/* * (C) Copyright 2005 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * 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 <config.h> #include <ppc_asm.tmpl> #include <ppc_defs.h> #include <asm/cache.h> #include <asm/mmu.h> #include "test_burst.h" .text /* * void mmu_init(void); * * This function turns the MMU on * * Three 8 MByte regions are mapped 1:1, uncached * - SDRAM lower 8 MByte * - SDRAM higher 8 MByte * - IMMR */ .global mmu_init mmu_init: tlbia /* Invalidate all TLB entries */ li r8, 0 mtspr MI_CTR, r8 /* Set instruction control to zero */ lis r8, MD_RESETVAL@h mtspr MD_CTR, r8 /* Set data TLB control */ /* Now map the lower 8 Meg into the TLBs. For this quick hack, * we can load the instruction and data TLB registers with the * same values. */ li r8, MI_EVALID /* Create EPN for address 0 */ mtspr MI_EPN, r8 mtspr MD_EPN, r8 li r8, MI_PS8MEG /* Set 8M byte page */ ori r8, r8, MI_SVALID /* Make it valid */ mtspr MI_TWC, r8 mtspr MD_TWC, r8 li r8, MI_BOOTINIT|0x2 /* Create RPN for address 0 */ mtspr MI_RPN, r8 /* Store TLB entry */ mtspr MD_RPN, r8 lis r8, MI_Kp@h /* Set the protection mode */ mtspr MI_AP, r8 mtspr MD_AP, r8 /* Now map the higher 8 Meg into the TLBs. For this quick hack, * we can load the instruction and data TLB registers with the * same values. */ lwz r9,20(r29) /* gd->ram_size */ addis r9,r9,-0x80 mr r8, r9 /* Higher 8 Meg in SDRAM */ ori r8, r8, MI_EVALID /* Mark page valid */ mtspr MI_EPN, r8 mtspr MD_EPN, r8 li r8, MI_PS8MEG /* Set 8M byte page */ ori r8, r8, MI_SVALID /* Make it valid */ mtspr MI_TWC, r8 mtspr MD_TWC, r8 mr r8, r9 ori r8, r8, MI_BOOTINIT|0x2 mtspr MI_RPN, r8 /* Store TLB entry */ mtspr MD_RPN, r8 lis r8, MI_Kp@h /* Set the protection mode */ mtspr MI_AP, r8 mtspr MD_AP, r8 /* Map another 8 MByte at the IMMR to get the processor * internal registers (among other things). */ mfspr r9, 638 /* Get current IMMR */ andis. r9, r9, 0xff80 /* Get 8Mbyte boundary */ mr r8, r9 /* Create vaddr for TLB */ ori r8, r8, MD_EVALID /* Mark it valid */ mtspr MD_EPN, r8 li r8, MD_PS8MEG /* Set 8M byte page */ ori r8, r8, MD_SVALID /* Make it valid */ mtspr MD_TWC, r8 mr r8, r9 /* Create paddr for TLB */ ori r8, r8, MI_BOOTINIT|0x2 /* Inhibit cache -- Cort */ mtspr MD_RPN, r8 /* We now have the lower and higher 8 Meg mapped into TLB entries, * and the caches ready to work. */ mfmsr r0 ori r0,r0,MSR_DR|MSR_IR mtspr SRR1,r0 mflr r0 mtspr SRR0,r0 SYNC rfi /* enables MMU */ /* * void caches_init(void); */ .globl caches_init caches_init: sync mfspr r3, IC_CST /* Clear error bits */ mfspr r3, DC_CST lis r3, IDC_UNALL@h /* Unlock all */ mtspr IC_CST, r3 mtspr DC_CST, r3 lis r3, IDC_INVALL@h /* Invalidate all */ mtspr IC_CST, r3 mtspr DC_CST, r3 lis r3, IDC_ENABLE@h /* Enable all */ mtspr IC_CST, r3 mtspr DC_CST, r3 blr /* * void flush_dcache_range(unsigned long start, unsigned long stop); */ .global flush_dcache_range flush_dcache_range: li r5,CACHE_LINE_SIZE-1 andc r3,r3,r5 subf r4,r3,r4 add r4,r4,r5 srwi. r4,r4,LG_CACHE_LINE_SIZE beqlr mtctr r4 1: dcbf 0,r3 addi r3,r3,CACHE_LINE_SIZE bdnz 1b sync /* wait for dcbf's to get to ram */ blr /* * void disable_interrupts(void); */ .global disable_interrupts disable_interrupts: mfmsr r0 rlwinm r0,r0,0,17,15 mtmsr r0 blr