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ark1668ed-bsp
/
linux
/
arch
/
riscv
/
include
/
asm
/
assembler.h

assembler.h 2.2 KB
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  1. /* SPDX-License-Identifier: GPL-2.0-only */
    2. 

  2. /*
    3. 

  3.  * Copyright (C) 2023 StarFive Technology Co., Ltd.
    4. 

  4.  *
    5. 

  5.  * Author: Jee Heng Sia <jeeheng.sia@starfivetech.com>
    6. 

  6.  */
    7. 

  7. 

  8. #ifndef __ASSEMBLY__
    9. 

  9. #error "Only include this from assembly code"
    10. 

  10. #endif
    11. 

  11. 

  12. #ifndef __ASM_ASSEMBLER_H
    13. 

  13. #define __ASM_ASSEMBLER_H
    14. 

  14. 

  15. #include <asm/asm.h>
    16. 

  16. #include <asm/asm-offsets.h>
    17. 

  17. #include <asm/csr.h>
    18. 

  18. 

  19. /*
    20. 

  20.  * suspend_restore_csrs - restore CSRs
    21. 

  21.  */
    22. 

  22. 	.macro suspend_restore_csrs
    23. 

  23. 		REG_L	t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0)
    24. 

  24. 		csrw	CSR_EPC, t0
    25. 

  25. 		REG_L	t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0)
    26. 

  26. 		csrw	CSR_STATUS, t0
    27. 

  27. 		REG_L	t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0)
    28. 

  28. 		csrw	CSR_TVAL, t0
    29. 

  29. 		REG_L	t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0)
    30. 

  30. 		csrw	CSR_CAUSE, t0
    31. 

  31. 	.endm
    32. 

  32. 

  33. /*
    34. 

  34.  * suspend_restore_regs - Restore registers (except A0 and T0-T6)
    35. 

  35.  */
    36. 

  36. 	.macro suspend_restore_regs
    37. 

  37. 		REG_L	ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0)
    38. 

  38. 		REG_L	sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0)
    39. 

  39. 		REG_L	gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0)
    40. 

  40. 		REG_L	tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0)
    41. 

  41. 		REG_L	s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0)
    42. 

  42. 		REG_L	s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0)
    43. 

  43. 		REG_L	a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0)
    44. 

  44. 		REG_L	a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0)
    45. 

  45. 		REG_L	a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0)
    46. 

  46. 		REG_L	a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0)
    47. 

  47. 		REG_L	a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0)
    48. 

  48. 		REG_L	a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0)
    49. 

  49. 		REG_L	a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0)
    50. 

  50. 		REG_L	s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0)
    51. 

  51. 		REG_L	s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0)
    52. 

  52. 		REG_L	s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0)
    53. 

  53. 		REG_L	s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0)
    54. 

  54. 		REG_L	s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0)
    55. 

  55. 		REG_L	s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0)
    56. 

  56. 		REG_L	s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0)
    57. 

  57. 		REG_L	s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0)
    58. 

  58. 		REG_L	s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0)
    59. 

  59. 		REG_L	s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0)
    60. 

  60. 	.endm
    61. 

  61. 

  62. /*
    63. 

  63.  * copy_page - copy 1 page (4KB) of data from source to destination
    64. 

  64.  * @a0 - destination
    65. 

  65.  * @a1 - source
    66. 

  66.  */
    67. 

  67. 	.macro	copy_page a0, a1
    68. 

  68. 		lui	a2, 0x1
    69. 

  69. 		add	a2, a2, a0
    70. 

  70. 1 :
    71. 

  71. 		REG_L	t0, 0(a1)
    72. 

  72. 		REG_L	t1, SZREG(a1)
    73. 

  73. 

  74. 		REG_S	t0, 0(a0)
    75. 

  75. 		REG_S	t1, SZREG(a0)
    76. 

  76. 

  77. 		addi	a0, a0, 2 * SZREG
    78. 

  78. 		addi	a1, a1, 2 * SZREG
    79. 

  79. 		bne	a2, a0, 1b
    80. 

  80. 	.endm
    81. 

  81. 

  82. #endif	/* __ASM_ASSEMBLER_H */
    83.