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c031721001
Low level Arch functions were created to support hibernation. swsusp_arch_suspend() relies code from __cpu_suspend_enter() to write cpu state onto the stack, then calling swsusp_save() to save the memory image. Arch specific hibernation header is implemented and is utilized by the arch_hibernation_header_restore() and arch_hibernation_header_save() functions. The arch specific hibernation header consists of satp, hartid, and the cpu_resume address. The kernel built version is also need to be saved into the hibernation image header to making sure only the same kernel is restore when resume. swsusp_arch_resume() creates a temporary page table that covering only the linear map. It copies the restore code to a 'safe' page, then start to restore the memory image. Once completed, it restores the original kernel's page table. It then calls into __hibernate_cpu_resume() to restore the CPU context. Finally, it follows the normal hibernation path back to the hibernation core. To enable hibernation/suspend to disk into RISCV, the below config need to be enabled: - CONFIG_HIBERNATION - CONFIG_ARCH_HIBERNATION_HEADER - CONFIG_ARCH_HIBERNATION_POSSIBLE Signed-off-by: Sia Jee Heng <jeeheng.sia@starfivetech.com> Reviewed-by: Ley Foon Tan <leyfoon.tan@starfivetech.com> Reviewed-by: Mason Huo <mason.huo@starfivetech.com> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Link: https://lore.kernel.org/r/20230330064321.1008373-5-jeeheng.sia@starfivetech.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2023 StarFive Technology Co., Ltd.
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*
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* Author: Jee Heng Sia <jeeheng.sia@starfivetech.com>
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*/
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#ifndef __ASSEMBLY__
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#error "Only include this from assembly code"
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#endif
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#ifndef __ASM_ASSEMBLER_H
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#define __ASM_ASSEMBLER_H
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#include <asm/asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/csr.h>
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/*
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* suspend_restore_csrs - restore CSRs
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*/
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.macro suspend_restore_csrs
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REG_L t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0)
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csrw CSR_EPC, t0
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REG_L t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0)
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csrw CSR_STATUS, t0
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REG_L t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0)
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csrw CSR_TVAL, t0
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REG_L t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0)
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csrw CSR_CAUSE, t0
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.endm
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/*
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* suspend_restore_regs - Restore registers (except A0 and T0-T6)
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*/
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.macro suspend_restore_regs
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REG_L ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0)
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REG_L sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0)
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REG_L gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0)
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REG_L tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0)
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REG_L s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0)
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REG_L s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0)
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REG_L a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0)
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REG_L a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0)
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REG_L a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0)
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REG_L a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0)
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REG_L a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0)
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REG_L a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0)
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REG_L a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0)
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REG_L s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0)
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REG_L s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0)
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REG_L s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0)
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REG_L s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0)
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REG_L s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0)
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REG_L s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0)
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REG_L s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0)
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REG_L s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0)
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REG_L s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0)
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REG_L s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0)
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.endm
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/*
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* copy_page - copy 1 page (4KB) of data from source to destination
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* @a0 - destination
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* @a1 - source
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*/
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.macro copy_page a0, a1
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lui a2, 0x1
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add a2, a2, a0
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1 :
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REG_L t0, 0(a1)
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REG_L t1, SZREG(a1)
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REG_S t0, 0(a0)
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REG_S t1, SZREG(a0)
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addi a0, a0, 2 * SZREG
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addi a1, a1, 2 * SZREG
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bne a2, a0, 1b
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.endm
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#endif /* __ASM_ASSEMBLER_H */
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