mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-25 03:18:51 +09:00
![Scott Wood](/assets/img/avatar_default.png)
We cannot handle any exceptions while running in AS1, as the exceptions will transition back to AS0 without a valid mapping. Signed-off-by: Scott Wood <scottwood@freescale.com>
1131 lines
24 KiB
ArmAsm
1131 lines
24 KiB
ArmAsm
/*
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* Copyright 2004, 2007 Freescale Semiconductor.
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* Copyright (C) 2003 Motorola,Inc.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/* U-Boot Startup Code for Motorola 85xx PowerPC based Embedded Boards
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*
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* The processor starts at 0xfffffffc and the code is first executed in the
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* last 4K page(0xfffff000-0xffffffff) in flash/rom.
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*
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*/
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#include <config.h>
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#include <mpc85xx.h>
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#include <timestamp.h>
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#include <version.h>
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#define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
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#include <ppc_asm.tmpl>
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#include <ppc_defs.h>
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#include <asm/cache.h>
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#include <asm/mmu.h>
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#ifndef CONFIG_IDENT_STRING
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#define CONFIG_IDENT_STRING ""
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#endif
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#undef MSR_KERNEL
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#define MSR_KERNEL ( MSR_ME ) /* Machine Check */
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/*
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* Set up GOT: Global Offset Table
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*
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* Use r14 to access the GOT
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*/
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START_GOT
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GOT_ENTRY(_GOT2_TABLE_)
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GOT_ENTRY(_FIXUP_TABLE_)
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GOT_ENTRY(_start)
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GOT_ENTRY(_start_of_vectors)
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GOT_ENTRY(_end_of_vectors)
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GOT_ENTRY(transfer_to_handler)
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GOT_ENTRY(__init_end)
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GOT_ENTRY(_end)
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GOT_ENTRY(__bss_start)
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END_GOT
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/*
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* e500 Startup -- after reset only the last 4KB of the effective
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* address space is mapped in the MMU L2 TLB1 Entry0. The .bootpg
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* section is located at THIS LAST page and basically does three
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* things: clear some registers, set up exception tables and
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* add more TLB entries for 'larger spaces'(e.g. the boot rom) to
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* continue the boot procedure.
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* Once the boot rom is mapped by TLB entries we can proceed
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* with normal startup.
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*
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*/
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.section .bootpg,"ax"
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.globl _start_e500
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_start_e500:
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/* clear registers/arrays not reset by hardware */
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/* L1 */
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li r0,2
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mtspr L1CSR0,r0 /* invalidate d-cache */
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mtspr L1CSR1,r0 /* invalidate i-cache */
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mfspr r1,DBSR
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mtspr DBSR,r1 /* Clear all valid bits */
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/*
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* Enable L1 Caches early
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*
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*/
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lis r2,L1CSR0_CPE@H /* enable parity */
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ori r2,r2,L1CSR0_DCE
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mtspr L1CSR0,r2 /* enable L1 Dcache */
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isync
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mtspr L1CSR1,r2 /* enable L1 Icache */
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isync
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msync
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/* Setup interrupt vectors */
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lis r1,TEXT_BASE@h
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mtspr IVPR,r1
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li r1,0x0100
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mtspr IVOR0,r1 /* 0: Critical input */
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li r1,0x0200
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mtspr IVOR1,r1 /* 1: Machine check */
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li r1,0x0300
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mtspr IVOR2,r1 /* 2: Data storage */
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li r1,0x0400
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mtspr IVOR3,r1 /* 3: Instruction storage */
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li r1,0x0500
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mtspr IVOR4,r1 /* 4: External interrupt */
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li r1,0x0600
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mtspr IVOR5,r1 /* 5: Alignment */
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li r1,0x0700
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mtspr IVOR6,r1 /* 6: Program check */
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li r1,0x0800
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mtspr IVOR7,r1 /* 7: floating point unavailable */
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li r1,0x0900
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mtspr IVOR8,r1 /* 8: System call */
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/* 9: Auxiliary processor unavailable(unsupported) */
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li r1,0x0a00
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mtspr IVOR10,r1 /* 10: Decrementer */
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li r1,0x0b00
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mtspr IVOR11,r1 /* 11: Interval timer */
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li r1,0x0c00
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mtspr IVOR12,r1 /* 12: Watchdog timer */
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li r1,0x0d00
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mtspr IVOR13,r1 /* 13: Data TLB error */
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li r1,0x0e00
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mtspr IVOR14,r1 /* 14: Instruction TLB error */
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li r1,0x0f00
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mtspr IVOR15,r1 /* 15: Debug */
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/* Clear and set up some registers. */
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li r0,0x0000
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lis r1,0xffff
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mtspr DEC,r0 /* prevent dec exceptions */
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mttbl r0 /* prevent fit & wdt exceptions */
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mttbu r0
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mtspr TSR,r1 /* clear all timer exception status */
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mtspr TCR,r0 /* disable all */
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mtspr ESR,r0 /* clear exception syndrome register */
