bool "42-bit"
depends on ARM64_64K_PAGES
+config ARM64_VA_BITS_48
+ bool "48-bit"
+ depends on BROKEN
+
endchoice
config ARM64_VA_BITS
int
default 39 if ARM64_VA_BITS_39
default 42 if ARM64_VA_BITS_42
+ default 48 if ARM64_VA_BITS_48
config ARM64_2_LEVELS
def_bool y if ARM64_64K_PAGES && ARM64_VA_BITS_42
config ARM64_3_LEVELS
def_bool y if ARM64_4K_PAGES && ARM64_VA_BITS_39
+config ARM64_4_LEVELS
+ def_bool y if ARM64_4K_PAGES && ARM64_VA_BITS_48
+
config CPU_BIG_ENDIAN
bool "Build big-endian kernel"
help
/*
* The idmap and swapper page tables need some space reserved in the kernel
- * image. Both require a pgd and a next level table to (section) map the
- * kernel. The the swapper also maps the FDT (see __create_page_tables for
+ * image. Both require pgd, pud (4 levels only) and pmd tables to (section)
+ * map the kernel. The swapper also maps the FDT (see __create_page_tables for
* more information).
*/
+#ifdef CONFIG_ARM64_4_LEVELS
+#define SWAPPER_DIR_SIZE (3 * PAGE_SIZE)
+#define IDMAP_DIR_SIZE (3 * PAGE_SIZE)
+#else
#define SWAPPER_DIR_SIZE (2 * PAGE_SIZE)
#define IDMAP_DIR_SIZE (2 * PAGE_SIZE)
+#endif
#ifndef __ASSEMBLY__
#ifdef CONFIG_ARM64_2_LEVELS
#include <asm/pgtable-2level-types.h>
-#else
+#elif defined(CONFIG_ARM64_3_LEVELS)
#include <asm/pgtable-3level-types.h>
+#else
+#include <asm/pgtable-4level-types.h>
#endif
extern void __cpu_clear_user_page(void *p, unsigned long user);
#endif /* CONFIG_ARM64_2_LEVELS */
+#ifdef CONFIG_ARM64_4_LEVELS
+
+static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
+{
+ return (pud_t *)get_zeroed_page(GFP_KERNEL | __GFP_REPEAT);
+}
+
+static inline void pud_free(struct mm_struct *mm, pud_t *pud)
+{
+ BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
+ free_page((unsigned long)pud);
+}
+
+static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
+{
+ set_pgd(pgd, __pgd(__pa(pud) | PUD_TYPE_TABLE));
+}
+
+#endif /* CONFIG_ARM64_4_LEVELS */
+
extern pgd_t *pgd_alloc(struct mm_struct *mm);
extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
#ifdef CONFIG_ARM64_2_LEVELS
#include <asm/pgtable-2level-hwdef.h>
-#else
+#elif defined(CONFIG_ARM64_3_LEVELS)
#include <asm/pgtable-3level-hwdef.h>
+#else
+#include <asm/pgtable-4level-hwdef.h>
#endif
/*
*
* Level 1 descriptor (PUD).
*/
-
+#define PUD_TYPE_TABLE (_AT(pudval_t, 3) << 0)
#define PUD_TABLE_BIT (_AT(pgdval_t, 1) << 1)
#define PUD_TYPE_MASK (_AT(pgdval_t, 3) << 0)
#define PUD_TYPE_SECT (_AT(pgdval_t, 1) << 0)
* VMALLOC and SPARSEMEM_VMEMMAP ranges.
