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466 lines
11 KiB
466 lines
11 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* linux/arch/arm/mm/proc-arm920.S: MMU functions for ARM920 |
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* |
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* Copyright (C) 1999,2000 ARM Limited |
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* Copyright (C) 2000 Deep Blue Solutions Ltd. |
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* hacked for non-paged-MM by Hyok S. Choi, 2003. |
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* |
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* These are the low level assembler for performing cache and TLB |
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* functions on the arm920. |
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* |
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* CONFIG_CPU_ARM920_CPU_IDLE -> nohlt |
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*/ |
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#include <linux/linkage.h> |
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#include <linux/init.h> |
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#include <linux/pgtable.h> |
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#include <asm/assembler.h> |
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#include <asm/hwcap.h> |
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#include <asm/pgtable-hwdef.h> |
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#include <asm/page.h> |
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#include <asm/ptrace.h> |
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#include "proc-macros.S" |
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/* |
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* The size of one data cache line. |
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*/ |
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#define CACHE_DLINESIZE 32 |
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/* |
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* The number of data cache segments. |
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*/ |
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#define CACHE_DSEGMENTS 8 |
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/* |
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* The number of lines in a cache segment. |
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*/ |
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#define CACHE_DENTRIES 64 |
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/* |
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* This is the size at which it becomes more efficient to |
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* clean the whole cache, rather than using the individual |
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* cache line maintenance instructions. |
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*/ |
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#define CACHE_DLIMIT 65536 |
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.text |
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/* |
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* cpu_arm920_proc_init() |
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*/ |
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ENTRY(cpu_arm920_proc_init) |
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ret lr |
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/* |
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* cpu_arm920_proc_fin() |
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*/ |
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ENTRY(cpu_arm920_proc_fin) |
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mrc p15, 0, r0, c1, c0, 0 @ ctrl register |
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bic r0, r0, #0x1000 @ ...i............ |
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bic r0, r0, #0x000e @ ............wca. |
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mcr p15, 0, r0, c1, c0, 0 @ disable caches |
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ret lr |
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/* |
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* cpu_arm920_reset(loc) |
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* |
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* Perform a soft reset of the system. Put the CPU into the |
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* same state as it would be if it had been reset, and branch |
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* to what would be the reset vector. |
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* |
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* loc: location to jump to for soft reset |
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*/ |
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.align 5 |
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.pushsection .idmap.text, "ax" |
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ENTRY(cpu_arm920_reset) |
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mov ip, #0 |
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mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches |
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mcr p15, 0, ip, c7, c10, 4 @ drain WB |
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#ifdef CONFIG_MMU |
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mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs |
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#endif |
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mrc p15, 0, ip, c1, c0, 0 @ ctrl register |
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bic ip, ip, #0x000f @ ............wcam |
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bic ip, ip, #0x1100 @ ...i...s........ |
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mcr p15, 0, ip, c1, c0, 0 @ ctrl register |
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ret r0 |
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ENDPROC(cpu_arm920_reset) |
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.popsection |
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/* |
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* cpu_arm920_do_idle() |
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*/ |
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.align 5 |
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ENTRY(cpu_arm920_do_idle) |
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mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt |
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ret lr |
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#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH |
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/* |
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* flush_icache_all() |
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* |
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* Unconditionally clean and invalidate the entire icache. |
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*/ |
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ENTRY(arm920_flush_icache_all) |
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mov r0, #0 |
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mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache |
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ret lr |
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ENDPROC(arm920_flush_icache_all) |
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/* |
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* flush_user_cache_all() |
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* |
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* Invalidate all cache entries in a particular address |
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* space. |
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*/ |
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ENTRY(arm920_flush_user_cache_all) |
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/* FALLTHROUGH */ |
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/* |
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* flush_kern_cache_all() |
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* |