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mtspr MCSR,r0 /* machine check syndrome register */
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mtxer r0 /* clear integer exception register */
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/* Enable Time Base and Select Time Base Clock */
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lis r0,HID0_EMCP@h /* Enable machine check */
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#if defined(CONFIG_ENABLE_36BIT_PHYS)
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ori r0,r0,HID0_ENMAS7@l /* Enable MAS7 */
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#endif
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#ifndef CONFIG_E500MC
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ori r0,r0,HID0_TBEN@l /* Enable Timebase */
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#endif
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mtspr HID0,r0
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#ifndef CONFIG_E500MC
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li r0,(HID1_ASTME|HID1_ABE)@l /* Addr streaming & broadcast */
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mtspr HID1,r0
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#endif
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/* Enable Branch Prediction */
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#if defined(CONFIG_BTB)
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li r0,0x201 /* BBFI = 1, BPEN = 1 */
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mtspr BUCSR,r0
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#endif
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#if defined(CONFIG_SYS_INIT_DBCR)
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lis r1,0xffff
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ori r1,r1,0xffff
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mtspr DBSR,r1 /* Clear all status bits */
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lis r0,CONFIG_SYS_INIT_DBCR@h /* DBCR0[IDM] must be set */
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ori r0,r0,CONFIG_SYS_INIT_DBCR@l
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mtspr DBCR0,r0
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#endif
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#ifdef CONFIG_MPC8569
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#define CONFIG_SYS_LBC_ADDR (CONFIG_SYS_CCSRBAR_DEFAULT + 0x5000)
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#define CONFIG_SYS_LBCR_ADDR (CONFIG_SYS_LBC_ADDR + 0xd0)
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/* MPC8569 Rev.0 silcon needs to set bit 13 of LBCR to allow elBC to
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* use address space which is more than 12bits, and it must be done in
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* the 4K boot page. So we set this bit here.
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*/
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/* create a temp mapping TLB0[0] for LBCR */
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lis r6,FSL_BOOKE_MAS0(0, 0, 0)@h
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ori r6,r6,FSL_BOOKE_MAS0(0, 0, 0)@l
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lis r7,FSL_BOOKE_MAS1(1, 0, 0, 0, BOOKE_PAGESZ_4K)@h
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ori r7,r7,FSL_BOOKE_MAS1(1, 0, 0, 0, BOOKE_PAGESZ_4K)@l
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lis r8,FSL_BOOKE_MAS2(CONFIG_SYS_LBC_ADDR, MAS2_I|MAS2_G)@h
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ori r8,r8,FSL_BOOKE_MAS2(CONFIG_SYS_LBC_ADDR, MAS2_I|MAS2_G)@l
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lis r9,FSL_BOOKE_MAS3(CONFIG_SYS_LBC_ADDR, 0,
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(MAS3_SX|MAS3_SW|MAS3_SR))@h
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ori r9,r9,FSL_BOOKE_MAS3(CONFIG_SYS_LBC_ADDR, 0,
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(MAS3_SX|MAS3_SW|MAS3_SR))@l
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mtspr MAS0,r6
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mtspr MAS1,r7
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mtspr MAS2,r8
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mtspr MAS3,r9
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isync
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msync
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tlbwe
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/* Set LBCR register */
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lis r4,CONFIG_SYS_LBCR_ADDR@h
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ori r4,r4,CONFIG_SYS_LBCR_ADDR@l
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lis r5,CONFIG_SYS_LBC_LBCR@h
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ori r5,r5,CONFIG_SYS_LBC_LBCR@l
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stw r5,0(r4)
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isync
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/* invalidate this temp TLB */
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lis r4,CONFIG_SYS_LBC_ADDR@h
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ori r4,r4,CONFIG_SYS_LBC_ADDR@l
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tlbivax 0,r4
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isync
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#endif /* CONFIG_MPC8569 */
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/* create a temp mapping in AS=1 to the 4M boot window */
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lis r6,FSL_BOOKE_MAS0(1, 15, 0)@h
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ori r6,r6,FSL_BOOKE_MAS0(1, 15, 0)@l
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lis r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_4M)@h
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ori r7,r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_4M)@l
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lis r8,FSL_BOOKE_MAS2(TEXT_BASE & 0xffc00000, (MAS2_I|MAS2_G))@h
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ori r8,r8,FSL_BOOKE_MAS2(TEXT_BASE & 0xffc00000, (MAS2_I|MAS2_G))@l
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/* The 85xx has the default boot window 0xff800000 - 0xffffffff */
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lis r9,FSL_BOOKE_MAS3(0xffc00000, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@h
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ori r9,r9,FSL_BOOKE_MAS3(0xffc00000, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@l
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mtspr MAS0,r6
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mtspr MAS1,r7
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mtspr MAS2,r8
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mtspr MAS3,r9
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isync
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msync
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tlbwe
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/* create a temp mapping in AS=1 to the stack */
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lis r6,FSL_BOOKE_MAS0(1, 14, 0)@h
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ori r6,r6,FSL_BOOKE_MAS0(1, 14, 0)@l
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lis r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_16K)@h
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ori r7,r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_16K)@l
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lis r8,FSL_BOOKE_MAS2(CONFIG_SYS_INIT_RAM_ADDR, 0)@h
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ori r8,r8,FSL_BOOKE_MAS2(CONFIG_SYS_INIT_RAM_ADDR, 0)@l
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lis r9,FSL_BOOKE_MAS3(CONFIG_SYS_INIT_RAM_ADDR, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@h
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ori r9,r9,FSL_BOOKE_MAS3(CONFIG_SYS_INIT_RAM_ADDR, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@l
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mtspr MAS0,r6
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mtspr MAS1,r7
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mtspr MAS2,r8
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mtspr MAS3,r9
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isync
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msync
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tlbwe
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lis r6,MSR_IS|MSR_DS@h
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ori r6,r6,MSR_IS|MSR_DS@l
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lis r7,switch_as@h
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ori r7,r7,switch_as@l
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mtspr SPRN_SRR0,r7
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mtspr SPRN_SRR1,r6
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rfi
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switch_as:
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/* L1 DCache is used for initial RAM */
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/* Allocate Initial RAM in data cache.
