| Gerald Schaefer | a80313f | 2019-02-03 21:37:20 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* |
| 3 | * Code that needs to run below 2 GB. |
| 4 | * |
| 5 | * Copyright IBM Corp. 2019 |
| 6 | */ |
| 7 | |
| 8 | #include <linux/linkage.h> |
| 9 | #include <asm/errno.h> |
| 10 | #include <asm/sigp.h> |
| 11 | |
| Martin Schwidefsky | bf72630 | 2019-04-12 08:57:34 +0200 | [diff] [blame] | 12 | #ifdef CC_USING_EXPOLINE |
| 13 | .pushsection .dma.text.__s390_indirect_jump_r14,"axG" |
| 14 | __dma__s390_indirect_jump_r14: |
| 15 | larl %r1,0f |
| 16 | ex 0,0(%r1) |
| 17 | j . |
| 18 | 0: br %r14 |
| 19 | .popsection |
| 20 | #endif |
| 21 | |
| Gerald Schaefer | a80313f | 2019-02-03 21:37:20 +0100 | [diff] [blame] | 22 | .section .dma.text,"ax" |
| 23 | /* |
| 24 | * Simplified version of expoline thunk. The normal thunks can not be used here, |
| 25 | * because they might be more than 2 GB away, and not reachable by the relative |
| 26 | * branch. No comdat, exrl, etc. optimizations used here, because it only |
| 27 | * affects a few functions that are not performance-relevant. |
| 28 | */ |
| 29 | .macro BR_EX_DMA_r14 |
| Martin Schwidefsky | bf72630 | 2019-04-12 08:57:34 +0200 | [diff] [blame] | 30 | #ifdef CC_USING_EXPOLINE |
| 31 | jg __dma__s390_indirect_jump_r14 |
| 32 | #else |
| 33 | br %r14 |
| 34 | #endif |
| Gerald Schaefer | a80313f | 2019-02-03 21:37:20 +0100 | [diff] [blame] | 35 | .endm |
| 36 | |
| 37 | /* |
| 38 | * int _diag14_dma(unsigned long rx, unsigned long ry1, unsigned long subcode) |
| 39 | */ |
| 40 | ENTRY(_diag14_dma) |
| 41 | lgr %r1,%r2 |
| 42 | lgr %r2,%r3 |
| 43 | lgr %r3,%r4 |
| 44 | lhi %r5,-EIO |
| 45 | sam31 |
| 46 | diag %r1,%r2,0x14 |
| 47 | .Ldiag14_ex: |
| 48 | ipm %r5 |
| 49 | srl %r5,28 |
| 50 | .Ldiag14_fault: |
| 51 | sam64 |
| 52 | lgfr %r2,%r5 |
| 53 | BR_EX_DMA_r14 |
| 54 | EX_TABLE_DMA(.Ldiag14_ex, .Ldiag14_fault) |
| Martin Schwidefsky | 26a374a | 2019-01-17 10:02:22 +0100 | [diff] [blame] | 55 | ENDPROC(_diag14_dma) |
| Gerald Schaefer | a80313f | 2019-02-03 21:37:20 +0100 | [diff] [blame] | 56 | |
| 57 | /* |
| 58 | * int _diag210_dma(struct diag210 *addr) |
| 59 | */ |
| 60 | ENTRY(_diag210_dma) |
| 61 | lgr %r1,%r2 |
| 62 | lhi %r2,-1 |
| 63 | sam31 |
| 64 | diag %r1,%r0,0x210 |
| 65 | .Ldiag210_ex: |
| 66 | ipm %r2 |
| 67 | srl %r2,28 |
| 68 | .Ldiag210_fault: |
| 69 | sam64 |
| 70 | lgfr %r2,%r2 |
| 71 | BR_EX_DMA_r14 |
| 72 | EX_TABLE_DMA(.Ldiag210_ex, .Ldiag210_fault) |
| Martin Schwidefsky | 26a374a | 2019-01-17 10:02:22 +0100 | [diff] [blame] | 73 | ENDPROC(_diag210_dma) |
| Gerald Schaefer | a80313f | 2019-02-03 21:37:20 +0100 | [diff] [blame] | 74 | |
| 75 | /* |
| 76 | * int _diag26c_dma(void *req, void *resp, enum diag26c_sc subcode) |
| 77 | */ |
| 78 | ENTRY(_diag26c_dma) |
| 79 | lghi %r5,-EOPNOTSUPP |
| 80 | sam31 |
| 81 | diag %r2,%r4,0x26c |
| 82 | .Ldiag26c_ex: |
| 83 | sam64 |
| 84 | lgfr %r2,%r5 |
| 85 | BR_EX_DMA_r14 |
| 86 | EX_TABLE_DMA(.Ldiag26c_ex, .Ldiag26c_ex) |
