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Diffstat (limited to 'ANDROID_3.4.5/arch/x86/mm/dump_pagetables.c')
-rw-r--r--ANDROID_3.4.5/arch/x86/mm/dump_pagetables.c375
1 files changed, 0 insertions, 375 deletions
diff --git a/ANDROID_3.4.5/arch/x86/mm/dump_pagetables.c b/ANDROID_3.4.5/arch/x86/mm/dump_pagetables.c
deleted file mode 100644
index 0002a3a3..00000000
--- a/ANDROID_3.4.5/arch/x86/mm/dump_pagetables.c
+++ /dev/null
@@ -1,375 +0,0 @@
-/*
- * Debug helper to dump the current kernel pagetables of the system
- * so that we can see what the various memory ranges are set to.
- *
- * (C) Copyright 2008 Intel Corporation
- *
- * Author: Arjan van de Ven <arjan@linux.intel.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; version 2
- * of the License.
- */
-
-#include <linux/debugfs.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/seq_file.h>
-
-#include <asm/pgtable.h>
-
-/*
- * The dumper groups pagetable entries of the same type into one, and for
- * that it needs to keep some state when walking, and flush this state
- * when a "break" in the continuity is found.
- */
-struct pg_state {
- int level;
- pgprot_t current_prot;
- unsigned long start_address;
- unsigned long current_address;
- const struct addr_marker *marker;
-};
-
-struct addr_marker {
- unsigned long start_address;
- const char *name;
-};
-
-/* indices for address_markers; keep sync'd w/ address_markers below */
-enum address_markers_idx {
- USER_SPACE_NR = 0,
-#ifdef CONFIG_X86_64
- KERNEL_SPACE_NR,
- LOW_KERNEL_NR,
- VMALLOC_START_NR,
- VMEMMAP_START_NR,
- HIGH_KERNEL_NR,
- MODULES_VADDR_NR,
- MODULES_END_NR,
-#else
- KERNEL_SPACE_NR,
- VMALLOC_START_NR,
- VMALLOC_END_NR,
-# ifdef CONFIG_HIGHMEM
- PKMAP_BASE_NR,
-# endif
- FIXADDR_START_NR,
-#endif
-};
-
-/* Address space markers hints */
-static struct addr_marker address_markers[] = {
- { 0, "User Space" },
-#ifdef CONFIG_X86_64
- { 0x8000000000000000UL, "Kernel Space" },
- { PAGE_OFFSET, "Low Kernel Mapping" },
- { VMALLOC_START, "vmalloc() Area" },
- { VMEMMAP_START, "Vmemmap" },
- { __START_KERNEL_map, "High Kernel Mapping" },
- { MODULES_VADDR, "Modules" },
- { MODULES_END, "End Modules" },
-#else
- { PAGE_OFFSET, "Kernel Mapping" },
- { 0/* VMALLOC_START */, "vmalloc() Area" },
- { 0/*VMALLOC_END*/, "vmalloc() End" },
-# ifdef CONFIG_HIGHMEM
- { 0/*PKMAP_BASE*/, "Persisent kmap() Area" },
-# endif
- { 0/*FIXADDR_START*/, "Fixmap Area" },
-#endif
- { -1, NULL } /* End of list */
-};
-
-/* Multipliers for offsets within the PTEs */
-#define PTE_LEVEL_MULT (PAGE_SIZE)
-#define PMD_LEVEL_MULT (PTRS_PER_PTE * PTE_LEVEL_MULT)
-#define PUD_LEVEL_MULT (PTRS_PER_PMD * PMD_LEVEL_MULT)
-#define PGD_LEVEL_MULT (PTRS_PER_PUD * PUD_LEVEL_MULT)
-
-/*
- * Print a readable form of a pgprot_t to the seq_file