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*/
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lis r3,CONFIG_SYS_INIT_RAM_ADDR@h
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ori r3,r3,CONFIG_SYS_INIT_RAM_ADDR@l
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mfspr r2, L1CFG0
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andi. r2, r2, 0x1ff
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/* cache size * 1024 / (2 * L1 line size) */
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slwi r2, r2, (10 - 1 - L1_CACHE_SHIFT)
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mtctr r2
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li r0,0
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1:
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dcbz r0,r3
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dcbtls 0,r0,r3
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addi r3,r3,CONFIG_SYS_CACHELINE_SIZE
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bdnz 1b
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/* Jump out the last 4K page and continue to 'normal' start */
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#ifdef CONFIG_SYS_RAMBOOT
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b _start_cont
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#else
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/* Calculate absolute address in FLASH and jump there */
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/*--------------------------------------------------------------*/
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lis r3,CONFIG_SYS_MONITOR_BASE@h
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ori r3,r3,CONFIG_SYS_MONITOR_BASE@l
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addi r3,r3,_start_cont - _start + _START_OFFSET
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mtlr r3
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blr
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#endif
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.text
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.globl _start
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_start:
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.long 0x27051956 /* U-BOOT Magic Number */
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.globl version_string
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version_string:
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.ascii U_BOOT_VERSION
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.ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
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.ascii CONFIG_IDENT_STRING, "\0"
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.align 4
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.globl _start_cont
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_start_cont:
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/* Setup the stack in initial RAM,could be L2-as-SRAM or L1 dcache*/
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lis r1,CONFIG_SYS_INIT_RAM_ADDR@h
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ori r1,r1,CONFIG_SYS_INIT_SP_OFFSET@l
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li r0,0
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stwu r0,-4(r1)
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stwu r0,-4(r1) /* Terminate call chain */
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stwu r1,-8(r1) /* Save back chain and move SP */
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lis r0,RESET_VECTOR@h /* Address of reset vector */
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ori r0,r0,RESET_VECTOR@l
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stwu r1,-8(r1) /* Save back chain and move SP */
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stw r0,+12(r1) /* Save return addr (underflow vect) */
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GET_GOT
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bl cpu_init_early_f
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/* switch back to AS = 0 */
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lis r3,(MSR_CE|MSR_ME|MSR_DE)@h
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ori r3,r3,(MSR_CE|MSR_ME|MSR_DE)@l
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mtmsr r3
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isync
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bl cpu_init_f
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bl board_init_f
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isync
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. = EXC_OFF_SYS_RESET
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.globl _start_of_vectors
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_start_of_vectors:
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/* Critical input. */
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CRIT_EXCEPTION(0x0100, CriticalInput, CritcalInputException)
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/* Machine check */
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MCK_EXCEPTION(0x200, MachineCheck, MachineCheckException)
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/* Data Storage exception. */
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STD_EXCEPTION(0x0300, DataStorage, UnknownException)
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/* Instruction Storage exception. */
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STD_EXCEPTION(0x0400, InstStorage, UnknownException)
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/* External Interrupt exception. */
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STD_EXCEPTION(0x0500, ExtInterrupt, ExtIntException)
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/* Alignment exception. */
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. = 0x0600
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Alignment:
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EXCEPTION_PROLOG(SRR0, SRR1)
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mfspr r4,DAR
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stw r4,_DAR(r21)
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mfspr r5,DSISR
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stw r5,_DSISR(r21)
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addi r3,r1,STACK_FRAME_OVERHEAD
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li r20,MSR_KERNEL
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rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
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lwz r6,GOT(transfer_to_handler)
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mtlr r6
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blrl
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.L_Alignment:
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.long AlignmentException - _start + _START_OFFSET
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.long int_return - _start + _START_OFFSET
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/* Program check exception */
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. = 0x0700
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ProgramCheck:
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EXCEPTION_PROLOG(SRR0, SRR1)
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addi r3,r1,STACK_FRAME_OVERHEAD
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li r20,MSR_KERNEL
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rlwimi r20,r23,0,16,16 /* copy EE bit from saved MSR */
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lwz r6,GOT(transfer_to_handler)
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mtlr r6
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blrl
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.L_ProgramCheck:
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.long ProgramCheckException - _start + _START_OFFSET
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.long int_return - _start + _START_OFFSET
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/* No FPU on MPC85xx. This exception is not supposed to happen.
