Imbus/xv6-riscv-kernel
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-MD and TRAPFRAME

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This commit is contained in:
Robert Morris 2019-07-22 14:54:40 -04:00
parent 5eab649255
commit 6b379e4707
5 changed files with 18 additions and 13 deletions
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6
kernel/proc.c
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@ -156,8 +156,8 @@ proc_pagetable(struct proc *p)
mappages(pagetable, TRAMPOLINE, PGSIZE,
(uint64)trampout, PTE_R | PTE_X);
// map the trapframe, for trampoline.S.
mappages(pagetable, (TRAMPOLINE - PGSIZE), PGSIZE,
// map the trapframe just below TRAMPOLINE, for trampoline.S.
mappages(pagetable, TRAPFRAME, PGSIZE,
(uint64)(p->tf), PTE_R | PTE_W);
return pagetable;
@ -169,7 +169,7 @@ void
proc_freepagetable(pagetable_t pagetable, uint64 sz)
{
unmappages(pagetable, TRAMPOLINE, PGSIZE, 0);
unmappages(pagetable, TRAMPOLINE-PGSIZE, PGSIZE, 0);
unmappages(pagetable, TRAPFRAME, PGSIZE, 0);
if(sz > 0)
uvmfree(pagetable, sz);
}