| /* |
| * Copyright (c) 2010-2015 Wind River Systems, Inc. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /** |
| * @file |
| * @brief Thread support primitives |
| * |
| * This module provides core thread related primitives for the IA-32 |
| * processor architecture. |
| */ |
| |
| #include <kernel.h> |
| #include <ksched.h> |
| #include <arch/x86/mmustructs.h> |
| |
| /* forward declaration */ |
| |
| /* Initial thread stack frame, such that everything is laid out as expected |
| * for when z_swap() switches to it for the first time. |
| */ |
| struct _x86_initial_frame { |
| u32_t swap_retval; |
| u32_t ebp; |
| u32_t ebx; |
| u32_t esi; |
| u32_t edi; |
| void *thread_entry; |
| u32_t eflags; |
| k_thread_entry_t entry; |
| void *p1; |
| void *p2; |
| void *p3; |
| }; |
| |
| #ifdef CONFIG_X86_USERSPACE |
| /* Implemented in userspace.S */ |
| extern void z_x86_syscall_entry_stub(void); |
| |
| /* Syscalls invoked by 'int 0x80'. Installed in the IDT at DPL=3 so that |
| * userspace can invoke it. |
| */ |
| NANO_CPU_INT_REGISTER(z_x86_syscall_entry_stub, -1, -1, 0x80, 3); |
| #endif /* CONFIG_X86_USERSPACE */ |
| |
| #if defined(CONFIG_FLOAT) && defined(CONFIG_FP_SHARING) |
| |
| extern int z_float_disable(struct k_thread *thread); |
| |
| int arch_float_disable(struct k_thread *thread) |
| { |
| #if defined(CONFIG_LAZY_FP_SHARING) |
| return z_float_disable(thread); |
| #else |
| return -ENOSYS; |
| #endif /* CONFIG_LAZY_FP_SHARING */ |
| } |
| #endif /* CONFIG_FLOAT && CONFIG_FP_SHARING */ |
| |
| void arch_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, |
| int priority, unsigned int options) |
| { |
| char *stack_buf; |
| char *stack_high; |
| void *swap_entry; |
| struct _x86_initial_frame *initial_frame; |
| |
| Z_ASSERT_VALID_PRIO(priority, entry); |
| stack_buf = Z_THREAD_STACK_BUFFER(stack); |
| z_new_thread_init(thread, stack_buf, stack_size, priority, options); |
| |
| #if CONFIG_X86_STACK_PROTECTION |
| struct z_x86_thread_stack_header *header = |
| (struct z_x86_thread_stack_header *)stack; |
| |
| /* Set guard area to read-only to catch stack overflows */ |
| z_x86_mmu_set_flags(&z_x86_kernel_ptables, &header->guard_page, |
| MMU_PAGE_SIZE, MMU_ENTRY_READ, Z_X86_MMU_RW, |
| true); |
| #endif |
| |
| #ifdef CONFIG_USERSPACE |
| swap_entry = z_x86_userspace_prepare_thread(thread); |
| #else |
| swap_entry = z_thread_entry; |
| #endif |
| |
| stack_high = (char *)STACK_ROUND_DOWN(stack_buf + stack_size); |
| |
| /* Create an initial context on the stack expected by z_swap() */ |
| initial_frame = (struct _x86_initial_frame *) |
| (stack_high - sizeof(struct _x86_initial_frame)); |
| /* z_thread_entry() arguments */ |
| initial_frame->entry = entry; |
| initial_frame->p1 = parameter1; |
| initial_frame->p2 = parameter2; |
| initial_frame->p3 = parameter3; |
| initial_frame->eflags = EFLAGS_INITIAL; |
| #ifdef _THREAD_WRAPPER_REQUIRED |
| initial_frame->edi = (u32_t)swap_entry; |
| initial_frame->thread_entry = z_x86_thread_entry_wrapper; |
| #else |
| initial_frame->thread_entry = swap_entry; |
| #endif /* _THREAD_WRAPPER_REQUIRED */ |
| |
| /* Remaining _x86_initial_frame members can be garbage, z_thread_entry() |
| * doesn't care about their state when execution begins |
| */ |
| thread->callee_saved.esp = (unsigned long)initial_frame; |
| #if defined(CONFIG_LAZY_FP_SHARING) |
| thread->arch.excNestCount = 0; |
| #endif /* CONFIG_LAZY_FP_SHARING */ |
| thread->arch.flags = 0; |
| } |