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*/
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STD_EXCEPTION(0x0800, FPUnavailable, UnknownException)
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. = 0x0900
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/*
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* r0 - SYSCALL number
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* r3-... arguments
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*/
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SystemCall:
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addis r11,r0,0 /* get functions table addr */
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ori r11,r11,0 /* Note: this code is patched in trap_init */
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addis r12,r0,0 /* get number of functions */
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ori r12,r12,0
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cmplw 0,r0,r12
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bge 1f
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rlwinm r0,r0,2,0,31 /* fn_addr = fn_tbl[r0] */
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add r11,r11,r0
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lwz r11,0(r11)
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li r20,0xd00-4 /* Get stack pointer */
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lwz r12,0(r20)
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subi r12,r12,12 /* Adjust stack pointer */
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li r0,0xc00+_end_back-SystemCall
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cmplw 0,r0,r12 /* Check stack overflow */
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bgt 1f
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stw r12,0(r20)
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mflr r0
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stw r0,0(r12)
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mfspr r0,SRR0
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stw r0,4(r12)
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mfspr r0,SRR1
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stw r0,8(r12)
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li r12,0xc00+_back-SystemCall
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mtlr r12
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mtspr SRR0,r11
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1: SYNC
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rfi
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_back:
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mfmsr r11 /* Disable interrupts */
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li r12,0
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ori r12,r12,MSR_EE
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andc r11,r11,r12
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SYNC /* Some chip revs need this... */
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mtmsr r11
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SYNC
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li r12,0xd00-4 /* restore regs */
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lwz r12,0(r12)
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lwz r11,0(r12)
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mtlr r11
|
|
lwz r11,4(r12)
|
|
mtspr SRR0,r11
|
|
lwz r11,8(r12)
|
|
mtspr SRR1,r11
|
|
|
|
addi r12,r12,12 /* Adjust stack pointer */
|
|
li r20,0xd00-4
|
|
stw r12,0(r20)
|
|
|
|
SYNC
|
|
rfi
|
|
_end_back:
|
|
|
|
STD_EXCEPTION(0x0a00, Decrementer, timer_interrupt)
|
|
STD_EXCEPTION(0x0b00, IntervalTimer, UnknownException)
|
|
STD_EXCEPTION(0x0c00, WatchdogTimer, UnknownException)
|
|
|
|
STD_EXCEPTION(0x0d00, DataTLBError, UnknownException)
|
|
