diff options
| -rw-r--r-- | arch/arm/boot/compressed/head.S | 93 |
1 files changed, 92 insertions, 1 deletions
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index 680ea6ed77b..d7fb5ee1637 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -436,6 +436,28 @@ __armv4_mmu_cache_on: mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs mov pc, r12 +__armv7_mmu_cache_on: + mov r12, lr + mrc p15, 0, r11, c0, c1, 4 @ read ID_MMFR0 + tst r11, #0xf @ VMSA + blne __setup_mmu + mov r0, #0 + mcr p15, 0, r0, c7, c10, 4 @ drain write buffer + tst r11, #0xf @ VMSA + mcrne p15, 0, r0, c8, c7, 0 @ flush I,D TLBs + mrc p15, 0, r0, c1, c0, 0 @ read control reg + orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement + orr r0, r0, #0x003c @ write buffer + orrne r0, r0, #1 @ MMU enabled + movne r1, #-1 + mcrne p15, 0, r3, c2, c0, 0 @ load page table pointer + mcrne p15, 0, r1, c3, c0, 0 @ load domain access control + mcr p15, 0, r0, c1, c0, 0 @ load control register + mrc p15, 0, r0, c1, c0, 0 @ and read it back + mov r0, #0 + mcr p15, 0, r0, c7, c5, 4 @ ISB + mov pc, r12 + __arm6_mmu_cache_on: mov r12, lr bl __setup_mmu @@ -622,11 +644,17 @@ proc_types: b __armv4_mmu_cache_flush .word 0x0007b000 @ ARMv6 - .word 0x0007f000 + .word 0x000ff000 b __armv4_mmu_cache_on b __armv4_mmu_cache_off b __armv6_mmu_cache_flush + .word 0x000f0000 @ new CPU Id + .word 0x000f0000 + b __armv7_mmu_cache_on + b __armv7_mmu_cache_off + b __armv7_mmu_cache_flush + .word 0 @ unrecognised type .word 0 mov pc, lr @@ -674,6 +702,16 @@ __armv4_mmu_cache_off: mcr p15, 0, r0, c8, c7 @ invalidate whole TLB v4 mov pc, lr +__armv7_mmu_cache_off: + mrc p15, 0, r0, c1, c0 + bic r0, r0, #0x000d + mcr p15, 0, r0, c1, c0 @ turn MMU and cache off + mov r12, lr + bl __armv7_mmu_cache_flush + mov r0, #0 + mcr p15, 0, r0, c8, c7, 0 @ invalidate whole TLB + mov pc, r12 + __arm6_mmu_cache_off: mov r0, #0x00000030 @ ARM6 control reg. b __armv3_mmu_cache_off @@ -730,6 +768,59 @@ __armv6_mmu_cache_flush: mcr p15, 0, r1, c7, c10, 4 @ drain WB mov pc, lr +__armv7_mmu_cache_flush: + mrc p15, 0, r10, c0, c1, 5 @ read ID_MMFR1 + tst r10, #0xf << 16 @ hierarchical cache (ARMv7) + beq hierarchical + mov r10, #0 + mcr p15, 0, r10, c7, c14, 0 @ clean+invalidate D + b iflush +hierarchical: + stmfd sp!, {r0-r5, r7, r9-r11} + mrc p15, 1, r0, c0, c0, 1 @ read clidr + ands r3, r0, #0x7000000 @ extract loc from clidr + mov r3, r3, lsr #23 @ left align loc bit field + beq finished @ if loc is 0, then no need to clean + mov r10, #0 @ start clean at cache level 0 +loop1: + add r2, r10, r10, lsr #1 @ work out 3x current cache level + mov r1, r0, lsr r2 @ extract cache type bits from clidr + and r1, r1, #7 @ mask of the bits for current cache only + cmp r1, #2 @ see what cache we have at this level + blt skip @ skip if no cache, or just i-cache + mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr + mcr p15, 0, r10, c7, c5, 4 @ isb to sych the new cssr&csidr + mrc p15, 1, r1, c0, c0, 0 @ read the new csidr + and r2, r1, #7 @ extract the length of the cache lines + add r2, r2, #4 @ add 4 (line length offset) + ldr r4, =0x3ff + ands r4, r4, r1, lsr #3 @ find maximum number on the way size + .word 0xe16f5f14 @ clz r5, r4 - find bit position of way size increment + ldr r7, =0x7fff + ands r7, r7, r1, lsr #13 @ extract max number of the index size +loop2: + mov r9, r4 @ create working copy of max way size +loop3: + orr r11, r10, r9, lsl r5 @ factor way and cache number into r11 + orr r11, r11, r7, lsl r2 @ factor index number into r11 + mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way + subs r9, r9, #1 @ decrement the way + bge loop3 + subs r7, r7, #1 @ decrement the index + bge loop2 +skip: + add r10, r10, #2 @ increment cache number + cmp r3, r10 + bgt loop1 +finished: + mov r10, #0 @ swith back to cache level 0 + mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr + ldmfd sp!, {r0-r5, r7, r9-r11} +iflush: + mcr p15, 0, r10, c7, c5, 0 @ invalidate I+BTB + mcr p15, 0, r10, c7, c10, 4 @ drain WB + mov pc, lr + __armv4_mmu_cache_flush: mov r2, #64*1024 @ default: 32K dcache size (*2) mov r11, #32 @ default: 32 byte line size |