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generated by cgit v1.2.3 (git 2.25.1) at 2026-01-06 00:01:53 +0000
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/*
 *  linux/arch/i386/kernel/i387.c
 *
 *  Copyright (C) 1994 Linus Torvalds
 *
 *  Pentium III FXSR, SSE support
 *  General FPU state handling cleanups
 *  Gareth Hughes <gareth@valinux.com>, May 2000
 */

#include <xen/config.h>
#include <xen/sched.h>
#include <asm/current.h>
#include <asm/processor.h>
#include <asm/hvm/support.h>
#include <asm/i387.h>
#include <asm/xstate.h>
#include <asm/asm_defns.h>

static void fpu_init(void)
{
    unsigned long val;
    
    asm volatile ( "fninit" );
    if ( cpu_has_xmm )
    {
        /* load default value into MXCSR control/status register */
        val = MXCSR_DEFAULT;
        asm volatile ( "ldmxcsr %0" : : "m" (val) );
    }
}

/*******************************/
/*     FPU Restore Functions   */
/*******************************/
/* Restore x87 extended state */
static inline void fpu_xrstor(struct vcpu *v, uint64_t mask)
{
    /*
     * XCR0 normally represents what guest OS set. In case of Xen itself, 
     * we set all supported feature mask before doing save/restore.
     */
    set_xcr0(v->arch.xcr0_accum);
    xrstor(v, mask);
    set_xcr0(v->arch.xcr0);
}

/* Restor x87 FPU, MMX, SSE and SSE2 state */
static inline void fpu_fxrstor(struct vcpu *v)
{
    const char *fpu_ctxt = v->arch.fpu_ctxt;

    /*
     * FXRSTOR can fault if passed a corrupted data block. We handle this
     * possibility, which may occur if the block was passed to us by control
     * tools, by silently clearing the block.
     */
    asm volatile (
#ifdef __i386__
        "1: fxrstor %0            \n"
#else /* __x86_64__ */
        /* See above for why the operands/constraints are this way. */
        "1: " REX64_PREFIX "fxrstor (%2)\n"
#endif
        ".section .fixup,\"ax\"   \n"
        "2: push %%"__OP"ax       \n"
        "   push %%"__OP"cx       \n"
        "   push %%"__OP"di       \n"
        "   lea  %0,%%"__OP"di    \n"
        "   mov  %1,%%ecx         \n"
        "   xor  %%eax,%%eax      \n"
        "   rep ; stosl           \n"
        "   pop  %%"__OP"di       \n"
        "   pop  %%"__OP"cx       \n"
        "   pop  %%"__OP"ax       \n"
        "   jmp  1b               \n"
        ".previous                \n"
        _ASM_EXTABLE(1b, 2b)
        : 
        : "m" (*fpu_ctxt),
          "i" (sizeof(v->arch.xsave_area->fpu_sse)/4)
#ifdef __x86_64__
          ,"cdaSDb" (fpu_ctxt)
#endif
        );
}

/* Restore x87 extended state */
static inline void fpu_frstor(struct vcpu *v)
{
    const char *fpu_ctxt = v->arch.fpu_ctxt;

    asm volatile ( "frstor %0" : : "m" (*fpu_ctxt) );
}

/*******************************/
/*      FPU Save Functions     */
/*******************************/
/* Save x87 extended state */
static inline void fpu_xsave(struct vcpu *v)
{
    /* XCR0 normally represents what guest OS set. In case of Xen itself,
     * we set all accumulated feature mask before doing save/restore.
     */
    set_xcr0(v->arch.xcr0_accum);
    xsave(v, v->arch.nonlazy_xstate_used ? XSTATE_ALL : XSTATE_LAZY);