ifdef _KERNEL
struct pcb;
struct pcpu;
static inline struct pcpu *
get_pcpu(void)
{
struct pcpu *pcpu;
__asm __volatile("mov %0, x18" : "=&r"(pcpu));
return (pcpu);
}
static inline struct thread *
get_curthread(void)
{
struct thread *td;
__asm __volatile("ldr %0, [x18]" : "=&r"(td));
return (td);
}
#define curthread get_curthread()
#define PCPU_GET(member) (get_pcpu()->pc_ ## member)
#define PCPU_ADD(member, value) (get_pcpu()->pc_ ## member += (value))
#define PCPU_INC(member) PCPU_ADD(member, 1)
#define PCPU_PTR(member) (&get_pcpu()->pc_ ## member)
#define PCPU_SET(member,value) (get_pcpu()->pc_ ## member = (value))
#endif /* _KERNEL */
#endif /* !_MACHINE_PCPU_H_ */
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