mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a30469e792
Impact: save/restore Intel-AVX state properly between tasks Intel Advanced Vector Extensions (AVX) introduce 256-bit vector processing capability. More about AVX at http://software.intel.com/sites/avx Add OS support for YMM state management using xsave/xrstor infrastructure to support AVX. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> LKML-Reference: <1239402084.27006.8057.camel@localhost.localdomain> Signed-off-by: Ingo Molnar <mingo@elte.hu>
291 lines
7.2 KiB
C
291 lines
7.2 KiB
C
#ifndef _ASM_X86_SIGCONTEXT_H
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#define _ASM_X86_SIGCONTEXT_H
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#include <linux/compiler.h>
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#include <linux/types.h>
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#define FP_XSTATE_MAGIC1 0x46505853U
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#define FP_XSTATE_MAGIC2 0x46505845U
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#define FP_XSTATE_MAGIC2_SIZE sizeof(FP_XSTATE_MAGIC2)
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/*
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* bytes 464..511 in the current 512byte layout of fxsave/fxrstor frame
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* are reserved for SW usage. On cpu's supporting xsave/xrstor, these bytes
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* are used to extended the fpstate pointer in the sigcontext, which now
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* includes the extended state information along with fpstate information.
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*
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* Presence of FP_XSTATE_MAGIC1 at the beginning of this SW reserved
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* area and FP_XSTATE_MAGIC2 at the end of memory layout
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* (extended_size - FP_XSTATE_MAGIC2_SIZE) indicates the presence of the
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* extended state information in the memory layout pointed by the fpstate
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* pointer in sigcontext.
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*/
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struct _fpx_sw_bytes {
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__u32 magic1; /* FP_XSTATE_MAGIC1 */
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__u32 extended_size; /* total size of the layout referred by
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* fpstate pointer in the sigcontext.
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*/
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__u64 xstate_bv;
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/* feature bit mask (including fp/sse/extended
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* state) that is present in the memory
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* layout.
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*/
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__u32 xstate_size; /* actual xsave state size, based on the
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* features saved in the layout.
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* 'extended_size' will be greater than
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* 'xstate_size'.
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*/
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__u32 padding[7]; /* for future use. */
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};
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#ifdef __i386__
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/*
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* As documented in the iBCS2 standard..
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*
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* The first part of "struct _fpstate" is just the normal i387
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* hardware setup, the extra "status" word is used to save the
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* coprocessor status word before entering the handler.
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*
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* Pentium III FXSR, SSE support
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* Gareth Hughes <gareth@valinux.com>, May 2000
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*
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* The FPU state data structure has had to grow to accommodate the
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* extended FPU state required by the Streaming SIMD Extensions.
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* There is no documented standard to accomplish this at the moment.
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*/
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struct _fpreg {
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unsigned short significand[4];
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unsigned short exponent;
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};
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struct _fpxreg {
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unsigned short significand[4];
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unsigned short exponent;
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unsigned short padding[3];
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};
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struct _xmmreg {
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unsigned long element[4];
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};
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struct _fpstate {
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/* Regular FPU environment */
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unsigned long cw;
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unsigned long sw;
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unsigned long tag;
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unsigned long ipoff;
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unsigned long cssel;
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unsigned long dataoff;
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unsigned long datasel;
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struct _fpreg _st[8];
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unsigned short status;
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unsigned short magic; /* 0xffff = regular FPU data only */
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/* FXSR FPU environment */
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unsigned long _fxsr_env[6]; /* FXSR FPU env is ignored */
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unsigned long mxcsr;
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unsigned long reserved;
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struct _fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */
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struct _xmmreg _xmm[8];
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unsigned long padding1[44];
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union {
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unsigned long padding2[12];
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struct _fpx_sw_bytes sw_reserved; /* represents the extended
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* state info */
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};
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};
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#define X86_FXSR_MAGIC 0x0000
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#ifdef __KERNEL__
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struct sigcontext {
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unsigned short gs, __gsh;
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unsigned short fs, __fsh;
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unsigned short es, __esh;
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unsigned short ds, __dsh;
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unsigned long di;
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unsigned long si;
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unsigned long bp;
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unsigned long sp;
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unsigned long bx;
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unsigned long dx;
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unsigned long cx;
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unsigned long ax;
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unsigned long trapno;
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unsigned long err;
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unsigned long ip;
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unsigned short cs, __csh;
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unsigned long flags;
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unsigned long sp_at_signal;
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unsigned short ss, __ssh;
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/*
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* fpstate is really (struct _fpstate *) or (struct _xstate *)
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* depending on the FP_XSTATE_MAGIC1 encoded in the SW reserved
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* bytes of (struct _fpstate) and FP_XSTATE_MAGIC2 present at the end
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* of extended memory layout. See comments at the defintion of
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* (struct _fpx_sw_bytes)
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*/
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void __user *fpstate; /* zero when no FPU/extended context */
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unsigned long oldmask;
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unsigned long cr2;
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};
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#else /* __KERNEL__ */
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/*
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* User-space might still rely on the old definition:
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*/
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struct sigcontext {
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unsigned short gs, __gsh;
