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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-arm920.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-arm920.S')
-rw-r--r--arch/arm/mm/proc-arm920.S9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-arm920.S b/arch/arm/mm/proc-arm920.S
index a17f79e0199c..31dc839ba07c 100644
--- a/arch/arm/mm/proc-arm920.S
+++ b/arch/arm/mm/proc-arm920.S
@@ -3,6 +3,7 @@
3 * 3 *
4 * Copyright (C) 1999,2000 ARM Limited 4 * Copyright (C) 1999,2000 ARM Limited
5 * Copyright (C) 2000 Deep Blue Solutions Ltd. 5 * Copyright (C) 2000 Deep Blue Solutions Ltd.
6 * hacked for non-paged-MM by Hyok S. Choi, 2003.
6 * 7 *
7 * This program is free software; you can redistribute it and/or modify 8 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by 9 * it under the terms of the GNU General Public License as published by
@@ -97,7 +98,9 @@ ENTRY(cpu_arm920_reset)
97 mov ip, #0 98 mov ip, #0
98 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches 99 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
99 mcr p15, 0, ip, c7, c10, 4 @ drain WB 100 mcr p15, 0, ip, c7, c10, 4 @ drain WB
101#ifdef CONFIG_MMU
100 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs 102 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
103#endif
101 mrc p15, 0, ip, c1, c0, 0 @ ctrl register 104 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
102 bic ip, ip, #0x000f @ ............wcam 105 bic ip, ip, #0x000f @ ............wcam
103 bic ip, ip, #0x1100 @ ...i...s........ 106 bic ip, ip, #0x1100 @ ...i...s........
@@ -317,6 +320,7 @@ ENTRY(cpu_arm920_dcache_clean_area)
317 */ 320 */
318 .align 5 321 .align 5
319ENTRY(cpu_arm920_switch_mm) 322ENTRY(cpu_arm920_switch_mm)
323#ifdef CONFIG_MMU
320 mov ip, #0 324 mov ip, #0
321#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH 325#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
322 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache 326 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
@@ -337,6 +341,7 @@ ENTRY(cpu_arm920_switch_mm)
337 mcr p15, 0, ip, c7, c10, 4 @ drain WB 341 mcr p15, 0, ip, c7, c10, 4 @ drain WB
338 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer 342 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
339 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs 343 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
344#endif
340 mov pc, lr 345 mov pc, lr
341 346
342/* 347/*
@@ -346,6 +351,7 @@ ENTRY(cpu_arm920_switch_mm)
346 */ 351 */
347 .align 5 352 .align 5
348ENTRY(cpu_arm920_set_pte) 353ENTRY(cpu_arm920_set_pte)
354#ifdef CONFIG_MMU
349 str r1, [r0], #-2048 @ linux version 355 str r1, [r0], #-2048 @ linux version
350 356
351 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY 357 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
@@ -372,6 +378,7 @@ ENTRY(cpu_arm920_set_pte)
372 mov r0, r0 378 mov r0, r0
373 mcr p15, 0, r0, c7, c10, 1 @ clean D entry 379 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
374 mcr p15, 0, r0, c7, c10, 4 @ drain WB 380 mcr p15, 0, r0, c7, c10, 4 @ drain WB
381#endif /* CONFIG_MMU */
375 mov pc, lr 382 mov pc, lr
376 383
377 __INIT 384 __INIT
@@ -381,7 +388,9 @@ __arm920_setup:
381 mov r0, #0 388 mov r0, #0
382 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4 389 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
383 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4 390 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
391#ifdef CONFIG_MMU
384 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 392 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
393#endif
385 mrc p15, 0, r0, c1, c0 @ get control register v4 394 mrc p15, 0, r0, c1, c0 @ get control register v4
386 ldr r5, arm920_cr1_clear 395 ldr r5, arm920_cr1_clear
387 bic r0, r0, r5 396 bic r0, r0, r5