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 | |