| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Code that needs to run below 2 GB. |
| * |
| * Copyright IBM Corp. 2019 |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/asm-extable.h> |
| #include <asm/errno.h> |
| #include <asm/sigp.h> |
| |
| .section .amode31.text,"ax" |
| /* |
| * Simplified version of expoline thunk. The normal thunks can not be used here, |
| * because they might be more than 2 GB away, and not reachable by the relative |
| * branch. No comdat, exrl, etc. optimizations used here, because it only |
| * affects a few functions that are not performance-relevant. |
| */ |
| .macro BR_EX_AMODE31_r14 |
| larl %r1,0f |
| ex 0,0(%r1) |
| j . |
| 0: br %r14 |
| .endm |
| |
| /* |
| * int _diag14_amode31(unsigned long rx, unsigned long ry1, unsigned long subcode) |
| */ |
| ENTRY(_diag14_amode31) |
| lgr %r1,%r2 |
| lgr %r2,%r3 |
| lgr %r3,%r4 |
| lhi %r5,-EIO |
| sam31 |
| diag %r1,%r2,0x14 |
| .Ldiag14_ex: |
| ipm %r5 |
| srl %r5,28 |
| .Ldiag14_fault: |
| sam64 |
| lgfr %r2,%r5 |
| BR_EX_AMODE31_r14 |
| EX_TABLE_AMODE31(.Ldiag14_ex, .Ldiag14_fault) |
| ENDPROC(_diag14_amode31) |
| |
| /* |
| * int _diag210_amode31(struct diag210 *addr) |
| */ |
| ENTRY(_diag210_amode31) |
| lgr %r1,%r2 |
| lhi %r2,-1 |
| sam31 |
| diag %r1,%r0,0x210 |
| .Ldiag210_ex: |
| ipm %r2 |
| srl %r2,28 |
| .Ldiag210_fault: |
| sam64 |
| lgfr %r2,%r2 |
| BR_EX_AMODE31_r14 |
| EX_TABLE_AMODE31(.Ldiag210_ex, .Ldiag210_fault) |
| ENDPROC(_diag210_amode31) |
| |
| /* |
| * int _diag26c_amode31(void *req, void *resp, enum diag26c_sc subcode) |
| */ |
| ENTRY(_diag26c_amode31) |
| lghi %r5,-EOPNOTSUPP |
| sam31 |
| diag %r2,%r4,0x26c |
| .Ldiag26c_ex: |
| sam64 |
| lgfr %r2,%r5 |
| BR_EX_AMODE31_r14 |
| EX_TABLE_AMODE31(.Ldiag26c_ex, .Ldiag26c_ex) |
| ENDPROC(_diag26c_amode31) |
| |
| /* |
| * void _diag0c_amode31(struct hypfs_diag0c_entry *entry) |
| */ |
| ENTRY(_diag0c_amode31) |
| sam31 |
| diag %r2,%r2,0x0c |
| sam64 |
| BR_EX_AMODE31_r14 |
| ENDPROC(_diag0c_amode31) |
| |
| /* |
| * void _diag308_reset_amode31(void) |
| * |
| * Calls diag 308 subcode 1 and continues execution |
| */ |
| ENTRY(_diag308_reset_amode31) |
| larl %r4,.Lctlregs # Save control registers |
| stctg %c0,%c15,0(%r4) |
| lg %r2,0(%r4) # Disable lowcore protection |
| nilh %r2,0xefff |
| larl %r4,.Lctlreg0 |
| stg %r2,0(%r4) |
| lctlg %c0,%c0,0(%r4) |
| larl %r4,.Lfpctl # Floating point control register |
| stfpc 0(%r4) |
| larl %r4,.Lprefix # Save prefix register |
| stpx 0(%r4) |
| larl %r4,.Lprefix_zero # Set prefix register to 0 |
| spx 0(%r4) |
| larl %r4,.Lcontinue_psw # Save PSW flags |
| epsw %r2,%r3 |
| stm %r2,%r3,0(%r4) |
| larl %r4,.Lrestart_part2 # Setup restart PSW at absolute 0 |
| larl %r3,.Lrestart_diag308_psw |
| og %r4,0(%r3) # Save PSW |
| lghi %r3,0 |
| sturg %r4,%r3 # Use sturg, because of large pages |
| lghi %r1,1 |
| lghi %r0,0 |
| diag %r0,%r1,0x308 |
| .Lrestart_part2: |
| lhi %r0,0 # Load r0 with zero |
| lhi %r1,2 # Use mode 2 = ESAME (dump) |
| sigp %r1,%r0,SIGP_SET_ARCHITECTURE # Switch to ESAME mode |
| sam64 # Switch to 64 bit addressing mode |
| larl %r4,.Lctlregs # Restore control registers |
| lctlg %c0,%c15,0(%r4) |
| larl %r4,.Lfpctl # Restore floating point ctl register |
| lfpc 0(%r4) |
| larl %r4,.Lprefix # Restore prefix register |
| spx 0(%r4) |
| larl %r4,.Lcontinue_psw # Restore PSW flags |
| larl %r2,.Lcontinue |
| stg %r2,8(%r4) |
| lpswe 0(%r4) |
| .Lcontinue: |
| BR_EX_AMODE31_r14 |
| ENDPROC(_diag308_reset_amode31) |
| |
| .section .amode31.data,"aw",@progbits |
| .align 8 |
| .Lrestart_diag308_psw: |
| .long 0x00080000,0x80000000 |
| |
| .align 8 |
| .Lcontinue_psw: |
| .quad 0,0 |
| |
| .align 8 |
| .Lctlreg0: |
| .quad 0 |
| .Lctlregs: |
| .rept 16 |
| .quad 0 |
| .endr |
| .Lfpctl: |
| .long 0 |
| .Lprefix: |
| .long 0 |
| .Lprefix_zero: |
| .long 0 |