- */
-static void printk_prot(struct seq_file *m, pgprot_t prot, int level)
-{
- pgprotval_t pr = pgprot_val(prot);
- static const char * const level_name[] =
- { "cr3", "pgd", "pud", "pmd", "pte" };
-
- if (!pgprot_val(prot)) {
- /* Not present */
- seq_printf(m, " ");
- } else {
- if (pr & _PAGE_USER)
- seq_printf(m, "USR ");
- else
- seq_printf(m, " ");
- if (pr & _PAGE_RW)
- seq_printf(m, "RW ");
- else
- seq_printf(m, "ro ");
- if (pr & _PAGE_PWT)
- seq_printf(m, "PWT ");
- else
- seq_printf(m, " ");
- if (pr & _PAGE_PCD)
- seq_printf(m, "PCD ");
- else
- seq_printf(m, " ");
-
- /* Bit 9 has a different meaning on level 3 vs 4 */
- if (level <= 3) {
- if (pr & _PAGE_PSE)
- seq_printf(m, "PSE ");
- else
- seq_printf(m, " ");
- } else {
- if (pr & _PAGE_PAT)
- seq_printf(m, "pat ");
- else
- seq_printf(m, " ");
- }
- if (pr & _PAGE_GLOBAL)
- seq_printf(m, "GLB ");
- else
- seq_printf(m, " ");
- if (pr & _PAGE_NX)
- seq_printf(m, "NX ");
- else
- seq_printf(m, "x ");
- }
- seq_printf(m, "%s\n", level_name[level]);
-}
-
-/*
- * On 64 bits, sign-extend the 48 bit address to 64 bit
- */
-static unsigned long normalize_addr(unsigned long u)
-{
-#ifdef CONFIG_X86_64
- return (signed long)(u << 16) >> 16;
-#else
- return u;
-#endif
-}
-
-/*
- * This function gets called on a break in a continuous series
- * of PTE entries; the next one is different so we need to
- * print what we collected so far.
- */
-static void note_page(struct seq_file *m, struct pg_state *st,
- pgprot_t new_prot, int level)
-{
- pgprotval_t prot, cur;
- static const char units[] = "KMGTPE";
-
- /*
- * If we have a "break" in the series, we need to flush the state that
- * we have now. "break" is either changing perms, levels or
- * address space marker.
- */
- prot = pgprot_val(new_prot) & PTE_FLAGS_MASK;
- cur = pgprot_val(st->current_prot) & PTE_FLAGS_MASK;
-
- if (!st->level) {
- /* First entry */
- st->current_prot = new_prot;
- st->level = level;
- st->marker = address_markers;
- seq_printf(m, "---[ %s ]---\n", st->marker->name);
- } else if (prot != cur || level != st->level ||
- st->current_address >= st->marker[1].start_address) {
- const char *unit = units;
- unsigned long delta;
- int width = sizeof(unsigned long) * 2;
-
- /*
- * Now print the actual finished series
- */
- seq_printf(m, "0x%0*lx-0x%0*lx ",
- width, st->start_address,
- width, st->current_address);
-
- delta = (st->current_address - st->start_address) >> 10;
- while (!(delta & 1023) && unit[1]) {
- delta >>= 10;
- unit++;
- }
- seq_printf(m, "%9lu%c ", delta, *unit);
- printk_prot(m, st->current_prot, st->level);
-
- /*
- * We print markers for special areas of address space,
- * such as the start of vmalloc space etc.
- * This helps in the interpretation.
