arm/mm/tlb-v4wbi.S

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /*
0003  *  linux/arch/arm/mm/tlbv4wbi.S
0004  *
0005  *  Copyright (C) 1997-2002 Russell King
0006  *
0007  *  ARM architecture version 4 and version 5 TLB handling functions.
0008  *  These assume a split I/D TLBs, with a write buffer.
0009  *
0010  *  Processors: ARM920 ARM922 ARM925 ARM926 XScale
0011  */
0012 #include <linux/linkage.h>
0013 #include <linux/init.h>
0014 #include <asm/assembler.h>
0015 #include <asm/asm-offsets.h>
0016 #include <asm/tlbflush.h>
0017 #include "proc-macros.S"
0018
0019 /*
0020  *  v4wb_flush_user_tlb_range(start, end, mm)
0021  *
0022  *  Invalidate a range of TLB entries in the specified address space.
0023  *
0024  *  - start - range start address
0025  *  - end   - range end address
0026  *  - mm    - mm_struct describing address space
0027  */
0028     .align  5
0029 ENTRY(v4wbi_flush_user_tlb_range)
0030     vma_vm_mm ip, r2
0031     act_mm  r3              @ get current->active_mm
0032     eors    r3, ip, r3          @ == mm ?
0033     retne   lr              @ no, we dont do anything
0034     mov r3, #0
0035     mcr p15, 0, r3, c7, c10, 4      @ drain WB
0036     vma_vm_flags r2, r2
0037     bic r0, r0, #0x0ff
0038     bic r0, r0, #0xf00
0039 1:  tst r2, #VM_EXEC
0040     mcrne   p15, 0, r0, c8, c5, 1       @ invalidate I TLB entry
0041     mcr p15, 0, r0, c8, c6, 1       @ invalidate D TLB entry
0042     add r0, r0, #PAGE_SZ
0043     cmp r0, r1
0044     blo 1b
0045     ret lr
0046
0047 ENTRY(v4wbi_flush_kern_tlb_range)
0048     mov r3, #0
0049     mcr p15, 0, r3, c7, c10, 4      @ drain WB
0050     bic r0, r0, #0x0ff
0051     bic r0, r0, #0xf00
0052 1:  mcr p15, 0, r0, c8, c5, 1       @ invalidate I TLB entry
0053     mcr p15, 0, r0, c8, c6, 1       @ invalidate D TLB entry
0054     add r0, r0, #PAGE_SZ
0055     cmp r0, r1
0056     blo 1b
0057     ret lr
0058
0059     __INITDATA
0060
0061     /* define struct cpu_tlb_fns (see <asm/tlbflush.h> and proc-macros.S) */
0062     define_tlb_functions v4wbi, v4wbi_tlb_flags