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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, #KERNEL_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)
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