| Martin Schwidefsky | 26a374a | 2019-01-17 10:02:22 +0100 | [diff] [blame] | 87 | ENDPROC(_diag26c_dma) |
| Gerald Schaefer | a80313f | 2019-02-03 21:37:20 +0100 | [diff] [blame] | 88 | |
| 89 | /* |
| 90 | * void _diag0c_dma(struct hypfs_diag0c_entry *entry) |
| 91 | */ |
| 92 | ENTRY(_diag0c_dma) |
| 93 | sam31 |
| 94 | diag %r2,%r2,0x0c |
| 95 | sam64 |
| 96 | BR_EX_DMA_r14 |
| Martin Schwidefsky | 26a374a | 2019-01-17 10:02:22 +0100 | [diff] [blame] | 97 | ENDPROC(_diag0c_dma) |
| Gerald Schaefer | a80313f | 2019-02-03 21:37:20 +0100 | [diff] [blame] | 98 | |
| 99 | /* |
| Gerald Schaefer | a80313f | 2019-02-03 21:37:20 +0100 | [diff] [blame] | 100 | * void _diag308_reset_dma(void) |
| 101 | * |
| 102 | * Calls diag 308 subcode 1 and continues execution |
| 103 | */ |
| 104 | ENTRY(_diag308_reset_dma) |
| 105 | larl %r4,.Lctlregs # Save control registers |
| 106 | stctg %c0,%c15,0(%r4) |
| 107 | lg %r2,0(%r4) # Disable lowcore protection |
| 108 | nilh %r2,0xefff |
| 109 | larl %r4,.Lctlreg0 |
| 110 | stg %r2,0(%r4) |
| 111 | lctlg %c0,%c0,0(%r4) |
| 112 | larl %r4,.Lfpctl # Floating point control register |
| 113 | stfpc 0(%r4) |
| 114 | larl %r4,.Lprefix # Save prefix register |
| 115 | stpx 0(%r4) |
| 116 | larl %r4,.Lprefix_zero # Set prefix register to 0 |
| 117 | spx 0(%r4) |
| 118 | larl %r4,.Lcontinue_psw # Save PSW flags |
| 119 | epsw %r2,%r3 |
| 120 | stm %r2,%r3,0(%r4) |
| 121 | larl %r4,restart_part2 # Setup restart PSW at absolute 0 |
| 122 | larl %r3,.Lrestart_diag308_psw |
| 123 | og %r4,0(%r3) # Save PSW |
| 124 | lghi %r3,0 |
| 125 | sturg %r4,%r3 # Use sturg, because of large pages |
| 126 | lghi %r1,1 |
| 127 | lghi %r0,0 |
| 128 | diag %r0,%r1,0x308 |
| 129 | restart_part2: |
| 130 | lhi %r0,0 # Load r0 with zero |
| 131 | lhi %r1,2 # Use mode 2 = ESAME (dump) |
| 132 | sigp %r1,%r0,SIGP_SET_ARCHITECTURE # Switch to ESAME mode |
| 133 | sam64 # Switch to 64 bit addressing mode |
| 134 | larl %r4,.Lctlregs # Restore control registers |
| 135 | lctlg %c0,%c15,0(%r4) |
| 136 | larl %r4,.Lfpctl # Restore floating point ctl register |
| 137 | lfpc 0(%r4) |
| 138 | larl %r4,.Lprefix # Restore prefix register |
| 139 | spx 0(%r4) |
| 140 | larl %r4,.Lcontinue_psw # Restore PSW flags |
| 141 | lpswe 0(%r4) |
| 142 | .Lcontinue: |
| 143 | BR_EX_DMA_r14 |
| Martin Schwidefsky | 26a374a | 2019-01-17 10:02:22 +0100 | [diff] [blame] | 144 | ENDPROC(_diag308_reset_dma) |
| Gerald Schaefer | a80313f | 2019-02-03 21:37:20 +0100 | [diff] [blame] | 145 | |
| 146 | .section .dma.data,"aw",@progbits |
| 147 | .align 8 |
| 148 | .Lrestart_diag308_psw: |
| 149 | .long 0x00080000,0x80000000 |
| 150 | |
| 151 | .align 8 |
| 152 | .Lcontinue_psw: |
| 153 | .quad 0,.Lcontinue |
| 154 | |
| 155 | .align 8 |
| 156 | .Lctlreg0: |
| 157 | .quad 0 |
| 158 | .Lctlregs: |
| 159 | .rept 16 |
| 160 | .quad 0 |
| 161 | .endr |
| 162 | .Lfpctl: |
| 163 | .long 0 |
| 164 | .Lprefix: |
| 165 | .long 0 |
| 166 | .Lprefix_zero: |
| 167 | .long 0 |