*/
#define VMALLOC_START (UL(0xffffffffffffffff) << VA_BITS)
+#ifndef CONFIG_ARM64_4_LEVELS
#define VMALLOC_END (PAGE_OFFSET - UL(0x400000000) - SZ_64K)
+#else
+#define VMALLOC_END (PAGE_OFFSET - UL(0x40000000000) - SZ_64K)
+#endif
#define vmemmap ((struct page *)(VMALLOC_END + SZ_64K))
#ifndef __ASSEMBLY__
extern void __pte_error(const char *file, int line, unsigned long val);
extern void __pmd_error(const char *file, int line, unsigned long val);
+extern void __pud_error(const char *file, int line, unsigned long val);
extern void __pgd_error(const char *file, int line, unsigned long val);
#define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte))
#ifndef CONFIG_ARM64_2_LEVELS
#define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd))
#endif
+#ifdef CONFIG_ARM64_4_LEVELS
+#define pud_ERROR(pud) __pud_error(__FILE__, __LINE__, pud_val(pud))
+#endif
#define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
#ifdef CONFIG_SMP
#endif /* CONFIG_ARM64_2_LEVELS */
+#ifdef CONFIG_ARM64_4_LEVELS
+
+#define pgd_none(pgd) (!pgd_val(pgd))
+#define pgd_bad(pgd) (!(pgd_val(pgd) & 2))
+#define pgd_present(pgd) (pgd_val(pgd))
+
+static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
+{
+ *pgdp = pgd;
+ dsb(ishst);
+}
+
+static inline void pgd_clear(pgd_t *pgdp)
+{
+ set_pgd(pgdp, __pgd(0));
+}
+
+static inline pud_t *pgd_page_vaddr(pgd_t pgd)
+{
+ return __va(pgd_val(pgd) & PHYS_MASK & (s32)PAGE_MASK);
+}
+
+#endif /* CONFIG_ARM64_4_LEVELS */
+
/* to find an entry in a page-table-directory */
#define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
/* to find an entry in a kernel page-table-directory */
#define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
+#ifdef CONFIG_ARM64_4_LEVELS
+#define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
+static inline pud_t *pud_offset(pgd_t *pgd, unsigned long addr)
+{
+ return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(addr);
+}
+#endif
+
/* Find an entry in the second-level page table.. */
#ifndef CONFIG_ARM64_2_LEVELS
#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
}
#endif
+#ifdef CONFIG_ARM64_4_LEVELS
+static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp,
+ unsigned long addr)
+{
+ tlb_add_flush(tlb, addr);
+ tlb_remove_page(tlb, virt_to_page(pudp));
+}
+#endif
+
static inline void __tlb_remove_pmd_tlb_entry(struct mmu_gather *tlb, pmd_t *pmdp,
unsigned long address)
{
.quad PAGE_OFFSET
/*
- * Macro to populate the PGD for the corresponding block entry in the next
- * level (tbl) for the given virtual address.
+ * Macro to populate the PUD for the corresponding block entry in the next
+ * level (tbl) for the given virtual address in case of 4 levels.
*
- * Preserves: pgd, tbl, virt
- * Corrupts: tmp1, tmp2
+ * Preserves: pgd, virt
+ * Corrupts: tbl, tmp1, tmp2
+ * Returns: pud
*/
- .macro create_pgd_entry, pgd, tbl, virt, tmp1, tmp2
+ .macro create_pud_entry, pgd, tbl, virt, pud, tmp1, tmp2
+#ifdef CONFIG_ARM64_4_LEVELS
+ add \tbl, \tbl, #PAGE_SIZE // bump tbl 1 page up.
+ // to make room for pud
+ add \pud, \pgd, #PAGE_SIZE // pgd points to pud which
+ // follows pgd
+ lsr \tmp1, \virt, #PUD_SHIFT
+ and \tmp1, \tmp1, #PTRS_PER_PUD - 1 // PUD index
+ orr \tmp2, \tbl, #3 // PUD entry table type
+ str \tmp2, [\pud, \tmp1, lsl #3]
+#else
+ mov \pud, \tbl
+#endif
+ .endm
+
+/*
+ * Macro to populate the PGD (and possibily PUD) for the corresponding
+ * block entry in the next level (tbl) for the given virtual address.
