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uCore-Tutorial-Guide-2023S
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Merge pull request #2 from Timothy-LiuXuefeng/main 

Fix some typos of ch4
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Holder Roberts 2022-05-16 23:00:09 +08:00 committed by GitHub
parent 81377f9539 60536a6135
commit 1a6a5647d6
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1 changed files with 10 additions and 4 deletions
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14
source/chapter4/4sv39-implementation-2.rst
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@ -184,12 +184,18 @@ mappages的perm是用于控制页表项的flags的。请注意它具体指向哪
pagetable_t kpgtbl;
kpgtbl = (pagetable_t) kalloc();
memset(kpgtbl, 0, PGSIZE);
mappages(kpgtbl, KERNBASE, KERNBASE, (uint64) e_text - KERNBASE, PTE_R | PTE_X);
mappages(kpgtbl, (uint64) e_text, (uint64) e_text, PHYSTOP - (uint64) e_text, PTE_R | PTE_W);
mappages(kpgtbl, TRAMPOLINE, (uint64)trampoline, PGSIZE, PTE_R | PTE_X);
kvmmap(kpgtbl, KERNBASE, KERNBASE, (uint64) e_text - KERNBASE, PTE_R | PTE_X);
kvmmap(kpgtbl, (uint64) e_text, (uint64) e_text, PHYSTOP - (uint64) e_text, PTE_R | PTE_W);
kvmmap(kpgtbl, TRAMPOLINE, (uint64)trampoline, PGSIZE, PTE_R | PTE_X);
return kpgtbl;
}
void kvmmap(pagetable_t kpgtbl, uint64 va, uint64 pa, uint64 sz, int perm)
{
if (mappages(kpgtbl, va, sz, pa, perm) != 0)
panic("kvmmap");
}
用户页表的加载
-----------------------------------
@ -265,4 +271,4 @@ mappages的perm是用于控制页表项的flags的。请注意它具体指向哪
#define TRAMPOLINE (USER_TOP - PGSIZE)
#define TRAPFRAME (TRAMPOLINE - PGSIZE)
这与为何要这么设定，留给读者思考。
至于为何要这么设定，留给读者思考。