From mboxrd@z Thu Jan 1 00:00:00 1970 From: gerg@snapgear.com (Greg Ungerer) Date: Wed, 6 Oct 2010 15:09:29 +1000 Subject: [PATCH 01/10] ARM: no need for nommu to jump through the hoops that mmu does In-Reply-To: References: Message-ID: <4CAC0489.90201@snapgear.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 05/10/10 03:09, Russell King - ARM Linux wrote: > nommu can jump directly to __mmap_switched without the absolute > address branching which the mmuful kernel does. > > Signed-off-by: Russell King Acked-by: Greg Ungerer > arch/arm/kernel/head-nommu.S | 5 +---- > 1 files changed, 1 insertions(+), 4 deletions(-) > > diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S > index 573b803..814ce1a 100644 > --- a/arch/arm/kernel/head-nommu.S > +++ b/arch/arm/kernel/head-nommu.S > @@ -48,8 +48,6 @@ ENTRY(stext) > movs r8, r5 @ invalid machine (r5=0)? > beq __error_a @ yes, error 'a' > > - ldr r13, __switch_data @ address to jump to after > - @ the initialization is done > adr lr, BSYM(__after_proc_init) @ return (PIC) address > ARM( add pc, r10, #PROCINFO_INITFUNC ) > THUMB( add r12, r10, #PROCINFO_INITFUNC ) > @@ -87,8 +85,7 @@ __after_proc_init: > mcr p15, 0, r0, c1, c0, 0 @ write control reg > #endif /* CONFIG_CPU_CP15 */ > > - mov r3, r13 > - mov pc, r3 @ clear the BSS and jump > + b __mmap_switched @ clear the BSS and jump > @ to start_kernel > ENDPROC(__after_proc_init) > .ltorg -- ------------------------------------------------------------------------ Greg Ungerer -- Principal Engineer EMAIL: gerg at snapgear.com SnapGear Group, McAfee PHONE: +61 7 3435 2888 8 Gardner Close FAX: +61 7 3217 5323 Milton, QLD, 4064, Australia WEB: http://www.SnapGear.com