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Diffstat (limited to 'board/amcc/luan/init.S')
| -rwxr-xr-x | board/amcc/luan/init.S | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/board/amcc/luan/init.S b/board/amcc/luan/init.S new file mode 100755 index 0000000..7830ebd --- /dev/null +++ b/board/amcc/luan/init.S @@ -0,0 +1,132 @@ +/* +* +* 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 + +#if (CFG_LARGE_FLASH == 0xffc00000) /* if booting from large flash */ + /* large flash */ + tlbentry( 0xffc00000, SZ_1M, 0xffc00000, 1, AC_R|AC_W|AC_X|SA_G|SA_I|SA_W ) + tlbentry( 0xffd00000, SZ_1M, 0xffd00000, 1, AC_R|AC_W|AC_X|SA_G|SA_I|SA_W ) + tlbentry( 0xffe00000, SZ_1M, 0xffe00000, 1, AC_R|AC_W|AC_X|SA_G|SA_I|SA_W ) + tlbentry( 0xfff00000, SZ_1M, 0xfff00000, 1, AC_R|AC_W|AC_X|SA_G|SA_I|SA_W ) + + tlbentry( 0xff800000, SZ_1M, 0xff800000, 1, AC_R|AC_W|AC_X|SA_G/*|SA_I*/ ) + tlbentry( 0xff900000, SZ_1M, 0xff900000, 1, AC_R|AC_W|AC_X|SA_G|SA_I|SA_W ) +#else /* else booting from small flash */ + tlbentry( 0xffe00000, SZ_1M, 0xffe00000, 1, AC_R|AC_W|AC_X|SA_G/*|SA_I*/ ) + tlbentry( 0xfff00000, SZ_1M, 0xfff00000, 1, AC_R|AC_W|AC_X|SA_G/*|SA_I*/ ) + + tlbentry( 0xff800000, SZ_1M, 0xff800000, 1, AC_R|AC_W|AC_X|SA_G/*|SA_I*/ ) + tlbentry( 0xff900000, SZ_1M, 0xff900000, 1, AC_R|AC_W|AC_X|SA_G/*|SA_I*/ ) + tlbentry( 0xffa00000, SZ_1M, 0xffa00000, 1, AC_R|AC_W|AC_X|SA_G/*|SA_I*/ ) + tlbentry( 0xffb00000, SZ_1M, 0xffb00000, 1, AC_R|AC_W|AC_X|SA_G/*|SA_I*/ ) +#endif + + tlbentry( CFG_EPLD_BASE, SZ_256K, 0xff000000, 1, AC_R|AC_W|SA_G|SA_I ) + +#if (CFG_SRAM_BASE != 0) /* if SRAM up high and SDRAM at zero */ + tlbentry( 0x00000000, SZ_256M, 0x00000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I ) + tlbentry( 0x10000000, SZ_256M, 0x10000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I ) +#elif (CFG_SMALL_FLASH == 0xff900000) /* else SRAM at 0 */ + tlbentry( 0x00000000, SZ_1M, 0xff800000, 1, AC_R|AC_W|AC_X|SA_G/*|SA_I*/ ) +#elif (CFG_SMALL_FLASH == 0xfff00000) + tlbentry( 0x00000000, SZ_1M, 0xffe00000, 1, AC_R|AC_W|AC_X|SA_G/*|SA_I*/ ) +#else + #error DONT KNOW SRAM LOCATION +#endif + + /* internal ram (l2 cache) */ + tlbentry( CFG_ISRAM_BASE, SZ_256K, 0x80000000, 0, AC_R|AC_W|AC_X|SA_I ) + + /* peripherals at f0000000 */ + tlbentry( CFG_PERIPHERAL_BASE, SZ_4K, CFG_PERIPHERAL_BASE, 1, AC_R|AC_W|SA_G|SA_I ) + + /* PCI */ +#if (CONFIG_COMMANDS & CFG_CMD_PCI) + tlbentry( CFG_PCI_BASE, SZ_256M, 0x00000000, 9, AC_R|AC_W|SA_G|SA_I ) + tlbentry( CFG_PCI_MEMBASE, SZ_256M, 0x10000000, 9, AC_R|AC_W|SA_G|SA_I ) +#endif + tlbtab_end |