1 files changed, 150 insertions, 0 deletions

diff --git a/arch/arm/mm/proc-v7-3level.S b/arch/arm/mm/proc-v7-3level.S
new file mode 100644
index 000000000000..8de0f1dd1549
--- /dev/null
+++ b/arch/arm/mm/proc-v7-3level.S
@@ -0,0 +1,150 @@
+/*
+ * arch/arm/mm/proc-v7-3level.S
+ *
+ * Copyright (C) 2001 Deep Blue Solutions Ltd.
+ * Copyright (C) 2011 ARM Ltd.
+ * Author: Catalin Marinas <catalin.marinas@arm.com>
+ *   based on arch/arm/mm/proc-v7-2level.S
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#define TTB_IRGN_NC     (0 << 8)
+#define TTB_IRGN_WBWA   (1 << 8)
+#define TTB_IRGN_WT     (2 << 8)
+#define TTB_IRGN_WB     (3 << 8)
+#define TTB_RGN_NC      (0 << 10)
+#define TTB_RGN_OC_WBWA (1 << 10)
+#define TTB_RGN_OC_WT   (2 << 10)
+#define TTB_RGN_OC_WB   (3 << 10)
+#define TTB_S           (3 << 12)
+#define TTB_EAE         (1 << 31)
+
+/* PTWs cacheable, inner WB not shareable, outer WB not shareable */
+#define TTB_FLAGS_UP    (TTB_IRGN_WB|TTB_RGN_OC_WB)
+#define PMD_FLAGS_UP    (PMD_SECT_WB)
+
+/* PTWs cacheable, inner WBWA shareable, outer WBWA not shareable */
+#define TTB_FLAGS_SMP   (TTB_IRGN_WBWA|TTB_S|TTB_RGN_OC_WBWA)
+#define PMD_FLAGS_SMP   (PMD_SECT_WBWA|PMD_SECT_S)
+
+/*
+ * cpu_v7_switch_mm(pgd_phys, tsk)
+ *
+ * Set the translation table base pointer to be pgd_phys (physical address of
+ * the new TTB).
+ */
+ENTRY(cpu_v7_switch_mm)
+#ifdef CONFIG_MMU
+        ldr     r1, [r1, #MM_CONTEXT_ID]        @ get mm->context.id
+        and     r3, r1, #0xff
+        mov     r3, r3, lsl #(48 - 32)          @ ASID
+        mcrr    p15, 0, r0, r3, c2              @ set TTB 0
+        isb
+#endif
+        mov     pc, lr
+ENDPROC(cpu_v7_switch_mm)
+
+/*
+ * cpu_v7_set_pte_ext(ptep, pte)
+ *
+ * Set a level 2 translation table entry.
+ * - ptep - pointer to level 3 translation table entry
+ * - pte - PTE value to store (64-bit in r2 and r3)
+ */
+ENTRY(cpu_v7_set_pte_ext)
+#ifdef CONFIG_MMU
+        tst     r2, #L_PTE_PRESENT
+        beq     1f
+        tst     r3, #1 << (55 - 32)             @ L_PTE_DIRTY
+        orreq   r2, #L_PTE_RDONLY
+1:      strd    r2, r3, [r0]
+        mcr     p15, 0, r0, c7, c10, 1          @ flush_pte
+#endif
+        mov     pc, lr
+ENDPROC(cpu_v7_set_pte_ext)
+
+        /*
+         * Memory region attributes for LPAE (defined in pgtable-3level.h):
+         *
+         *   n = AttrIndx[2:0]
+         *
+         *                      n       MAIR
+         *   UNCACHED           000     00000000
+         *   BUFFERABLE         001     01000100
+         *   DEV_WC             001     01000100
+         *   WRITETHROUGH       010     10101010
+         *   WRITEBACK          011     11101110
+         *   DEV_CACHED         011     11101110
+         *   DEV_SHARED         100     00000100
+         *   DEV_NONSHARED      100     00000100
+         *   unused             101
+         *   unused             110
+         *   WRITEALLOC         111     11111111
+         */
+.equ    PRRR,   0xeeaa4400                      @ MAIR0
+.equ    NMRR,   0xff000004                      @ MAIR1
+
+        /*
+         * Macro for setting up the TTBRx and TTBCR registers.
+         * - \ttbr1 updated.
+         */
+        .macro  v7_ttb_setup, zero, ttbr0, ttbr1, tmp
+        ldr     \tmp, =swapper_pg_dir           @ swapper_pg_dir virtual address
+        cmp     \ttbr1, \tmp                    @ PHYS_OFFSET > PAGE_OFFSET? (branch below)
+        mrc     p15, 0, \tmp, c2, c0, 2         @ TTB control register
+        orr     \tmp, \tmp, #TTB_EAE
+        ALT_SMP(orr     \tmp, \tmp, #TTB_FLAGS_SMP)
+        ALT_UP(orr      \tmp, \tmp, #TTB_FLAGS_UP)
+        ALT_SMP(orr     \tmp, \tmp, #TTB_FLAGS_SMP << 16)
+        ALT_UP(orr      \tmp, \tmp, #TTB_FLAGS_UP << 16)
+        /*
+         * TTBR0/TTBR1 split (PAGE_OFFSET):
+         *   0x40000000: T0SZ = 2, T1SZ = 0 (not used)
+         *   0x80000000: T0SZ = 0, T1SZ = 1
+         *   0xc0000000: T0SZ = 0, T1SZ = 2
+         *
+         * Only use this feature if PHYS_OFFSET <= PAGE_OFFSET, otherwise
+         * booting secondary CPUs would end up using TTBR1 for the identity
+         * mapping set up in TTBR0.
+         */
+        bhi     9001f                           @ PHYS_OFFSET > PAGE_OFFSET?
+        orr     \tmp, \tmp, #(((PAGE_OFFSET >> 30) - 1) << 16) @ TTBCR.T1SZ
+#if defined CONFIG_VMSPLIT_2G
+        /* PAGE_OFFSET == 0x80000000, T1SZ == 1 */
+        add     \ttbr1, \ttbr1, #1 << 4         @ skip two L1 entries
+#elif defined CONFIG_VMSPLIT_3G
+        /* PAGE_OFFSET == 0xc0000000, T1SZ == 2 */
+        add     \ttbr1, \ttbr1, #4096 * (1 + 3) @ only L2 used, skip pgd+3*pmd
+#endif
+        /* CONFIG_VMSPLIT_1G does not need TTBR1 adjustment */
+9001:   mcr     p15, 0, \tmp, c2, c0, 2         @ TTB control register
+        mcrr    p15, 1, \ttbr1, \zero, c2       @ load TTBR1
+        .endm
+
+        __CPUINIT
+
+        /*
+         *   AT
+         *  TFR   EV X F   IHD LR    S
+         * .EEE ..EE PUI. .TAT 4RVI ZWRS BLDP WCAM
+         * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
+         *   11    0 110    1  0011 1100 .111 1101 < we want
+         */
+        .align  2
+        .type   v7_crval, #object
+v7_crval:
+        crval   clear=0x0120c302, mmuset=0x30c23c7d, ucset=0x00c01c7c
+
+        .previous