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Diffstat (limited to 'libgloss/mips/hal/mips_xpa.S')
| -rw-r--r-- | libgloss/mips/hal/mips_xpa.S | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/libgloss/mips/hal/mips_xpa.S b/libgloss/mips/hal/mips_xpa.S new file mode 100644 index 0000000..a2bf981 --- /dev/null +++ b/libgloss/mips/hal/mips_xpa.S @@ -0,0 +1,75 @@ +/* + * Copyright (C) 2015-2018 MIPS Tech, LLC + * + * 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 copyright holder 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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. +*/ + +#include <mips/regdef.h> +#include <mips/cpu.h> +#include <mips/asm.h> +#include <mips/hal.h> + +MIPS_NOMIPS16 + +/* + * FUNCTION: _xpa_save + * DESCRIPTION: save the XPA version of badvaddr. + * RETURNS: int + * 0: No context saved + * CTX_*: Type of conext stored + */ +LEAF(_xpa_save) + move a1, a0 + PTR_S zero, LINKCTX_NEXT(a1) + /* Test for LPA support */ + mfc0 t0, C0_CONFIG3 + ext t0, t0, CFG3_LPA_SHIFT, 1 + beqz t0, 1f + /* Test for LPA enabled */ + mfc0 t0, C0_PAGEGRAIN + ext t0, t0, PAGEGRAIN_ELPA_SHIFT, PAGEGRAIN_ELPA_BITS + bnez t0, 2f + + /* LPA either unavailable or not enabled - return 0 */ +1: move va0, zero + jr ra + +2: lui va0, %hi(LINKCTX_TYPE_XPA) + addiu va0, va0, %lo(LINKCTX_TYPE_XPA) + mfc0 t0, C0_BADVADDR + .set push + .set xpa + mfhc0 t1, C0_BADVADDR + .set pop +#if BYTE_ORDER == BIG_ENDIAN + sw t0, XPACTX_BADVADDR(a1) + sw t1, (XPACTX_BADVADDR+4)(a1) +#else /* BYTE ORDER == LITTLE_ENDIAN */ + sw t1, XPACTX_BADVADDR(a1) + sw t0, (XPACTX_BADVADDR+4)(a1) +#endif + REG_S va0, LINKCTX_ID(a1) + jr ra +END(_xpa_save) |