diff options
| author | Hyok S. Choi <hyok.choi@samsung.com> | 2006-06-28 15:10:01 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-06-28 18:59:56 +0200 |
| commit | d090dddaba7c8da6401bb259340dce05ca32f564 (patch) | |
| tree | c35d9e22dc09d40144b4a672962269ff60c9ad07 /arch/arm/mm/proc-arm1022.S | |
| parent | [ARM] nommu: prevent Xscale-based machines being selected (diff) | |
| download | linux-d090dddaba7c8da6401bb259340dce05ca32f564.tar.xz linux-d090dddaba7c8da6401bb259340dce05ca32f564.zip | |
[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-arm1022.S')
| -rw-r--r-- | arch/arm/mm/proc-arm1022.S | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-arm1022.S b/arch/arm/mm/proc-arm1022.S index f778545d57a2..b0ccff4fadd2 100644 --- a/arch/arm/mm/proc-arm1022.S +++ b/arch/arm/mm/proc-arm1022.S @@ -3,6 +3,7 @@ * * Copyright (C) 2000 ARM Limited * Copyright (C) 2000 Deep Blue Solutions Ltd. + * hacked for non-paged-MM by Hyok S. Choi, 2003. * * 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 @@ -90,7 +91,9 @@ ENTRY(cpu_arm1022_reset) mov ip, #0 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches mcr p15, 0, ip, c7, c10, 4 @ drain WB +#ifdef CONFIG_MMU mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs +#endif mrc p15, 0, ip, c1, c0, 0 @ ctrl register bic ip, ip, #0x000f @ ............wcam bic ip, ip, #0x1100 @ ...i...s........ @@ -333,6 +336,7 @@ ENTRY(cpu_arm1022_dcache_clean_area) */ .align 5 ENTRY(cpu_arm1022_switch_mm) +#ifdef CONFIG_MMU #ifndef CONFIG_CPU_DCACHE_DISABLE mov r1, #(CACHE_DSEGMENTS - 1) << 5 @ 16 segments 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries @@ -349,6 +353,7 @@ ENTRY(cpu_arm1022_switch_mm) 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 +#endif mov pc, lr /* @@ -358,6 +363,7 @@ ENTRY(cpu_arm1022_switch_mm) */ .align 5 ENTRY(cpu_arm1022_set_pte) +#ifdef CONFIG_MMU str r1, [r0], #-2048 @ linux version eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY @@ -385,6 +391,7 @@ ENTRY(cpu_arm1022_set_pte) #ifndef CONFIG_CPU_DCACHE_DISABLE mcr p15, 0, r0, c7, c10, 1 @ clean D entry #endif +#endif /* CONFIG_MMU */ mov pc, lr __INIT @@ -394,7 +401,9 @@ __arm1022_setup: mov r0, #0 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4 +#ifdef CONFIG_MMU mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4 +#endif mrc p15, 0, r0, c1, c0 @ get control register v4 ldr r5, arm1022_cr1_clear bic r0, r0, r5 |