/* $NetBSD: locore.S,v 1.27 2021/02/26 02:18:55 thorpej Exp $ */ /* * Copyright (C) 1995, 1996 Wolfgang Solfrank. * Copyright (C) 1995, 1996 TooLs GmbH. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by TooLs GmbH. * 4. The name of TooLs GmbH may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * Amiga part written by Adam Ciarcinski. * Rewritten for 4.0 and bootargs support by Frank Wille. */ #include "opt_ddb.h" #include "opt_lockdebug.h" #include "opt_multiprocessor.h" #include "opt_ppcparam.h" #include "assym.h" #include "ksyms.h" #include <sys/syscall.h> #include <machine/param.h> #include <machine/psl.h> #include <machine/trap.h> #include <machine/asm.h> #include <powerpc/spr.h> #include <powerpc/oea/spr.h> #include <powerpc/oea/hid.h> #include <amiga/amiga/custom.h> #include <amigappc/amigappc/p5reg.h> /* * Some instructions gas doesn't understand (yet?) */ #define bdneq bdnzf 2, /* * Globals */ .data GLOBAL(startsym) .long 0 /* start symbol table */ GLOBAL(endsym) .long 0 /* end symbol table */ GLOBAL(eclockfreq) .long 0 /* needed by the aucc driver only */ /* * This symbol is here for the benefit of kvm_mkdb, and is supposed to * mark the start of kernel text. */ .text .globl _C_LABEL(kernel_text) _C_LABEL(kernel_text): /* * Startup entry * This is where bootloader jumps after successful kernel loading. * Must be the first address in text segment * * Registers passed from bootloader: * r20: E-clock frequency * r21: kernel length in bytes (including ksyms, configdevs and memlists) * r22: entry (__start) * r23: fastmem start * r24: fastmem size * r25: chipmem size * r26: boothowto * r27: esym offset * r28: machine id << 16 * r29: amiga flags * r30: inhibit sync flags * r31: kernel base (__start) */ .globl __start __start: /* * Disable FPU/MMU exceptions and set interrupt prefix for a * high-vector configuration (exception vectors at 0xfff00000). * Also make sure caches are disabled (should be). */ li 0,PSL_IP mtmsr 0 isync /* * Disable M68k * First of all we must disable M68k, since it cannot be done by * the loader (which is run under M68k). */ lis 5,P5BASE@h /* ori 5,5,P5BASE@l - we assume that the lsb is 0x0000 */ li 9,P5_M68K_RESET stb 9,P5_REG_RESET(5) sync /* * Disable Amiga interrupts and DMA */ lis 7,0xbfd000@h ori 7,7,0xbfd000@l li 8,0x7f stb 8,0xd00(7) /* CIAB icr */ stb 8,0x1d01(7) /* CIAA icr */ sync lis 7,0xdff000@h ori 7,7,0xdff000@l li 8,0x7fff sth 8,0x9a(7) /* INTENA */ sth 8,0x9c(7) /* INTREQ */ sth 8,0x96(7) /* DMACON */ sync /* * Change interrupt master * Only one CPU can get Amiga interrupts, either M68k or PowerPC. */ li 0,P5_SET_CLEAR|0x7f stb 0,P5_INT_LVL(5) sync li 9,P5_INT_MASTER|P5_ENABLE_IPL stb 9,P5_REG_INT(5) /* PPC is master CPU */ sync li 8,P5_DISABLE_INT stb 8,P5_IPL_EMU(5) /* enable interrupts */ sync li 7,P5_SET_CLEAR|7 stb 7,P5_IPL_EMU(5) /* all levels */ sync /* * Compute start and end of kernel memory */ lis 6,_C_LABEL(end)+3@ha addi 6,6,_C_LABEL(end)+3@l rlwinm 7,6,0,0,29 /* startsym = end - 32-bit alignment */ #if NKSYMS || defined(DDB) || defined(MODULAR) lis 8,_C_LABEL(startsym)@ha stw 7,_C_LABEL(startsym)@l(8) mr. 27,27 /* esym == 0 ? */ bne 1f sub 27,7,31 /* esym = startsym : no ksyms! */ 1: add 7,31,27 /* endsym = kernel_base + esym */ lis 9,_C_LABEL(endsym)@ha stw 7,_C_LABEL(endsym)@l(9) /* end of symbol table */ #endif add 4,31,21 /* kernel-end including configdevs */ INIT_CPUINFO(4,1,9,0) mr 14,4 /* * Pass boot arguments */ lis 11,_C_LABEL(eclockfreq)@ha stw 20,_C_LABEL(eclockfreq)@l(11) mr 3,26 /* boothowto */ mr 4,23 /* fphystart */ mr 5,24 /* fphysize */ mr 6,25 /* cphysize */ /* esym, already in r7 */ mr 8,28 /* machine id << 16 */ mr 9,29 /* amigaflags */ mr 10,30 /* inhibitsync */ bl _C_LABEL(set_boot_args) mr 3,31 mr 4,14 bl _C_LABEL(initppc) /* * Enable and invalidate the L1 caches. * First the I-caches, then the D-caches. Otherwise the system hangs!!! */ mfspr 8,SPR_HID0 ori 8,8,HID0_ICE ori 9,8,HID0_ICFI sync mtspr SPR_HID0,9 mtspr SPR_HID0,8 sync isync ori 8,8,HID0_DCE ori 9,8,HID0_DCFI sync mtspr SPR_HID0,9 mtspr SPR_HID0,8 sync /* * Disable serial instr. execution and enable the branch history table for 604 */ mfpvr 3 rlwinm 3,3,16,16,31 /* CPU revision */ cmpwi %r3,9 /* 604e? */ bne 1f mfspr 7,SPR_HID0 ori 7,7,HID0_SGE|HID0_BHT ori 6,7,HID0_BTCD sync mtspr SPR_HID0,6 /* flush the BTAC */ sync mtspr SPR_HID0,7 sync isync 1: /* * You are standing at the gate to NetBSD. --More-- * Unspeakable cruelty and harm lurk down there. --More-- * Are you sure you want to enter? */ bl _C_LABEL(main) /* So be it */ loop: b loop /* not reached */ /* * Pull in common switch / setfault code. */ #include <powerpc/powerpc/locore_subr.S> /* * Pull in common trap vector code. */ #include <powerpc/powerpc/trap_subr.S> /* * Pull in common pio / bus_space code. */ #include <powerpc/powerpc/pio_subr.S>
