fpu.h

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/* SPDX-License-Identifier: GPL-2.0 */
 
#ifndef __KVM_FPU_H_
#define __KVM_FPU_H_
 
#include <asm/fpu/api.h>
 
typedef u32     __attribute__((vector_size(16))) sse128_t;
#define __sse128_u  union { sse128_t vec; u64 as_u64[2]; u32 as_u32[4]; }
#define sse128_lo(x)    ({ __sse128_u t; t.vec = x; t.as_u64[0]; })
#define sse128_hi(x)    ({ __sse128_u t; t.vec = x; t.as_u64[1]; })
#define sse128_l0(x)    ({ __sse128_u t; t.vec = x; t.as_u32[0]; })
#define sse128_l1(x)    ({ __sse128_u t; t.vec = x; t.as_u32[1]; })
#define sse128_l2(x)    ({ __sse128_u t; t.vec = x; t.as_u32[2]; })
#define sse128_l3(x)    ({ __sse128_u t; t.vec = x; t.as_u32[3]; })
#define sse128(lo, hi)  ({ __sse128_u t; t.as_u64[0] = lo; t.as_u64[1] = hi; t.vec; })
 
static inline void _kvm_read_sse_reg(int reg, sse128_t *data)
{
    switch (reg) {
    case 0: asm("movdqa %%xmm0, %0" : "=m"(*data)); break;
    case 1: asm("movdqa %%xmm1, %0" : "=m"(*data)); break;
    case 2: asm("movdqa %%xmm2, %0" : "=m"(*data)); break;
    case 3: asm("movdqa %%xmm3, %0" : "=m"(*data)); break;
    case 4: asm("movdqa %%xmm4, %0" : "=m"(*data)); break;
    case 5: asm("movdqa %%xmm5, %0" : "=m"(*data)); break;
    case 6: asm("movdqa %%xmm6, %0" : "=m"(*data)); break;
    case 7: asm("movdqa %%xmm7, %0" : "=m"(*data)); break;
#ifdef CONFIG_X86_64
    case 8: asm("movdqa %%xmm8, %0" : "=m"(*data)); break;
    case 9: asm("movdqa %%xmm9, %0" : "=m"(*data)); break;
    case 10: asm("movdqa %%xmm10, %0" : "=m"(*data)); break;
    case 11: asm("movdqa %%xmm11, %0" : "=m"(*data)); break;
    case 12: asm("movdqa %%xmm12, %0" : "=m"(*data)); break;
    case 13: asm("movdqa %%xmm13, %0" : "=m"(*data)); break;
    case 14: asm("movdqa %%xmm14, %0" : "=m"(*data)); break;
    case 15: asm("movdqa %%xmm15, %0" : "=m"(*data)); break;
#endif
    default: BUG();
    }
}
 
static inline void _kvm_write_sse_reg(int reg, const sse128_t *data)
{
    switch (reg) {
    case 0: asm("movdqa %0, %%xmm0" : : "m"(*data)); break;
    case 1: asm("movdqa %0, %%xmm1" : : "m"(*data)); break;
    case 2: asm("movdqa %0, %%xmm2" : : "m"(*data)); break;
    case 3: asm("movdqa %0, %%xmm3" : : "m"(*data)); break;
    case 4: asm("movdqa %0, %%xmm4" : : "m"(*data)); break;
    case 5: asm("movdqa %0, %%xmm5" : : "m"(*data)); break;
    case 6: asm("movdqa %0, %%xmm6" : : "m"(*data)); break;
    case 7: asm("movdqa %0, %%xmm7" : : "m"(*data)); break;
#ifdef CONFIG_X86_64
    case 8: asm("movdqa %0, %%xmm8" : : "m"(*data)); break;
    case 9: asm("movdqa %0, %%xmm9" : : "m"(*data)); break;
    case 10: asm("movdqa %0, %%xmm10" : : "m"(*data)); break;
    case 11: asm("movdqa %0, %%xmm11" : : "m"(*data)); break;
    case 12: asm("movdqa %0, %%xmm12" : : "m"(*data)); break;
    case 13: asm("movdqa %0, %%xmm13" : : "m"(*data)); break;
    case 14: asm("movdqa %0, %%xmm14" : : "m"(*data)); break;
    case 15: asm("movdqa %0, %%xmm15" : : "m"(*data)); break;
#endif
    default: BUG();
    }
}
 
static inline void _kvm_read_mmx_reg(int reg, u64 *data)
{
    switch (reg) {
    case 0: asm("movq %%mm0, %0" : "=m"(*data)); break;
    case 1: asm("movq %%mm1, %0" : "=m"(*data)); break;
    case 2: asm("movq %%mm2, %0" : "=m"(*data)); break;
    case 3: asm("movq %%mm3, %0" : "=m"(*data)); break;
    case 4: asm("movq %%mm4, %0" : "=m"(*data)); break;
    case 5: asm("movq %%mm5, %0" : "=m"(*data)); break;
    case 6: asm("movq %%mm6, %0" : "=m"(*data)); break;
    case 7: asm("movq %%mm7, %0" : "=m"(*data)); break;
    default: BUG();
    }
}
 
static inline void _kvm_write_mmx_reg(int reg, const u64 *data)
{
    switch (reg) {
    case 0: asm("movq %0, %%mm0" : : "m"(*data)); break;
    case 1: asm("movq %0, %%mm1" : : "m"(*data)); break;
    case 2: asm("movq %0, %%mm2" : : "m"(*data)); break;
    case 3: asm("movq %0, %%mm3" : : "m"(*data)); break;
    case 4: asm("movq %0, %%mm4" : : "m"(*data)); break;
    case 5: asm("movq %0, %%mm5" : : "m"(*data)); break;
    case 6: asm("movq %0, %%mm6" : : "m"(*data)); break;
    case 7: asm("movq %0, %%mm7" : : "m"(*data)); break;
    default: BUG();
    }
}
 
static inline void kvm_fpu_get(void)
{
    fpregs_lock();
 
    fpregs_assert_state_consistent();
    if (test_thread_flag(TIF_NEED_FPU_LOAD))
        switch_fpu_return();
}
 
static inline void kvm_fpu_put(void)
{
    fpregs_unlock();
}
 
static inline void kvm_read_sse_reg(int reg, sse128_t *data)
{
    kvm_fpu_get();
    _kvm_read_sse_reg(reg, data);
    kvm_fpu_put();
}
 
static inline void kvm_write_sse_reg(int reg, const sse128_t *data)
{
    kvm_fpu_get();
    _kvm_write_sse_reg(reg, data);
    kvm_fpu_put();
}
 
static inline void kvm_read_mmx_reg(int reg, u64 *data)
{
    kvm_fpu_get();
    _kvm_read_mmx_reg(reg, data);
    kvm_fpu_put();
}
 
static inline void kvm_write_mmx_reg(int reg, const u64 *data)
{
    kvm_fpu_get();
    _kvm_write_mmx_reg(reg, data);
    kvm_fpu_put();
}
 
#endif