| /* |
| * Copyright 2010 Tilera Corporation. All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation, version 2. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| * NON INFRINGEMENT. See the GNU General Public License for |
| * more details. |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/errno.h> |
| #include <asm/cache.h> |
| #include <arch/chip.h> |
| |
| /* Access user memory, but use MMU to avoid propagating kernel exceptions. */ |
| |
| /* |
| * clear_user_asm takes the user target address in r0 and the |
| * number of bytes to zero in r1. |
| * It returns the number of uncopiable bytes (hopefully zero) in r0. |
| * Note that we don't use a separate .fixup section here since we fall |
| * through into the "fixup" code as the last straight-line bundle anyway. |
| */ |
| STD_ENTRY(clear_user_asm) |
| { bz r1, 2f; or r2, r0, r1 } |
| andi r2, r2, 3 |
| bzt r2, .Lclear_aligned_user_asm |
| 1: { sb r0, zero; addi r0, r0, 1; addi r1, r1, -1 } |
| bnzt r1, 1b |
| 2: { move r0, r1; jrp lr } |
| .pushsection __ex_table,"a" |
| .align 4 |
| .word 1b, 2b |
| .popsection |
| |
| .Lclear_aligned_user_asm: |
| 1: { sw r0, zero; addi r0, r0, 4; addi r1, r1, -4 } |
| bnzt r1, 1b |
| 2: { move r0, r1; jrp lr } |
| STD_ENDPROC(clear_user_asm) |
| .pushsection __ex_table,"a" |
| .align 4 |
| .word 1b, 2b |
| .popsection |
| |
| /* |
| * flush_user_asm takes the user target address in r0 and the |
| * number of bytes to flush in r1. |
| * It returns the number of unflushable bytes (hopefully zero) in r0. |
| */ |
| STD_ENTRY(flush_user_asm) |
| bz r1, 2f |
| { movei r2, L2_CACHE_BYTES; add r1, r0, r1 } |
| { sub r2, zero, r2; addi r1, r1, L2_CACHE_BYTES-1 } |
| { and r0, r0, r2; and r1, r1, r2 } |
| { sub r1, r1, r0 } |
| 1: { flush r0; addi r1, r1, -CHIP_FLUSH_STRIDE() } |
| { addi r0, r0, CHIP_FLUSH_STRIDE(); bnzt r1, 1b } |
| 2: { move r0, r1; jrp lr } |
| STD_ENDPROC(flush_user_asm) |
| .pushsection __ex_table,"a" |
| .align 4 |
| .word 1b, 2b |
| .popsection |
| |
| /* |
| * finv_user_asm takes the user target address in r0 and the |
| * number of bytes to flush-invalidate in r1. |
| * It returns the number of not finv'able bytes (hopefully zero) in r0. |
| */ |
| STD_ENTRY(finv_user_asm) |
| bz r1, 2f |
| { movei r2, L2_CACHE_BYTES; add r1, r0, r1 } |
| { sub r2, zero, r2; addi r1, r1, L2_CACHE_BYTES-1 } |
| { and r0, r0, r2; and r1, r1, r2 } |
| { sub r1, r1, r0 } |
| 1: { finv r0; addi r1, r1, -CHIP_FINV_STRIDE() } |
| { addi r0, r0, CHIP_FINV_STRIDE(); bnzt r1, 1b } |
| 2: { move r0, r1; jrp lr } |
| STD_ENDPROC(finv_user_asm) |
| .pushsection __ex_table,"a" |
| .align 4 |
| .word 1b, 2b |
| .popsection |