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unsigned short fs, __fsh;
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unsigned short es, __esh;
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unsigned short ds, __dsh;
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unsigned long edi;
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unsigned long esi;
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unsigned long ebp;
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unsigned long esp;
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unsigned long ebx;
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unsigned long edx;
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unsigned long ecx;
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unsigned long eax;
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unsigned long trapno;
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unsigned long err;
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unsigned long eip;
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unsigned short cs, __csh;
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unsigned long eflags;
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unsigned long esp_at_signal;
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unsigned short ss, __ssh;
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struct _fpstate __user *fpstate;
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unsigned long oldmask;
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unsigned long cr2;
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};
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#endif /* !__KERNEL__ */
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#else /* __i386__ */
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/* FXSAVE frame */
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/* Note: reserved1/2 may someday contain valuable data. Always save/restore
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them when you change signal frames. */
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struct _fpstate {
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__u16 cwd;
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__u16 swd;
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__u16 twd; /* Note this is not the same as the
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32bit/x87/FSAVE twd */
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__u16 fop;
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__u64 rip;
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__u64 rdp;
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__u32 mxcsr;
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__u32 mxcsr_mask;
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__u32 st_space[32]; /* 8*16 bytes for each FP-reg */
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__u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg */
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__u32 reserved2[12];
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union {
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__u32 reserved3[12];
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struct _fpx_sw_bytes sw_reserved; /* represents the extended
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* state information */
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};
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};
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#ifdef __KERNEL__
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struct sigcontext {
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unsigned long r8;
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unsigned long r9;
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unsigned long r10;
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unsigned long r11;
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unsigned long r12;
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unsigned long r13;
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unsigned long r14;
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unsigned long r15;
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unsigned long di;
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unsigned long si;
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unsigned long bp;
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unsigned long bx;
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unsigned long dx;
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unsigned long ax;
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unsigned long cx;
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unsigned long sp;
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unsigned long ip;
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unsigned long flags;
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unsigned short cs;
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unsigned short gs;
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unsigned short fs;
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unsigned short __pad0;
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unsigned long err;
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unsigned long trapno;
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unsigned long oldmask;
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unsigned long cr2;
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/*
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* fpstate is really (struct _fpstate *) or (struct _xstate *)
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* depending on the FP_XSTATE_MAGIC1 encoded in the SW reserved
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* bytes of (struct _fpstate) and FP_XSTATE_MAGIC2 present at the end
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* of extended memory layout. See comments at the defintion of
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* (struct _fpx_sw_bytes)
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*/
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void __user *fpstate; /* zero when no FPU/extended context */
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unsigned long reserved1[8];
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};
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#else /* __KERNEL__ */
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/*
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* User-space might still rely on the old definition:
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*/
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struct sigcontext {
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unsigned long r8;
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unsigned long r9;
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unsigned long r10;
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unsigned long r11;
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unsigned long r12;
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unsigned long r13;
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unsigned long r14;
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unsigned long r15;
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unsigned long rdi;
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unsigned long rsi;
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unsigned long rbp;
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unsigned long rbx;
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unsigned long rdx;
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unsigned long rax;
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unsigned long rcx;
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unsigned long rsp;
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unsigned long rip;
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unsigned long eflags; /* RFLAGS */
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unsigned short cs;
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unsigned short gs;
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unsigned short fs;
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unsigned short __pad0;
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unsigned long err;
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unsigned long trapno;
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unsigned long oldmask;
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unsigned long cr2;
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struct _fpstate __user *fpstate; /* zero when no FPU context */
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unsigned long reserved1[8];
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};
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#endif /* !__KERNEL__ */
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#endif /* !__i386__ */
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struct _xsave_hdr {
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__u64 xstate_bv;
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__u64 reserved1[2];
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__u64 reserved2[5];
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};
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struct _ymmh_state {
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/* 16 * 16 bytes for each YMMH-reg */
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__u32 ymmh_space[64];
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};
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/*
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* Extended state pointed by the fpstate pointer in the sigcontext.
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* In addition to the fpstate, information encoded in the xstate_hdr
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* indicates the presence of other extended state information
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* supported by the processor and OS.
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*/
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struct _xstate {
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struct _fpstate fpstate;
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struct _xsave_hdr xstate_hdr;
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struct _ymmh_state ymmh;
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/* new processor state extensions go here */
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};
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#endif /* _ASM_X86_SIGCONTEXT_H */
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