[ARM] nommu: MPU support in boot/compressed/head.S
Hyok S. Choi [Mon, 27 Mar 2006 09:21:34 +0000 (10:21 +0100)]
This patch adds MPU support in boot/compressed/head.S.

Signed-off-by: Hyok S. Choi <hyok.choi@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/boot/compressed/head.S

index 491c7e4..b56f5e6 100644 (file)
@@ -2,6 +2,7 @@
  *  linux/arch/arm/boot/compressed/head.S
  *
  *  Copyright (C) 1996-2002 Russell King
+ *  Copyright (C) 2004 Hyok S. Choi (MPU support)
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -320,6 +321,62 @@ params:            ldr     r0, =params_phys
 cache_on:      mov     r3, #8                  @ cache_on function
                b       call_cache_fn
 
+/*
+ * Initialize the highest priority protection region, PR7
+ * to cover all 32bit address and cacheable and bufferable.
+ */
+__armv4_mpu_cache_on:
+               mov     r0, #0x3f               @ 4G, the whole
+               mcr     p15, 0, r0, c6, c7, 0   @ PR7 Area Setting
+               mcr     p15, 0, r0, c6, c7, 1
+
+               mov     r0, #0x80               @ PR7
+               mcr     p15, 0, r0, c2, c0, 0   @ D-cache on
+               mcr     p15, 0, r0, c2, c0, 1   @ I-cache on
+               mcr     p15, 0, r0, c3, c0, 0   @ write-buffer on
+
+               mov     r0, #0xc000
+               mcr     p15, 0, r0, c5, c0, 1   @ I-access permission
+               mcr     p15, 0, r0, c5, c0, 0   @ D-access permission
+
+               mov     r0, #0
+               mcr     p15, 0, r0, c7, c10, 4  @ drain write buffer
+               mcr     p15, 0, r0, c7, c5, 0   @ flush(inval) I-Cache
+               mcr     p15, 0, r0, c7, c6, 0   @ flush(inval) D-Cache
+               mrc     p15, 0, r0, c1, c0, 0   @ read control reg
+                                               @ ...I .... ..D. WC.M
+               orr     r0, r0, #0x002d         @ .... .... ..1. 11.1
+               orr     r0, r0, #0x1000         @ ...1 .... .... ....
+
+               mcr     p15, 0, r0, c1, c0, 0   @ write control reg
+
+               mov     r0, #0
+               mcr     p15, 0, r0, c7, c5, 0   @ flush(inval) I-Cache
+               mcr     p15, 0, r0, c7, c6, 0   @ flush(inval) D-Cache
+               mov     pc, lr
+
+__armv3_mpu_cache_on:
+               mov     r0, #0x3f               @ 4G, the whole
+               mcr     p15, 0, r0, c6, c7, 0   @ PR7 Area Setting
+
+               mov     r0, #0x80               @ PR7
+               mcr     p15, 0, r0, c2, c0, 0   @ cache on
+               mcr     p15, 0, r0, c3, c0, 0   @ write-buffer on
+
+               mov     r0, #0xc000
+               mcr     p15, 0, r0, c5, c0, 0   @ access permission
+
+               mov     r0, #0
+               mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
+               mrc     p15, 0, r0, c1, c0, 0   @ read control reg
+                                               @ .... .... .... WC.M
+               orr     r0, r0, #0x000d         @ .... .... .... 11.1
+               mov     r0, #0
+               mcr     p15, 0, r0, c1, c0, 0   @ write control reg
+
+               mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
+               mov     pc, lr
+
 __setup_mmu:   sub     r3, r4, #16384          @ Page directory size
                bic     r3, r3, #0xff           @ Align the pointer
                bic     r3, r3, #0x3f00
@@ -496,6 +553,18 @@ proc_types:
                b       __armv4_mmu_cache_off
                mov     pc, lr
 
+               .word   0x41007400              @ ARM74x
+               .word   0xff00ff00
+               b       __armv3_mpu_cache_on
+               b       __armv3_mpu_cache_off
+               b       __armv3_mpu_cache_flush
+               
+               .word   0x41009400              @ ARM94x
+               .word   0xff00ff00
+               b       __armv4_mpu_cache_on
+               b       __armv4_mpu_cache_off
+               b       __armv4_mpu_cache_flush
+
                .word   0x00007000              @ ARM7 IDs
                .word   0x0000f000
                mov     pc, lr
@@ -562,6 +631,24 @@ proc_types:
 cache_off:     mov     r3, #12                 @ cache_off function
                b       call_cache_fn
 
+__armv4_mpu_cache_off:
+               mrc     p15, 0, r0, c1, c0
+               bic     r0, r0, #0x000d
+               mcr     p15, 0, r0, c1, c0      @ turn MPU and cache off
+               mov     r0, #0
+               mcr     p15, 0, r0, c7, c10, 4  @ drain write buffer
+               mcr     p15, 0, r0, c7, c6, 0   @ flush D-Cache
+               mcr     p15, 0, r0, c7, c5, 0   @ flush I-Cache
+               mov     pc, lr
+
+__armv3_mpu_cache_off:
+               mrc     p15, 0, r0, c1, c0
+               bic     r0, r0, #0x000d
+               mcr     p15, 0, r0, c1, c0, 0   @ turn MPU and cache off
+               mov     r0, #0
+               mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
+               mov     pc, lr
+
 __armv4_mmu_cache_off:
                mrc     p15, 0, r0, c1, c0
                bic     r0, r0, #0x000d
@@ -601,6 +688,24 @@ cache_clean_flush:
                mov     r3, #16
                b       call_cache_fn
 
+__armv4_mpu_cache_flush:
+               mov     r2, #1
+               mov     r3, #0
+               mcr     p15, 0, ip, c7, c6, 0   @ invalidate D cache
+               mov     r1, #7 << 5             @ 8 segments
+1:             orr     r3, r1, #63 << 26       @ 64 entries
+2:             mcr     p15, 0, r3, c7, c14, 2  @ clean & invalidate D index
+               subs    r3, r3, #1 << 26
+               bcs     2b                      @ entries 63 to 0
+               subs    r1, r1, #1 << 5
+               bcs     1b                      @ segments 7 to 0
+
+               teq     r2, #0
+               mcrne   p15, 0, ip, c7, c5, 0   @ invalidate I cache
+               mcr     p15, 0, ip, c7, c10, 4  @ drain WB
+               mov     pc, lr
+               
+
 __armv6_mmu_cache_flush:
                mov     r1, #0
                mcr     p15, 0, r1, c7, c14, 0  @ clean+invalidate D
@@ -638,6 +743,7 @@ no_cache_id:
                mov     pc, lr
 
 __armv3_mmu_cache_flush:
+__armv3_mpu_cache_flush:
                mov     r1, #0
                mcr     p15, 0, r0, c7, c0, 0   @ invalidate whole cache v3
                mov     pc, lr