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For amd64 kernels, repeat the 1GB mapping over the entire address space

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instead of just at 0GB and 1GB marks.  This gives more flexibility for
the choice of KERNBASE.

Approved by:	re (amd64 stuff)
This commit is contained in:
Peter Wemm 2003-05-11 22:42:29 +00:00
parent 5a337b2589
commit 573044a926
1 changed files with 13 additions and 13 deletions
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26
sys/boot/i386/libi386/elf64_freebsd.c
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@ -86,20 +86,20 @@ elf64_exec(struct preloaded_file *fp)
bzero(PT3, PAGE_SIZE);
bzero(PT2, PAGE_SIZE);
/* single PML4 entry */
PT4[0] = (p4_entry_t)VTOP((uintptr_t)&PT3[0]);
PT4[0] |= PG_V | PG_RW | PG_U;
/* Direct map 1GB at address zero */
PT3[0] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]);
PT3[0] |= PG_V | PG_RW | PG_U;
/* Direct map 1GB at KERNBASE (hardcoded for now) */
PT3[1] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]);
PT3[1] |= PG_V | PG_RW | PG_U;
/* 512 PG_PS (2MB) page mappings for 1GB of direct mapping */
/*
* This is kinda brutal, but every single 1GB VM memory segment points to
* the same first 1GB of physical memory. But it is more than adequate.
*/
for (i = 0; i < 512; i++) {
/* Each slot of the level 4 pages points to the same level 3 page */
PT4[i] = (p4_entry_t)VTOP((uintptr_t)&PT3[0]);
PT4[i] |= PG_V | PG_RW | PG_U;
/* Each slot of the level 3 pages points to the same level 2 page */
PT3[i] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]);
PT3[i] |= PG_V | PG_RW | PG_U;
/* The level 2 page slots are mapped with 2MB pages for 1GB. */
PT2[i] = i * (2 * 1024 * 1024);
PT2[i] |= PG_V | PG_RW | PG_PS | PG_U;
}