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x86: improve page table printouts

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We now show:

 - Data pages that are paged out in red
 - Pages that are mapped but non-present due to KPTI,
   respectively in cyan or blue if they are identity mapped
   or not.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2020-12-10 10:07:02 -08:00 • committed by Anas Nashif
commit 905e6d52a7
1 changed files with 29 additions and 2 deletions
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31
arch/x86/core/x86_mmu.c
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@ -466,7 +466,8 @@ static char get_entry_code(pentry_t value)
{
char ret;
if ((value & MMU_P) == 0U) {
if (value == 0U) {
/* Unmapped entry */
ret = '.';
} else {
if ((value & MMU_RW) != 0U) {
@ -519,10 +520,36 @@ static void print_entries(pentry_t entries_array[], uint8_t *base, int level,
COLOR(GREEN);
}
} else {
/* Intermediate entry */
COLOR(MAGENTA);
}
} else {
COLOR(GREY);
if (is_leaf(level, entry)) {
if (entry == 0U) {
/* Unmapped */
COLOR(GREY);
#ifdef CONFIG_X86_KPTI
} else if (is_flipped_pte(entry)) {
/* KPTI, un-flip it */
COLOR(BLUE);
entry = ~entry;
phys = get_entry_phys(entry, level);
if (phys == virt) {
/* Identity mapped */
COLOR(CYAN);
} else {
/* Non-identity mapped */
COLOR(BLUE);
}
#endif
} else {
/* Paged out */
COLOR(RED);
}
} else {
/* Un-mapped intermediate entry */
COLOR(GREY);
}
}
printk("%c", get_entry_code(entry));