STD_EXCEPTION(0x0e00, InstructionTLBError, UnknownException)
|
|
|
|
CRIT_EXCEPTION(0x0f00, DebugBreakpoint, DebugException )
|
|
|
|
.globl _end_of_vectors
|
|
_end_of_vectors:
|
|
|
|
|
|
. = . + (0x100 - ( . & 0xff )) /* align for debug */
|
|
|
|
/*
|
|
* This code finishes saving the registers to the exception frame
|
|
* and jumps to the appropriate handler for the exception.
|
|
* Register r21 is pointer into trap frame, r1 has new stack pointer.
|
|
*/
|
|
.globl transfer_to_handler
|
|
transfer_to_handler:
|
|
stw r22,_NIP(r21)
|
|
lis r22,MSR_POW@h
|
|
andc r23,r23,r22
|
|
stw r23,_MSR(r21)
|
|
SAVE_GPR(7, r21)
|
|
SAVE_4GPRS(8, r21)
|
|
SAVE_8GPRS(12, r21)
|
|
SAVE_8GPRS(24, r21)
|
|
|
|
mflr r23
|
|
andi. r24,r23,0x3f00 /* get vector offset */
|
|
stw r24,TRAP(r21)
|
|
li r22,0
|
|
stw r22,RESULT(r21)
|
|
mtspr SPRG2,r22 /* r1 is now kernel sp */
|
|
|
|
lwz r24,0(r23) /* virtual address of handler */
|
|
lwz r23,4(r23) /* where to go when done */
|
|
mtspr SRR0,r24
|
|
mtspr SRR1,r20
|
|
mtlr r23
|
|
SYNC
|
|
rfi /* jump to handler, enable MMU */
|
|
|
|
int_return:
|
|
mfmsr r28 /* Disable interrupts */
|
|
li r4,0
|
|
ori r4,r4,MSR_EE
|
|
andc r28,r28,r4
|
|
SYNC /* Some chip revs need this... */
|
|
mtmsr r28
|
|
SYNC
|
|
lwz r2,_CTR(r1)
|
|
lwz r0,_LINK(r1)
|
|
mtctr r2
|
|
mtlr r0
|
|
lwz r2,_XER(r1)
|
|
lwz r0,_CCR(r1)
|
|
mtspr XER,r2
|
|
mtcrf 0xFF,r0
|
|
REST_10GPRS(3, r1)
|
|
REST_10GPRS(13, r1)
|
|
REST_8GPRS(23, r1)
|
|
REST_GPR(31, r1)
|
|
lwz r2,_NIP(r1) /* Restore environment */
|
|
lwz r0,_MSR(r1)
|
|
mtspr SRR0,r2
|
|
mtspr SRR1,r0
|
|
lwz r0,GPR0(r1)
|
|
lwz r2,GPR2(r1)
|
|
lwz r1,GPR1(r1)
|
|
SYNC
|
|
rfi
|
|
|
|
crit_return:
|
|
mfmsr r28 /* Disable interrupts */
|
|
li r4,0
|
|
ori r4,r4,MSR_EE
|
|
andc r28,r28,r4
|
|
SYNC /* Some chip revs need this... */
|
|
mtmsr r28
|
|
SYNC
|
|
lwz r2,_CTR(r1)
|
|
lwz r0,_LINK(r1)
|
|
mtctr r2
|
|
mtlr r0
|
|
lwz r2,_XER(r1)
|
|
lwz r0,_CCR(r1)
|
|
mtspr XER,r2
|
|
mtcrf 0xFF,r0
|
|
REST_10GPRS(3, r1)
|
|
REST_10GPRS(13, r1)
|
|
REST_8GPRS(23, r1)
|
|
REST_GPR(31, r1)
|
|
lwz r2,_NIP(r1) /* Restore environment */
|
|
lwz r0,_MSR(r1)
|
|
mtspr SPRN_CSRR0,r2
|
|
mtspr SPRN_CSRR1,r0
|
|
lwz r0,GPR0(r1)
|
|
lwz r2,GPR2(r1)
|
|
lwz r1,GPR1(r1)
|
|
SYNC
|
|
rfci
|
|
|
|
mck_return:
|
|
mfmsr r28 /* Disable interrupts */
|
|
li r4,0
|
|
ori r4,r4,MSR_EE
|
|
andc r28,r28,r4
|
|
SYNC /* Some chip revs need this... */
|
|
mtmsr r28
|
|
SYNC
|
|
lwz r2,_CTR(r1)
|
|
lwz r0,_LINK(r1)
|
|
mtctr r2
|
|
mtlr r0
|
|
lwz r2,_XER(r1)
|
|
lwz r0,_CCR(r1)
|
|
mtspr XER,r2
|
|
mtcrf 0xFF,r0
|
|
REST_10GPRS(3, r1)
|
|
REST_10GPRS(13, r1)
|
|
REST_8GPRS(23, r1)
|
|
REST_GPR(31, r1)
|
|
lwz r2,_NIP(r1) /* Restore environment */
|
|
lwz r0,_MSR(r1)
|
|
mtspr SPRN_MCSRR0,r2
|
|
mtspr SPRN_MCSRR1,r0
|
|
lwz r0,GPR0(r1)
|
|
lwz r2,GPR2(r1)
|
|
lwz r1,GPR1(r1)
|
|
SYNC
|
|
rfmci
|
|
|
|
/* Cache functions.
|
|
*/
|
|
.globl invalidate_icache
|
|
invalidate_icache:
|
|
mfspr r0,L1CSR1
|
|
ori r0,r0,L1CSR1_ICFI
|
|
msync
|
|
isync
|
|
mtspr L1CSR1,r0
|
|
isync
|
|
blr /* entire I cache */
|
|
|
|
.globl invalidate_dcache
|
|
invalidate_dcache:
|
|
mfspr r0,L1CSR0
|
|
ori r0,r0,L1CSR0_DCFI
|
|
msync
|
|
isync
|
|
mtspr L1CSR0,r0
|
|
isync
|
|
blr
|
|
|
|
.globl icache_enable
|
|
icache_enable:
|
|
mflr r8
|
|
bl invalidate_icache
|
|
mtlr r8
|
|
isync
|
|
mfspr r4,L1CSR1
|
|
ori r4,r4,0x0001
|
|
oris r4,r4,0x0001
|
|
mtspr L1CSR1,r4
|
|
isync
|
|
blr
|
|
|
|
.globl icache_disable
|
|
icache_disable:
|
|
mfspr r0,L1CSR1
|
|
lis r3,0
|
|
ori r3,r3,L1CSR1_ICE
|
|
andc r0,r0,r3
|
|
mtspr L1CSR1,r0
|
|
isync
|
|
blr
|
|
|
|
.globl icache_status
|
|
icache_status:
|
|
mfspr r3,L1CSR1
|
|
andi. r3,r3,L1CSR1_ICE
|
|
blr
|
|
|
|
.globl dcache_enable
|
|
dcache_enable:
|
|
mflr r8
|
|
bl invalidate_dcache
|
|
mtlr r8
|
|
isync
|
|
mfspr r0,L1CSR0
|
|
ori r0,r0,0x0001
|
|
oris r0,r0,0x0001
|
|
msync
|
|
isync
|
|
