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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2006-06-29 18:24:21 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-06-29 18:24:21 +0100 |
| commit | 8799ee9f49f6171fd58f4d64f8c067ca49006a5d (patch) | |
| tree | b746b8800bc99633f31505d151624c8ccd75cd47 /arch/arm/mm/proc-arm6_7.S | |
| parent | 326764a85b7676388db3ebad6488f312631d7661 (diff) | |
| download | kernel_samsung_smdk4412-8799ee9f49f6171fd58f4d64f8c067ca49006a5d.zip kernel_samsung_smdk4412-8799ee9f49f6171fd58f4d64f8c067ca49006a5d.tar.gz kernel_samsung_smdk4412-8799ee9f49f6171fd58f4d64f8c067ca49006a5d.tar.bz2 | |
[ARM] Set bit 4 on section mappings correctly depending on CPU
On some CPUs, bit 4 of section mappings means "update the
cache when written to". On others, this bit is required to
be one, and others it's required to be zero. Finally, on
ARMv6 and above, setting it turns on "no execute" and prevents
speculative prefetches.
With all these combinations, no one value fits all CPUs, so we
have to pick a value depending on the CPU type, and the area
we're mapping.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/proc-arm6_7.S')
| -rw-r--r-- | arch/arm/mm/proc-arm6_7.S | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-arm6_7.S b/arch/arm/mm/proc-arm6_7.S index 7a705ed..0432e48 100644 --- a/arch/arm/mm/proc-arm6_7.S +++ b/arch/arm/mm/proc-arm6_7.S @@ -355,6 +355,10 @@ __arm6_proc_info: .long 0x41560600 .long 0xfffffff0 .long 0x00000c1e + .long PMD_TYPE_SECT | \ + PMD_BIT4 | \ + PMD_SECT_AP_WRITE | \ + PMD_SECT_AP_READ b __arm6_setup .long cpu_arch_name .long cpu_elf_name @@ -371,6 +375,10 @@ __arm610_proc_info: .long 0x41560610 .long 0xfffffff0 .long 0x00000c1e + .long PMD_TYPE_SECT | \ + PMD_BIT4 | \ + PMD_SECT_AP_WRITE | \ + PMD_SECT_AP_READ b __arm6_setup .long cpu_arch_name .long cpu_elf_name @@ -387,6 +395,10 @@ __arm7_proc_info: .long 0x41007000 .long 0xffffff00 .long 0x00000c1e + .long PMD_TYPE_SECT | \ + PMD_BIT4 | \ + PMD_SECT_AP_WRITE | \ + PMD_SECT_AP_READ b __arm7_setup .long cpu_arch_name .long cpu_elf_name @@ -408,6 +420,10 @@ __arm710_proc_info: PMD_BIT4 | \ PMD_SECT_AP_WRITE | \ PMD_SECT_AP_READ + .long PMD_TYPE_SECT | \ + PMD_BIT4 | \ + PMD_SECT_AP_WRITE | \ + PMD_SECT_AP_READ b __arm7_setup .long cpu_arch_name .long cpu_elf_name |