linux-kernel - Re: [PATCH 19/27] score: create kernel files asm-offsets.c entry.S head.S

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Date:	Tue, 9 Jun 2009 21:18:26 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	liqin.chen@...plusct.com
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH 19/27] score: create kernel files asm-offsets.c entry.S head.S

> new file mode 100644
> index 0000000..a7432c1
> --- /dev/null
> +++ b/arch/score/kernel/head.S
> @@ -0,0 +1,70 @@
> +/*
> + * arch/score/kernel/head.S
> + *
> + * Score Processor version.
> + *
> + * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
> + *  Chen Liqin <liqin.chen@...plusct.com>
> + *  Lennox Wu <lennox.wu@...plusct.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see the file COPYING, or write
> + * to the Free Software Foundation, Inc.,
> + * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
> + */
> +
> +#include <asm/asm-offsets.h>
> +
> +       .extern start_kernel
> +       .global init_thread_union
> +       .global kernelsp
> +
> +       .section .init.text, "ax"

Please use section definitions from include/linux/init.h.
__INIT in this case.

Other architectures uses __HEAD so they have full control
on where to add this code in the final image.


> +       .align  2;
> +       .globl  _stext;
> +_stext:

Usually a linker defined symbol?

> +       la      r30, __bss_start        /* initialize BSS segment. */
> +       la      r31, _end
> +       xor     r8, r8, r8
> +
> +1:     cmp.c   r31, r30
> +       beq     2f
> +
> +       sw      r8, [r30]               /* clean memory. */
> +       addi    r30, 4
> +       b       1b
> +
> +2:     la      r28, init_thread_union  /* set kernel stack. */
> +       mv      r0, r28
> +       addi    r0, KERNEL_STACK_SIZE - 32
> +       la      r30, kernelsp
> +       sw      r0, [r30]
> +       subi    r0, 4*4
> +       xor     r30, r30, r30
> +       ori     r30, 0x02               /* enable MMU. */
> +       mtcr    r30, cr4
> +       nop
> +       nop
> +       nop
> +       nop
> +       nop
> +       nop
> +       nop
> +
> +       /* there is no parameter */
> +       xor     r4, r4, r4
> +       xor     r5, r5, r5
> +       xor     r6, r6, r6
> +       xor     r7, r7, r7
> +       la      r30, start_kernel       /* jump to init_arch */
> +       br      r30

	Sam
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