mtspr L1CSR0,r0
|
|
isync
|
|
blr
|
|
|
|
.globl dcache_disable
|
|
dcache_disable:
|
|
mfspr r3,L1CSR0
|
|
lis r4,0
|
|
ori r4,r4,L1CSR0_DCE
|
|
andc r3,r3,r4
|
|
mtspr L1CSR0,r0
|
|
isync
|
|
blr
|
|
|
|
.globl dcache_status
|
|
dcache_status:
|
|
mfspr r3,L1CSR0
|
|
andi. r3,r3,L1CSR0_DCE
|
|
blr
|
|
|
|
.globl get_pir
|
|
get_pir:
|
|
mfspr r3,PIR
|
|
blr
|
|
|
|
.globl get_pvr
|
|
get_pvr:
|
|
mfspr r3,PVR
|
|
blr
|
|
|
|
.globl get_svr
|
|
get_svr:
|
|
mfspr r3,SVR
|
|
blr
|
|
|
|
.globl wr_tcr
|
|
wr_tcr:
|
|
mtspr TCR,r3
|
|
blr
|
|
|
|
/*------------------------------------------------------------------------------- */
|
|
/* Function: in8 */
|
|
/* Description: Input 8 bits */
|
|
/*------------------------------------------------------------------------------- */
|
|
.globl in8
|
|
in8:
|
|
lbz r3,0x0000(r3)
|
|
blr
|
|
|
|
/*------------------------------------------------------------------------------- */
|
|
/* Function: out8 */
|
|
/* Description: Output 8 bits */
|
|
/*------------------------------------------------------------------------------- */
|
|
.globl out8
|
|
out8:
|
|
stb r4,0x0000(r3)
|
|
sync
|
|
blr
|
|
|
|
/*------------------------------------------------------------------------------- */
|
|
/* Function: out16 */
|
|
/* Description: Output 16 bits */
|
|
/*------------------------------------------------------------------------------- */
|
|
.globl out16
|
|
out16:
|
|
sth r4,0x0000(r3)
|
|
sync
|
|
blr
|
|
|
|
/*------------------------------------------------------------------------------- */
|
|
/* Function: out16r */
|
|
/* Description: Byte reverse and output 16 bits */
|
|
/*------------------------------------------------------------------------------- */
|
|
.globl out16r
|
|
out16r:
|
|
sthbrx r4,r0,r3
|
|
sync
|
|
blr
|
|
|
|
/*------------------------------------------------------------------------------- */
|
|
/* Function: out32 */
|
|
/* Description: Output 32 bits */
|
|
/*------------------------------------------------------------------------------- */
|
|
.globl out32
|
|
out32:
|
|
stw r4,0x0000(r3)
|
|
sync
|
|
blr
|
|
|
|
/*------------------------------------------------------------------------------- */
|
|
/* Function: out32r */
|
|
/* Description: Byte reverse and output 32 bits */
|
|
/*------------------------------------------------------------------------------- */
|
|
.globl out32r
|
|
out32r:
|
|
stwbrx r4,r0,r3
|
|
sync
|
|
blr
|
|
|
|
/*------------------------------------------------------------------------------- */
|
|
/* Function: in16 */
|
|
/* Description: Input 16 bits */
|
|
/*------------------------------------------------------------------------------- */
|
|
.globl in16
|
|
in16:
|
|
lhz r3,0x0000(r3)
|
|
blr
|
|
|
|
/*------------------------------------------------------------------------------- */
|
|
/* Function: in16r */
|
|
/* Description: Input 16 bits and byte reverse */
|
|
/*------------------------------------------------------------------------------- */
|
|
.globl in16r
|
|
in16r:
|
|
lhbrx r3,r0,r3
|
|
blr
|
|
|
|
/*------------------------------------------------------------------------------- */
|
|
/* Function: in32 */
|
|
/* Description: Input 32 bits */
|
|
/*------------------------------------------------------------------------------- */
|
|
.globl in32
|
|
in32:
|
|
lwz 3,0x0000(3)
|
|
blr
|
|
|
|
/*------------------------------------------------------------------------------- */
|
|
/* Function: in32r */
|
|
/* Description: Input 32 bits and byte reverse */
|
|
/*------------------------------------------------------------------------------- */
|
|
.globl in32r
|
|
in32r:
|
|
lwbrx r3,r0,r3
|
|
blr
|
|
|
|
/*------------------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* void relocate_code (addr_sp, gd, addr_moni)
|
|
*
|
|
* This "function" does not return, instead it continues in RAM
|
|
* after relocating the monitor code.
