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200
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1 #include "../../context.h"
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206
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2 #include "mmu.h"
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3 #include "memlayout.h"
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200
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4 #interface "vm_impl.h"
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5
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206
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6 /*
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7 vm_impl* createvm_impl2();
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8 */
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9
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10 __code loaduvm_ptesize_checkvm_impl(struct vm_impl* vm_impl, __code next(...)) {
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11
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12 if ((uint) vm_impl->addr %PTE_SZ != 0) {
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13 // goto panic
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14 }
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15
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16 goto loaduvm_loopvm_impl(vm_impl, next(...));
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200
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17 }
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18
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206
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19 __code loaduvm_loopvm_impl(struct vm_impl* vm_impl, __code next(...)) {
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20
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21 if (vm_impl->i < vm_impl->sz) {
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22 goto loaduvm_check_pgdir(vm_impl, next(...));
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23 }
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24 goto loaduvm_exit(vm_impl, next(...));
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200
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25 }
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206
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26 static pte_t* walkpgdir (pde_t *pgdir, const void *va, int alloc)
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27 {
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28 pde_t *pde;
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29 pte_t *pgtab;
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30
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31 // pgdir points to the page directory, get the page direcotry entry (pde)
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32 pde = &pgdir[PDE_IDX(va)];
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33
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34 if (*pde & PE_TYPES) {
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35 pgtab = (pte_t*) p2v(PT_ADDR(*pde));
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36
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37 } else {
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38 if (!alloc || (pgtab = (pte_t*) kpt_alloc()) == 0) {
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39 return 0;
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40 }
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41
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42 // Make sure all those PTE_P bits are zero.
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43 memset(pgtab, 0, PT_SZ);
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44
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45 // The permissions here are overly generous, but they can
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46 // be further restricted by the permissions in the page table
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47 // entries, if necessary.
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48 *pde = v2p(pgtab) | UPDE_TYPE;
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49 }
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50
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51 return &pgtab[PTE_IDX(va)];
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52 }
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53
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54
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55 __code loaduvm_check_pgdir(struct vm_impl* vm_impl, __code next(...)) {
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56 if ((vm_impl->pte = walkpgdir(vm_impl->pgdir, vm_impl->addr + vm_impl->i, 0)) == 0) {
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57 // goto panic
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58 }
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59 vm_impl->pa = PTE_ADDR(*vm_impl->pte);
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60
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61 goto loaduvm_check_PTE_SZ(vm_impl, next(...));
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62 }
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63
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64 __code loaduvm_check_PTE_SZ(struct vm_impl* vm_impl, __code next(...)) {
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65 goto loaduvm_exit(vm_impl, next(...));
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66 }
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67
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68 __code loaduvm_exit(struct vm_impl* vm_impl, __code next(...)) {
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69
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70 goto next(...);
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71 }
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