18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0-or-later */ 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * "Indirect" DCR access 48c2ecf20Sopenharmony_ci * 58c2ecf20Sopenharmony_ci * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net> 68c2ecf20Sopenharmony_ci */ 78c2ecf20Sopenharmony_ci 88c2ecf20Sopenharmony_ci#include <asm/ppc_asm.h> 98c2ecf20Sopenharmony_ci#include <asm/processor.h> 108c2ecf20Sopenharmony_ci#include <asm/bug.h> 118c2ecf20Sopenharmony_ci#include <asm/export.h> 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_ci#define DCR_ACCESS_PROLOG(table) \ 148c2ecf20Sopenharmony_ci cmplwi cr0,r3,1024; \ 158c2ecf20Sopenharmony_ci rlwinm r3,r3,4,18,27; \ 168c2ecf20Sopenharmony_ci lis r5,table@h; \ 178c2ecf20Sopenharmony_ci ori r5,r5,table@l; \ 188c2ecf20Sopenharmony_ci add r3,r3,r5; \ 198c2ecf20Sopenharmony_ci bge- 1f; \ 208c2ecf20Sopenharmony_ci mtctr r3; \ 218c2ecf20Sopenharmony_ci bctr; \ 228c2ecf20Sopenharmony_ci1: trap; \ 238c2ecf20Sopenharmony_ci EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0; \ 248c2ecf20Sopenharmony_ci blr 258c2ecf20Sopenharmony_ci 268c2ecf20Sopenharmony_ci_GLOBAL(__mfdcr) 278c2ecf20Sopenharmony_ci DCR_ACCESS_PROLOG(__mfdcr_table) 288c2ecf20Sopenharmony_ciEXPORT_SYMBOL(__mfdcr) 298c2ecf20Sopenharmony_ci 308c2ecf20Sopenharmony_ci_GLOBAL(__mtdcr) 318c2ecf20Sopenharmony_ci DCR_ACCESS_PROLOG(__mtdcr_table) 328c2ecf20Sopenharmony_ciEXPORT_SYMBOL(__mtdcr) 338c2ecf20Sopenharmony_ci 348c2ecf20Sopenharmony_ci__mfdcr_table: 358c2ecf20Sopenharmony_ci mfdcr r3,0; blr 368c2ecf20Sopenharmony_ci__mtdcr_table: 378c2ecf20Sopenharmony_ci mtdcr 0,r4; blr 388c2ecf20Sopenharmony_ci 398c2ecf20Sopenharmony_cidcr = 1 408c2ecf20Sopenharmony_ci .rept 1023 418c2ecf20Sopenharmony_ci mfdcr r3,dcr; blr 428c2ecf20Sopenharmony_ci mtdcr dcr,r4; blr 438c2ecf20Sopenharmony_ci dcr = dcr + 1 448c2ecf20Sopenharmony_ci .endr 45