proc-arm1020.S
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上传日期:2013-02-24
资源大小:30529k
文件大小:19k
- /*
- * linux/arch/arm/mm/arm1020.S: MMU functions for ARM1020
- *
- * Copyright (C) 2000 ARM Limited
- * Copyright (C) 2000 Deep Blue Solutions Ltd.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- *
- * These are the low level assembler for performing cache and TLB
- * functions on the arm1020.
- */
- #include <linux/linkage.h>
- #include <linux/config.h>
- #include <asm/assembler.h>
- #include <asm/constants.h>
- #include <asm/procinfo.h>
- #include <asm/hardware.h>
- /*
- * This is the maximum size of an area which will be invalidated
- * using the single invalidate entry instructions. Anything larger
- * than this, and we go for the whole cache.
- *
- * This value should be chosen such that we choose the cheapest
- * alternative.
- */
- #define MAX_AREA_SIZE 32768
- /*
- * the cache line size of the I and D cache
- */
- #define DCACHELINESIZE 32
- #define ICACHELINESIZE 32
- /*
- * and the page size
- */
- #define PAGESIZE 4096
- .text
- /*
- * cpu_arm1020_data_abort()
- *
- * obtain information about current aborted instruction
- * Note: we read user space. This means we might cause a data
- * abort here if the I-TLB and D-TLB aren't seeing the same
- * picture. Unfortunately, this does happen. We live with it.
- *
- * r2 = address of aborted instruction
- * r3 = cpsr
- *
- * Returns:
- * r0 = address of abort
- * r1 != 0 if writing
- * r3 = FSR
- * r4 = corrupted
- */
- .align 5
- ENTRY(cpu_arm1020_data_abort)
- mrc p15, 0, r3, c5, c0, 0 @ get FSR
- mrc p15, 0, r0, c6, c0, 0 @ get FAR
- ldr r1, [r2] @ read aborted instruction
- and r3, r3, #255
- tst r1, r1, lsr #21 @ C = bit 20
- sbc r1, r1, r1 @ r1 = C - 1
- mov pc, lr
- /*
- * cpu_arm1020_check_bugs()
- */
- ENTRY(cpu_arm1020_check_bugs)
- mrs ip, cpsr
- bic ip, ip, #F_BIT
- msr cpsr, ip
- mov pc, lr
- /*
- * cpu_arm1020_proc_init()
- */
- ENTRY(cpu_arm1020_proc_init)
- mov pc, lr
- /*
- * cpu_arm1020_proc_fin()
- */
- ENTRY(cpu_arm1020_proc_fin)
- stmfd sp!, {lr}
- mov ip, #F_BIT | I_BIT | SVC_MODE
- msr cpsr_c, ip
- bl cpu_arm1020_cache_clean_invalidate_all
- mrc p15, 0, r0, c1, c0, 0 @ ctrl register
- bic r0, r0, #0x1000 @ ...i............
- bic r0, r0, #0x000e @ ............wca.
- mcr p15, 0, r0, c1, c0, 0 @ disable caches
- ldmfd sp!, {pc}
- /*
- * cpu_arm1020_reset(loc)
- *
- * Perform a soft reset of the system. Put the CPU into the
- * same state as it would be if it had been reset, and branch
- * to what would be the reset vector.
- *
- * loc: location to jump to for soft reset
- */
- .align 5
- ENTRY(cpu_arm1020_reset)
- mov ip, #0
- mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
- mcr p15, 0, ip, c7, c10, 4 @ drain WB
- mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
- mrc p15, 0, ip, c1, c0, 0 @ ctrl register
- bic ip, ip, #0x000f @ ............wcam
- bic ip, ip, #0x1100 @ ...i...s........
