91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
#include <linux/kernel.h>
|
|
|
|
#include <asm/cputype.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
static void idmap_add_pmd(pud_t *pud, unsigned long addr, unsigned long end,
|
|
unsigned long prot)
|
|
{
|
|
pmd_t *pmd = pmd_offset(pud, addr);
|
|
|
|
addr = (addr & PMD_MASK) | prot;
|
|
pmd[0] = __pmd(addr);
|
|
addr += SECTION_SIZE;
|
|
pmd[1] = __pmd(addr);
|
|
flush_pmd_entry(pmd);
|
|
}
|
|
|
|
static void idmap_add_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
|
|
unsigned long prot)
|
|
{
|
|
pud_t *pud = pud_offset(pgd, addr);
|
|
unsigned long next;
|
|
|
|
do {
|
|
next = pud_addr_end(addr, end);
|
|
idmap_add_pmd(pud, addr, next, prot);
|
|
} while (pud++, addr = next, addr != end);
|
|
}
|
|
|
|
void identity_mapping_add(pgd_t *pgd, unsigned long addr, unsigned long end)
|
|
{
|
|
unsigned long prot, next;
|
|
|
|
prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE;
|
|
if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale())
|
|
prot |= PMD_BIT4;
|
|
|
|
pgd += pgd_index(addr);
|
|
do {
|
|
next = pgd_addr_end(addr, end);
|
|
idmap_add_pud(pgd, addr, next, prot);
|
|
} while (pgd++, addr = next, addr != end);
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static void idmap_del_pmd(pud_t *pud, unsigned long addr, unsigned long end)
|
|
{
|
|
pmd_t *pmd = pmd_offset(pud, addr);
|
|
pmd_clear(pmd);
|
|
}
|
|
|
|
static void idmap_del_pud(pgd_t *pgd, unsigned long addr, unsigned long end)
|
|
{
|
|
pud_t *pud = pud_offset(pgd, addr);
|
|
unsigned long next;
|
|
|
|
do {
|
|
next = pud_addr_end(addr, end);
|
|
idmap_del_pmd(pud, addr, next);
|
|
} while (pud++, addr = next, addr != end);
|
|
}
|
|
|
|
void identity_mapping_del(pgd_t *pgd, unsigned long addr, unsigned long end)
|
|
{
|
|
unsigned long next;
|
|
|
|
pgd += pgd_index(addr);
|
|
do {
|
|
next = pgd_addr_end(addr, end);
|
|
idmap_del_pud(pgd, addr, next);
|
|
} while (pgd++, addr = next, addr != end);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* In order to soft-boot, we need to insert a 1:1 mapping in place of
|
|
* the user-mode pages. This will then ensure that we have predictable
|
|
* results when turning the mmu off
|
|
*/
|
|
void setup_mm_for_reboot(char mode)
|
|
{
|
|
/*
|
|
* We need to access to user-mode page tables here. For kernel threads
|
|
* we don't have any user-mode mappings so we use the context that we
|
|
* "borrowed".
|
|
*/
|
|
identity_mapping_add(current->active_mm->pgd, 0, TASK_SIZE);
|
|
local_flush_tlb_all();
|
|
}
|