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ARMv7: Enable the SWP instruction

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The SWP instruction has been deprecated starting with the ARMv6
architecture. On ARMv7 processors with the multiprocessor extensions
(like Cortex-A9), this instruction is disabled by default but it can be
enabled by setting bit 10 in the System Control register. Note that
setting this bit is safe even if the ARMv7 processor has the SWP
instruction enabled by default.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas 2009-05-30 14:00:16 +01:00
parent d71e1352e2
commit 213fb2a8ee
1 changed files with 4 additions and 4 deletions
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8
arch/arm/mm/proc-v7.S
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@ -232,14 +232,14 @@ __v7_setup:
ENDPROC(__v7_setup)
/* AT
* TFR EV X F I D LR
* .EEE ..EE PUI. .T.T 4RVI ZFRS BLDP WCAM
* TFR EV X F I D LR S
* .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM
* rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
* 1 0 110 0011 1.00 .111 1101 < we want
* 1 0 110 0011 1100 .111 1101 < we want
*/
.type v7_crval, #object
v7_crval:
crval clear=0x0120c302, mmuset=0x10c0387d, ucset=0x00c0187c
crval clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c
__v7_setup_stack:
.space 4 * 11 @ 11 registers