- mcr p15, 0, ip, c1, c0, 0 @ ctrl register
- mov pc, r0
- /*
- * cpu_arm1020_do_idle()
- */
- .align 5
- ENTRY(cpu_arm1020_do_idle)
- mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- mov r0, r0
- #endif
- mov pc, lr
- /* ================================= CACHE ================================ */
- /*
- * cpu_arm1020_cache_clean_invalidate_all()
- *
- * clean and invalidate all cache lines
- *
- * Note:
- * 1. we should preserve r0 at all times
- */
- .align 5
- ENTRY(cpu_arm1020_cache_clean_invalidate_all)
- mov r2, #1
- cpu_arm1020_cache_clean_invalidate_all_r2:
- #ifdef CONFIG_CPU_ARM1020_D_CACHE_ON
- mcr p15, 0, ip, c7, c10, 4
- mov r1, #0xf @ 16 segments
- 1: mov r3, #0x3F @ 64 entries
- 2: mov ip, r3, LSL #26 @ shift up entry
- orr ip, ip, r1, LSL #5 @ shift in/up index
- mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry
- mcr p15, 0, ip, c7, c10, 4 @ drain WB
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov ip, ip
- #endif
- subs r3, r3, #1
- cmp r3, #0
- bge 2b @ entries 3F to 0
- subs r1, r1, #1
- cmp r1, #0
- bge 1b @ segments 7 to 0
- #endif
-
- #ifdef CONFIG_CPU_ARM1020_I_CACHE_ON
- teq r2, #0
- mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
- #endif
- mcr p15, 0, ip, c7, c10, 4 @ drain WB
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov ip, ip
- mov ip, ip
- #endif
- mov pc, lr
- /*
- * cpu_arm1020_cache_clean_invalidate_range(start, end, flags)
- *
- * clean and invalidate all cache lines associated with this area of memory
- *
- * start: Area start address
- * end: Area end address
- * flags: nonzero for I cache as well
- */
- .align 5
- ENTRY(cpu_arm1020_cache_clean_invalidate_range)
- bic r0, r0, #DCACHELINESIZE - 1
- sub r3, r1, r0
- cmp r3, #MAX_AREA_SIZE
- bgt cpu_arm1020_cache_clean_invalidate_all_r2
- mcr p15, 0, r3, c7, c10, 4
- #ifdef CONFIG_CPU_ARM1020_D_CACHE_ON
- 1: mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
- mcr p15, 0, r3, c7, c10, 4 @ drain WB
- add r0, r0, #DCACHELINESIZE
- mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
- mcr p15, 0, r3, c7, c10, 4 @ drain WB
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- #endif
- add r0, r0, #DCACHELINESIZE
- cmp r0, r1
- blt 1b
- #endif
- #ifdef CONFIG_CPU_ARM1020_I_CACHE_ON
- teq r2, #0
- movne r0, #0
- mcrne p15, 0, r0, c7, c5, 0 @ invalidate I cache
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- mov r0, r0
- #endif
- #endif
- mov pc, lr
- /*
- * cpu_arm1020_flush_ram_page(page)
- *
- * clean and invalidate all cache lines associated with this area of memory
- *
- * page: page to clean and invalidate
- */
- .align 5
- ENTRY(cpu_arm1020_flush_ram_page)
- mcr p15, 0, r1, c7, c10, 4
- #ifdef CONFIG_CPU_ARM1020_D_CACHE_ON
- mov r1, #PAGESIZE
- 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
- mcr p15, 0, r0, c7, c10, 4 @ drain WB
- add r0, r0, #DCACHELINESIZE
- mcr p15, 0, r0, c7, c10, 1 @ clean D entry
- mcr p15, 0, r0, c7, c10, 4 @ drain WB
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- mov r0, r0
- #endif
- subs r1, r1, #2 * DCACHELINESIZE
- bne 1b
- mov r0, #0
- #endif
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- mov r0, r0
- #endif
- mov pc, lr
- /* ================================ D-CACHE =============================== */
- /*
- * cpu_arm1020_dcache_invalidate_range(start, end)
- *
- * throw away all D-cached data in specified region without an obligation
- * to write them back. Note however that we must clean the D-cached entries
- * around the boundaries if the start and/or end address are not cache
- * aligned.