- */
- if (st->current_address >= st->marker[1].start_address) {
- st->marker++;
- seq_printf(m, "---[ %s ]---\n", st->marker->name);
- }
-
- st->start_address = st->current_address;
- st->current_prot = new_prot;
- st->level = level;
- }
-}
-
-static void walk_pte_level(struct seq_file *m, struct pg_state *st, pmd_t addr,
- unsigned long P)
-{
- int i;
- pte_t *start;
-
- start = (pte_t *) pmd_page_vaddr(addr);
- for (i = 0; i < PTRS_PER_PTE; i++) {
- pgprot_t prot = pte_pgprot(*start);
-
- st->current_address = normalize_addr(P + i * PTE_LEVEL_MULT);
- note_page(m, st, prot, 4);
- start++;
- }
-}
-
-#if PTRS_PER_PMD > 1
-
-static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pud_t addr,
- unsigned long P)
-{
- int i;
- pmd_t *start;
-
- start = (pmd_t *) pud_page_vaddr(addr);
- for (i = 0; i < PTRS_PER_PMD; i++) {
- st->current_address = normalize_addr(P + i * PMD_LEVEL_MULT);
- if (!pmd_none(*start)) {
- pgprotval_t prot = pmd_val(*start) & PTE_FLAGS_MASK;
-
- if (pmd_large(*start) || !pmd_present(*start))
- note_page(m, st, __pgprot(prot), 3);
- else
- walk_pte_level(m, st, *start,
- P + i * PMD_LEVEL_MULT);
- } else
- note_page(m, st, __pgprot(0), 3);
- start++;
- }
-}
-
-#else
-#define walk_pmd_level(m,s,a,p) walk_pte_level(m,s,__pmd(pud_val(a)),p)
-#define pud_large(a) pmd_large(__pmd(pud_val(a)))
-#define pud_none(a) pmd_none(__pmd(pud_val(a)))
-#endif
-
-#if PTRS_PER_PUD > 1
-
-static void walk_pud_level(struct seq_file *m, struct pg_state *st, pgd_t addr,
- unsigned long P)
-{
- int i;
- pud_t *start;
-
- start = (pud_t *) pgd_page_vaddr(addr);
-
- for (i = 0; i < PTRS_PER_PUD; i++) {
- st->current_address = normalize_addr(P + i * PUD_LEVEL_MULT);
- if (!pud_none(*start)) {
- pgprotval_t prot = pud_val(*start) & PTE_FLAGS_MASK;
-
- if (pud_large(*start) || !pud_present(*start))
- note_page(m, st, __pgprot(prot), 2);
- else
- walk_pmd_level(m, st, *start,
- P + i * PUD_LEVEL_MULT);
- } else
- note_page(m, st, __pgprot(0), 2);
-
- start++;
- }
-}
-
-#else
-#define walk_pud_level(m,s,a,p) walk_pmd_level(m,s,__pud(pgd_val(a)),p)
-#define pgd_large(a) pud_large(__pud(pgd_val(a)))
-#define pgd_none(a) pud_none(__pud(pgd_val(a)))
-#endif
-
-static void walk_pgd_level(struct seq_file *m)
-{
-#ifdef CONFIG_X86_64
- pgd_t *start = (pgd_t *) &init_level4_pgt;
-#else
- pgd_t *start = swapper_pg_dir;
-#endif
- int i;
- struct pg_state st;
-
- memset(&st, 0, sizeof(st));
-
- for (i = 0; i < PTRS_PER_PGD; i++) {
- st.current_address = normalize_addr(i * PGD_LEVEL_MULT);
- if (!pgd_none(*start)) {
- pgprotval_t prot = pgd_val(*start) & PTE_FLAGS_MASK;
-
- if (pgd_large(*start) || !pgd_present(*start))
- note_page(m, &st, __pgprot(prot), 1);
- else
- walk_pud_level(m, &st, *start,
- i * PGD_LEVEL_MULT);
- } else
- note_page(m, &st, __pgprot(0), 1);
-
- start++;
- }
-
- /* Flush out the last page */
- st.current_address = normalize_addr(PTRS_PER_PGD*PGD_LEVEL_MULT);
- note_page(m, &st, __pgprot(0), 0);
-}
-
-static int ptdump_show(struct seq_file *m, void *v)
-{
- walk_pgd_level(m);
- return 0;
-}
-
-static int ptdump_open(struct inode *inode, struct file *filp)
-{
- return single_open(filp, ptdump_show, NULL);
-}
-
-static const struct file_operations ptdump_fops = {
- .open = ptdump_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int pt_dump_init(void)
-{
- struct dentry *pe;
-
-#ifdef CONFIG_X86_32
- /* Not a compile-time constant on x86-32 */
- address_markers[VMALLOC_START_NR].start_address = VMALLOC_START;
- address_markers[VMALLOC_END_NR].start_address = VMALLOC_END;
-# ifdef CONFIG_HIGHMEM
- address_markers[PKMAP_BASE_NR].start_address = PKMAP_BASE;
-# endif
- address_markers[FIXADDR_START_NR].start_address = FIXADDR_START;
-#endif
-
- pe = debugfs_create_file("kernel_page_tables", 0600, NULL, NULL,
- &ptdump_fops);
- if (!pe)
- return -ENOMEM;
-
- return 0;
-}
-
-__initcall(pt_dump_init);
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
-MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables");
generated by cgit (git 2.34.1) at 2025-01-25 19:51:39 +0000