/* $NetBSD: locore_machdep.S,v 1.26 2024/02/05 22:18:17 andvar Exp $ */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Digital Equipment Corporation and Ralph Campbell. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Copyright (C) 1989 Digital Equipment Corporation. * Permission to use, copy, modify, and distribute this software and * its documentation for any purpose and without fee is hereby granted, * provided that the above copyright notice appears in all copies. * Digital Equipment Corporation makes no representations about the * suitability of this software for any purpose. It is provided "as is" * without express or implied warranty. * * from: Header: /sprite/src/kernel/mach/ds3100.md/RCS/loMem.s, * v 1.1 89/07/11 17:55:04 nelson Exp SPRITE (DECWRL) * from: Header: /sprite/src/kernel/mach/ds3100.md/RCS/machAsm.s, * v 9.2 90/01/29 18:00:39 shirriff Exp SPRITE (DECWRL) * from: Header: /sprite/src/kernel/vm/ds3100.md/vmPmaxAsm.s, * v 1.1 89/07/10 14:27:41 nelson Exp SPRITE (DECWRL) * * @(#)locore.s 8.5 (Berkeley) 1/4/94 */ /* * DECstation-specific mips locore code. */ #include <mips/asm.h> #include <mips/cpuregs.h> /* XXX - misnomer? */ #include "assym.h" #include "sii.h" #include "opt_dec_5100.h" #include "opt_dec_5400.h" .set noreorder #if NSII > 0 /* * Copy data to a DMA buffer padded with 16 bits of data, 16 * bits of padding per 32bit word (e.g., for pmin/pmax sii DMA). * * The DMA buffer can only be written one short at a time * (and takes ~14 cycles). * * CopyToBuffer(src, dst, length) * u_short *src; NOTE: must be short aligned * u_short *dst; * int length; */ LEAF(CopyToBuffer) blez a2, 2f nop 1: lhu t0, 0(a0) # read 2 bytes of data PTR_SUBU a2, 2 PTR_ADDU a0, 2 PTR_ADDU a1, 4 bgtz a2, 1b sh t0, -4(a1) # write 2 bytes of data to buffer 2: j ra nop END(CopyToBuffer) /* * Copy data from the DMA buffer. * The DMA buffer can only be read one short at a time * (and takes ~12 cycles). * * CopyFromBuffer(src, dst, length) * u_short *src; * char *dst; * int length; */ LEAF(CopyFromBuffer) and t0, a1, 1 # test for aligned dst beq t0, zero, 3f nop blt a2, 2, 7f # at least 2 bytes to copy? nop 1: lhu t0, 0(a0) # read 2 bytes of data from buffer PTR_ADDU a0, 4 # keep buffer pointer word aligned PTR_ADDU a1, 2 PTR_SUBU a2, 2 sb t0, -2(a1) srl t0, 8 bge a2, 2, 1b sb t0, -1(a1) 3: blt a2, 2, 7f # at least 2 bytes to copy? nop 6: lhu t0, 0(a0) # read 2 bytes of data from buffer PTR_ADDU a0, 4 # keep buffer pointer word aligned PTR_ADDU a1, 2 PTR_SUBU a2, 2 bge a2, 2, 6b sh t0, -2(a1) 7: blez a2, 9f # done? nop lhu t0, 0(a0) # copy one more byte nop sb t0, 0(a1) 9: j ra nop END(CopyFromBuffer) #endif /* NSII > 0 */ /* * Write-buffer flush for writebuffer hardware on DEC mips r2000a */ #if defined(DEC_5100) || defined(DEC_5400) LEAF(dec_mips1_wbflush) ALEAF(kn230_wbflush) ALEAF(kn210_wbflush) mfc0 v0, MIPS_COP_0_STATUS # save original SR in v0 li t0, 0x80000000 # set CU3 bit or v1, v0 ,t0 # v1 = v0 | 0x80000000 nop mtc0 v1, MIPS_COP_0_STATUS nop /* two more cycles to complete */ nop 1: # spin bc3f 1b # until write buffer drained nop # (branch delay slot) mtc0 v0, MIPS_COP_0_STATUS # restore SR on exit nop j ra nop END(dec_mips1_wbflush) #endif /* defined(DEC_5100) || defined(DEC_5400) */ #ifdef __mips_o32 NESTED(promcall, CALLFRAME_SIZ, ra) PTR_SUBU sp, CALLFRAME_SIZ REG_S ra, CALLFRAME_RA(sp) REG_S s0, CALLFRAME_SP(sp) move s0, t8 /* save MIPS_CURLWP */ sll t9, a0, 0 sll a0, a1, 0 sll a1, a2, 0 sll a2, a3, 0 jalr t9 nop move t8, s0 /* restore MIPS_CURLWP */ REG_L ra, CALLFRAME_RA(sp) REG_L s0, CALLFRAME_SP(sp) jr ra PTR_ADDU sp, CALLFRAME_SIZ END(promcall) #else NESTED(promcall, TF_SIZ, ra) PTR_SUBU sp, TF_SIZ REG_S ra, TF_REG_RA(sp) REG_S s0, TF_REG_S0(sp) REG_S s1, TF_REG_S1(sp) REG_S s2, TF_REG_S2(sp) REG_S s3, TF_REG_S3(sp) REG_S s4, TF_REG_S4(sp) REG_S s5, TF_REG_S5(sp) REG_S s6, TF_REG_S6(sp) REG_S s7, TF_REG_S7(sp) REG_S s8, TF_REG_S8(sp) REG_S t8, TF_REG_T8(sp) REG_S gp, TF_REG_GP(sp) sll t9, a0, 0 sll a0, a1, 0 sll a1, a2, 0 sll a2, a3, 0 jalr t9 nop sll v0, v0, 0 REG_L ra, TF_REG_RA(sp) REG_L s0, TF_REG_S0(sp) REG_L s1, TF_REG_S1(sp) REG_L s2, TF_REG_S2(sp) REG_L s3, TF_REG_S3(sp) REG_L s4, TF_REG_S4(sp) REG_L s5, TF_REG_S5(sp) REG_L s6, TF_REG_S6(sp) REG_L s7, TF_REG_S7(sp) REG_L s8, TF_REG_S8(sp) REG_L t8, TF_REG_T8(sp) REG_L gp, TF_REG_GP(sp) PTR_ADDU sp, TF_SIZ j ra nop END(promcall) #endif
