1*4882a593Smuzhiyun/* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun/* Assembler variants of srmmu access functions. 3*4882a593Smuzhiyun * Implemented in assembler to allow run-time patching. 4*4882a593Smuzhiyun * LEON uses a different ASI for MMUREGS than SUN. 5*4882a593Smuzhiyun * 6*4882a593Smuzhiyun * The leon_1insn_patch infrastructure is used 7*4882a593Smuzhiyun * for the run-time patching. 8*4882a593Smuzhiyun */ 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun#include <linux/linkage.h> 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun#include <asm/asmmacro.h> 13*4882a593Smuzhiyun#include <asm/pgtsrmmu.h> 14*4882a593Smuzhiyun#include <asm/asi.h> 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun/* unsigned int srmmu_get_mmureg(void) */ 17*4882a593SmuzhiyunENTRY(srmmu_get_mmureg) 18*4882a593SmuzhiyunLEON_PI(lda [%g0] ASI_LEON_MMUREGS, %o0) 19*4882a593SmuzhiyunSUN_PI_(lda [%g0] ASI_M_MMUREGS, %o0) 20*4882a593Smuzhiyun retl 21*4882a593Smuzhiyun nop 22*4882a593SmuzhiyunENDPROC(srmmu_get_mmureg) 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun/* void srmmu_set_mmureg(unsigned long regval) */ 25*4882a593SmuzhiyunENTRY(srmmu_set_mmureg) 26*4882a593SmuzhiyunLEON_PI(sta %o0, [%g0] ASI_LEON_MMUREGS) 27*4882a593SmuzhiyunSUN_PI_(sta %o0, [%g0] ASI_M_MMUREGS) 28*4882a593Smuzhiyun retl 29*4882a593Smuzhiyun nop 30*4882a593SmuzhiyunENDPROC(srmmu_set_mmureg) 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun/* void srmmu_set_ctable_ptr(unsigned long paddr) */ 33*4882a593SmuzhiyunENTRY(srmmu_set_ctable_ptr) 34*4882a593Smuzhiyun /* paddr = ((paddr >> 4) & SRMMU_CTX_PMASK); */ 35*4882a593Smuzhiyun srl %o0, 4, %g1 36*4882a593Smuzhiyun and %g1, SRMMU_CTX_PMASK, %g1 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun mov SRMMU_CTXTBL_PTR, %g2 39*4882a593SmuzhiyunLEON_PI(sta %g1, [%g2] ASI_LEON_MMUREGS) 40*4882a593SmuzhiyunSUN_PI_(sta %g1, [%g2] ASI_M_MMUREGS) 41*4882a593Smuzhiyun retl 42*4882a593Smuzhiyun nop 43*4882a593SmuzhiyunENDPROC(srmmu_set_ctable_ptr) 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun/* void srmmu_set_context(int context) */ 47*4882a593SmuzhiyunENTRY(srmmu_set_context) 48*4882a593Smuzhiyun mov SRMMU_CTX_REG, %g1 49*4882a593SmuzhiyunLEON_PI(sta %o0, [%g1] ASI_LEON_MMUREGS) 50*4882a593SmuzhiyunSUN_PI_(sta %o0, [%g1] ASI_M_MMUREGS) 51*4882a593Smuzhiyun retl 52*4882a593Smuzhiyun nop 53*4882a593SmuzhiyunENDPROC(srmmu_set_context) 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun 56*4882a593Smuzhiyun/* int srmmu_get_context(void) */ 57*4882a593SmuzhiyunENTRY(srmmu_get_context) 58*4882a593Smuzhiyun mov SRMMU_CTX_REG, %o0 59*4882a593SmuzhiyunLEON_PI(lda [%o0] ASI_LEON_MMUREGS, %o0) 60*4882a593SmuzhiyunSUN_PI_(lda [%o0] ASI_M_MMUREGS, %o0) 61*4882a593Smuzhiyun retl 62*4882a593Smuzhiyun nop 63*4882a593SmuzhiyunENDPROC(srmmu_get_context) 64*4882a593Smuzhiyun 65*4882a593Smuzhiyun 66*4882a593Smuzhiyun/* unsigned int srmmu_get_fstatus(void) */ 67*4882a593SmuzhiyunENTRY(srmmu_get_fstatus) 68*4882a593Smuzhiyun mov SRMMU_FAULT_STATUS, %o0 69*4882a593SmuzhiyunLEON_PI(lda [%o0] ASI_LEON_MMUREGS, %o0) 70*4882a593SmuzhiyunSUN_PI_(lda [%o0] ASI_M_MMUREGS, %o0) 71*4882a593Smuzhiyun retl 72*4882a593Smuzhiyun nop 73*4882a593SmuzhiyunENDPROC(srmmu_get_fstatus) 74*4882a593Smuzhiyun 75*4882a593Smuzhiyun 76*4882a593Smuzhiyun/* unsigned int srmmu_get_faddr(void) */ 77*4882a593SmuzhiyunENTRY(srmmu_get_faddr) 78*4882a593Smuzhiyun mov SRMMU_FAULT_ADDR, %o0 79*4882a593SmuzhiyunLEON_PI(lda [%o0] ASI_LEON_MMUREGS, %o0) 80*4882a593SmuzhiyunSUN_PI_(lda [%o0] ASI_M_MMUREGS, %o0) 81*4882a593Smuzhiyun retl 82*4882a593Smuzhiyun nop 83*4882a593SmuzhiyunENDPROC(srmmu_get_faddr) 84