[deliverable/linux.git] / arch / arm / mm / idmap.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();
}
Commit	Line	Data
614dd058 RK	1	#include <linux/kernel.h>
	2
	3	#include <asm/cputype.h>
	4	#include <asm/pgalloc.h>
	5	#include <asm/pgtable.h>
	6
516295e5	7	static void idmap_add_pmd(pud_t *pud, unsigned long addr, unsigned long end,
af3813d6 RK	8	unsigned long prot)
af3813d6 RK	9	{
516295e5	10	pmd_t *pmd = pmd_offset(pud, addr);
af3813d6 RK	11
	12	addr = (addr & PMD_MASK) \| prot;
	13	pmd[0] = __pmd(addr);
	14	addr += SECTION_SIZE;
	15	pmd[1] = __pmd(addr);
	16	flush_pmd_entry(pmd);
	17	}
	18
516295e5 RK	19	static void idmap_add_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
	20	unsigned long prot)
	21	{
	22	pud_t *pud = pud_offset(pgd, addr);
	23	unsigned long next;
	24
	25	do {
	26	next = pud_addr_end(addr, end);
	27	idmap_add_pmd(pud, addr, next, prot);
	28	} while (pud++, addr = next, addr != end);
	29	}
	30
614dd058 RK	31	void identity_mapping_add(pgd_t *pgd, unsigned long addr, unsigned long end)
614dd058 RK	32	{
af3813d6	33	unsigned long prot, next;
614dd058 RK	34
	35	prot = PMD_TYPE_SECT \| PMD_SECT_AP_WRITE;
	36	if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale())
	37	prot \|= PMD_BIT4;
	38
af3813d6 RK	39	pgd += pgd_index(addr);
	40	do {
	41	next = pgd_addr_end(addr, end);
516295e5	42	idmap_add_pud(pgd, addr, next, prot);
af3813d6	43	} while (pgd++, addr = next, addr != end);
614dd058 RK	44	}
	45
	46	#ifdef CONFIG_SMP
516295e5	47	static void idmap_del_pmd(pud_t *pud, unsigned long addr, unsigned long end)
af3813d6	48	{
516295e5	49	pmd_t *pmd = pmd_offset(pud, addr);
af3813d6 RK	50	pmd_clear(pmd);
	51	}
	52
516295e5 RK	53	static void idmap_del_pud(pgd_t *pgd, unsigned long addr, unsigned long end)
	54	{
	55	pud_t *pud = pud_offset(pgd, addr);
	56	unsigned long next;
	57
	58	do {
	59	next = pud_addr_end(addr, end);
	60	idmap_del_pmd(pud, addr, next);
	61	} while (pud++, addr = next, addr != end);
	62	}
	63
614dd058 RK	64	void identity_mapping_del(pgd_t *pgd, unsigned long addr, unsigned long end)
614dd058 RK	65	{
af3813d6 RK	66	unsigned long next;
	67
	68	pgd += pgd_index(addr);
	69	do {
	70	next = pgd_addr_end(addr, end);
516295e5	71	idmap_del_pud(pgd, addr, next);
af3813d6	72	} while (pgd++, addr = next, addr != end);
614dd058 RK	73	}
	74	#endif
	75
	76	/*
	77	* In order to soft-boot, we need to insert a 1:1 mapping in place of
	78	* the user-mode pages. This will then ensure that we have predictable
	79	* results when turning the mmu off
	80	*/
	81	void setup_mm_for_reboot(char mode)
	82	{
	83	/*
	84	* We need to access to user-mode page tables here. For kernel threads
	85	* we don't have any user-mode mappings so we use the context that we
	86	* "borrowed".
	87	*/
	88	identity_mapping_add(current->active_mm->pgd, 0, TASK_SIZE);
	89	local_flush_tlb_all();
	90	}