- *
- * start: virtual start address
- * end: virtual end address
- */
- .align 5
- ENTRY(cpu_arm1020_dcache_invalidate_range)
- #ifdef CONFIG_CPU_ARM1020_D_CACHE_ON
- /* D cache are on */
- tst r0, #DCACHELINESIZE - 1
- bic r0, r0, #DCACHELINESIZE - 1
- mcrne p15, 0, r0, c7, c10, 4
- mcrne p15, 0, r0, c7, c10, 1 @ clean D entry at start
- mcrne p15, 0, r0, c7, c10, 4 @ drain WB
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- mov r0, r0
- #endif
- tst r1, #DCACHELINESIZE - 1
- mcrne p15, 0, r1, c7, c10, 4
- mcrne p15, 0, r1, c7, c10, 1 @ clean D entry at end
- mcrne p15, 0, r1, c7, c10, 4 @ drain WB
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r1, r1
- mov r1, r1
- mov r1, r1
- #endif
-
- 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- #endif
- add r0, r0, #DCACHELINESIZE
- cmp r0, r1
- blt 1b
- #else
- /* D cache off, but still drain the write buffer */
- mcr p15, 0, r0, c7, c10, 4 @ Drain write buffer
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- mov r0, r0
- #endif
- #endif
- mov pc, lr
- /*
- * cpu_arm1020_dcache_clean_range(start, end)
- *
- * For the specified virtual address range, ensure that all caches contain
- * clean data, such that peripheral accesses to the physical RAM fetch
- * correct data.
- *
- * start: virtual start address
- * end: virtual end address
- */
- .align 5
- ENTRY(cpu_arm1020_dcache_clean_range)
- bic r0, r0, #DCACHELINESIZE - 1
- sub r3, r1, r0
- cmp r3, #MAX_AREA_SIZE
- bgt cpu_arm1020_cache_clean_invalidate_all_r2
- mcr p15, 0, r3, c7, c10, 4
- #ifdef CONFIG_CPU_ARM1020_D_CACHE_ON
- 1: mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
- mcr p15, 0, r3, c7, c10, 4 @ drain WB
- add r0, r0, #DCACHELINESIZE
- mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
- mcr p15, 0, r3, c7, c10, 4 @ drain WB
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- #endif
- add r0, r0, #DCACHELINESIZE
- cmp r0, r1
- blt 1b
- #endif
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- mov r0, r0
- #endif
- mov pc, lr
- /*
- * cpu_arm1020_dcache_clean_page(page)
- *
- * Cleans a single page of dcache so that if we have any future aliased
- * mappings, they will be consistent at the time that they are created.
- *
- * page: virtual address of page to clean from dcache
- *
- * Note:
- * 1. we don't need to flush the write buffer in this case.
- * 2. we don't invalidate the entries since when we write the page
- * out to disk, the entries may get reloaded into the cache.
- */
- .align 5
- ENTRY(cpu_arm1020_dcache_clean_page)
- mov r1, #PAGESIZE
- mcr p15, 0, r0, c7, c10, 4
- #ifdef CONFIG_CPU_ARM1020_D_CACHE_ON
- 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry (drain is done by TLB fns)
- mcr p15, 0, r0, c7, c10, 4 @ drain WB
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- #endif
- add r0, r0, #DCACHELINESIZE
- mcr p15, 0, r0, c7, c10, 1 @ clean D entry
- mcr p15, 0, r0, c7, c10, 4 @ drain WB
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- #endif
- add r0, r0, #DCACHELINESIZE
- subs r1, r1, #2 * DCACHELINESIZE
- bhi 1b
- #endif
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- mov r0, r0
- #endif
- mov pc, lr
- /*
- * cpu_arm1020_dcache_clean_entry(addr)
- *
- * Clean the specified entry of any caches such that the MMU
- * translation fetches will obtain correct data.