|
|
*
|
|
* r3 = dest
|
|
* r4 = src
|
|
* r5 = length in bytes
|
|
* r6 = cachelinesize
|
|
*/
|
|
.globl relocate_code
|
|
relocate_code:
|
|
mr r1,r3 /* Set new stack pointer */
|
|
mr r9,r4 /* Save copy of Init Data pointer */
|
|
mr r10,r5 /* Save copy of Destination Address */
|
|
|
|
mr r3,r5 /* Destination Address */
|
|
lis r4,CONFIG_SYS_MONITOR_BASE@h /* Source Address */
|
|
ori r4,r4,CONFIG_SYS_MONITOR_BASE@l
|
|
lwz r5,GOT(__init_end)
|
|
sub r5,r5,r4
|
|
li r6,CONFIG_SYS_CACHELINE_SIZE /* Cache Line Size */
|
|
|
|
/*
|
|
* Fix GOT pointer:
|
|
*
|
|
* New GOT-PTR = (old GOT-PTR - CONFIG_SYS_MONITOR_BASE) + Destination Address
|
|
*
|
|
* Offset:
|
|
*/
|
|
sub r15,r10,r4
|
|
|
|
/* First our own GOT */
|
|
add r14,r14,r15
|
|
/* the the one used by the C code */
|
|
add r30,r30,r15
|
|
|
|
/*
|
|
* Now relocate code
|
|
*/
|
|
|
|
cmplw cr1,r3,r4
|
|
addi r0,r5,3
|
|
srwi. r0,r0,2
|
|
beq cr1,4f /* In place copy is not necessary */
|
|
beq 7f /* Protect against 0 count */
|
|
mtctr r0
|
|
bge cr1,2f
|
|
|
|
la r8,-4(r4)
|
|
la r7,-4(r3)
|
|
1: lwzu r0,4(r8)
|
|
stwu r0,4(r7)
|
|
bdnz 1b
|
|
b 4f
|
|
|
|
2: slwi r0,r0,2
|
|
add r8,r4,r0
|
|
add r7,r3,r0
|
|
3: lwzu r0,-4(r8)
|
|
stwu r0,-4(r7)
|
|
bdnz 3b
|
|
|
|
/*
|
|
* Now flush the cache: note that we must start from a cache aligned
|
|
* address. Otherwise we might miss one cache line.
|
|
*/
|
|
4: cmpwi r6,0
|
|
add r5,r3,r5
|
|
beq 7f /* Always flush prefetch queue in any case */
|
|
subi r0,r6,1
|
|
andc r3,r3,r0
|
|
mr r4,r3
|
|
5: dcbst 0,r4
|
|
add r4,r4,r6
|
|
cmplw r4,r5
|
|
blt 5b
|
|
sync /* Wait for all dcbst to complete on bus */
|
|
mr r4,r3
|
|
6: icbi 0,r4
|
|
add r4,r4,r6
|
|
cmplw r4,r5
|
|
blt 6b
|
|
7: sync /* Wait for all icbi to complete on bus */
|
|
isync
|
|
|
|
/*
|
|
* Re-point the IVPR at RAM
|
|
*/
|
|
mtspr IVPR,r10
|
|
|
|
/*
|
|
* We are done. Do not return, instead branch to second part of board
|
|
* initialization, now running from RAM.
|
|
*/
|
|
|
|
addi r0,r10,in_ram - _start + _START_OFFSET
|
|
mtlr r0
|
|
blr /* NEVER RETURNS! */
|
|
.globl in_ram
|
|
in_ram:
|
|
|
|
/*
|
|
* Relocation Function, r14 point to got2+0x8000
|
|
*
|
|
* Adjust got2 pointers, no need to check for 0, this code
|
|
* already puts a few entries in the table.
|
|
*/
|
|
li r0,__got2_entries@sectoff@l
|
|
la r3,GOT(_GOT2_TABLE_)
|
|
lwz r11,GOT(_GOT2_TABLE_)
|
|
mtctr r0
|
|
sub r11,r3,r11
|
|
addi r3,r3,-4
|
|
1: lwzu r0,4(r3)
|
|
add r0,r0,r11
|
|
stw r0,0(r3)
|
|
bdnz 1b
|
|
|
|
/*
|
|
* Now adjust the fixups and the pointers to the fixups
|
|
* in case we need to move ourselves again.
|
|
*/
|
|
2: li r0,__fixup_entries@sectoff@l
|
|
lwz r3,GOT(_FIXUP_TABLE_)
|
|
cmpwi r0,0
|
|
mtctr r0
|
|
addi r3,r3,-4
|
|
beq 4f
|
|
3: lwzu r4,4(r3)
|
|
lwzux r0,r4,r11
|
|
add r0,r0,r11
|
|
stw r10,0(r3)
|
|
stw r0,0(r4)
|
|
bdnz 3b
|
|
4:
|
|
clear_bss:
|
|
/*
|
|
* Now clear BSS segment
|
|
*/
|
|
lwz r3,GOT(__bss_start)
|
|
lwz r4,GOT(_end)
|
|
|
|
cmplw 0,r3,r4
|
|
beq 6f
|
|
|
|
li r0,0
|
|
5:
|
|
stw r0,0(r3)
|
|
addi r3,r3,4
|
|
cmplw 0,r3,r4
|
|
bne 5b
|
|
6:
|
|
|
|
mr r3,r9 /* Init Data pointer */
|
|
mr r4,r10 /* Destination Address */
|
|
bl board_init_r
|
|
|
|
/*
|
|
* Copy exception vector code to low memory
|
|
*
|
|
* r3: dest_addr
|
|
* r7: source address, r8: end address, r9: target address
|
|
*/
|
|
.globl trap_init
|
|
trap_init:
|
|
lwz r7,GOT(_start_of_vectors)
|
|
lwz r8,GOT(_end_of_vectors)
|
|
|
|
li r9,0x100 /* reset vector always at 0x100 */
|
|
|
|
cmplw 0,r7,r8
|
|
bgelr /* return if r7>=r8 - just in case */
|
|
|
|
mflr r4 /* save link register */
|
|
1:
|
|
lwz r0,0(r7)
|
|
stw r0,0(r9)
|
|
addi r7,r7,4
|
|
addi r9,r9,4
|
|
cmplw 0,r7,r8
|
|
bne 1b
|
|
|
|
/*
|
|
* relocate `hdlr' and `int_return' entries
|
|
*/
|
|
li r7,.L_CriticalInput - _start + _START_OFFSET
|
|
bl trap_reloc
|
|
li r7,.L_MachineCheck - _start + _START_OFFSET
|
|
bl trap_reloc
|
|
li r7,.L_DataStorage - _start + _START_OFFSET
|
|
bl trap_reloc
|
|
li r7,.L_InstStorage - _start + _START_OFFSET
|
|
bl trap_reloc
|
|
