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