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-rw-r--r--arch/arm64/mm/cache.S197
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diff --git a/arch/arm64/mm/cache.S b/arch/arm64/mm/cache.S
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+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Cache maintenance
+ *
+ * Copyright (C) 2001 Deep Blue Solutions Ltd.
+ * Copyright (C) 2012 ARM Ltd.
+ */
+
+#include <linux/errno.h>
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/assembler.h>
+#include <asm/cpufeature.h>
+#include <asm/alternative.h>
+#include <asm/asm-uaccess.h>
+
+/*
+ * caches_clean_inval_pou_macro(start,end) [fixup]
+ *
+ * Ensure that the I and D caches are coherent within specified region.
+ * This is typically used when code has been written to a memory region,
+ * and will be executed.
+ *
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ * - fixup - optional label to branch to on user fault
+ */
+.macro caches_clean_inval_pou_macro, fixup
+alternative_if ARM64_HAS_CACHE_IDC
+ dsb ishst
+ b .Ldc_skip_\@
+alternative_else_nop_endif
+ mov x2, x0
+ mov x3, x1
+ dcache_by_line_op cvau, ish, x2, x3, x4, x5, \fixup
+.Ldc_skip_\@:
+alternative_if ARM64_HAS_CACHE_DIC
+ isb
+ b .Lic_skip_\@
+alternative_else_nop_endif
+ invalidate_icache_by_line x0, x1, x2, x3, \fixup
+.Lic_skip_\@:
+.endm
+
+/*
+ * caches_clean_inval_pou(start,end)
+ *
+ * Ensure that the I and D caches are coherent within specified region.
+ * This is typically used when code has been written to a memory region,
+ * and will be executed.
+ *
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+SYM_FUNC_START(caches_clean_inval_pou)
+ caches_clean_inval_pou_macro
+ ret
+SYM_FUNC_END(caches_clean_inval_pou)
+SYM_FUNC_ALIAS(__pi_caches_clean_inval_pou, caches_clean_inval_pou)
+
+/*
+ * caches_clean_inval_user_pou(start,end)
+ *
+ * Ensure that the I and D caches are coherent within specified region.
+ * This is typically used when code has been written to a memory region,
+ * and will be executed.
+ *
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+SYM_FUNC_START(caches_clean_inval_user_pou)
+ uaccess_ttbr0_enable x2, x3, x4
+
+ caches_clean_inval_pou_macro 2f
+ mov x0, xzr
+1:
+ uaccess_ttbr0_disable x1, x2
+ ret
+2:
+ mov x0, #-EFAULT
+ b 1b
+SYM_FUNC_END(caches_clean_inval_user_pou)
+
+/*
+ * icache_inval_pou(start,end)
+ *
+ * Ensure that the I cache is invalid within specified region.
+ *
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+SYM_FUNC_START(icache_inval_pou)
+alternative_if ARM64_HAS_CACHE_DIC
+ isb
+ ret
+alternative_else_nop_endif
+
+ invalidate_icache_by_line x0, x1, x2, x3
+ ret
+SYM_FUNC_END(icache_inval_pou)
+
+/*
+ * dcache_clean_inval_poc(start, end)
+ *
+ * Ensure that any D-cache lines for the interval [start, end)
+ * are cleaned and invalidated to the PoC.
+ *
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+SYM_FUNC_START(__pi_dcache_clean_inval_poc)
+ dcache_by_line_op civac, sy, x0, x1, x2, x3
+ ret
+SYM_FUNC_END(__pi_dcache_clean_inval_poc)
+SYM_FUNC_ALIAS(dcache_clean_inval_poc, __pi_dcache_clean_inval_poc)
+
+/*
+ * dcache_clean_pou(start, end)
+ *
+ * Ensure that any D-cache lines for the interval [start, end)
+ * are cleaned to the PoU.
+ *
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+SYM_FUNC_START(dcache_clean_pou)
+alternative_if ARM64_HAS_CACHE_IDC
+ dsb ishst
+ ret
+alternative_else_nop_endif
+ dcache_by_line_op cvau, ish, x0, x1, x2, x3
+ ret
+SYM_FUNC_END(dcache_clean_pou)
+
+/*
+ * dcache_inval_poc(start, end)
+ *
+ * Ensure that any D-cache lines for the interval [start, end)
+ * are invalidated. Any partial lines at the ends of the interval are
+ * also cleaned to PoC to prevent data loss.
+ *
+ * - start - kernel start address of region
+ * - end - kernel end address of region
+ */
+SYM_FUNC_START(__pi_dcache_inval_poc)
+ dcache_line_size x2, x3
+ sub x3, x2, #1
+ tst x1, x3 // end cache line aligned?
+ bic x1, x1, x3
+ b.eq 1f
+ dc civac, x1 // clean & invalidate D / U line
+1: tst x0, x3 // start cache line aligned?
+ bic x0, x0, x3
+ b.eq 2f
+ dc civac, x0 // clean & invalidate D / U line
+ b 3f
+2: dc ivac, x0 // invalidate D / U line
+3: add x0, x0, x2
+ cmp x0, x1
+ b.lo 2b
+ dsb sy
+ ret
+SYM_FUNC_END(__pi_dcache_inval_poc)
+SYM_FUNC_ALIAS(dcache_inval_poc, __pi_dcache_inval_poc)
+
+/*
+ * dcache_clean_poc(start, end)
+ *
+ * Ensure that any D-cache lines for the interval [start, end)
+ * are cleaned to the PoC.
+ *
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+SYM_FUNC_START(__pi_dcache_clean_poc)
+ dcache_by_line_op cvac, sy, x0, x1, x2, x3
+ ret
+SYM_FUNC_END(__pi_dcache_clean_poc)
+SYM_FUNC_ALIAS(dcache_clean_poc, __pi_dcache_clean_poc)
+
+/*
+ * dcache_clean_pop(start, end)
+ *
+ * Ensure that any D-cache lines for the interval [start, end)
+ * are cleaned to the PoP.
+ *
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+SYM_FUNC_START(__pi_dcache_clean_pop)
+ alternative_if_not ARM64_HAS_DCPOP
+ b dcache_clean_poc
+ alternative_else_nop_endif
+ dcache_by_line_op cvap, sy, x0, x1, x2, x3
+ ret
+SYM_FUNC_END(__pi_dcache_clean_pop)
+SYM_FUNC_ALIAS(dcache_clean_pop, __pi_dcache_clean_pop)