[SCM] GNU Mach branch, master, updated. v1.8-227-g231bd7f

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit 231bd7fdc04517389135a4958294cf7630617385
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Sat Nov 28 19:01:00 2020 +0100

    x86: Drop XSAVE support limitation
    
    Now that XSAVEOPT is supported, we are fine with supporting large FPU
    state.
    
    * i386/i386/fpu.c (init_fpu): Do not limit fp_xsave_support to
    CPU_XCR0_SUPPORTED.
    * i386/i386/fpu.h (CPU_XCR0_SUPPORTED): Remove macro.

commit 9dd636371312ef48fa5f6bc068360ce81d2e367f
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Sat Nov 28 18:57:01 2020 +0100

    x86: Add XSAVEOPT, XSAVEC, XSAVES support
    
    * i386/i386/fpu.h (CPU_FEATURE_XSAVEOPT, CPU_FEATURE_XSAVEC,
    CPU_FEATURE_XGETBV1, CPU_FEATURE_XSAVES): New macros.
    (xsaveopt, xsavec, xsaves, xrstors): New macros.
    (fpu_save_context): Use xsaveopt, xsavec, or xsaves when available.
    (fp_save_kind): New enum.
    (fp_save_kind): New variable declaration.
    * i386/i386/fpu.c (fp_save_kind): New variable.
    (init_fpu): Set fp_save_kind according to enumeration. When XSAVES is
    supported, use xsave area size from corresponding enumeration.
    (fp_save): Use xsaveopt, xsavec, xsaves when available.
    (fp_load): Use xrstors when available.

commit 0e59d87e06f967680d250b9a74d08da1389b6212
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Sat Nov 28 17:57:21 2020 +0100

    x86: Extend XSAVE support to unbound state
    
    * i386/i386/fpu.c (fp_xsave_size): New variable.
    (init_fpu): Save XSAVE size to fp_xsave_size.
    (fpu_module_init): Pass fp_xsave_size as size to kmem_cache_init.
    (fpu_set_state, fp_load, fp_state_alloc): Use fp_xsave_size to clear
    ifps.
    * i386/include/mach/i386/fp_reg.h (struct i386_xfp_save): Replace static
    fp_yreg_word with extended field.
    * i386/i386/thread.h (struct i386_fpsave_state): Make fp_valid field
    first in the structure to let the extended finish the structure.

commit b885c5ea26fb3c2f2d91b6e9a1495070da429ea4
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Sat Nov 28 16:30:29 2020 +0100

    x86: Add XSAVE support
    
    * i386/i386/fpu.h (CPU_XCR0_X87, CPU_XCR0_SSE, CPU_XCR0_AVX,
    CPU_XCR0_MPX, CPU_XCR0_AVX512): New macros.
    (xsave): Pass fp_xsave_support to xsave.
    (fpu_save_context): When fp_kind is FP_387X, use xsave.
    (fp_xsave_support): New variable declaration.
    * i386/i386/proc_reg.h (cpuid): New macro.
    * linux/src/include/asm-i386/processor.h (cpuid): Disable macro.
    * i386/include/mach/i386/fp_reg.h: Include <stdint.h>
    (i386_xfp_xstate_header): New structure.
    (i386_xfp_save): Add xsave fields.
    * i386/i386/fpu.c (fp_xsave_support): New variable.
    (init_fpu): Look for XSAVE feature; if available, get the supported
    parts and set fp_kind to FP_387X.
    (fpu_module_init): Set ifps_cache alignment to alignof(struct
    i386_fpsave_state).
    (fpu_set_state): Make sure to clear all the ifps structure.
    Reuse the FP_387FX for the FP_387X case.
    (fpu_get_state, fpexterrflt, fpastintr, fp_state_alloc): Reuse the FP_387FX
    for the FP_387X case.
    (fp_save): When fp_kind is FP_387X, use xsave.
    (fp_load): When fp_kind is FP_387X, use xrstor.
    Reuse the FP_387FX for the FP_387X case.

commit 44e3fb20a17dac403ec022a9c4d41dc237f3c79d
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Sat Nov 28 12:07:41 2020 +0100

    fpu: Rename FP_387X to FP_387FX
    
    To leave FP_387X for XSAVE-supporting CPU (as opposed to
    FXSAVE-supporting CPU)
    
    * i386/include/mach/i386/fp_reg.h (FP_387X): Rename to FP_387FX.
    (FP_387X): New macro.
    * i386/i386/fpu.c (init_fpu, fpu_set_state, fpu_get_state, fpexterrflt,
    fpastintr, fp_save, fp_load, fp_state_alloc): Update accordingly.
    * i386/i386/fpu.h (fpu_save_context): Likewise.

-----------------------------------------------------------------------

Summary of changes:
 i386/i386/fpu.c                        | 125 ++++++++++++++++++++++++++-------
 i386/i386/fpu.h                        |  71 +++++++++++++++++--
 i386/i386/proc_reg.h                   |  22 ++++++
 i386/i386/thread.h                     |   3 +-
 i386/include/mach/i386/fp_reg.h        |  27 +++++--
 linux/src/include/asm-i386/processor.h |   2 +
 6 files changed, 213 insertions(+), 37 deletions(-)


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