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arch/x86: add SSE floating-point to Intel64 subarch

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This is a naive implementation which does "eager" context switching
for floating-point context, which, of course, introduces performance
concerns. Other approaches have security concerns, SMP implications,
and impact the x86 arch and Zephyr project as a whole. Discussion is
needed, so punting with the straightforward solution for now.

Signed-off-by: Charles E. Youse <charles.youse@intel.com>
This commit is contained in:
Charles E. Youse 2019-07-24 11:40:24 -07:00 • committed by Andrew Boie
commit a5eea17dda
7 changed files with 67 additions and 3 deletions
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4
arch/x86/core/intel64/thread.c
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@ -8,6 +8,8 @@
#include <kernel_structs.h>
#include <kernel_internal.h>
extern void x86_sse_init(struct k_thread *); /* in locore.S */
void z_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
size_t stack_size, k_thread_entry_t entry,
void *parameter1, void *parameter2, void *parameter3,
@ -26,4 +28,6 @@ void z_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
thread->arch.rsi = (long) parameter1;
thread->arch.rdx = (long) parameter2;
thread->arch.rcx = (long) parameter3;
x86_sse_init(thread);
}