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bugfix:修复当使用sched()运行调度器，在切换进程的时候，由于不在中断上下文内，导致当前进程的上下文丢失的问题。 (#130)
bugfix:修复当使用sched()运行调度器，在切换进程的时候，由于不在中断上下文内，导致当前进程的上下文丢失的问题。 bugfix:修复切换进程的宏的汇编代码的损坏部分，未声明rax寄存器，从而导致的编译器未定义行为问题。
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@ -513,7 +513,7 @@ ul initial_kernel_thread(ul arg)
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// kdebug("current_pcb->thread->rsp=%#018lx", current_pcb->thread->rsp);
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current_pcb->flags = 0;
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// 将返回用户层的代码压入堆栈，向rdx传入regs的地址，然后jmp到do_execve这个系统调用api的处理函数
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// 这里的设计思路和switch_proc类似 加载用户态程序：shell.elf
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// 这里的设计思路和switch_to类似 加载用户态程序：shell.elf
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__asm__ __volatile__("movq %1, %%rsp \n\t"
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"pushq %2 \n\t"
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"jmp do_execve \n\t" ::"D"(current_pcb->thread->rsp),
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@ -51,23 +51,23 @@ extern uint64_t process_exit_files(struct process_control_block *pcb);
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* 然后调用__switch_to切换栈，配置其他信息，最后恢复下一个进程的rax rbp。
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*/
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#define switch_proc(prev, next) \
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#define switch_to(prev, next) \
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do \
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{ \
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__asm__ __volatile__("pushq %%rbp \n\t" \
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"pushq %%rax \n\t" \
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"movq %%rsp, %0 \n\t" \
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"movq %2, %%rsp \n\t" \
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"leaq switch_proc_ret_addr(%%rip), %%rax \n\t" \
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"leaq 2f(%%rip), %%rax \n\t" \
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"movq %%rax, %1 \n\t" \
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"pushq %3 \n\t" \
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"jmp __switch_to \n\t" \
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"switch_proc_ret_addr: \n\t" \
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"2: \n\t" \
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"popq %%rax \n\t" \
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"popq %%rbp \n\t" \
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: "=m"(prev->thread->rsp), "=m"(prev->thread->rip) \
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: "m"(next->thread->rsp), "m"(next->thread->rip), "D"(prev), "S"(next) \
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: "memory"); \
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: "memory", "rax"); \
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} while (0)
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/**
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@ -1,7 +1,7 @@
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#include "cfs.h"
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#include <common/kprint.h>
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#include <driver/video/video.h>
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#include <common/spinlock.h>
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#include <driver/video/video.h>
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struct sched_queue_t sched_cfs_ready_queue[MAX_CPU_NUM]; // 就绪队列
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@ -18,7 +18,8 @@ struct process_control_block *sched_cfs_dequeue()
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return &initial_proc_union.pcb;
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}
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struct process_control_block *proc = container_of(list_next(&sched_cfs_ready_queue[proc_current_cpu_id].proc_queue.list), struct process_control_block, list);
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struct process_control_block *proc = container_of(
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list_next(&sched_cfs_ready_queue[proc_current_cpu_id].proc_queue.list), struct process_control_block, list);
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list_del(&proc->list);
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--sched_cfs_ready_queue[proc_current_cpu_id].count;
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@ -34,7 +35,8 @@ void sched_cfs_enqueue(struct process_control_block *pcb)
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{
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if (pcb == initial_proc[proc_current_cpu_id])
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return;
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struct process_control_block *proc = container_of(list_next(&sched_cfs_ready_queue[proc_current_cpu_id].proc_queue.list), struct process_control_block, list);
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struct process_control_block *proc = container_of(
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list_next(&sched_cfs_ready_queue[proc_current_cpu_id].proc_queue.list), struct process_control_block, list);
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if ((list_empty(&sched_cfs_ready_queue[proc_current_cpu_id].proc_queue.list)) == 0)
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{
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while (proc->virtual_runtime < pcb->virtual_runtime)
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@ -58,12 +60,16 @@ void sched_cfs()
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current_pcb->flags &= ~PF_NEED_SCHED;
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// kdebug("current_pcb pid= %d", current_pcb->pid);
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struct process_control_block *proc = sched_cfs_dequeue();
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// kdebug("sched_cfs_ready_queue[proc_current_cpu_id].count = %d", sched_cfs_ready_queue[proc_current_cpu_id].count);
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if (current_pcb->virtual_runtime >= proc->virtual_runtime || !(current_pcb->state & PROC_RUNNING)) // 当前进程运行时间大于了下一进程的运行时间，进行切换
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// kdebug("sched_cfs_ready_queue[proc_current_cpu_id].count = %d",
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// sched_cfs_ready_queue[proc_current_cpu_id].count);
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if (current_pcb->virtual_runtime >= proc->virtual_runtime ||
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!(current_pcb->state & PROC_RUNNING)) // 当前进程运行时间大于了下一进程的运行时间，进行切换
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{
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// kdebug("current_pcb->virtual_runtime = %d,proc->vt= %d", current_pcb->virtual_runtime, proc->virtual_runtime);
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if (current_pcb->state & PROC_RUNNING) // 本次切换由于时间片到期引发，则再次加入就绪队列，否则交由其它功能模块进行管理
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// kdebug("current_pcb->virtual_runtime = %d,proc->vt= %d", current_pcb->virtual_runtime,
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// proc->virtual_runtime);
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if (current_pcb->state &
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PROC_RUNNING) // 本次切换由于时间片到期引发，则再次加入就绪队列，否则交由其它功能模块进行管理
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sched_cfs_enqueue(current_pcb);
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// kdebug("proc->pid=%d, count=%d", proc->pid, sched_cfs_ready_queue[proc_current_cpu_id].count);
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if (sched_cfs_ready_queue[proc_current_cpu_id].cpu_exec_proc_jiffies <= 0)
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@ -72,18 +78,20 @@ void sched_cfs()
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{
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case 0:
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case 1:
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sched_cfs_ready_queue[proc_current_cpu_id].cpu_exec_proc_jiffies = 4 / sched_cfs_ready_queue[proc_current_cpu_id].count;
