8148b6ee53
nesting cli/sti: release shouldn't always enable interrupts separate setup of lapic from starting of other cpus, so cpu() works earlier flag to disable locking in console output make locks work even when curproc==0 (still crashes in clock interrupt)
126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
#include "types.h"
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#include "param.h"
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#include "mmu.h"
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#include "proc.h"
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#include "defs.h"
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#include "x86.h"
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#include "traps.h"
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#include "syscall.h"
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#include "elf.h"
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#include "param.h"
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#include "spinlock.h"
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extern char edata[], end[];
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extern int acpu;
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extern char _binary_user1_start[], _binary_user1_size[];
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extern char _binary_usertests_start[], _binary_usertests_size[];
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extern char _binary_userfs_start[], _binary_userfs_size[];
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extern use_printf_lock;
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int
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main()
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{
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struct proc *p;
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if (acpu) {
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cpus[cpu()].clis = 1;
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cprintf("an application processor\n");
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idtinit(); // CPU's idt
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lapic_init(cpu());
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lapic_timerinit();
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lapic_enableintr();
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sti();
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scheduler();
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}
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acpu = 1;
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// clear BSS
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memset(edata, 0, end - edata);
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mp_init(); // just set up apic so cpu() works
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use_printf_lock = 1;
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cpus[cpu()].clis = 1; // cpu starts as if we had called cli()
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cprintf("\nxV6\n\n");
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pic_init(); // initialize PIC
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kinit(); // physical memory allocator
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tvinit(); // trap vectors
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idtinit(); // CPU's idt
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// create fake process zero
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p = &proc[0];
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memset(p, 0, sizeof *p);
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p->state = WAITING;
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p->sz = 4 * PAGE;
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p->mem = kalloc(p->sz);
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memset(p->mem, 0, p->sz);
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p->kstack = kalloc(KSTACKSIZE);
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p->tf = (struct Trapframe *) (p->kstack + KSTACKSIZE - sizeof(struct Trapframe));
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memset(p->tf, 0, sizeof(struct Trapframe));
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p->tf->tf_es = p->tf->tf_ds = p->tf->tf_ss = (SEG_UDATA << 3) | 3;
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p->tf->tf_cs = (SEG_UCODE << 3) | 3;
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p->tf->tf_eflags = FL_IF;
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p->pid = 0;
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p->ppid = 0;
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setupsegs(p);
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mp_startthem();
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// turn on timer and enable interrupts on the local APIC
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lapic_timerinit();
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lapic_enableintr();
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// init disk device
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//ide_init();
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// become interruptable
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sti();
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p = newproc();
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load_icode(p, _binary_usertests_start, (unsigned) _binary_usertests_size);
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//load_icode(p, _binary_userfs_start, (unsigned) _binary_userfs_size);
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p->state = RUNNABLE;
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cprintf("loaded userfs\n");
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scheduler();
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return 0;
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}
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void
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load_icode(struct proc *p, uint8_t *binary, unsigned size)
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{
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int i;
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struct Elf *elf;
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struct Proghdr *ph;
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// Check magic number on binary
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elf = (struct Elf*) binary;
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cprintf("elf %x magic %x\n", elf, elf->e_magic);
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if (elf->e_magic != ELF_MAGIC)
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panic("load_icode: not an ELF binary");
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p->tf->tf_eip = elf->e_entry;
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p->tf->tf_esp = p->sz;
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// Map and load segments as directed.
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ph = (struct Proghdr*) (binary + elf->e_phoff);
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for (i = 0; i < elf->e_phnum; i++, ph++) {
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if (ph->p_type != ELF_PROG_LOAD)
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continue;
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cprintf("va %x memsz %d\n", ph->p_va, ph->p_memsz);
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if (ph->p_va + ph->p_memsz < ph->p_va)
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panic("load_icode: overflow in elf header segment");
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if (ph->p_va + ph->p_memsz >= p->sz)
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panic("load_icode: icode wants to be above UTOP");
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// Load/clear the segment
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memcpy(p->mem + ph->p_va, binary + ph->p_offset, ph->p_filesz);
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memset(p->mem + ph->p_va + ph->p_filesz, 0, ph->p_memsz - ph->p_filesz);
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}
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}
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