Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sparc/mm/srmmu_access.S
26424 views
1
/* SPDX-License-Identifier: GPL-2.0 */

2
/* Assembler variants of srmmu access functions.

3
 * Implemented in assembler to allow run-time patching.

4
 * LEON uses a different ASI for MMUREGS than SUN.

5
 *

6
 * The leon_1insn_patch infrastructure is used

7
 * for the run-time patching.

8
 */

9


10
#include <linux/linkage.h>

11


12
#include <asm/asmmacro.h>

13
#include <asm/pgtsrmmu.h>

14
#include <asm/asi.h>

15


16
/* unsigned int srmmu_get_mmureg(void) */

17
ENTRY(srmmu_get_mmureg)

18
LEON_PI(lda	[%g0] ASI_LEON_MMUREGS, %o0)

19
SUN_PI_(lda	[%g0] ASI_M_MMUREGS, %o0)

20
	retl

21
	 nop

22
ENDPROC(srmmu_get_mmureg)

23


24
/* void srmmu_set_mmureg(unsigned long regval) */

25
ENTRY(srmmu_set_mmureg)

26
LEON_PI(sta	%o0, [%g0] ASI_LEON_MMUREGS)

27
SUN_PI_(sta	%o0, [%g0] ASI_M_MMUREGS)

28
	retl

29
	 nop

30
ENDPROC(srmmu_set_mmureg)

31


32
/* void srmmu_set_ctable_ptr(unsigned long paddr) */

33
ENTRY(srmmu_set_ctable_ptr)

34
	/* paddr = ((paddr >> 4) & SRMMU_CTX_PMASK); */

35
	srl	%o0, 4, %g1

36
	and	%g1, SRMMU_CTX_PMASK, %g1

37


38
	mov	SRMMU_CTXTBL_PTR, %g2

39
LEON_PI(sta	%g1, [%g2] ASI_LEON_MMUREGS)

40
SUN_PI_(sta	%g1, [%g2] ASI_M_MMUREGS)

41
	retl

42
	 nop

43
ENDPROC(srmmu_set_ctable_ptr)

44


45


46
/* void srmmu_set_context(int context) */

47
ENTRY(srmmu_set_context)

48
	mov	SRMMU_CTX_REG, %g1

49
LEON_PI(sta	%o0, [%g1] ASI_LEON_MMUREGS)

50
SUN_PI_(sta	%o0, [%g1] ASI_M_MMUREGS)

51
	retl

52
	 nop

53
ENDPROC(srmmu_set_context)

54


55


56
/* int srmmu_get_context(void) */

57
ENTRY(srmmu_get_context)

58
	mov	SRMMU_CTX_REG, %o0

59
LEON_PI(lda     [%o0] ASI_LEON_MMUREGS, %o0)

60
SUN_PI_(lda	[%o0] ASI_M_MMUREGS, %o0)

61
	retl

62
	 nop

63
ENDPROC(srmmu_get_context)

64


65


66
/* unsigned int srmmu_get_fstatus(void) */

67
ENTRY(srmmu_get_fstatus)

68
	mov	SRMMU_FAULT_STATUS, %o0

69
LEON_PI(lda     [%o0] ASI_LEON_MMUREGS, %o0)

70
SUN_PI_(lda	[%o0] ASI_M_MMUREGS, %o0)

71
	retl

72
	 nop

73
ENDPROC(srmmu_get_fstatus)

74


75


76
/* unsigned int srmmu_get_faddr(void) */

77
ENTRY(srmmu_get_faddr)

78
	mov	SRMMU_FAULT_ADDR, %o0

79
LEON_PI(lda     [%o0] ASI_LEON_MMUREGS, %o0)

80
SUN_PI_(lda	[%o0] ASI_M_MMUREGS, %o0)

81
	retl

82
	 nop

83
ENDPROC(srmmu_get_faddr)

84


85