| /* Intel x86 GCC specific kernel inline assembler functions and macros */ |
| |
| /* |
| * Copyright (c) 2015, Wind River Systems, Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef _ASM_INLINE_GCC_H |
| #define _ASM_INLINE_GCC_H |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* |
| * The file must not be included directly |
| * Include asm_inline.h instead |
| */ |
| |
| #ifdef _ASMLANGUAGE |
| |
| #define SYS_NANO_CPU_EXC_CONNECT(handler, vector) \ |
| NANO_CPU_EXC_CONNECT_NO_ERR(handler, vector, 0) |
| |
| #else /* !_ASMLANGUAGE */ |
| |
| /** |
| * |
| * @brief Return the current value of the EFLAGS register |
| * |
| * @return the EFLAGS register. |
| */ |
| static inline unsigned int EflagsGet(void) |
| { |
| unsigned int eflags; /* EFLAGS register contents */ |
| |
| __asm__ volatile( |
| "pushfl;\n\t" |
| "popl %0;\n\t" |
| : "=r"(eflags) |
| : ); |
| |
| return eflags; |
| } |
| |
| |
| #ifdef CONFIG_FP_SHARING |
| |
| /** |
| * |
| * @brief Disallow use of floating point capabilities |
| * |
| * This routine sets CR0[TS] to 1, which disallows the use of FP instructions |
| * by the currently executing thread. |
| * |
| * @return N/A |
| */ |
| static inline void _FpAccessDisable(void) |
| { |
| void *tempReg; |
| |
| __asm__ volatile( |
| "movl %%cr0, %0;\n\t" |
| "orl $0x8, %0;\n\t" |
| "movl %0, %%cr0;\n\t" |
| : "=r"(tempReg) |
| : |
| : "memory"); |
| } |
| |
| |
| /** |
| * |
| * @brief Save non-integer context information |
| * |
| * This routine saves the system's "live" non-integer context into the |
| * specified area. If the specified task or fiber supports SSE then |
| * x87/MMX/SSEx thread info is saved, otherwise only x87/MMX thread is saved. |
| * Function is invoked by _FpCtxSave(struct tcs *tcs) |
| * |
| * @return N/A |
| */ |
| static inline void _do_fp_ctx_save(int flags, void *preemp_float_reg) |
| { |
| #ifdef CONFIG_SSE |
| if (flags) { |
| __asm__ volatile("fxsave (%0);\n\t" |
| : |
| : "r"(preemp_float_reg) |
| : "memory"); |
| } else |
| #else |
| ARG_UNUSED(flags); |
| #endif /* CONFIG_SSE */ |
| { |
| __asm__ volatile("fnsave (%0);\n\t" |
| : |
| : "r"(preemp_float_reg) |
| : "memory"); |
| } |
| } |
| |
| /** |
| * |
| * @brief Initialize non-integer context information |
| * |
| * This routine initializes the system's "live" non-integer context. |
| * Function is invoked by _FpCtxInit(struct tcs *tcs) |
| * |
| * @return N/A |
| */ |
| static inline void _do_fp_ctx_init(int flags) |
| { |
| /* initialize x87 FPU */ |
| __asm__ volatile("fninit\n\t"); |
| |
| |
| #ifdef CONFIG_SSE |
| if (flags) { |
| /* initialize SSE (since thread uses it) */ |
| __asm__ volatile("ldmxcsr _sse_mxcsr_default_value\n\t"); |
| |
| } |
| #else |
| ARG_UNUSED(flags); |
| #endif /* CONFIG_SSE */ |
| } |
| |
| #endif /* CONFIG_FP_SHARING */ |
| |
| #endif /* _ASMLANGUAGE */ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _ASM_INLINE_GCC_H */ |