sys_arch_protect() is only required if your port is supporting an operating system. - void sys_arch_unprotect(sys_prot_t pval) This optional function does a "fast" set of critical region protection to the value specified by pval. See the documentation for sys_arch_protect() for more info...
sys_arch1.4.0官方说明 LwIP1.4.0 sys_arch说明 davidhaas 1.7 sys_arch interface for lwIP 0.6++ likewise 1.1 Author: Adam Dunkels The operating system emulation layer provides a common interface between the lwIP code and the underlying operating system kernel. The general idea is ...
(new_page, vma->vm_page_prot); if (write_access) { entry = pte_mkwrite(pte_mkdirty(entry)); } else if (page_count(new_page) > 1 && !(vma->vm_flags & VM_SHARED)) entry = pte_wrprotect(entry); set_pte(page_table, entry); update_mmu_cache(vma, address, entry); return ...
28* avoid namespace conflicts 29* @class_mutex - mutex to protect the children, devices, and interfaces lists. 30* @class - pointer back to the struct class that this structure is associated 31* with. 32* 33* This structure is the one that is the actual kobject allowing struct 34* bu...
(unsigned long)start_rodata, section_size, PAGE_KERNEL); #endif } static inline void protect_memory(void) { #if IS_ENABLED(CONFIG_X86) || IS_ENABLED(CONFIG_X86_64) #if LINUX_VERSION_CODE > KERNEL_VERSION(4, 16, 0) write_cr0_forced(cr0); #else write_cr0(cr0); #endif #elif ...
- sys_prot_t sys_arch_protect(void)? ? ?这个可选的函数快速的(fast)产生一个临界区(critical region)保护(protection)并返回之前保护的等级。这个函数仅在每个很短的临界区中调用。对于支持 ISR-based 驱动的嵌入式系统可能希望通过禁止中断方式实现这个函数。基于任务的系统可能希望通过使用互拆锁(mutex)或...
开门见山,在arch/arm/kernel/sys_arm.c文件中,有这样三个函数:sys_fork、sys_vfork、sys_clone,它们都是在创建进程,分别对应系统调用fork()、vfork()、clone()。 下面是它们在arm中的函数实现: asmlinkageintsys_fork(structpt_regs*regs){#ifdef CONFIG_MMUreturndo_fork(SIGCHLD,regs->ARM_sp,regs,0,NULL...
The 64-bit Arm architecture (a.k.a. "arm64", "aarch64") defines a large quantity of special system registers. Many of them are inaccessible from userland. When a system register name ends in_EL1, it is accessible only at EL1 (kernel mode). Similarly, system registers in_EL2are acc...
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FPGA-TN-02193-1.4 15 LatticeECP3 sysDSP Usage Guide Technical Note port (reset, clk : in std_logic; dataax, dataay : in std_logic_vector(8 downto 0); dataout : out std_logic_vector (17 downto 0)); end; architecture arch of mult is signal dataax_reg, dataay_reg : std_logic...