board/xpedite1k/init.S

/*
* Copyright (C) 2002 Scott McNutt <smcnutt@artesyncp.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/

#include <ppc_asm.tmpl>
#include <config.h>

/* General */
#define TLB_VALID	0x00000200

/* Supported page sizes */
#define SZ_1K		0x00000000
#define SZ_4K		0x00000010
#define SZ_16K		0x00000020
#define SZ_64K		0x00000030
#define SZ_256K		0x00000040
#define SZ_1M		0x00000050
#define SZ_16M		0x00000070
#define SZ_256M		0x00000090

/* Storage attributes */
#define SA_W		0x00000800	/* Write-through */
#define SA_I		0x00000400	/* Caching inhibited */
#define SA_M		0x00000200	/* Memory coherence */
#define SA_G		0x00000100	/* Guarded */
#define SA_E		0x00000080	/* Endian */

/* Access control */
#define AC_X		0x00000024	/* Execute */
#define AC_W		0x00000012	/* Write */
#define AC_R		0x00000009	/* Read */

/* Some handy macros */
#define EPN(e)		((e) & 0xfffffc00)
#define TLB0(epn,sz)	((EPN((epn)) | (sz) | TLB_VALID ))
#define TLB1(rpn,erpn)	(((rpn)&0xfffffc00) | (erpn))
#define TLB2(a)		((a)&0x00000fbf)

#define tlbtab_start	\
	mflr	r1;	\
	bl 0f;

#define tlbtab_end	\
	.long 0, 0, 0;	\
0:	mflr	r0;	\
	mtlr	r1;	\
	blr;

#define tlbentry(epn,sz,rpn,erpn,attr)\
	.long TLB0(epn,sz),TLB1(rpn,erpn),TLB2(attr)


/*
 * TLB TABLE
 *
 * This table is used by the cpu boot code to setup the initial tlb
 * entries. Rather than make broad assumptions in the cpu source tree,
 * this table lets each board set things up however they like.
 *
 * Pointer to the table is returned in r1
 */

	.section .bootpg,"ax"
	.globl tlbtab

tlbtab:
	tlbtab_start
	tlbentry( 0xf0000000, SZ_256M, 0xf0000000, 1, AC_R|AC_W|AC_X|SA_G|SA_I)
	tlbentry( CONFIG_SYS_PERIPHERAL_BASE, SZ_256M, 0x40000000, 1, AC_R|AC_W|SA_G|SA_I)
	tlbentry( CONFIG_SYS_ISRAM_BASE, SZ_256K, 0x80000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I)
	tlbentry( CONFIG_SYS_SDRAM_BASE, SZ_256M, 0x00000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I )
	tlbentry( CONFIG_SYS_SDRAM_BASE+0x10000000, SZ_256M, 0x10000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I )
	tlbentry( CONFIG_SYS_PCI_BASE, SZ_256M, 0x00000000, 2, AC_R|AC_W|SA_G|SA_I )
	tlbentry( CONFIG_SYS_PCI_MEMBASE, SZ_256M, 0x00000000, 3, AC_R|AC_W|SA_G|SA_I )
	tlbtab_end