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Bare metal: fix some issues in initial page table creation

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hello4.com now works outside of an emulator.
This commit is contained in:
tkchia 2022-09-11 14:56:54 +00:00
parent 816a71bfa0
commit 577c0f6226
2 changed files with 10 additions and 3 deletions
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10
libc/intrin/mman.greg.c
View file

@ -74,6 +74,10 @@ noasan textreal uint64_t *__get_virtual(struct mman *mm, uint64_t *t,
if (!(*e & PAGE_V)) {
if (!maketables) return NULL;
if (!(p = __new_page(mm))) return NULL;
if (mm->use_bane)
__clear_page(BANE + p);
else
__clear_page(p);
*e = p | PAGE_V | PAGE_RW;
}
t = (uint64_t *)(BANE + (*e & PAGE_TA));
@ -117,16 +121,18 @@ static noasan textreal void __invert_memory(struct mman *mm, uint64_t *pml4t) {
uint64_t i, j, *m, p, pe;
for (i = 0; i < mm->e820n; ++i) {
for (p = mm->e820[i].addr, pe = mm->e820[i].addr + mm->e820[i].size;
p + 0x200000 < pe; p += 4096) {
p != pe + 0x200000; p += 4096) {
m = __get_virtual(mm, pml4t, BANE + p, true);
if (m && !(*m & PAGE_V)) {
*m = p | PAGE_V | PAGE_RW;
}
}
mm->use_bane = 1;
}
}
noasan textreal void __setup_mman(struct mman *mm, uint64_t *pml4t) {
mm->use_bane = 0;
__normalize_e820(mm);
__invert_memory(mm, pml4t);
}
@ -150,7 +156,7 @@ noasan textreal void __map_phdrs(struct mman *mm, uint64_t *pml4t, uint64_t b) {
v = b + p->p_offset + i;
m = MAX(m, v);
} else {
v = __clear_page(__new_page(mm));
v = __clear_page(BANE + __new_page(mm));
}
*__get_virtual(mm, pml4t, p->p_vaddr + i, true) = (v & PAGE_TA) | f;
}

3
libc/runtime/mman.internal.h
View file

@ -7,7 +7,7 @@ COSMOPOLITAN_C_START_
struct mman {
int64_t pdp; /* 0x0500 */
int32_t pdpi; /* 0x0508 */
int32_t e820n; /* 0x050a */
int32_t e820n; /* 0x050c */
struct SmapEntry e820[256]; /* 0x0510 */
char pc_drive_base_table[11]; /* 0x1d10 */
unsigned char pc_drive_type; /* 0x1d1b */
@ -17,6 +17,7 @@ struct mman {
unsigned char pc_drive_last_head; /* 0x1d20 */
unsigned char pc_drive; /* 0x1d21 */
char bad_idt[6]; /* 0x1d22 */
unsigned use_bane : 1, : 31; /* 0x1d28 */
};
COSMOPOLITAN_C_END_