- *
- * addr: cache-unaligned virtual address
- */
- .align 5
- ENTRY(cpu_arm1020_dcache_clean_entry)
- mov r1, #0
- mcr p15, 0, r1, c7, c10, 4
- #ifdef CONFIG_CPU_ARM1020_D_CACHE_ON
- mcr p15, 0, r0, c7, c10, 1 @ clean single D entry
- mcr p15, 0, r1, c7, c10, 4 @ drain WB
- #endif
- #ifdef CONFIG_CPU_ARM1020_I_CACHE_ON
- mcr p15, 0, r1, c7, c5, 1 @ invalidate I entry
- #endif
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r1, r1
- mov r1, r1
- #endif
- mov pc, lr
- /* ================================ I-CACHE =============================== */
- /*
- * cpu_arm1020_icache_invalidate_range(start, end)
- *
- * invalidate a range of virtual addresses from the Icache
- *
- * start: virtual start address
- * end: virtual end address
- */
- .align 5
- ENTRY(cpu_arm1020_icache_invalidate_range)
- 1: mcr p15, 0, r0, c7, c10, 4
- #ifdef CONFIG_CPU_ARM1020_D_CACHE_ON
- mcr p15, 0, r0, c7, c10, 1 @ Clean D entry
- mcr p15, 0, r0, c7, c10, 4 @ drain WB
- add r0, r0, #DCACHELINESIZE
- mcr p15, 0, r0, c7, c10, 1 @ Clean D entry
- mcr p15, 0, r0, c7, c10, 4 @ drain WB
- #endif
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- #endif
- add r0, r0, #DCACHELINESIZE
- cmp r0, r1
- blo 1b
- ENTRY(cpu_arm1020_icache_invalidate_page)
- mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- mov r0, r0
- #endif
- mov pc, lr
- /* ================================== TLB ================================= */
- /*
- * cpu_arm1020_tlb_invalidate_all()
- *
- * Invalidate all TLB entries
- */
- .align 5
- ENTRY(cpu_arm1020_tlb_invalidate_all)
- mov r0, #0
- mcr p15, 0, r0, c7, c10, 4 @ drain WB
- mcr p15, 0, r0, c8, c7, 0 @ invalidate I & D tlbs
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- mov r0, r0
- #endif
- mov pc, lr
- /*
- * cpu_arm1020_tlb_invalidate_range(start, end)
- *
- * invalidate TLB entries covering the specified range
- *
- * start: range start address
- * end: range end address
- */
- .align 5
- ENTRY(cpu_arm1020_tlb_invalidate_range)
- sub r3, r1, r0
- cmp r3, #256 * PAGESIZE
- bhi cpu_arm1020_tlb_invalidate_all
- mov r3, #0
- mcr p15, 0, r3, c7, c10, 4 @ drain WB
- 1: mcr p15, 0, r0, c8, c6, 1 @ invalidate D TLB entry
- mcr p15, 0, r0, c8, c5, 1 @ invalidate I TLB entry
- add r0, r0, #PAGESIZE
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- #endif
- cmp r0, r1
- blt 1b
- mov pc, lr
- /*
- * cpu_arm1020_tlb_invalidate_page(page, flags)
- *
- * invalidate the TLB entries for the specified page.
- *
- * page: page to invalidate
- * flags: non-zero if we include the I TLB
- */
- .align 5
- ENTRY(cpu_arm1020_tlb_invalidate_page)
- mov r3, #0
- mcr p15, 0, r3, c7, c10, 4 @ drain WB
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- mov r0, r0
- #endif
- teq r1, #0
- mcr p15, 0, r0, c8, c6, 1 @ invalidate D TLB entry
- mcrne p15, 0, r0, c8, c5, 1 @ invalidate I TLB entry
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- mov r0, r0
- #endif
- mov pc, lr
- /* =============================== PageTable ============================== */
- /*
- * cpu_arm1020_set_pgd(pgd)
- *
- * Set the translation base pointer to be as described by pgd.
