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annotate include/proc.h @ 0:c450faca55f4

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author Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
date Sun, 22 Oct 2017 18:25:39 +0900
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Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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1 /*****************************************************************
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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2 * proc.h
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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3 * adapted from MIT xv6 by Zhiyi Huang, hzy@cs.otago.ac.nz
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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4 * University of Otago
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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5 *
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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6 ********************************************************************/
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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7
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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8
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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9
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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10 // Segments in proc->gdt.
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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11 #define NSEGS 7
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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12
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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13 // Per-CPU state
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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14 struct cpu {
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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15 uchar id; // Local APIC ID; index into cpus[] below
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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16 struct context *scheduler; // swtch() here to enter scheduler
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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17 volatile uint started; // Has the CPU started?
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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18 int ncli; // Depth of pushcli nesting.
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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19 int intena; // Were interrupts enabled before pushcli?
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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20
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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21 // Cpu-local storage variables; see below
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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22 struct cpu *cpu;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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23 struct proc *proc; // The currently-running process.
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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24 };
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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25
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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26 struct cpu cpus[NCPU];
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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27 //extern int ncpu;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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28
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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29 // Per-CPU variables, holding pointers to the
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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30 // current cpu and to the current process.
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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31 // The asm suffix tells gcc to use "%gs:0" to refer to cpu
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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32 // and "%gs:4" to refer to proc. seginit sets up the
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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33 // %gs segment register so that %gs refers to the memory
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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34 // holding those two variables in the local cpu's struct cpu.
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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35 // This is similar to how thread-local variables are implemented
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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36 // in thread libraries such as Linux pthreads.
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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37 //extern struct cpu *cpu asm("%gs:0"); // &cpus[cpunum()]
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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38 //extern struct proc *proc asm("%gs:4"); // cpus[cpunum()].proc
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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39
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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40 #define curr_cpu (&cpus[0])
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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41 #define curr_proc (cpus[0].proc)
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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42
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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43 //PAGEBREAK: 17
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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44 // Saved registers for kernel context switches.
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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45 // Don't need to save all the segment registers (%cs, etc),
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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46 // because they are constant across kernel contexts.
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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47 // Don't need to save %eax, %ecx, %edx, because the
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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48 // x86 convention is that the caller has saved them.
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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49 // Contexts are stored at the bottom of the stack they
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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50 // describe; the stack pointer is the address of the context.
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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51 // The layout of the context matches the layout of the stack in swtch.S
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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52 // at the "Switch stacks" comment. Switch doesn't save eip explicitly,
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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53 // but it is on the stack and allocproc() manipulates it.
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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54 struct context {
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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55 uint r4;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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56 uint r5;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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57 uint r6;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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58 uint r7;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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59 uint r8;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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60 uint r9;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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61 uint r10;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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62 uint r11;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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63 uint r12;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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64 uint lr;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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65 uint pc;
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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66 };
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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67
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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68 enum procstate { UNUSED=0, EMBRYO, SLEEPING, RUNNABLE, RUNNING, ZOMBIE };
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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69
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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70 // Per-process state
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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71 struct proc {
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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72 uint sz; // Size of process memory (bytes)
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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73 pde_t* pgdir; // Page table
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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74 char *kstack; // Bottom of kernel stack for this process
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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75 enum procstate state; // Process state
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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76 volatile int pid; // Process ID
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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77 struct proc *parent; // Parent process
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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78 struct trapframe *tf; // Trap frame for current syscall
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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79 struct context *context; // swtch() here to run process
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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80 void *chan; // If non-zero, sleeping on chan
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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81 int killed; // If non-zero, have been killed
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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82 struct file *ofile[NOFILE]; // Open files
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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83 struct inode *cwd; // Current directory
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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84 char name[16]; // Process name (debugging)
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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85 };
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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86
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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87 // Process memory is laid out contiguously, low addresses first:
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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88 // text
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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89 // original data and bss
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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90 // fixed-size stack
Tatsuki IHA <innparusu@cr.ie.u-ryukyu.ac.jp>
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91 // expandable heap