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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
6729cf79 SR |
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) |