- *
- * pgd: new page tables
- */
- .align 5
- ENTRY(cpu_arm1020_set_pgd)
- #ifdef CONFIG_CPU_ARM1020_D_CACHE_ON
- mcr p15, 0, r3, c7, c10, 4
- mov r1, #0xF @ 16 segments
- 1: mov r3, #0x3F @ 64 entries
- 2: mov ip, r3, LSL #26 @ shift up entry
- orr ip, ip, r1, LSL #5 @ shift in/up index
- mcr p15, 0, ip, c7, c14, 2 @ Clean & Inval DCache entry
- mov ip, #0
- mcr p15, 0, ip, c7, c10, 4
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov ip, ip
- #endif
- subs r3, r3, #1
- cmp r3, #0
- bge 2b @ entries 3F to 0
- subs r1, r1, #1
- cmp r1, #0
- bge 1b @ segments 15 to 0
- #endif
- mov r1, #0
- #ifdef CONFIG_CPU_ARM1020_I_CACHE_ON
- mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
- #endif
- mcr p15, 0, r1, c7, c10, 4 @ drain WB
- mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
- mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov ip, ip
- mov ip, ip
- #endif
- mov pc, lr
-
- /*
- * cpu_arm1020_set_pmd(pmdp, pmd)
- *
- * Set a level 1 translation table entry, and clean it out of
- * any caches such that the MMUs can load it correctly.
- *
- * pmdp: pointer to PMD entry
- * pmd: PMD value to store
- */
- .align 5
- ENTRY(cpu_arm1020_set_pmd)
- #ifdef CONFIG_CPU_ARM1020_FORCE_WRITE_THROUGH
- eor r2, r1, #0x0a @ C & Section
- tst r2, #0x0b
- biceq r1, r1, #4 @ clear bufferable bit
- #endif
- str r1, [r0]
- #ifdef CONFIG_CPU_ARM1020_D_CACHE_ON
- mcr p15, 0, r0, c7, c10, 4
- mcr p15, 0, r0, c7, c10, 1 @ clean D entry (drain is done by TLB fns)
- #endif
- mcr p15, 0, r0, c7, c10, 4 @ drain WB
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- mov r0, r0
- #endif
- mov pc, lr
- /*
- * cpu_arm1020_set_pte(ptep, pte)
- *
- * Set a PTE and flush it out
- */
- .align 5
- ENTRY(cpu_arm1020_set_pte)
- str r1, [r0], #-1024 @ linux version
- eor r1, r1, #LPTE_PRESENT | LPTE_YOUNG | LPTE_WRITE | LPTE_DIRTY
- bic r2, r1, #0xff0
- bic r2, r2, #3
- orr r2, r2, #HPTE_TYPE_SMALL
- tst r1, #LPTE_USER | LPTE_EXEC @ User or Exec?
- orrne r2, r2, #HPTE_AP_READ
- tst r1, #LPTE_WRITE | LPTE_DIRTY @ Write and Dirty?
- orreq r2, r2, #HPTE_AP_WRITE
- tst r1, #LPTE_PRESENT | LPTE_YOUNG @ Present and Young?
- movne r2, #0
- #ifdef CONFIG_CPU_ARM1020_FORCE_WRITE_THROUGH
- eor r3, r1, #0x0a @ C & small page?
- tst r3, #0x0b
- biceq r2, r2, #4
- #endif
- str r2, [r0] @ hardware version
- mov r0, r0
- #ifdef CONFIG_CPU_ARM1020_D_CACHE_ON
- mcr p15, 0, r0, c7, c10, 4
- mcr p15, 0, r0, c7, c10, 1 @ clean D entry
- #endif
- mcr p15, 0, r0, c7, c10, 4 @ drain WB
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- mov r0, r0
- mov r0, r0
- #endif
- mov pc, lr
- cpu_manu_name:
- .asciz "ARM/VLSI"
- ENTRY(cpu_arm1020_name)
- .ascii "Arm1020"
- #if defined(CONFIG_CPU_ARM1020_CPU_IDLE)
- .ascii "s"
- #endif
- #if defined(CONFIG_CPU_ARM1020_I_CACHE_ON)
- .ascii "i"
- #endif
- #if defined(CONFIG_CPU_ARM1020_D_CACHE_ON)
- .ascii "d"
- #if defined(CONFIG_CPU_ARM1020_FORCE_WRITE_THROUGH)
- .ascii "(wt)"
- #else
- .ascii "(wb)"
- #endif
- #endif
- #ifdef CONFIG_CPU_ARM1020_BRANCH_PREDICTION
- .ascii "B"
- #endif
- #ifdef CONFIG_CPU_ARM1020_ROUND_ROBIN
- .ascii "RR"
- #endif
- .ascii "