arch/riscv/include/asm/assembler.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2023 StarFive Technology Co., Ltd.
   4  *
   5  * Author: Jee Heng Sia <jeeheng.sia@starfivetech.com>
   6  */
   7
   8 #ifndef __ASSEMBLY__
   9 #error "Only include this from assembly code"
  10 #endif
  11
  12 #ifndef __ASM_ASSEMBLER_H
  13 #define __ASM_ASSEMBLER_H
  14
  15 #include <asm/asm.h>
  16 #include <asm/asm-offsets.h>
  17 #include <asm/csr.h>
  18
  19 /*
  20  * suspend_restore_csrs - restore CSRs
  21  */
  22         .macro suspend_restore_csrs
  23                 REG_L   t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0)
  24                 csrw    CSR_EPC, t0
  25                 REG_L   t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0)
  26                 csrw    CSR_STATUS, t0
  27                 REG_L   t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0)
  28                 csrw    CSR_TVAL, t0
  29                 REG_L   t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0)
  30                 csrw    CSR_CAUSE, t0
  31         .endm
  32
  33 /*
  34  * suspend_restore_regs - Restore registers (except A0 and T0-T6)
  35  */
  36         .macro suspend_restore_regs
  37                 REG_L   ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0)
  38                 REG_L   sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0)
  39                 REG_L   gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0)
  40                 REG_L   tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0)
  41                 REG_L   s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0)
  42                 REG_L   s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0)
  43                 REG_L   a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0)
  44                 REG_L   a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0)
  45                 REG_L   a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0)
  46                 REG_L   a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0)
  47                 REG_L   a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0)
  48                 REG_L   a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0)
  49                 REG_L   a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0)
  50                 REG_L   s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0)
  51                 REG_L   s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0)
  52                 REG_L   s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0)
  53                 REG_L   s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0)
  54                 REG_L   s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0)
  55                 REG_L   s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0)
  56                 REG_L   s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0)
  57                 REG_L   s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0)
  58                 REG_L   s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0)
  59                 REG_L   s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0)
  60         .endm
  61
  62 /*
  63  * copy_page - copy 1 page (4KB) of data from source to destination
  64  * @a0 - destination
  65  * @a1 - source
  66  */
  67         .macro  copy_page a0, a1
  68                 lui     a2, 0x1
  69                 add     a2, a2, a0
  70 1 :
  71                 REG_L   t0, 0(a1)
  72                 REG_L   t1, SZREG(a1)
  73
  74                 REG_S   t0, 0(a0)
  75                 REG_S   t1, SZREG(a0)
  76
  77                 addi    a0, a0, 2 * SZREG
  78                 addi    a1, a1, 2 * SZREG
  79                 bne     a2, a0, 1b
  80         .endm
  81
  82 #endif  /* __ASM_ASSEMBLER_H */