86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
/*
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* Copyright (c) 2019 Intel Corporation
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/kernel.h>
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#include <ksched.h>
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#include <zephyr/kernel_structs.h>
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#include <kernel_internal.h>
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#include <offsets_short.h>
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#include <x86_mmu.h>
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extern void x86_sse_init(struct k_thread *thread); /* in locore.S */
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/* FIXME: This exists to make space for a "return address" at the top
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* of the stack. Obviously this is unused at runtime, but is required
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* for alignment: stacks at runtime should be 16-byte aligned, and a
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* CALL will therefore push a return address that leaves the stack
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* misaligned. Effectively we're wasting 8 bytes here to undo (!) the
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* alignment that the upper level code already tried to do for us. We
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* should clean this up.
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*/
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struct x86_initial_frame {
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/* zeroed return address for ABI */
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uint64_t rip;
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};
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void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
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char *stack_ptr, k_thread_entry_t entry,
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void *p1, void *p2, void *p3)
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{
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void *switch_entry;
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struct x86_initial_frame *iframe;
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#if defined(CONFIG_X86_STACK_PROTECTION) && !defined(CONFIG_THREAD_STACK_MEM_MAPPED)
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/* This unconditionally set the first page of stack as guard page,
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* which is only needed if the stack is not memory mapped.
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*/
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z_x86_set_stack_guard(stack);
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#else
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ARG_UNUSED(stack);
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#endif
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#ifdef CONFIG_USERSPACE
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switch_entry = z_x86_userspace_prepare_thread(thread);
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thread->arch.cs = X86_KERNEL_CS;
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thread->arch.ss = X86_KERNEL_DS;
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#else
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switch_entry = z_thread_entry;
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#endif
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iframe = Z_STACK_PTR_TO_FRAME(struct x86_initial_frame, stack_ptr);
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iframe->rip = 0U;
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thread->callee_saved.rsp = (long) iframe;
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thread->callee_saved.rip = (long) switch_entry;
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thread->callee_saved.rflags = EFLAGS_INITIAL;
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/* Parameters to entry point, which is populated in
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* thread->callee_saved.rip
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*/
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thread->arch.rdi = (long) entry;
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thread->arch.rsi = (long) p1;
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thread->arch.rdx = (long) p2;
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thread->arch.rcx = (long) p3;
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x86_sse_init(thread);
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thread->arch.flags = X86_THREAD_FLAG_ALL;
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thread->switch_handle = thread;
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}
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int arch_float_disable(struct k_thread *thread)
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{
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/* x86-64 always has FP/SSE enabled so cannot be disabled */
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ARG_UNUSED(thread);
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return -ENOTSUP;
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}
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int arch_float_enable(struct k_thread *thread, unsigned int options)
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{
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/* x86-64 always has FP/SSE enabled so nothing to do here */
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ARG_UNUSED(thread);
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ARG_UNUSED(options);
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return 0;
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}
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