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* Clean and invalidate the entire cache. |
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*/ |
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ENTRY(arm920_flush_kern_cache_all) |
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mov r2, #VM_EXEC |
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mov ip, #0 |
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__flush_whole_cache: |
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mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments |
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1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries |
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2: mcr p15, 0, r3, c7, c14, 2 @ clean+invalidate D index |
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subs r3, r3, #1 << 26 |
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bcs 2b @ entries 63 to 0 |
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subs r1, r1, #1 << 5 |
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bcs 1b @ segments 7 to 0 |
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tst r2, #VM_EXEC |
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mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache |
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mcrne p15, 0, ip, c7, c10, 4 @ drain WB |
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ret lr |
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/* |
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* flush_user_cache_range(start, end, flags) |
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* |
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* Invalidate a range of cache entries in the specified |
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* address space. |
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* |
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* - start - start address (inclusive) |
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* - end - end address (exclusive) |
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* - flags - vm_flags for address space |
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*/ |
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ENTRY(arm920_flush_user_cache_range) |
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mov ip, #0 |
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sub r3, r1, r0 @ calculate total size |
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cmp r3, #CACHE_DLIMIT |
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bhs __flush_whole_cache |
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1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry |
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tst r2, #VM_EXEC |
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mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry |
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add r0, r0, #CACHE_DLINESIZE |
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cmp r0, r1 |
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blo 1b |
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tst r2, #VM_EXEC |
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mcrne p15, 0, ip, c7, c10, 4 @ drain WB |
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ret lr |
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/* |
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* coherent_kern_range(start, end) |
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* |
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* Ensure coherency between the Icache and the Dcache in the |
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* region described by start, end. If you have non-snooping |
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* Harvard caches, you need to implement this function. |
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* |
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* - start - virtual start address |
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* - end - virtual end address |
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*/ |
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ENTRY(arm920_coherent_kern_range) |
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/* FALLTHROUGH */ |
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/* |
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* coherent_user_range(start, end) |
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* |
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* Ensure coherency between the Icache and the Dcache in the |
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* region described by start, end. If you have non-snooping |
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* Harvard caches, you need to implement this function. |
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* |
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* - start - virtual start address |
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* - end - virtual end address |
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*/ |
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ENTRY(arm920_coherent_user_range) |
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bic r0, r0, #CACHE_DLINESIZE - 1 |
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1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry |
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mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry |
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add r0, r0, #CACHE_DLINESIZE |
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cmp r0, r1 |
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blo 1b |
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mcr p15, 0, r0, c7, c10, 4 @ drain WB |
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mov r0, #0 |
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ret lr |
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/* |
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* flush_kern_dcache_area(void *addr, size_t size) |
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* |
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* Ensure no D cache aliasing occurs, either with itself or |
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* the I cache |
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* |
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* - addr - kernel address |
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* - size - region size |
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*/ |
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ENTRY(arm920_flush_kern_dcache_area) |
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add r1, r0, r1 |
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1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry |
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add r0, r0, #CACHE_DLINESIZE |
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cmp r0, r1 |
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blo 1b |
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mov r0, #0 |
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mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache |
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mcr p15, 0, r0, c7, c10, 4 @ drain WB |
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ret lr |
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/* |
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* dma_inv_range(start, end) |
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* |
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* Invalidate (discard) the specified virtual address range. |
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* May not write back any entries. If 'start' or 'end' |
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* are not cache line aligned, those lines must be written |
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* back. |
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* |
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* - start - virtual start address |
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* - end - virtual end address |
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* |
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* (same as v4wb) |
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*/ |
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arm920_dma_inv_range: |
