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authorHyok S. Choi <hyok.choi@samsung.com>2006-06-28 09:10:01 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-06-28 12:59:56 -0400
commitd090dddaba7c8da6401bb259340dce05ca32f564 (patch)
treec35d9e22dc09d40144b4a672962269ff60c9ad07 /arch/arm/mm/proc-sa1100.S
parenta4f7e76367f7775ecf534a37b4623c83d9d7ba74 (diff)
[ARM] nommu: Initial uCLinux support for MMU-based CPUs
In noMMU mode, various of functions which are defined in mm/proc-*.S is not valid or needed to be avoided. i.g. switch_mm is not needed, just returns and this makes the I & D caches are valid which shows great improvement of performance including task switching and IPC. Signed-off-by: Hyok S. Choi <hyok.choi@samsung.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/proc-sa1100.S')
-rw-r--r--arch/arm/mm/proc-sa1100.S11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-sa1100.S b/arch/arm/mm/proc-sa1100.S
index 777ad99c1439..0a2107ad4c32 100644
--- a/arch/arm/mm/proc-sa1100.S
+++ b/arch/arm/mm/proc-sa1100.S
@@ -2,6 +2,7 @@
2 * linux/arch/arm/mm/proc-sa1100.S 2 * linux/arch/arm/mm/proc-sa1100.S
3 * 3 *
4 * Copyright (C) 1997-2002 Russell King 4 * Copyright (C) 1997-2002 Russell King
5 * hacked for non-paged-MM by Hyok S. Choi, 2003.
5 * 6 *
6 * This program is free software; you can redistribute it and/or modify 7 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as 8 * it under the terms of the GNU General Public License version 2 as
@@ -77,7 +78,9 @@ ENTRY(cpu_sa1100_reset)
77 mov ip, #0 78 mov ip, #0
78 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches 79 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
79 mcr p15, 0, ip, c7, c10, 4 @ drain WB 80 mcr p15, 0, ip, c7, c10, 4 @ drain WB
81#ifdef CONFIG_MMU
80 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs 82 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
83#endif
81 mrc p15, 0, ip, c1, c0, 0 @ ctrl register 84 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
82 bic ip, ip, #0x000f @ ............wcam 85 bic ip, ip, #0x000f @ ............wcam
83 bic ip, ip, #0x1100 @ ...i...s........ 86 bic ip, ip, #0x1100 @ ...i...s........
@@ -142,12 +145,16 @@ ENTRY(cpu_sa1100_dcache_clean_area)
142 */ 145 */
143 .align 5 146 .align 5
144ENTRY(cpu_sa1100_switch_mm) 147ENTRY(cpu_sa1100_switch_mm)
148#ifdef CONFIG_MMU
145 str lr, [sp, #-4]! 149 str lr, [sp, #-4]!
146 bl v4wb_flush_kern_cache_all @ clears IP 150 bl v4wb_flush_kern_cache_all @ clears IP
147 mcr p15, 0, ip, c9, c0, 0 @ invalidate RB 151 mcr p15, 0, ip, c9, c0, 0 @ invalidate RB
148 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer 152 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
149 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs 153 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
150 ldr pc, [sp], #4 154 ldr pc, [sp], #4
155#else
156 mov pc, lr
157#endif
151 158
152/* 159/*
153 * cpu_sa1100_set_pte(ptep, pte) 160 * cpu_sa1100_set_pte(ptep, pte)
@@ -156,6 +163,7 @@ ENTRY(cpu_sa1100_switch_mm)
156 */ 163 */
157 .align 5 164 .align 5
158ENTRY(cpu_sa1100_set_pte) 165ENTRY(cpu_sa1100_set_pte)
166#ifdef CONFIG_MMU
159 str r1, [r0], #-2048 @ linux version 167 str r1, [r0], #-2048 @ linux version
160 168
161 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY 169 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
@@ -177,6 +185,7 @@ ENTRY(cpu_sa1100_set_pte)
177 mov r0, r0 185 mov r0, r0
178 mcr p15, 0, r0, c7, c10, 1 @ clean D entry 186 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
179 mcr p15, 0, r0, c7, c10, 4 @ drain WB 187 mcr p15, 0, r0, c7, c10, 4 @ drain WB
188#endif
180 mov pc, lr 189 mov pc, lr
181 190
182 __INIT 191 __INIT
@@ -186,7 +195,9 @@ __sa1100_setup:
186 mov r0, #0 195 mov r0, #0
187 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4 196 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
188 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4 197 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
198#ifdef CONFIG_MMU
189 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 199 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
200#endif
190 mrc p15, 0, r0, c1, c0 @ get control register v4 201 mrc p15, 0, r0, c1, c0 @ get control register v4
191 ldr r5, sa1100_cr1_clear 202 ldr r5, sa1100_cr1_clear
192 bic r0, r0, r5 203 bic r0, r0, r5