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sched_cfs_ready_queue[proc_current_cpu_id].cpu_exec_proc_jiffies =
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4 / sched_cfs_ready_queue[proc_current_cpu_id].count;
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break;
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case 2:
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default:
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sched_cfs_ready_queue[proc_current_cpu_id].cpu_exec_proc_jiffies = (4 / sched_cfs_ready_queue[proc_current_cpu_id].count) << 2;
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sched_cfs_ready_queue[proc_current_cpu_id].cpu_exec_proc_jiffies =
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(4 / sched_cfs_ready_queue[proc_current_cpu_id].count) << 2;
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break;
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}
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}
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process_switch_mm(proc);
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barrier();
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switch_proc(current_pcb, proc);
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barrier();
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}
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else // 不进行切换
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{
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@ -96,12 +104,14 @@ void sched_cfs()
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{
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case 0:
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case 1:
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sched_cfs_ready_queue[proc_current_cpu_id].cpu_exec_proc_jiffies = 4 / sched_cfs_ready_queue[proc_current_cpu_id].count;
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sched_cfs_ready_queue[proc_current_cpu_id].cpu_exec_proc_jiffies =
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4 / sched_cfs_ready_queue[proc_current_cpu_id].count;
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break;
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case 2:
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default:
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sched_cfs_ready_queue[proc_current_cpu_id].cpu_exec_proc_jiffies = (4 / sched_cfs_ready_queue[proc_current_cpu_id].count) << 2;
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sched_cfs_ready_queue[proc_current_cpu_id].cpu_exec_proc_jiffies =
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(4 / sched_cfs_ready_queue[proc_current_cpu_id].count) << 2;
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break;
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}
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}
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@ -1,9 +1,9 @@
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#include "sched.h"
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#include <common/kprint.h>
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#include <common/spinlock.h>
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#include <common/string.h>
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#include <driver/video/video.h>
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#include <sched/cfs.h>
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#include <common/string.h>
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/**
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* @brief
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@ -60,10 +60,10 @@ void sched_enqueue(struct process_control_block *pcb)
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}
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/**
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* @brief 包裹sched_cfs(),调度函数
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* @brief 该函数只能由sys_sched调用
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*
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*/
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void sched()
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static void __sched()
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{
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sched_cfs();
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}
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@ -73,5 +73,23 @@ void sched_init()
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sched_cfs_init();
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}
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uint64_t sys_sched(struct pt_regs *regs)
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{
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if(user_mode(regs)){
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return -EPERM;
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}
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__sched();
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}
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void sched()
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{
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enter_syscall_int(SYS_SCHED, 0, 0, 0, 0, 0, 0, 0, 0);
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}
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void switch_proc(struct process_control_block *prev, struct process_control_block *proc)
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{
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process_switch_mm(proc);
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io_mfence();
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switch_to(prev, proc);
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}
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@ -77,3 +77,4 @@ void sched_init();
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*/
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void sched_update_jiffies();
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void switch_proc(struct process_control_block *prev, struct process_control_block *proc);
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@ -23,6 +23,7 @@ extern uint64_t sys_kill(struct pt_regs *regs);
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extern uint64_t sys_sigaction(struct pt_regs * regs);
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extern uint64_t sys_rt_sigreturn(struct pt_regs * regs);
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extern uint64_t sys_getpid(struct pt_regs * regs);
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extern uint64_t sys_sched(struct pt_regs * regs);
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/**
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* @brief 导出系统调用处理函数的符号
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@ -592,6 +593,7 @@ system_call_t system_call_table[MAX_SYSTEM_CALL_NUM] = {
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[24] = sys_sigaction,
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[25] = sys_rt_sigreturn,
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[26] = sys_getpid,
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[27 ... 254] = system_call_not_exists,
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[27] = sys_sched,
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[28 ... 254] = system_call_not_exists,
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[255] = sys_ahci_end_req,
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};
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@ -37,6 +37,7 @@
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#define SYS_KILL 23 // kill一个进程(向这个进程发出信号)
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#define SYS_SIGACTION 24 // 设置进程的信号处理动作
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#define SYS_RT_SIGRETURN 25 // 从信号处理函数返回
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#define SYS_GETPID 26 // 获取当前进程的pid（进程标识符）
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#define SYS_GETPID 26 // 获取当前进程的pid（进程标识符）
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#define SYS_SCHED 27 // 让系统立即运行调度器（该系统调用不能由运行在Ring3的程序发起）
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#define SYS_AHCI_END_REQ 255 // AHCI DMA请求结束end_request的系统调用
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