| /** |
| * @file |
| * @brief Intel x86 GCC specific floating point register macros |
| */ |
| |
| /* |
| * Copyright (c) 2015, Wind River Systems, Inc. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #ifndef _FLOAT_REGS_X86_GCC_H |
| #define _FLOAT_REGS_X86_GCC_H |
| |
| #if !defined(__GNUC__) || !defined(CONFIG_ISA_IA32) |
| #error __FILE__ goes only with x86 GCC |
| #endif |
| |
| #include <toolchain.h> |
| #include "float_context.h" |
| |
| /** |
| * |
| * @brief Load all floating point registers |
| * |
| * This function loads ALL floating point registers pointed to by @a regs. |
| * It is expected that a subsequent call to _store_all_float_registers() |
| * will be issued to dump the floating point registers to memory. |
| * |
| * The format/organization of 'struct fp_register_set'; the generic C test |
| * code (main.c) merely treat the register set as an array of bytes. |
| * |
| * The only requirement is that the arch specific implementations of |
| * _load_all_float_registers(), _store_all_float_registers() and |
| * _load_then_store_all_float_registers() agree on the format. |
| * |
| * @return N/A |
| */ |
| |
| static inline void _load_all_float_registers(struct fp_register_set *regs) |
| { |
| __asm__ volatile ( |
| "movdqu 0(%0), %%xmm0\n\t;" |
| "movdqu 16(%0), %%xmm1\n\t;" |
| "movdqu 32(%0), %%xmm2\n\t;" |
| "movdqu 48(%0), %%xmm3\n\t;" |
| "movdqu 64(%0), %%xmm4\n\t;" |
| "movdqu 80(%0), %%xmm5\n\t;" |
| "movdqu 96(%0), %%xmm6\n\t;" |
| "movdqu 112(%0), %%xmm7\n\t;" |
| |
| "fldt 128(%0)\n\t;" |
| "fldt 138(%0)\n\t;" |
| "fldt 148(%0)\n\t;" |
| "fldt 158(%0)\n\t;" |
| "fldt 168(%0)\n\t;" |
| "fldt 178(%0)\n\t;" |
| "fldt 188(%0)\n\t;" |
| "fldt 198(%0)\n\t;" |
| |
| : : "r" (regs) |
| ); |
| } |
| |
| |
| /** |
| * |
| * @brief Load then dump all float registers to memory |
| * |
| * This function loads ALL floating point registers from the memory buffer |
| * specified by @a regs, and then stores them back to that buffer. |
| * |
| * This routine is called by a high priority thread prior to calling a primitive |
| * that pends and triggers a co-operative context switch to a low priority |
| * thread. Because the kernel doesn't save floating point context for |
| * co-operative context switches, the x87 FPU register stack must be put back |
| * in an empty state before the switch occurs in case the next task to perform |
| * floating point operations was also co-operatively switched out and simply |
| * inherits the existing x87 FPU state (expecting the stack to be empty). |
| * |
| * @return N/A |
| */ |
| |
| static inline void |
| _load_then_store_all_float_registers(struct fp_register_set *regs) |
| { |
| __asm__ volatile ( |
| "movdqu 0(%0), %%xmm0\n\t;" |
| "movdqu 16(%0), %%xmm1\n\t;" |
| "movdqu 32(%0), %%xmm2\n\t;" |
| "movdqu 48(%0), %%xmm3\n\t;" |
| "movdqu 64(%0), %%xmm4\n\t;" |
| "movdqu 80(%0), %%xmm5\n\t;" |
| "movdqu 96(%0), %%xmm6\n\t;" |
| "movdqu 112(%0), %%xmm7\n\t;" |
| |
| "fldt 128(%0)\n\t;" |
| "fldt 138(%0)\n\t;" |
| "fldt 148(%0)\n\t;" |
| "fldt 158(%0)\n\t;" |
| "fldt 168(%0)\n\t;" |
| "fldt 178(%0)\n\t;" |
| "fldt 188(%0)\n\t;" |
| "fldt 198(%0)\n\t;" |
| |
| /* pop the x87 FPU registers back to memory */ |
| |
| "fstpt 198(%0)\n\t;" |
| "fstpt 188(%0)\n\t;" |
| "fstpt 178(%0)\n\t;" |
| "fstpt 168(%0)\n\t;" |
| "fstpt 158(%0)\n\t;" |
| "fstpt 148(%0)\n\t;" |
| "fstpt 138(%0)\n\t;" |
| "fstpt 128(%0)\n\t;" |
| |
| : : "r" (regs) |
| ); |
| } |
| |
| |
| /** |
| * |
| * @brief Dump all floating point registers to memory |
| * |
| * This function stores ALL floating point registers to the memory buffer |
| * specified by @a regs. It is expected that a previous invocation of |
| * _load_all_float_registers() occurred to load all the floating point |
| * registers from a memory buffer. |
| * |
| * @return N/A |
| */ |
| |
| static inline void _store_all_float_registers(struct fp_register_set *regs) |
| { |
| __asm__ volatile ( |
| "movdqu %%xmm0, 0(%0)\n\t;" |
| "movdqu %%xmm1, 16(%0)\n\t;" |
| "movdqu %%xmm2, 32(%0)\n\t;" |
| "movdqu %%xmm3, 48(%0)\n\t;" |
| "movdqu %%xmm4, 64(%0)\n\t;" |
| "movdqu %%xmm5, 80(%0)\n\t;" |
| "movdqu %%xmm6, 96(%0)\n\t;" |
| "movdqu %%xmm7, 112(%0)\n\t;" |
| |
| "fstpt 198(%0)\n\t;" |
| "fstpt 188(%0)\n\t;" |
| "fstpt 178(%0)\n\t;" |
| "fstpt 168(%0)\n\t;" |
| "fstpt 158(%0)\n\t;" |
| "fstpt 148(%0)\n\t;" |
| "fstpt 138(%0)\n\t;" |
| "fstpt 128(%0)\n\t;" |
| |
| : : "r" (regs) : "memory" |
| ); |
| } |
| #endif /* _FLOAT_REGS_X86_GCC_H */ |