Imbus/xv6-riscv-kernel
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nothing much

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This commit is contained in:
Robert Morris 2022-08-09 15:11:25 -04:00
parent dd431c400a
commit 7d8bfdcbe3
5 changed files with 21 additions and 15 deletions
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21
kernel/proc.c
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@ -30,7 +30,8 @@ struct spinlock wait_lock;
// Map it high in memory, followed by an invalid
// guard page.
void
proc_mapstacks(pagetable_t kpgtbl) {
proc_mapstacks(pagetable_t kpgtbl)
{
struct proc *p;
for(p = proc; p < &proc[NPROC]; p++) {
@ -42,7 +43,7 @@ proc_mapstacks(pagetable_t kpgtbl) {
}
}
// initialize the proc table at boot time.
// initialize the proc table.
void
procinit(void)
{
@ -69,7 +70,8 @@ cpuid()
// Return this CPU's cpu struct.
// Interrupts must be disabled.
struct cpu*
mycpu(void) {
mycpu(void)
{
int id = cpuid();
struct cpu *c = &cpus[id];
return c;
@ -77,7 +79,8 @@ mycpu(void) {
// Return the current struct proc *, or zero if none.
struct proc*
myproc(void) {
myproc(void)
{
push_off();
struct cpu *c = mycpu();
struct proc *p = c->proc;
@ -86,7 +89,8 @@ myproc(void) {
}
int
allocpid() {
allocpid()
{
int pid;
acquire(&pid_lock);
@ -210,7 +214,8 @@ proc_freepagetable(pagetable_t pagetable, uint64 sz)
}
// a user program that calls exec("/init")
// od -t xC initcode
// assembled from ../user/initcode.S
// od -t xC ../user/initcode
uchar initcode[] = {
0x17, 0x05, 0x00, 0x00, 0x13, 0x05, 0x45, 0x02,
0x97, 0x05, 0x00, 0x00, 0x93, 0x85, 0x35, 0x02,
@ -230,9 +235,9 @@ userinit(void)
p = allocproc();
initproc = p;
// allocate one user page and copy init's instructions
// allocate one user page and copy initcode's instructions
// and data into it.
uvminit(p->pagetable, initcode, sizeof(initcode));
uvmfirst(p->pagetable, initcode, sizeof(initcode));
p->sz = PGSIZE;
// prepare for the very first "return" from kernel to user.