linux-kernel - [RFC 17/23] ARM: add machine desc hook for early memory/paging initialization

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Date:	Mon, 23 Jul 2012 21:09:19 -0400
From:	Cyril Chemparathy <cyril@...com>
To:	<linux-arm-kernel@...ts.infradead.org>
CC:	<linux-kernel@...r.kernel.org>, <nico@...aro.org>,
	<will.deacon@....com>, <catalin.marinas@....com>,
	Cyril Chemparathy <cyril@...com>,
	Vitaly Andrianov <vitalya@...com>
Subject: [RFC 17/23] ARM: add machine desc hook for early memory/paging initialization

This patch adds a machine descriptor hook that gives control to machine
specific code prior to memory and paging initialization.

On Keystone platforms, this hook is used to switch the PHYS_OFFSET over
to the "real" non-32-bit-addressable address range.

Signed-off-by: Cyril Chemparathy <cyril@...com>
Signed-off-by: Vitaly Andrianov <vitalya@...com>
---
 arch/arm/include/asm/mach/arch.h |    1 +
 arch/arm/kernel/setup.c          |    3 +++
 2 files changed, 4 insertions(+)

diff --git a/arch/arm/include/asm/mach/arch.h b/arch/arm/include/asm/mach/arch.h
index 0b1c94b..49e9c2a 100644
--- a/arch/arm/include/asm/mach/arch.h
+++ b/arch/arm/include/asm/mach/arch.h
@@ -39,6 +39,7 @@ struct machine_desc {
 					 struct meminfo *);
 	void			(*reserve)(void);/* reserve mem blocks	*/
 	void			(*map_io)(void);/* IO mapping function	*/
+	void			(*init_meminfo)(void);
 	void			(*init_early)(void);
 	void			(*init_irq)(void);
 	struct sys_timer	*timer;		/* system tick timer	*/
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index e15d83b..7cbe292 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -964,6 +964,9 @@ void __init setup_arch(char **cmdline_p)
 
 	parse_early_param();
 
+	if (mdesc->init_meminfo)
+		mdesc->init_meminfo();
+
 	sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
 	sanity_check_meminfo();
 	arm_memblock_init(&meminfo, mdesc);
-- 
1.7.9.5

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