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tst r0, #CACHE_DLINESIZE - 1 |
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bic r0, r0, #CACHE_DLINESIZE - 1 |
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mcrne p15, 0, r0, c7, c10, 1 @ clean D entry |
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tst r1, #CACHE_DLINESIZE - 1 |
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mcrne p15, 0, r1, c7, c10, 1 @ clean D entry |
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1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry |
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add r0, r0, #CACHE_DLINESIZE |
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cmp r0, r1 |
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blo 1b |
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mcr p15, 0, r0, c7, c10, 4 @ drain WB |
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ret lr |
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/* |
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* dma_clean_range(start, end) |
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* |
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* Clean the specified virtual address range. |
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* |
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* - start - virtual start address |
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* - end - virtual end address |
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* |
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* (same as v4wb) |
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*/ |
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arm920_dma_clean_range: |
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bic r0, r0, #CACHE_DLINESIZE - 1 |
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1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry |
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add r0, r0, #CACHE_DLINESIZE |
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cmp r0, r1 |
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blo 1b |
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mcr p15, 0, r0, c7, c10, 4 @ drain WB |
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ret lr |
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/* |
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* dma_flush_range(start, end) |
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* |
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* Clean and invalidate the specified virtual address range. |
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* |
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* - start - virtual start address |
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* - end - virtual end address |
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*/ |
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ENTRY(arm920_dma_flush_range) |
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bic r0, r0, #CACHE_DLINESIZE - 1 |
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1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry |
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add r0, r0, #CACHE_DLINESIZE |
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cmp r0, r1 |
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blo 1b |
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mcr p15, 0, r0, c7, c10, 4 @ drain WB |
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ret lr |
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/* |
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* dma_map_area(start, size, dir) |
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* - start - kernel virtual start address |
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* - size - size of region |
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* - dir - DMA direction |
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*/ |
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ENTRY(arm920_dma_map_area) |
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add r1, r1, r0 |
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cmp r2, #DMA_TO_DEVICE |
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beq arm920_dma_clean_range |
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bcs arm920_dma_inv_range |
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b arm920_dma_flush_range |
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ENDPROC(arm920_dma_map_area) |
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/* |
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* dma_unmap_area(start, size, dir) |
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* - start - kernel virtual start address |
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* - size - size of region |
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* - dir - DMA direction |
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*/ |
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ENTRY(arm920_dma_unmap_area) |
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ret lr |
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ENDPROC(arm920_dma_unmap_area) |
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.globl arm920_flush_kern_cache_louis |
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.equ arm920_flush_kern_cache_louis, arm920_flush_kern_cache_all |
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@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S) |
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define_cache_functions arm920 |
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#endif |
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ENTRY(cpu_arm920_dcache_clean_area) |
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1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry |
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add r0, r0, #CACHE_DLINESIZE |
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subs r1, r1, #CACHE_DLINESIZE |
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bhi 1b |
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ret lr |
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/* =============================== PageTable ============================== */ |
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/* |
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* cpu_arm920_switch_mm(pgd) |
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* |
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* Set the translation base pointer to be as described by pgd. |
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* |
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* pgd: new page tables |
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*/ |
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.align 5 |
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ENTRY(cpu_arm920_switch_mm) |
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#ifdef CONFIG_MMU |
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mov ip, #0 |
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#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH |
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mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache |
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#else |
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@ && 'Clean & Invalidate whole DCache' |
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@ && Re-written to use Index Ops. |
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@ && Uses registers r1, r3 and ip |
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mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 8 segments |
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1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries |
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2: mcr p15, 0, r3, c7, c14, 2 @ clean & invalidate D index |
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subs r3, r3, #1 << 26 |
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bcs 2b @ entries 63 to 0 |
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subs r1, r1, #1 << 5 |
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bcs 1b @ segments 7 to 0 |
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#endif |
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mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache |
