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comparison src/proc.h @ 0:83c23a36980d

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author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Fri, 26 May 2017 23:11:05 +0900
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children a5ccbc210ff8
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-1:000000000000 0:83c23a36980d
1 #ifndef PROC_INCLUDE_
2 #define PROC_INCLUDE_
3
4 // Per-CPU state, now we only support one CPU
5 struct cpu {
6 uchar id; // index into cpus[] below
7 struct context* scheduler; // swtch() here to enter scheduler
8 volatile uint started; // Has the CPU started?
9
10 int ncli; // Depth of pushcli nesting.
11 int intena; // Were interrupts enabled before pushcli?
12
13 // Cpu-local storage variables; see below
14 struct cpu* cpu;
15 struct proc* proc; // The currently-running process.
16 };
17
18 extern struct cpu cpus[NCPU];
19 extern int ncpu;
20
21
22 extern struct cpu* cpu;
23 extern struct proc* proc;
24
25 //PAGEBREAK: 17
26 // Saved registers for kernel context switches. The context switcher
27 // needs to save the callee save register, as usually. For ARM, it is
28 // also necessary to save the banked sp (r13) and lr (r14) registers.
29 // There is, however, no need to save the user space pc (r15) because
30 // pc has been saved on the stack somewhere. We only include it here
31 // for debugging purpose. It will not be restored for the next process.
32 // According to ARM calling convension, r0-r3 is caller saved. We do
33 // not need to save sp_svc, as it will be saved in the pcb, neither
34 // pc_svc, as it will be always be the same value.
35 //
36 // Keep it in sync with swtch.S
37 //
38 struct context {
39 // svc mode registers
40 uint r4;
41 uint r5;
42 uint r6;
43 uint r7;
44 uint r8;
45 uint r9;
46 uint r10;
47 uint r11;
48 uint r12;
49 uint lr;
50 };
51
52
53 enum procstate { UNUSED, EMBRYO, SLEEPING, RUNNABLE, RUNNING, ZOMBIE };
54
55 // Per-process state
56 struct proc {
57 uint sz; // Size of process memory (bytes)
58 pde_t* pgdir; // Page table
59 char* kstack; // Bottom of kernel stack for this process
60 enum procstate state; // Process state
61 volatile int pid; // Process ID
62 struct proc* parent; // Parent process
63 struct trapframe* tf; // Trap frame for current syscall
64 struct context* context; // swtch() here to run process
65 void* chan; // If non-zero, sleeping on chan
66 int killed; // If non-zero, have been killed
67 struct file* ofile[NOFILE]; // Open files
68 struct inode* cwd; // Current directory
69 char name[16]; // Process name (debugging)
70 };
71
72 // Process memory is laid out contiguously, low addresses first:
73 // text
74 // original data and bss
75 // fixed-size stack
76 // expandable heap
77 #endif