li r7,.L_ExtInterrupt - _start + _START_OFFSET
|
|
bl trap_reloc
|
|
li r7,.L_Alignment - _start + _START_OFFSET
|
|
bl trap_reloc
|
|
li r7,.L_ProgramCheck - _start + _START_OFFSET
|
|
bl trap_reloc
|
|
li r7,.L_FPUnavailable - _start + _START_OFFSET
|
|
bl trap_reloc
|
|
li r7,.L_Decrementer - _start + _START_OFFSET
|
|
bl trap_reloc
|
|
li r7,.L_IntervalTimer - _start + _START_OFFSET
|
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li r8,_end_of_vectors - _start + _START_OFFSET
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2:
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bl trap_reloc
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addi r7,r7,0x100 /* next exception vector */
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cmplw 0,r7,r8
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blt 2b
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|
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|
lis r7,0x0
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|
mtspr IVPR,r7
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|
|
|
mtlr r4 /* restore link register */
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|
blr
|
|
|
|
/*
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|
* Function: relocate entries for one exception vector
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|
*/
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trap_reloc:
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lwz r0,0(r7) /* hdlr ... */
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add r0,r0,r3 /* ... += dest_addr */
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stw r0,0(r7)
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|
|
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lwz r0,4(r7) /* int_return ... */
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add r0,r0,r3 /* ... += dest_addr */
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stw r0,4(r7)
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|
|
|
blr
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|
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.globl unlock_ram_in_cache
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|
unlock_ram_in_cache:
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/* invalidate the INIT_RAM section */
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|
lis r3,(CONFIG_SYS_INIT_RAM_ADDR & ~(CONFIG_SYS_CACHELINE_SIZE-1))@h
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|
ori r3,r3,(CONFIG_SYS_INIT_RAM_ADDR & ~(CONFIG_SYS_CACHELINE_SIZE-1))@l
|
|
mfspr r4,L1CFG0
|
|
andi. r4,r4,0x1ff
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|
slwi r4,r4,(10 - 1 - L1_CACHE_SHIFT)
|
|
mtctr r4
|
|
1: dcbi r0,r3
|
|
addi r3,r3,CONFIG_SYS_CACHELINE_SIZE
|
|
bdnz 1b
|
|
sync
|
|
|
|
/* Invalidate the TLB entries for the cache */
|
|
lis r3,CONFIG_SYS_INIT_RAM_ADDR@h
|
|
ori r3,r3,CONFIG_SYS_INIT_RAM_ADDR@l
|
|
tlbivax 0,r3
|
|
addi r3,r3,0x1000
|
|
tlbivax 0,r3
|
|
addi r3,r3,0x1000
|
|
tlbivax 0,r3
|
|
addi r3,r3,0x1000
|
|
tlbivax 0,r3
|
|
isync
|
|
blr
|
|
|
|
.globl flush_dcache
|
|
flush_dcache:
|
|
mfspr r3,SPRN_L1CFG0
|
|
|
|
rlwinm r5,r3,9,3 /* Extract cache block size */
|
|
twlgti r5,1 /* Only 32 and 64 byte cache blocks
|
|
* are currently defined.
|
|
*/
|
|
li r4,32
|
|
subfic r6,r5,2 /* r6 = log2(1KiB / cache block size) -
|
|
* log2(number of ways)
|
|
*/
|
|
slw r5,r4,r5 /* r5 = cache block size */
|
|
|
|
rlwinm r7,r3,0,0xff /* Extract number of KiB in the cache */
|
|
mulli r7,r7,13 /* An 8-way cache will require 13
|
|
* loads per set.
|
|
*/
|
|
slw r7,r7,r6
|
|
|
|
/* save off HID0 and set DCFA */
|
|
mfspr r8,SPRN_HID0
|
|
ori r9,r8,HID0_DCFA@l
|
|
mtspr SPRN_HID0,r9
|
|
isync
|
|
|
|
lis r4,0
|
|
mtctr r7
|
|
|
|
1: lwz r3,0(r4) /* Load... */
|
|
add r4,r4,r5
|
|
bdnz 1b
|
|
|
|
msync
|
|
lis r4,0
|
|
mtctr r7
|
|
|
|
1: dcbf 0,r4 /* ...and flush. */
|
|
add r4,r4,r5
|
|
bdnz 1b
|
|
|
|
/* restore HID0 */
|
|
mtspr SPRN_HID0,r8
|
|
isync
|
|
|
|
blr
|
|
|
|
.globl setup_ivors
|
|
setup_ivors:
|
|
|
|
#include "fixed_ivor.S"
|
|
blr
|