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| author | Vladimir Murzin <vladimir.murzin@arm.com> | 2018-04-03 11:37:47 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2018-05-19 12:53:46 +0200 |
| commit | 22893aa22b3cc89f12e1f80585c399f392f0a27a (patch) | |
| tree | 08c9c49d2630911cc32165576da3ee533cf57a1d /arch/arm/kernel | |
| parent | ARM: 8754/1: NOMMU: Move PMSAv7 MPU under it's own namespace (diff) | |
| download | linux-22893aa22b3cc89f12e1f80585c399f392f0a27a.tar.xz linux-22893aa22b3cc89f12e1f80585c399f392f0a27a.zip | |
ARM: 8755/1: NOMMU: Reorganise __setup_mpu
Currently, we have mixed code placement between .head.text and .text
depends on configuration we are building:
_text M R(UP) R(SMP)
======================================================
__setup_mpu __HEAD __HEAD text
__after_proc_init __HEAD __HEAD text
__mmap_switched text text text
We are going to support another variant of MPU which is different to
PMSAv7 in sense overlapping MPU regions are not allowed, so this patch
makes boundaries between these sections precise and consistent:
_text M R(UP) R(SMP)
======================================================
__setup_mpu __HEAD __HEAD __HEAD
__after_proc_init text text text
__mmap_switched text text text
Additionally, it paves a path to postpone MPU activation till
__after_proc_init where we do set SCTLR anyway and can return
directly to __mmap_switched.
Tested-by: Szemz? András <sza@esh.hu>
Tested-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/head-nommu.S | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S index d5d5fc8b581c..e294c0aa1e36 100644 --- a/arch/arm/kernel/head-nommu.S +++ b/arch/arm/kernel/head-nommu.S @@ -75,8 +75,8 @@ ENTRY(stext) ldr r12, [r10, #PROCINFO_INITFUNC] add r12, r12, r10 ret r12 -1: bl __after_proc_init - b __mmap_switched +1: ldr lr, =__mmap_switched + b __after_proc_init ENDPROC(stext) #ifdef CONFIG_SMP @@ -123,6 +123,7 @@ __secondary_data: /* * Set the Control Register and Read the process ID. */ + .text __after_proc_init: #ifdef CONFIG_CPU_CP15 /* @@ -202,6 +203,7 @@ ENDPROC(__after_proc_init) * * r6: Value to be written to DRSR (and IRSR if required) for PMSAv7_RAM_REGION */ + __HEAD ENTRY(__setup_mpu) @@ -301,6 +303,7 @@ ENDPROC(__setup_pmsa_v7) * r6: pointer at mpu_rgn_info */ + .text ENTRY(__secondary_setup_mpu) /* Use MPU region info supplied by __cpu_up */ ldr r6, [r7] @ get secondary_data.mpu_rgn_info |