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mcr p15, 0, ip, c7, c10, 4 @ drain WB |
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mcr p15, 0, r0, c2, c0, 0 @ load page table pointer |
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mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs |
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#endif |
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ret lr |
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/* |
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* cpu_arm920_set_pte(ptep, pte, ext) |
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* |
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* Set a PTE and flush it out |
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*/ |
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.align 5 |
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ENTRY(cpu_arm920_set_pte_ext) |
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#ifdef CONFIG_MMU |
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armv3_set_pte_ext |
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mov r0, r0 |
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mcr p15, 0, r0, c7, c10, 1 @ clean D entry |
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mcr p15, 0, r0, c7, c10, 4 @ drain WB |
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#endif |
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ret lr |
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/* Suspend/resume support: taken from arch/arm/plat-s3c24xx/sleep.S */ |
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.globl cpu_arm920_suspend_size |
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.equ cpu_arm920_suspend_size, 4 * 3 |
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#ifdef CONFIG_ARM_CPU_SUSPEND |
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ENTRY(cpu_arm920_do_suspend) |
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stmfd sp!, {r4 - r6, lr} |
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mrc p15, 0, r4, c13, c0, 0 @ PID |
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mrc p15, 0, r5, c3, c0, 0 @ Domain ID |
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mrc p15, 0, r6, c1, c0, 0 @ Control register |
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stmia r0, {r4 - r6} |
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ldmfd sp!, {r4 - r6, pc} |
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ENDPROC(cpu_arm920_do_suspend) |
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ENTRY(cpu_arm920_do_resume) |
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mov ip, #0 |
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mcr p15, 0, ip, c8, c7, 0 @ invalidate I+D TLBs |
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mcr p15, 0, ip, c7, c7, 0 @ invalidate I+D caches |
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ldmia r0, {r4 - r6} |
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mcr p15, 0, r4, c13, c0, 0 @ PID |
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mcr p15, 0, r5, c3, c0, 0 @ Domain ID |
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mcr p15, 0, r1, c2, c0, 0 @ TTB address |
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mov r0, r6 @ control register |
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b cpu_resume_mmu |
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ENDPROC(cpu_arm920_do_resume) |
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#endif |
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.type __arm920_setup, #function |
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__arm920_setup: |
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mov r0, #0 |
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mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4 |
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mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4 |
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#ifdef CONFIG_MMU |
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mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 |
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#endif |
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adr r5, arm920_crval |
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ldmia r5, {r5, r6} |
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mrc p15, 0, r0, c1, c0 @ get control register v4 |
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bic r0, r0, r5 |
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orr r0, r0, r6 |
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ret lr |
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.size __arm920_setup, . - __arm920_setup |
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/* |
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* R |
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* .RVI ZFRS BLDP WCAM |
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* ..11 0001 ..11 0101 |
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* |
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*/ |
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.type arm920_crval, #object |
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arm920_crval: |
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crval clear=0x00003f3f, mmuset=0x00003135, ucset=0x00001130 |
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__INITDATA |
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@ define struct processor (see <asm/proc-fns.h> and proc-macros.S) |
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define_processor_functions arm920, dabort=v4t_early_abort, pabort=legacy_pabort, suspend=1 |
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.section ".rodata" |
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string cpu_arch_name, "armv4t" |
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string cpu_elf_name, "v4" |
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string cpu_arm920_name, "ARM920T" |
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.align |
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.section ".proc.info.init", "a" |
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.type __arm920_proc_info,#object |
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__arm920_proc_info: |
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.long 0x41009200 |
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.long 0xff00fff0 |
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.long PMD_TYPE_SECT | \ |
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PMD_SECT_BUFFERABLE | \ |
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PMD_SECT_CACHEABLE | \ |
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PMD_BIT4 | \ |
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PMD_SECT_AP_WRITE | \ |
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PMD_SECT_AP_READ |
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.long PMD_TYPE_SECT | \ |
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PMD_BIT4 | \ |
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PMD_SECT_AP_WRITE | \ |
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PMD_SECT_AP_READ |
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initfn __arm920_setup, __arm920_proc_info |
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.long cpu_arch_name |
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.long cpu_elf_name |
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.long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB |
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.long cpu_arm920_name |
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.long arm920_processor_functions |
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.long v4wbi_tlb_fns |
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.long v4wb_user_fns |
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#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH |
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.long arm920_cache_fns |
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#else |
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.long v4wt_cache_fns |
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#endif |
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.size __arm920_proc_info, . - __arm920_proc_info
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