+ *
+ * Preserves: pgd, virt
+ * Corrupts: tmp1, tmp2, tmp3
+ * Returns: tbl -> page where block mappings can be placed
+ * (changed to make room for pud with 4 levels, preserved otherwise)
+ */
+ .macro create_pgd_entry, pgd, tbl, virt, tmp1, tmp2, tmp3
+ create_pud_entry \pgd, \tbl, \virt, \tmp3, \tmp1, \tmp2
lsr \tmp1, \virt, #PGDIR_SHIFT
and \tmp1, \tmp1, #PTRS_PER_PGD - 1 // PGD index
- orr \tmp2, \tbl, #3 // PGD entry table type
+ orr \tmp2, \tmp3, #3 // PGD entry table type
str \tmp2, [\pgd, \tmp1, lsl #3]
.endm
add x0, x25, #PAGE_SIZE // section table address
ldr x3, =KERNEL_START
add x3, x3, x28 // __pa(KERNEL_START)
- create_pgd_entry x25, x0, x3, x5, x6
+ create_pgd_entry x25, x0, x3, x1, x5, x6
ldr x6, =KERNEL_END
mov x5, x3 // __pa(KERNEL_START)
add x6, x6, x28 // __pa(KERNEL_END)
*/
add x0, x26, #PAGE_SIZE // section table address
mov x5, #PAGE_OFFSET
- create_pgd_entry x26, x0, x5, x3, x6
+ create_pgd_entry x26, x0, x5, x1, x3, x6
ldr x6, =KERNEL_END
mov x3, x24 // phys offset
create_block_map x0, x7, x3, x5, x6
pr_crit("%s:%d: bad pmd %016lx.\n", file, line, val);
}
+void __pud_error(const char *file, int line, unsigned long val)
+{
+ pr_crit("%s:%d: bad pud %016lx.\n", file, line, val);
+}
+
void __pgd_error(const char *file, int line, unsigned long val)
{
pr_crit("%s:%d: bad pgd %016lx.\n", file, line, val);
break;
pud = pud_offset(pgd, addr);
+ printk(", *pud=%016llx", pud_val(*pud));
if (pud_none(*pud) || pud_bad(*pud))
break;
EXPORT_SYMBOL(ioremap_cache);
static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss;
-#ifndef CONFIG_ARM64_64K_PAGES
+#ifndef CONFIG_ARM64_2_LEVELS
static pte_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss;
#endif
+#ifdef CONFIG_ARM64_4_LEVELS
+static pte_t bm_pud[PTRS_PER_PUD] __page_aligned_bss;
+#endif
static inline pud_t * __init early_ioremap_pud(unsigned long addr)
{
unsigned long addr = fix_to_virt(FIX_BTMAP_BEGIN);
pgd = pgd_offset_k(addr);
+ pgd_populate(&init_mm, pgd, bm_pud);
pud = pud_offset(pgd, addr);
pud_populate(&init_mm, pud, bm_pmd);
pmd = pmd_offset(pud, addr);
#include <asm/setup.h>
#include <asm/sizes.h>
#include <asm/tlb.h>
+#include <asm/memblock.h>
#include <asm/mmu_context.h>
#include "mm.h"
unsigned long end, unsigned long phys,
int map_io)
{
- pud_t *pud = pud_offset(pgd, addr);
+ pud_t *pud;
unsigned long next;
+ if (pgd_none(*pgd)) {
+ pud = early_alloc(PTRS_PER_PUD * sizeof(pud_t));
+ pgd_populate(&init_mm, pgd, pud);
+ }
+ BUG_ON(pgd_bad(*pgd));
+
+ pud = pud_offset(pgd, addr);
do {
next = pud_addr_end(addr, end);
* memory addressable from the initial direct kernel mapping.
*
* The initial direct kernel mapping, located at swapper_pg_dir,
- * gives us PGDIR_SIZE memory starting from PHYS_OFFSET (which must be
+ * gives us PUD_SIZE memory starting from PHYS_OFFSET (which must be
* aligned to 2MB as per Documentation/arm64/booting.txt).
*/
- limit = PHYS_OFFSET + PGDIR_SIZE;
+ limit = PHYS_OFFSET + PUD_SIZE;
memblock_set_current_limit(limit);
/* map all the memory banks */
projects / linux-beck.git / commitdiff