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| /* SPDX-License-Identifier: GPL-2.0-only */
| /*
| * Copyright (C) 2015 Russell King
| *
| * This assembly is required to safely remap the physical address space
| * for Keystone 2
| */
| #include <linux/linkage.h>
| #include <linux/pgtable.h>
| #include <asm/asm-offsets.h>
| #include <asm/cp15.h>
| #include <asm/memory.h>
|
| .section ".idmap.text", "ax"
|
| #define L1_ORDER 3
| #define L2_ORDER 3
|
| ENTRY(lpae_pgtables_remap_asm)
| stmfd sp!, {r4-r8, lr}
|
| mrc p15, 0, r8, c1, c0, 0 @ read control reg
| bic ip, r8, #CR_M @ disable caches and MMU
| mcr p15, 0, ip, c1, c0, 0
| dsb
| isb
|
| /* Update level 2 entries covering the kernel */
| ldr r6, =(_end - 1)
| add r7, r2, #0x1000
| add r6, r7, r6, lsr #SECTION_SHIFT - L2_ORDER
| add r7, r7, #PAGE_OFFSET >> (SECTION_SHIFT - L2_ORDER)
| 1: ldrd r4, r5, [r7]
| adds r4, r4, r0
| adc r5, r5, r1
| strd r4, r5, [r7], #1 << L2_ORDER
| cmp r7, r6
| bls 1b
|
| /* Update level 2 entries for the boot data */
| add r7, r2, #0x1000
| movw r3, #FDT_FIXED_BASE >> (SECTION_SHIFT - L2_ORDER)
| add r7, r7, r3
| ldrd r4, r5, [r7]
| adds r4, r4, r0
| adc r5, r5, r1
| strd r4, r5, [r7], #1 << L2_ORDER
| ldrd r4, r5, [r7]
| adds r4, r4, r0
| adc r5, r5, r1
| strd r4, r5, [r7]
|
| /* Update level 1 entries */
| mov r6, #4
| mov r7, r2
| 2: ldrd r4, r5, [r7]
| adds r4, r4, r0
| adc r5, r5, r1
| strd r4, r5, [r7], #1 << L1_ORDER
| subs r6, r6, #1
| bne 2b
|
| mrrc p15, 0, r4, r5, c2 @ read TTBR0
| adds r4, r4, r0 @ update physical address
| adc r5, r5, r1
| mcrr p15, 0, r4, r5, c2 @ write back TTBR0
| mrrc p15, 1, r4, r5, c2 @ read TTBR1
| adds r4, r4, r0 @ update physical address
| adc r5, r5, r1
| mcrr p15, 1, r4, r5, c2 @ write back TTBR1
|
| dsb
|
| mov ip, #0
| mcr p15, 0, ip, c7, c5, 0 @ I+BTB cache invalidate
| mcr p15, 0, ip, c8, c7, 0 @ local_flush_tlb_all()
| dsb
| isb
|
| mcr p15, 0, r8, c1, c0, 0 @ re-enable MMU
| dsb
| isb
|
| ldmfd sp!, {r4-r8, pc}
| ENDPROC(lpae_pgtables_remap_asm)
|
|
