diff options
Diffstat (limited to 'arch/arm/mm/tlb-v4wb.S')
| -rw-r--r-- | arch/arm/mm/tlb-v4wb.S | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/arch/arm/mm/tlb-v4wb.S b/arch/arm/mm/tlb-v4wb.S new file mode 100644 index 0000000000..9348bba758 --- /dev/null +++ b/arch/arm/mm/tlb-v4wb.S @@ -0,0 +1,71 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * linux/arch/arm/mm/tlbv4wb.S + * + * Copyright (C) 1997-2002 Russell King + * + * ARM architecture version 4 TLB handling functions. + * These assume a split I/D TLBs w/o I TLB entry, with a write buffer. + * + * Processors: SA110 SA1100 SA1110 + */ +#include <linux/linkage.h> +#include <linux/init.h> +#include <asm/assembler.h> +#include <asm/asm-offsets.h> +#include <asm/tlbflush.h> +#include "proc-macros.S" + + .align 5 +/* + * v4wb_flush_user_tlb_range(start, end, mm) + * + * Invalidate a range of TLB entries in the specified address space. + * + * - start - range start address + * - end - range end address + * - mm - mm_struct describing address space + */ + .align 5 +ENTRY(v4wb_flush_user_tlb_range) + vma_vm_mm ip, r2 + act_mm r3 @ get current->active_mm + eors r3, ip, r3 @ == mm ? + retne lr @ no, we dont do anything + vma_vm_flags r2, r2 + mcr p15, 0, r3, c7, c10, 4 @ drain WB + tst r2, #VM_EXEC + mcrne p15, 0, r3, c8, c5, 0 @ invalidate I TLB + bic r0, r0, #0x0ff + bic r0, r0, #0xf00 +1: mcr p15, 0, r0, c8, c6, 1 @ invalidate D TLB entry + add r0, r0, #PAGE_SZ + cmp r0, r1 + blo 1b + ret lr + +/* + * v4_flush_kern_tlb_range(start, end) + * + * Invalidate a range of TLB entries in the specified kernel + * address range. + * + * - start - virtual address (may not be aligned) + * - end - virtual address (may not be aligned) + */ +ENTRY(v4wb_flush_kern_tlb_range) + mov r3, #0 + mcr p15, 0, r3, c7, c10, 4 @ drain WB + bic r0, r0, #0x0ff + bic r0, r0, #0xf00 + mcr p15, 0, r3, c8, c5, 0 @ invalidate I TLB +1: mcr p15, 0, r0, c8, c6, 1 @ invalidate D TLB entry + add r0, r0, #PAGE_SZ + cmp r0, r1 + blo 1b + ret lr + + __INITDATA + + /* define struct cpu_tlb_fns (see <asm/tlbflush.h> and proc-macros.S) */ + define_tlb_functions v4wb, v4wb_tlb_flags |